JP2010047880A - Apparatus and method for producing filament yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method by which a filament yarn having excellent quality, in particular such as strength and elongation or elongation or strength, uniformity such as yarn thickness unevenness or quality unevenness, and grade such as fluff is produced with good productivity and general-purpose properties. <P>SOLUTION: The apparatus for producing the filament yarn includes at least a spinneret for spinning a molten thermoplastic polymer as the filament yarn and a cooling means provided with an air stream blowing surface having a circular cross-sectional shape in the direction perpendicular to the running path direction of the filament yarn, surrounding the running path of the filament yarn from the outer peripheral side, blowing an air stream inward from the outer peripheral side of the running path of the filament yarn, and cooling the filament yarn. In the apparatus for producing the filament yarn, the cross-sectional shape of the air stream blowing surface in the direction perpendicular to the running path direction of the filament yarn in the cooling means is disposed so as to gradually reduce from the upstream side to the downstream side in the running path direction of the filament yarn. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filament yarn manufacturing apparatus and manufacturing method.

  Filament yarns composed of thermoplastic polymers such as polyester and polyamide are generally melt-spun, that is, a spinneret equipped with a spin pack and a molten thermoplastic polymer supplied to a spin pack disposed in a spin block. After spinning as filament yarn, cooling and solidifying with air current etc., bundling and applying oil agent etc. were performed as necessary, once taken up with a roller etc., further stretched and heat treated etc. with a heating roller etc. if necessary After that, it is manufactured through a process such as winding. The above-described drawing, heat treatment, and the like may be performed when the filament yarn spun from the spinneret is cooled and solidified by an air current or the like and then passed through a heating tube or the like. It may be performed in a process. In some cases, the filament yarn spun from the spinneret is allowed to pass through a heating cylinder or the like and gradually cooled, and then cooled and solidified by an air current or the like. In addition, cooling of the filament yarn is generally performed by blowing an air flow from the cooling means to the filament yarn, and a flat air flow blowing surface is provided to blow a one-way air flow to the filament yarn spun from the circular spinneret. Cooling means (hereinafter referred to as the “uniflo cooling means”) for cooling by cooling, and the discharge holes for spinning each filament yarn are arranged circumferentially around the spinneret center. Further, a cylindrical airflow blowing surface is provided to cool the filament yarn by blowing an airflow outward from the inner peripheral side of the filament yarn traveling path or inward from the outer peripheral side of the filament yarn traveling path. Cooling means (hereinafter referred to as cooling means for cooling the filament yarn by blowing an air flow outward from the inner peripheral side of the filament yarn traveling path is referred to as an outer blown cylindrical cooling. Means, by blowing an air flow will be referred to as the inner blown cylindrical cooling means a cooling means for cooling the filament yarn), and the like inwardly from the outer peripheral side of the travel path of the filament yarn. In the Uniflo cooling means, among the single yarns of the filament yarn, the single yarn on the side close to the air flow blowing surface is sufficiently cooled, but the single yarn on the far side is not sufficiently cooled, and cooling is performed for each filament yarn. Although it is difficult to uniformly apply to a single yarn, especially when multifilaments are used, there are problems such as occurrence of cooling spots and yarn shaking, and the thickness of the yarn is extremely deteriorated. In the blown cylindrical cooling means and the inner blown cylindrical cooling means, the filament yarn can be cooled over the entire circumference with the airflow from the inner or outer peripheral side of the filament yarn travel path, so that each filament yarn can be uniformly distributed. It is considered that this is a cooling means that can be easily cooled and can be expected to suppress cooling spots and yarn wobbling. Further, according to the knowledge of the present inventors, in particular, the inner blown cylindrical cooling means has an air flow blown out from the cylindrical air flow blowing surface in the filament yarn traveling path with respect to the outer blown cylindrical cooling means. Since it is easy to increase the speed by shrinking the flow path toward the circumferential side, the cooling capacity is relatively high, and the versatility for dealing with various types is excellent. In addition, since the airflow blowing surface is disposed on the outer peripheral side of the filament yarn traveling path, the filament yarn is not easily affected by the disturbance of the field atmosphere. Therefore, according to the knowledge of the present inventors, the inner blow cylindrical cooling means is considered to be a cooling means with high potential that is excellent in uniform cooling, cooling capacity, versatility, and the like. In this specification, solidification refers to a state in which the filament yarn composed of a thermoplastic polymer and each single yarn thereof are below the glass transition temperature.

  To describe the behavior of the filament yarn from spinning to solidification in more detail, each filament yarn spun from the spinneret is cooled by heat exchange between each filament and the airflow around each filament. The cross-section in the direction perpendicular to the running direction of each single yarn until solidification occurs due to the action and the action of tension, etc. based on the friction between each single yarn and the airflow around each single yarn. Continue to increase the running speed while reducing the area. In addition, since an air flow is often used for the airflow used for cooling the filament yarn, the resistance based on the friction between each single yarn and the airflow around each single yarn is hereinafter referred to as air resistance. And

  Here, the tension acting on each single yarn of the filament yarn from spinning until it is almost solidified is obtained by dividing by the cross-sectional area of the cross section in the direction perpendicular to the running direction of each single yarn at the position where the filament yarn is almost solidified. It is generally known that there is a close correlation between the generated stress and the birefringence, which is a representative value of the degree of molecular orientation of each single yarn of the filament yarn. That is, when this stress increases, the degree of molecular orientation of each single yarn of the filament yarn increases, and the strength and elongation obtained by multiplying the strength and elongation of the filament yarn that has been spun, temporarily solidified, and taken off, etc. On the contrary, when this stress is reduced, the degree of molecular orientation of each single yarn of the filament yarn is suppressed to a low level, and the strength and elongation of the filament yarn that has been spun, solidified, and taken off are multiplied. It is known that the combined strength, particularly the quality such as elongation, tends to be high.

  When the filament yarn that has been spun and solidified and taken off has a low strength, elongation, etc., the filament yarn tends to have a low strength as a whole. Quality such as strong elongation, elongation, and strength of the filament yarn after drawing tends to be low. That is, if the filament yarn that has been spun and solidified and pulled down has a low strength or elongation, the filament yarn after drawing is reduced in order to maintain a high elongation of the filament yarn after drawing. It becomes difficult to obtain sufficient strength, and conversely, if the draw ratio is increased for the purpose of maintaining high strength of the filament yarn after drawing, it is difficult to obtain sufficient elongation in the drawn filament yarn. For this reason, when the strength, elongation, etc. of the filament yarn that has been spun and once solidified and taken down become low, the filament yarn itself as well as the robustness of high-order processed products such as textiles produced from the filament yarn, etc. There is a problem that gets worse. In addition, fluff and yarn breakage are likely to occur, and there is a problem that productivity of a manufacturing process of a high-order processed product is deteriorated as well as a manufacturing process of a filament yarn.

  In order to suppress this stress, many proposals have been made from various viewpoints. One of the most important proposals is a method of suppressing stress by suppressing the air resistance acting on each single yarn of the filament yarn and suppressing the increase in tension due to the air resistance. In addition, according to the knowledge of the present inventors, in the field of melt spinning, there is a background that the spinning speed has been actively promoted especially for the purpose of improving productivity. Greatly increases with increasing speed, with the aim of suppressing the decrease in elongation, strength, etc., or maintaining the same level of strength, elongation, strength, etc. even when the speed is increased. I think there is a background that attracted attention to the air resistance. Here, the spinning speed indicates a yarn speed when the filament yarn is solidified for the first time after being spun from the spinneret, or a yarn speed when the filament yarn is first taken up by a roller or the like.

  As a proposal using this method, for example, the proposal of Patent Document 1 can be cited. In Patent Document 1, a filament composed of a thermoplastic polymer in a path from a heated thermoplastic polymer (melt polymer) in a spinneret (spinning nozzle) to a roll driven at a surface speed of at least 500 m / min. A melt spinning method for spinning a yarn (a continuous filament of a polymer), wherein an air flow (cooling gas) is introduced into a melted filament yarn (melted filament) immediately after being discharged in a region under the spinneret, and the filament yarn And air flow from the region together through a tubular portion of a limited size surrounding the filament yarn as the filament yarn cools, and the uppermost portion of the tubular portion is more than 80 cm below the spinneret surface. Placed at a short distance, the size and position of the tubular part and the amount of airflow (gas) is the speed of the filament yarn, although the airflow is accelerated Ri to exit from the tubular portion at a low speed, such as a controlled manner has been proposed. Further, FIG. 2 in Patent Document 1 shows a schematic elevation view of a partial cross section in an embodiment of an apparatus for practicing the method proposed in Patent Document 1, and only the outline of this figure is shown. The cylindrical airflow blowing surface (cylindrical quench screen system) that introduces airflow (pressurized cooling gas) into the area below the spinneret that discharges the filament yarn, and the lower part of the cylindrical airflow blowing surface FIG. 1 is a diagram in which a tubular portion having a short inner diameter equal to a cylindrical airflow blowing surface, a tapered portion, and a tubular portion having a narrower inner diameter are sequentially arranged. In addition, in the description of Patent Document 1, the wording in Patent Document 1 is added in parentheses for reference, but in the following description of Patent Document 1, it is written in words outside the parentheses. That is, a spinning nozzle as a spinneret, a molten polymer as a thermoplastic polymer, a continuous filament of polymer as a filament yarn composed of a thermoplastic polymer, a cooling gas or gas or pressurized cooling gas as an air stream, and a filament obtained by melting a molten filament The yarn and filament are referred to as a filament yarn, and the cylindrical quench screen system is referred to as a cylindrical airflow blowing surface. Further, in Patent Document 1, the airflow introduced from the cylindrical airflow blowing surface exits from the region of the cylindrical airflow blowing surface below the spinneret, so that the cylindrical airflow blowing surface below the spinneret There is a statement that it must enter a tubular section with a smaller cross-sectional area than the region and must be accelerated as it enters and passes through the tubular section. According to the knowledge of the present inventors, by accelerating the airflow in this way, the relative speed between the filament yarn and the airflow is reduced, the air resistance acting on the filament yarn, and the tension due to the air resistance It is considered that the aim is to suppress the increase and to suppress the decrease in elongation, etc., which tends to occur as the spinning speed increases. Further, in Patent Document 1, since the airflow introduced from the cylindrical airflow blowing surface exits from the area of the cylindrical airflow blowing surface below the spinneret, the area of the cylindrical airflow blowing surface below the spinneret Must enter a tubular section with a smaller cross-sectional area and is accelerated as it enters and passes through the tubular section, forcing it to enter the inside, i.e., inside, of each single yarn array comprising the filament yarn, thereby There is also a description that the cooling effect of the airflow on the filament yarn is improved.

  However, according to the knowledge of the present inventors, the proposal of Patent Document 1 has the following problems. First, from the illustration of FIG. 2 in Patent Document 1, the filament yarn travels as the filament yarn converges toward the drawing roll in the region where the cylindrical airflow blowing surface is disposed. Since the distance between the filament yarn in the direction perpendicular to the path direction and the cylindrical airflow blowing surface is arranged so as to gradually increase from the upstream side to the downstream side in the traveling path direction of the filament yarn, In the region where the cylindrical airflow blowing surface is disposed, the airflow around each single yarn of the filament yarn is introduced from the cylindrical airflow blowing surface from the upstream side to the downstream side in the traveling direction of the filament yarn. It becomes difficult to be rectified gradually by the airflow, and the airflow introduced from the airflow blowing surface inside the array of single yarns constituting the filament yarn is difficult to enter gradually. Becomes, cooled plaques inside and outside of the sequence of each single yarn constituting the filament yarn is liable problem occurs. Therefore, first, in the area of the cylindrical airflow blowing surface, the uniformity of the yarn thickness variation and quality unevenness of the filament yarn is deteriorated due to yarn fluctuations or cooling spots due to airflow turbulence, etc. There is a problem that the quality such as strength and elongation of the filament yarn is deteriorated due to defects. As described above, the airflow introduced from the cylindrical airflow blowing surface gradually increases from the upstream side to the downstream side in the traveling path direction of the filament yarn, inside the arrangement of the single yarns constituting the filament yarn. Therefore, most of the airflow introduced from the airflow blowing surface accordingly does not penetrate inside the array of single yarns constituting the filament yarn, and gradually gradually, especially with respect to the single yarn inside the filament yarn array. The cylindrical air flow is gradually disturbed by the influence of the filament yarn and flow path resistance from the upstream side to the downstream side in the traveling direction of the filament yarn without contributing to the cooling of the filament yarn. From the area of the surface, it flows into the tubular part having a short inner diameter, a tapered part and a tubular part having a small cross-sectional area equal to the cylindrical air blowing face.

  Secondly, from the region of the cylindrical airflow blowing surface to the region of the tubular portion having a short inner diameter and a tapered portion equal to the cylindrical airflow blowing surface, and the tubular portion having a small cross-sectional area, as described above. The airflow that flows in the turbulent state is further turbulent under the influence of the flow resistance of the tubular part with a short inner diameter equal to the cylindrical airflow blowing surface, the tapered part, the tubular part with a small cross-sectional area, etc. However, there is a problem that it is more likely to be disturbed. In addition, in a tapered portion or a tubular portion having a small cross-sectional area, the air current is forced to enter the inside of each single yarn constituting the filament yarn in the turbulent state as described above. There is a problem that large yarn swings easily occur. Therefore, in the region of the tubular portion having a short inner diameter equal to the cylindrical airflow blowing surface and the tapered portion and the tubular portion having a small cross-sectional area, the airflow is greatly turbulent, and a large yarn swaying occurs. There is a problem that the uniformity of the thread thickness unevenness greatly deteriorates.

  Further, according to the knowledge of the present inventors, Patent Document 1 aims to suppress the stress by suppressing the air resistance acting on each single yarn of the filament yarn until solidification and suppressing the increase in tension due to the air resistance. Therefore, solidification of each single yarn of the filament yarn is performed or performed in a tapered portion where the airflow introduced from the cylindrical airflow blowing surface is greatly accelerated, a tubular portion having a small cross-sectional area, or the like. Probably intended. This is because when each single yarn of the filament yarn is solidified on the upstream side in the traveling direction of the filament yarn from the tapered portion or the tubular portion having a small sectional area, the tapered portion or the tubular portion having a small sectional area is solidified. This is because it is difficult to sufficiently suppress the air resistance acting until solidification due to the greatly accelerated airflow. Patent Document 1 describes that the filament yarn is preferably already cured before exiting the tubular section having a small cross-sectional area. For this reason, filament yarn in an unsolidified molten state is exposed to large air current turbulence and large yarn sway as described above in a tapered portion or a tubular portion having a small cross-sectional area, and the filament yarn is simply The yarn and the single yarn may be in contact with each other in the molten state, or the single yarn in the molten state may come into contact with the wall surface such as a tapered portion or a tubular portion having a small cross-sectional area. It becomes a defect, the quality of the filament yarn such as strength and elongation is greatly reduced, fluff is generated and the quality of the filament yarn is deteriorated, or the yarn breakage occurs and the productivity is deteriorated. There is also a problem. In addition, large yarn swaying at a tapered portion or a tubular section with a small cross-sectional area is also propagated to the filament yarn traveling in the region of the cylindrical airflow blowing surface upstream in the traveling direction of the filament yarn. In the filament yarn that travels in the region of the cylindrical airflow blowing surface that is in a molten state at a higher temperature than the filament yarn that travels in a tapered portion or a tubular section having a small cross-sectional area, similarly, between the single yarns There is also a problem that the quality such as the filament yarn strength and the elongation greatly deteriorates due to the occurrence of contact. According to the knowledge of the present inventors, the problem of the contact of the single yarn in the melted state is that the arrangement of the single yarns constituting the filament yarn in the region of the cylindrical airflow blowing surface as described above. The airflow introduced from the cylindrical airflow blowing surface gradually becomes difficult to enter inside, and in particular, the single yarn inside the array of single yarns constituting the filament yarn is difficult to be cooled by the airflow introduced from the airflow blowing surface. The cooling of the filament yarn in the region of the tubular portion having a short inner diameter equal to that of the cylindrical airflow blowing surface, the tapered portion, and the tubular portion having a small cross-sectional area is more effective in the traveling direction of the filament yarn than this region. It is thought that it is also promoted by the fact that it is introduced by the air flow that has already been introduced from the upstream cylindrical air flow blowing surface and heat exchange with the filament yarn has started. That.

  Therefore, according to the knowledge of the present inventors, in the proposal of Patent Document 1, problems such as those described above, for example, large air current turbulence and large yarn swaying occur, and so on. There is a problem that the uniformity of the yarn deteriorates and the quality of the filament yarn such as strength and elongation decreases due to contact of the melted single yarn.

  Further, in Patent Document 2, FIG. 1 in Patent Document 2 shows a diagram having substantially the same configuration as FIG. 2 in Patent Document 1 according to the knowledge of the present inventors. That is, according to the knowledge of the present inventors, in FIG. 1 in Patent Document 2, the outline of the spinneret for discharging the filament yarn (yarn) is shown downstream in the traveling path direction of the filament yarn. FIG. 1 illustrates a drawing in which a heating cylinder, a heat insulating plate, a cylindrical airflow blowing surface (blowout port), a guide cylinder, and a reduced diameter portion are arranged in this order from the upstream side to the downstream side in the traveling path direction of the filament yarn. Further, in this figure, the guide cylinder is illustrated in a shape in which the upstream side in the traveling path direction of the filament yarn has an inner diameter substantially equal to the cylindrical airflow blowing surface, and the downstream side is reduced in a tapered shape. Yes. In the description of Patent Document 2, the wording in Patent Document 1 is added in parentheses for reference, but in the following description of Patent Document 2, it is written in words outside the parentheses. As described above, from the illustration of FIG. 1 in Patent Document 2, according to the knowledge of the present inventors, the guide tube referred to in Patent Document 2 is equal to the cylindrical airflow blowing surface referred to in Patent Document 1. It is considered that the portion where the tubular portion having a short inner diameter and the tapered portion are combined, and the reduced diameter portion referred to in Patent Document 2 corresponds to the tubular portion having a small cross-sectional area referred to in Patent Document 1, and in this respect, the patent The configuration of FIG. 1 in Document 2 and the configuration of FIG. 2 in Patent Document 1 are considered to be substantially the same. Further, according to the knowledge of the present inventors, Patent Document 2 does not include a clear mechanism regarding air resistance, but as described above, the configuration of FIG. 1 in Patent Document 2 and Patent Document 1 Since the configuration of FIG. 2 is considered to be almost the same, it is considered that the suppression of air resistance as intended in Patent Document 1 can also be intended in Patent Document 2. In detail, Patent Document 2 and Patent Document 1 are different from each other in terms of the expression of Patent Document 1, such as the distance from the spinneret surface to the top of the tubular portion having a small cross-sectional area.

  However, according to the knowledge of the present inventors, the configuration of FIG. 1 in Patent Document 2 and the configuration of FIG. 2 in Patent Document 1 are considered to be substantially the same. There was a similar problem.

  In addition, according to the knowledge of the present inventors, a part of the tapered portion referred to in Patent Document 1, a portion between the tapered portion and a tubular portion having a small cross-sectional area, or a tubular portion having a small cross-sectional area. Some proposals for introducing an airflow other than the airflow introduced from the airflow blowing surface have been proposed (Patent Documents 3 to 6). For example, according to the knowledge of the present inventors, in Patent Document 3, the upper end of a spinning tube corresponding to a tubular portion having a small cross-sectional area as referred to in Patent Document 1 is opened, and indoor air is generated by a negative pressure generator connected to the spinning tube. In order to reduce the risk of the filament yarn coming into contact with the inner surface of the spinning tube, the mouthpiece corresponding to the tapered portion referred to in Patent Document 1 (also described as a funnel in Patent Document 3) And air spinning means may be provided between the spinning tube and the spinning tube, and an air jet may be jetted in the spinning tube axial direction along the inner surface of the spinning tube. FIG. 3 in Patent Document 3 shows a schematic diagram of an apparatus for realizing the proposal of Patent Document 3.

  However, according to the knowledge of the present inventors, the configuration around the filament corresponding to the filament yarn on the upstream side in the traveling path direction of the filament yarn from the mouthpiece including the mouthpiece in FIG. In addition, there are illustrations of a first perforated cylinder corresponding to a cylindrical airflow blowing surface, a mouthpiece corresponding to a tapered portion as described in Patent Document 1, and the like. The configuration of 2 is considered to be almost the same. For this reason, the above-described problem of Patent Document 1 relating to the upstream region in the traveling path direction of the filament yarn from the tapered portion including the tapered portion in particular is also the same. Further, according to the knowledge of the present inventors, the airflow introduced from the upper end of the first perforation cylinder or the spinning tube is from indoor air whose temperature is not particularly controlled from the description or illustration of Patent Document 3. It is thought that it is formed. For this reason, there is a problem that temperature unevenness of the indoor air, temperature fluctuation, and the like become disturbances, and the uniformity of the thickness and quality unevenness of the filament yarn deteriorates. Further, according to the knowledge of the present inventors, the airflow introduced from the upper end of the spinning tube is such that the airflow introduction portion closest to the negative pressure generating device is the upper end of the spinning tube as shown in FIG. In some cases, the yarn is rapidly introduced into the upper end of the spinning tube having a small cross-sectional area. Moreover, according to the knowledge of the present inventors, even when an air jet is provided between the mouthpiece and the spinning tube and an air jet is introduced, the air jet is rapidly introduced into the upper end of the spinning tube having a small cross-sectional area. For this reason, there is a problem of promoting thread wobble and the like. Further, according to the knowledge of the present inventors, there was a problem that the airflow introduced from the upper end of the spinning tube and the airflow flowing in from the mouthpiece collided rapidly and merged to promote yarn shaking and the like. .

  Further, according to the knowledge of the present inventors, in Patent Document 4, a plurality of inlet openings are provided in the wall surface of the capacitor corresponding to the tapered portion referred to in Patent Document 1, and air flow for additional cooling is provided. And introducing an air flow for additional cooling by suction or spraying. Further, according to the knowledge of the present inventors, in FIG. 1 to FIG. 4 in Patent Document 4, from the description in Patent Document 4, etc., as a specific example, two inlet openings are travel paths of the filament yarn of the capacitor. FIG. 4 in Patent Document 4 shows a diagram in which the two inlet openings are connected to a blower in the ring chamber connected downstream of the direction. A connected diagram is shown.

  However, according to the knowledge of the present inventors, in FIG. 1 to FIG. 4 in Patent Document 4, the configuration around the filament corresponding to the filament yarn is upstream of the entrance opening in the filament yarn traveling path direction. In addition, there are illustrations of a gas permeable side wall corresponding to a cylindrical airflow blowing surface, a capacitor corresponding to a tapered portion referred to in Patent Document 1, and the like. The configuration of 2 is considered to be almost the same. For this reason, the above-described problem of Patent Document 1 relating to the upstream region in the traveling path direction of the filament yarn from the tapered portion including the tapered portion in particular is also the same. Further, according to the knowledge of the present inventors, the airflow introduced by suction or blowing action from the inlet opening is immediately introduced into the condenser and immediately into the acceleration section corresponding to the tubular portion having a small cross-sectional area as described in Patent Document 1. Since it was introduced rapidly, there was also a problem that promoted yarn shaking. Further, according to the knowledge of the present inventors, there was a problem that the airflow introduced from the inlet opening and the airflow flowing in from the condenser collided and merged at a stretch to promote yarn swaying.

  Further, according to the knowledge of the present inventors, in Patent Document 5, a small-diameter portion of the introduction pipe corresponding to the tubular portion having a small cross-sectional area referred to in Patent Document 1 is provided so as to surround the small-diameter portion of the introduction pipe. An injection pipe for injecting air from the pipe, and a rectification part and an injection port for rectifying the air flow injected into the injection pipe are formed in the injection pipe, and a plurality of sheets are provided in the rectification part. The annular partition plate is fitted in a state parallel to the longitudinal axis of the introduction pipe so that the rectified air flow flows parallel to the longitudinal axis of the introduction pipe, and the air flow of the rectification unit The rectification direction is parallel to the longitudinal axis of the introduction pipe. Further, in FIG. 4 and the like in Patent Document 5, a cross-sectional view and the like showing the configuration of the embodiment proposed in Patent Document 5 is shown.

  However, according to the knowledge of the present inventors, it corresponds to the filament yarn upstream in the traveling direction of the filament yarn from the small diameter portion of the introduction tube including the small diameter portion of the introduction tube in FIG. The structure around the yarn is that the inner surface of the air rectifying body corresponding to the cylindrical airflow blowing surface, the tapered portion referred to in Patent Document 1, and the taper and small diameter portion corresponding to the tubular portion having a small cross-sectional area. There are also illustrations of the introduction pipe and the like, which are somewhat different in detail, but are considered to be substantially the same as the configuration of FIG. For this reason, the above-described problem of Patent Document 1 relating to the upstream region in the traveling path direction of the filament yarn from the tapered portion including the tapered portion in particular is also the same. Further, according to the knowledge of the present inventors, it is considered from the description and illustration of Patent Document 5 that the airflow introduced from the air rectifier is formed from room air whose temperature is not particularly controlled. For this reason, there is a problem that temperature unevenness of the indoor air becomes a disturbance and uniformity of the filament yarn thickness unevenness and quality unevenness deteriorates.

  Further, according to the knowledge of the present inventors, in Patent Document 6, in the description relating to FIG. 4 in Patent Document 6, traveling of filament yarn of a conical tube corresponding to the tapered portion referred to in Patent Document 1 is performed. It is described that the second quenching gas flow is introduced into the fiber corresponding to the filament yarn on the downstream side in the path direction, and FIG. 4 in Patent Document 6 shows the second quenching gas flow. The second cylindrical screen that passes through, and the second quenching gas flow that follows the second cylindrical screen is sandwiched between the conical tube and the second tube that correspond to the tapered portion in Patent Document 1 The illustrated flow path and the like are illustrated. Further, according to the knowledge of the present inventors, in the description related to FIG. 4 in Patent Document 6, the inner diameter of the conical tube corresponding to the tapered portion described in Patent Document 1 is the same as that in Patent Document 6. As shown in FIG. 4, it is also possible that the diameter may be continuously reduced or may remain at a substantially constant inner diameter after being reduced over a predetermined length at first. Has been.

  However, according to the knowledge of the present inventors, the configuration around the fiber on the upstream side in the traveling path direction of the filament yarn from the conical tube including the conical tube in FIG. There are also illustrations of a first cylindrical screen corresponding to a cylindrical airflow blowing surface, a tapered portion referred to in Patent Document 1, and a conical tube corresponding to a tubular section having a small cross-sectional area, etc. Is somewhat different, but is considered to be substantially the same as the configuration of FIG. For this reason, the above-described problem of Patent Document 1 relating to the upstream region in the traveling path direction of the filament yarn from the tapered portion including the tapered portion in particular is also the same. Further, according to the knowledge of the present inventors, the second quenching gas flow passes through the flow path sandwiched between the conical tube and the second tube after passing through the second cylindrical screen. Since it is introduced into the fiber, there is a problem that it is easily disturbed by the influence of the resistance of the flow path sandwiched between the conical tube and the second tube.

  Further, according to the knowledge of the present inventors, for example, by increasing the overall flow velocity and flow rate of the airflow blown from the cylindrical airflow blowing surface of the inner blowing cylindrical cooling means, the cylindrical airflow blowing In the area surrounded by the surface, the airflow acting on the filament yarn is increased by increasing the flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn of the airflow, and decreasing the relative velocity between the filament yarn and the airflow. It is conceivable to suppress an increase in tension due to resistance and air resistance.

  However, by simply increasing the flow velocity and flow rate of the airflow blown from the cylindrical airflow blowing surface as a whole, it is compared with a tapered portion or a tubular portion having a small cross-sectional area as described in Patent Document 1. The flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn of the airflow in the region surrounded by the cylindrical airflow blowing surface having a large cross-sectional area in the direction perpendicular to the traveling path direction of the filament yarn, In order to increase the air resistance acting on the filament yarn and the flow velocity sufficient to suppress the increase in tension due to the air resistance, the flow velocity and flow rate of the air blown from the cylindrical air blowing surface must be increased considerably. In addition to problems such as requiring large energy to supply airflow and increasing the production cost of filament yarn, it is blown out from the cylindrical airflow blowing surface. That the flow velocity, the greater air flow rate, the yarn swing was a problem such that occur.

  Further, according to the knowledge of the present inventors, Patent Document 7 includes the flow velocity and flow rate of the air flow blown from a cylindrical air flow blowing surface (described as a cold air blowing surface of the cylindrical cooling cylinder in Patent Document 7). There is a description suggesting that the filament yarn is increased from the upstream side toward the downstream side in the traveling path direction.

  However, the area surrounded by the cylindrical airflow blowing surface is increased by increasing the flow velocity and flow rate of the airflow blown from the cylindrical airflow blowing surface from the upstream side to the downstream side in the filament yarn traveling path direction. In order to increase the flow velocity in the direction from the upstream side to the downstream side in the travel path direction of the filament yarn of the air flow to a flow velocity sufficient to suppress the air resistance acting on the filament yarn and the increase in tension due to the air resistance Further, it is necessary to considerably increase the flow velocity and flow rate of the airflow blown from the downstream side of the cylindrical airflow blowing surface, particularly in the traveling direction of the filament yarn, and there is a problem that yarn swaying occurs. There is also a problem that the yarn sway propagates to the upstream side in the traveling path direction of the filament yarn.

  As described above, according to the knowledge of the present inventors, conventionally, the air resistance acting on each single yarn of the filament yarn is suppressed, and the increase in tension due to this air resistance is suppressed, thereby suppressing the stress. Have been studied, but problems such as those described above, such as yarn wobbling, remained.

  In recent years, filament yarns with various improvements have been developed and marketed due to diversification of needs. For example, in the apparel field, the single yarn has a fine cross-section with the aim of finer and more filamentous single yarn with the aim of giving a soft texture, improved water absorption and quick drying, and the glossiness is changed. Improvements such as modification of thermoplastic polymers have been made with the aim of imparting new functionality such as realization of dyeing with excellent properties. Similarly, in the industrial field, in addition to making single yarn finer, multifilament, and single yarn irregular cross-section, new functionalities such as high strength, high elasticity, weather resistance, flame resistance, etc. Improvements such as the modification of targeted thermoplastic polymers have been made. Furthermore, in recent years, attempts have been actively made to provide a combination of the above-described functionalities.

  However, special yarns as described above are high-functional varieties having excellent functionality, but also difficult-to-spin varieties that are extremely difficult to melt-spin, and according to the knowledge of the present inventors, one of the major problems. Many of these difficult-spinning varieties tend to solidify rapidly in the vicinity of the spinneret after being spun from the spinneret, and the stress acting on each single yarn of the filament yarn tends to increase until it almost solidifies. is there. That is, as a result of the tendency for the stress to increase, there has been a problem that it is difficult to obtain a filament yarn excellent in quality such as high elongation, elongation, or strength. For example, if each single yarn of the filament yarn is made into a single yarn fineness, each single yarn is easily solidified in the vicinity of the spinneret, and if each single yarn of the filament yarn is made into a single yarn profile, the surface area of each single yarn Since air resistance and the like are larger than those of the round cross section, each single yarn is easily solidified in the vicinity of the spinneret. An example of a method for modifying a thermoplastic polymer is copolymerization. Generally, when copolymerization is performed, the molecular structure is disturbed, so that the strength and elongation of the filament yarn are likely to deteriorate. For this reason, in many cases, a measure to increase the melt viscosity of the thermoplastic polymer is taken, but in this case, each single yarn of the filament yarn is easily solidified in the vicinity of the spinneret. In addition, some thermoplastic polymers have higher glass transition temperatures than commonly used polyesters and polyamides, etc., and in filament yarns composed of such special thermoplastic polymers, each single unit After all, the yarn is easily solidified in the vicinity of the spinneret. Furthermore, when combining a plurality of functions as described above, for example, combining single yarn fineness / multifilament and single yarn irregular cross-section, or single yarn fineness / multifilament and modification of thermoplastic polymer In the case of the above, each single yarn of the filament yarn is further easily solidified in the very vicinity of the spinneret.

As described above, the problem of stress acting on each single yarn of the filament yarn is aimed at suppressing a decrease in strength, elongation, strength, etc. as the spinning speed is increased, or even if the speed is increased. Needless to say, it is important to maintain high elongation, elongation, strength, etc. at the same level as when high speed is not achieved, and single yarn fineness / multifilament with excellent quality such as elongation, elongation, strength, etc. It is also important for the purpose of producing highly functional filament yarns such as filament yarns, and solving this problem has an extremely important industrial significance.
Japanese translation of PCT publication No. 2002-510754 Japanese Patent Laid-Open No. 3-180508 Japanese National Patent Publication No. 8-506393 JP 2001-81625 A JP 2001-336023 A Special table 2003-520303 gazette JP-A 61-174411

  The object of the present invention is to solve the above-mentioned problems, and in particular, excellent quality such as high elongation, elongation, strength, etc., uniformity of yarn thickness spots, quality spots, etc., and quality such as fluff. An object of the present invention is to provide an apparatus and a method for manufacturing a filament yarn with good productivity and versatility.

  In order to achieve the above object, the present invention provides a spinneret for spinning a molten thermoplastic polymer as a filament yarn, and a circular cross-sectional shape in a direction perpendicular to the traveling path direction of the filament yarn. The filament yarn manufacturing apparatus includes at least cooling means that surrounds the travel path from the outer peripheral side and has an airflow blowing surface that blows an air flow inwardly from the outer peripheral side of the filament yarn travel path to cool the filament yarn. Thus, the cross-sectional shape of the airflow blowing surface of the cooling means in a direction perpendicular to the filament yarn travel path direction is gradually reduced from the upstream side to the downstream side in the filament yarn travel path direction. An apparatus for producing a filament yarn is provided.

  The present invention also provides a method for producing a filament yarn, characterized in that the filament yarn is produced by melt spinning a thermoplastic polymer using the filament yarn production apparatus described above.

  According to the present invention, filament yarn excellent in quality such as high elongation, elongation, strength, etc., uniformity of yarn thickness spots, quality spots, etc., and quality such as fluff, productivity, versatility Can be manufactured under good conditions.

  Hereinafter, an example of the best embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view schematically illustrating an example of a preferred melt spinning configuration according to an example of the present embodiment. In FIG. 1, 1 is a spinneret, 2 is a spin pack, 3 is a spin block, 4 is a cooling means, 5 is a surface on the side of the filament yarn from which the airflow of the airflow blowing portion is blown out, and the filament yarn runs through the filament yarn. An airflow blowing surface provided so as to be surrounded from the outer periphery side of the path, 6 is an airflow blowing part (portion filled with a line perpendicular to the traveling direction of the filament yarn in the drawing), 7 is an airflow chamber, 8 Is an airflow supply port, 9 is an airflow blown from the airflow blowing surface, 10 is a filament yarn, 11 is a means for applying a thread oil agent, converging, guiding and guiding, 12 is a thread take-up means, and 13 is a thread winding means. Further, D is an inner diameter in a direction perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface at a position in the traveling path direction of the filament yarn. Hereinafter, the inner diameter of the airflow blowing surface at a position in the filament yarn traveling path direction perpendicular to the filament yarn traveling path direction is referred to as the inner diameter of the airflow blowing surface at a position in the filament yarn traveling path direction, or It is simply called the inner diameter of the airflow blowing surface. QTD is a surface in a direction perpendicular to the traveling path direction of the filament yarn on the downstream side of the traveling path direction of the filament yarn of the spinneret for spinning the filament yarn (hereinafter referred to as the lower surface of the spinning nozzle). To the upper end on the upstream side in the direction of travel of the filament yarn on the airflow blowing surface of the cooling means (hereinafter referred to as the upper end of the airflow blowing surface). Hereinafter, the distance from the lower surface of the spinneret to the upper end of the airflow blowing surface of the cooling means is referred to as a cooling start distance, and the position of the upper end of the airflow blowing surface of the cooling means from the lower surface of the spinneret is referred to as a cooling start position. I will do it.

  In FIG. 1, a filament yarn 10 is spun from a spinneret 1 and is cooled and solidified by an airflow 9 blown from an airflow blowing surface 5 through an airflow supply port 8, an airflow chamber 7, and an airflow blowing portion 6. Thereafter, the yarn is taken up by the yarn winding means 13 after passing through the means 11 for applying the thread oil agent, converging, guiding, guiding and the like and the thread take-up means 12. In addition, the wound filament yarn 10 is then subjected to stretching, heat treatment, and the like in other steps (not shown) as necessary.

  In FIG. 1, an extruder, a pump, a filter, a pipe, and the like that supply the thermoplastic polymer that constitutes the filament yarn, and the discharge holes that are drilled and arranged in the spinneret are not shown. It may be provided. In addition, spinning pack heaters, heat insulation members, heat insulation members, etc. that heat and heat the spin pack, air flow generating means such as fans and blowers that supply air flow, air flow piping, air flow filters, air flow components and temperature, humidity, flow rate Although air flow adjusting means such as the flow rate, the flow direction, and the distribution thereof are not shown, they may be provided. Also, in general, for the purpose of preventing the influence of turbulence etc. in the field atmosphere in melt spinning, spinning packs, spin blocks, cooling means, heating devices provided for the purpose of slow cooling, heating cylinders, heat insulation cylinders, etc. Although there are many cases where sealing is performed in the vicinity of this, this is not shown in FIG. 1 but may be performed.

  In addition, in FIG. 1, a heat insulating member, a heat retaining member, a heating member, a cooling member, a heating device, a cooling device, a temperature measuring device, a heating device, a heating tube, a heat retaining tube, etc., a yarn entanglement device, a heating device, etc. Yarn heating means such as rollers and heating tubes, yarn humidification means, yarn relaxation means, yarn path ducts, yarn drawing means such as drawing rollers, yarn suction means such as suction guns, yarn sending means for sending filament yarns by airflow, conveyors, etc. Inactive gas such as noble gas, nitrogen, steam, air, moisture, etc. for the purpose of suppressing dirt on the lower surface of the spinneret due to monomers generated from filament yarn, etc. Monomer suppression means for supplying air etc. near the lower surface of the spinneret and monomer suction means for sucking and removing monomers etc. It may be provided. Further, cooling means such as uniflow cooling means, inner blown cylindrical cooling means, outer blown cylindrical cooling means, and so on, cooling means such as uniflow cooling means, inner blown cylindrical cooling means, outer blown cylindrical cooling means, etc. Instead of airflow blowing, one or a plurality of suctioning means or the like as used for airflow suction may be provided.

  Now, a first important embodiment of the present embodiment will be described. A first important embodiment of the present embodiment is, for example, as shown in FIG. 1, a spinneret for spinning a molten thermoplastic polymer as a filament yarn, and a direction perpendicular to the traveling path direction of the filament yarn. A cooling means having a circular cross-sectional shape, surrounding the filament yarn traveling path from the outer peripheral side, and providing an air flow blowing surface for blowing the air flow inward from the outer peripheral side of the filament yarn traveling path to cool the filament yarn; A filament yarn manufacturing apparatus having at least a cross-sectional shape perpendicular to the filament yarn traveling path direction of the airflow blowing surface of the cooling means from an upstream side to a downstream side of the filament yarn traveling path direction. An apparatus for producing a filament yarn, wherein the filament yarn is arranged so as to become gradually smaller toward the center. In the following, in the first important embodiment of the present embodiment, in the description of the first important embodiment of the present embodiment, the form related to the first important embodiment of the present embodiment, etc. , “Arranging the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface of the cooling means so as to gradually decrease from the upstream side to the downstream side in the traveling path direction of the filament yarn” “The inner diameter (inner diameter D of the airflow blowing surface) in the direction perpendicular to the filament yarn traveling path direction on the airflow blowing surface of the cooling means is gradually decreased from the upstream side to the downstream side in the filament yarn traveling path direction. It is mainly referred to as “arranging in such a manner. Further, in the present embodiment, the traveling direction of the filament yarn indicates the global traveling direction of the filament yarn and each single yarn thereof. For example, in FIG. Show. Further, for example, in FIG. 1, the upstream side in the traveling path direction of the filament yarn is the upstream side in the traveling path direction of the filament yarn, and the downstream side in the traveling path direction of the filament yarn is in the drawing. The lower side in the figure is shown. The traveling direction of the filament yarn and each single yarn indicates the traveling direction predicted from the actual traveling direction and yarn path of the filament yarn and each single yarn. For example, in FIG. In addition, the single yarns run obliquely downward from the spinneret 1 toward the means 11 for applying the thread oil agent, converging, guiding, guiding, and the like. For example, such directions are shown. Furthermore, the traveling path of each single yarn indicates a specific traveling path of each single yarn, for example, a yarn path of each single yarn. In the present embodiment, the “outermost peripheral surface of the filament yarn traveling path” refers to the filament yarn traveling path through the filament yarn single traveling path that travels on the outermost periphery as viewed from the filament yarn traveling path. The surface enclosing from the outer peripheral side shall be shown. The “innermost circumferential surface of the filament yarn traveling path” refers to the filament yarn traveling path on the inner circumferential side through the traveling path of a single filament yarn traveling on the innermost circumference as viewed from the filament yarn traveling path. The surface enclosed by For example, when the number of single yarns spun from a single spinneret is one, the outermost circumferential surface and the innermost circumferential surface of the filament yarn traveling path are the same, and the filament yarn passes through the single yarn traveling path to perform spinning. A surface surrounding the straight line in the traveling path direction of the filament yarn passing through the center of the lower surface of the base from the outer peripheral side is shown. Also, for example, when the number of single yarns spun from one spinneret is single, and the traveling path of the filament yarn single yarn overlaps with the straight line in the traveling path direction of the filament yarn passing through the center of the lower surface of the spinneret, It is assumed that the outermost peripheral surface of the filament yarn traveling path is the same as the outer surface of the single filament yarn spun from the spinneret, and there is no innermost circumferential surface of the filament yarn traveling path.

  In the first important embodiment of the present embodiment, the cooling means is perpendicular to the traveling path direction of the filament yarn, as is the case with the highly blown cylindrical cooling means with high potential excellent in uniform cooling, cooling capacity, versatility, etc. The cooling means is provided with an air flow blowing surface that has a circular cross-sectional shape in a certain direction, surrounds the filament yarn travel path from the outer periphery side, and blows and cools the air flow inward from the outer periphery side of the filament yarn travel path. Furthermore, the inner diameter of the airflow blowing surface of the cooling means is disposed so as to gradually decrease from the upstream side to the downstream side of the filament yarn traveling path direction, so that it is surrounded by the airflow blowing surface of the cooling means. In the region, the flow velocity in the direction from the upstream side to the downstream side of the filament yarn traveling path direction can be increased, and the relative speed between each filament yarn and the air flow can be reduced. Since, it is possible to suppress the increase in tension caused by air resistance and the air resistance acting on each single yarn of filament yarns, it is possible to suppress the stress. At the same time, by arranging the inner diameter of the airflow blowing surface of the cooling means so as to gradually decrease from the upstream side to the downstream side in the traveling path direction of the filament yarn, generally in the manufacturing process, from the spinneret. Each filament yarn is a filament yarn that is spun, cooled and solidified by an air current, etc., and then each filament yarn is often bundled by means such as applying a thread oil agent, bundling, guiding, guiding, etc. The air flow of the cooling means in the direction perpendicular to the traveling path direction of the filament yarn from the upstream side to the downstream side in the traveling path direction of the filament yarn in accordance with the convergence from the upstream side to the downstream side in the traveling path direction It is easy to bring the surface close to the outermost peripheral surface of the filament yarn traveling path, and each unit on the inner peripheral side of the filament yarn traveling path is an air current blown from the air blowing surface of the cooling means. Including, since each single yarn around the air flow of the filament yarn can easily rectified air flow disturbance or cooling plaques also, it is possible to suppress yarn swaying due airflow turbulence or the like. For this reason, the quality of filament yarn is improved, such as the strength, elongation, and strength of the filament yarn, as well as the uniformity of the thickness and quality of the filament yarn, the quality of the fluff, etc. Improvements can also be achieved.

  Now, details of features and effects of the first important embodiment of the present embodiment will be described. First, in the first important embodiment of the present embodiment, the cross-sectional shape in a direction perpendicular to the traveling path direction of the filament yarn is circular, and the traveling path of the filament thread is set like the inner blow cylindrical cooling means. Cooling means provided with an airflow blowing surface that surrounds from the outer peripheral side and blows and cools the airflow inward from the outer peripheral side of the filament yarn traveling path. For this reason, in the first important embodiment of the present embodiment, each filament yarn is cooled by cooling the filament yarn over the entire circumference with an inward airflow from the outer circumference side of the filament yarn traveling path. Easy to cool uniformly. As a result, the first important embodiment of the present embodiment is capable of suppressing cooling spots, yarn fluctuations, etc. with respect to a conventional method, for example, Uniflo cooling means, and the thickness unevenness and quality of filament yarn. The uniformity of spots and the like can be improved. Further, in the first important embodiment of the present embodiment, the airflow blown from the airflow blowing surface is easily increased by the reduction of the flow path as it goes toward the inner peripheral side of the filament yarn traveling path. As a result, the first important embodiment of the present embodiment has a relatively high cooling capacity and is excellent in versatility such as compatibility with various types. Furthermore, in the first important embodiment of the present embodiment, the air flow blowing surface is provided so as to surround the outer peripheral side of the traveling path of the filament yarn. As a result, the first important embodiment of the present embodiment can suppress the influence of the disturbance of the field atmosphere on the filament yarn and the like, and the uniformity of the filament yarn thickness unevenness and quality unevenness etc. Further improvement can be achieved. Therefore, the first important embodiment of the present embodiment is excellent in uniform cooling, cooling capacity, versatility, and the like. Further, in the first important embodiment of the present embodiment, each single yarn of the filament yarn can be easily cooled uniformly, so that it is of course effective for multifilament filament yarns. For example, it is possible to suppress cooling spots and yarn fluctuations with respect to the Uniflo cooling means, and to improve uniformity of the thickness and quality spots of the filament yarn.

  Secondly, in the first important embodiment of the present embodiment, the inner diameter of the airflow blowing surface of the cooling means is arranged so as to gradually decrease from the upstream side to the downstream side in the traveling direction of the filament yarn. To do. For this reason, the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means is reduced, and the airflow filament in the region surrounded by the airflow blowing surface of the cooling means The flow velocity in the direction from the upstream side to the downstream side in the yarn traveling path direction can be increased, and the relative speed between each single yarn of the filament yarn and the airflow can be reduced. Further, since the inner diameter of the air flow blowing surface is arranged so as to gradually decrease from the upstream side to the downstream side in the filament yarn traveling path direction, the filament yarn in the region surrounded by the air flow blowing surface of the cooling means is arranged. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction is gradually reduced from the upstream side to the downstream side in the traveling direction of the filament yarn, and the filament yarn of the airflow in the region surrounded by the airflow blowing surface of the cooling means The flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn can be gradually increased from the upstream side to the downstream side in the traveling path direction of the filament yarn, and the filament yarn travels until it is spun from the spinneret and solidified. Between each single yarn of the filament yarn and the air flow in accordance with each single yarn of the filament yarn that continues to be refined and increased in yarn speed toward the downstream side in the path direction. It is possible to reduce the relative speed. As a result, in the first important embodiment of the present embodiment, the air resistance acting on each single yarn of the filament yarn and the increase in tension due to this air resistance can be suppressed and the stress can be suppressed. Quality such as elongation and strength can be improved. In addition, the first important embodiment of the present embodiment is an airflow blowout surface in which each single yarn of the filament yarn is likely to be thinned and the yarn speed of each single yarn is likely to increase, particularly under the action of cooling or the like. In the region surrounded by the air flow blowing surface of the cooling means, the inner diameter itself of the air flow blowing surface is arranged so as to gradually decrease from the upstream side to the downstream side in the traveling direction of the filament yarn. Since the flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn of the air current in the enclosed region is increased, and the relative speed between each single yarn of the filament yarn and the air flow is reduced, In accordance with the deformation behavior of each single yarn of the filament yarn, the air resistance acting on each single yarn of the filament yarn, the increase in tension due to this air resistance, and the feature that the stress can be effectively sufficiently suppressed are also provided.

  Thirdly, in the first important embodiment of the present embodiment, the inner diameter of the airflow blowing surface of the cooling means is gradually decreased from the upstream side to the downstream side in the traveling path direction of the filament yarn. In general, in the manufacturing process, the single yarn is spun from the spinneret, cooled and solidified by an air flow, etc., and then each single yarn is converged by means such as applying a thread oil agent, converging, guiding and guiding. In many filament yarns, each filament yarn is converged from the upstream side to the downstream side in the traveling direction of the filament yarn, and the filament yarn extends from the upstream side to the downstream side in the traveling direction of the filament yarn. The airflow blowing surface of the cooling means can be easily brought close to the outermost peripheral surface of the filament yarn traveling path in a direction perpendicular to the traveling path direction of the filament yarn. Can easily rectified by airflow blown out from the blowing airflow surface means, the disturbance of each single yarn around the airflow can be suppressed. In addition, since the airflow blowing surface of the cooling means can be easily brought close to the outermost peripheral surface of the filament yarn traveling path, the airflow blown from the airflow blowing surface of the cooling means is introduced to the inner circumferential side of the filament yarn traveling path. Cooling spots can be suppressed between each single yarn on the outer peripheral side and each single yarn on the inner peripheral side of the traveling path of the filament yarn. Further, the cross-sectional area of the cross section in a direction perpendicular to the direction of the filament yarn traveling path in the region surrounded by the air flow blowing surface of the cooling means while bringing the air blowing surface of the cooling means close to the outermost peripheral surface of the filament yarn traveling path. Is gradually decreased from the upstream side in the traveling path direction of the filament yarn toward the downstream side, and from the upstream side in the traveling path direction of the filament yarn of the airflow in the region surrounded by the airflow blowing surface of the cooling means. The flow velocity in the direction is gradually increased from the upstream side to the downstream side in the filament yarn traveling path direction, and is gradually accelerated. Therefore, the air flow in the region surrounded by the air flow blowing surface of the cooling means is increased in the filament yarn traveling path direction. In the process of being accelerated from the upstream side toward the downstream side, it is difficult to disturb, and the airflow blown from the airflow blowing surface of the cooling means is rectified, Can easily introduced into the inner peripheral side of Iramento yarn travel path, it is possible to suppress yarn swaying like. As a result, the first important embodiment of the present embodiment can suppress airflow turbulence, cooling spots, yarn fluctuations due to airflow turbulence, etc. The uniformity can be improved. In addition, uniformity can be improved, and yarn wobble can be suppressed, so defects due to spots and single yarn scratches can be suppressed, and the filament yarn can be further improved in quality such as strength, elongation and strength. In addition to the improvement, fluff and yarn breakage can be suppressed, and the quality and productivity of the filament yarn can be improved.

  Furthermore, fourthly, in the first important embodiment of the present embodiment, the inner diameter of the airflow blowing surface of the cooling means is gradually decreased from the upstream side to the downstream side in the traveling direction of the filament yarn. By arranging the air flow around each single yarn of the filament yarn from the area of the airflow blowing surface of the cooling means, the air resistance acting on each single yarn of the filament yarn and the increase in tension due to this air resistance are suppressed. Since the stress is suppressed, each single yarn of the filament yarn is abruptly thinned and the yarn speed is rapidly increased from the upstream side in the traveling direction of the filament yarn, compared to the conventional technique, for example, Patent Document 1 and the like. Therefore, the tension and stress are likely to increase rapidly due to air resistance, etc., and are easily affected by air flow turbulence, etc. Direction of travel path Capturing the area on the flow side, effectively rectifying the airflow around each single yarn of the filament yarn, while sufficiently increasing the air resistance acting on each single yarn of the filament yarn and the increase in tension due to this air resistance It is easy to suppress and suppress stress sufficiently. Therefore, the first important embodiment of the present embodiment is more effective than the conventional technique, while maintaining or further improving the uniformity of the thickness variation and quality variation of the filament yarn. It also has a feature that it is easy to further improve the quality of the yarn, such as the strength, elongation, and strength. Further, the first important embodiment of the present embodiment is more effective in rectifying the air flow around each single yarn of the filament yarn from the upstream side in the traveling path direction of the filament yarn, The air resistance acting on the single yarn and the increase in tension due to this air resistance are suppressed and the stress is easily suppressed. Single yarn finer and multifilament filament yarns, filament yarns with irregular cross-section, or filament yarns or glass with modified thermoplastic polymer that tend to increase the stress acting on each single yarn of the yarn It also has a feature that it is extremely effective for highly functional filament yarns such as filament yarns composed of special thermoplastic polymers having a high transition temperature.

Now, the features and effects of the first important embodiment of the present embodiment will be further described in about three points. Fifth, in the first important embodiment of the present embodiment, the inner diameter of the airflow blowing surface of the cooling means is arranged so as to gradually decrease from the upstream side to the downstream side in the traveling direction of the filament yarn. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means is gradually decreased from the upstream side to the downstream side in the traveling path direction of the filament yarn, In the region surrounded by the airflow blowing surface of the cooling means, the flow velocity of the airflow in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn is gradually increased from the upstream side in the traveling direction of the filament yarn toward the downstream side. By increasing the size, the relative speed between each single yarn of the filament yarn and the air flow is reduced to suppress the air resistance acting on each single yarn of the filament yarn and the increase in tension due to this air resistance, To suppress the force. For this reason, in the first important embodiment of the present embodiment, the flow path direction of the filament yarn of the airflow in the region surrounded by the airflow blowing surface of the cooling means is higher than that of the conventional technique, for example, Patent Document 1 or the like. It is easy to increase the flow velocity in the direction from the upstream side to the downstream side with a smaller airflow that is blown out from the airflow blowing surface. Further, in the first important embodiment of the present embodiment, it is surrounded by the air flow blowing surface of the cooling means on the upstream side in the traveling path direction of the filament yarn, compared to the conventional technique, for example, Patent Document 1 and the like. It is easy to increase the flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn of the airflow in the region with a smaller airflow blown from the airflow blowing surface. Therefore, the first important embodiment of the present embodiment has sufficient air resistance acting on each single yarn of the filament yarn, increase in tension due to this air resistance, and sufficient stress with a smaller airflow than in the prior art. In addition to being able to reduce energy required for supplying airflow, etc., there is an energy saving effect, and the manufacturing cost of the filament yarn can be reduced.
Sixth, in the first important embodiment of the present embodiment, the inner diameter of the airflow blowing surface of the cooling means is disposed so as to gradually decrease from the upstream side to the downstream side in the traveling direction of the filament yarn. To do. For this reason, the inner diameter of the airflow blowing surface tends to be small, and the inner diameter of the airflow blowing surface becomes small on the downstream side of the filament yarn traveling path direction. For example, the airflow chamber of the cooling means indicated by 7 in FIG. Easy to enlarge. Therefore, the first important embodiment of the present embodiment is easy to equalize and equalize the airflow in the airflow chamber, for example, the circumferential direction surrounding the traveling path of the filament yarn of the airflow blown from the airflow blowing surface It is easy to uniform the flow velocity distribution of each filament yarn, so that each filament yarn can be cooled more uniformly in the circumferential direction, and the uniformity of the filament yarn thickness unevenness and quality unevenness can be further improved. It also has the feature that it can. In the first important embodiment of the present embodiment, it can be easily understood from the illustration of FIG. In addition, the first important embodiment of the present embodiment is easy to enlarge the air flow chamber, so it is easy to dispose a means for equalizing and equalizing the air flow in the air flow chamber, such as a pressure loss member. Since it is easy to uniform the flow velocity distribution in the circumferential direction surrounding the traveling path of the filament yarn of the airflow blown out from the airflow blowing surface, it is easy to cool each filament yarn of the filament yarn more uniformly in the circumferential direction, It is possible to further improve the uniformity of the thickness and quality spots of the filament yarn.

  Seventh, in the first important embodiment of the present embodiment, as described above, the inner diameter of the airflow blowing surface is likely to be small, and the inner diameter of the airflow blowing surface is downstream in the traveling direction of the filament yarn. Get smaller. Therefore, according to the first important embodiment of the present embodiment, the cooling means can be made compact by reducing the outer diameter in the direction perpendicular to the traveling path direction of the filament yarn of the cooling means. It is easy to spin a large number of filament yarns in a space, and a melt spinning method or a melt spinning apparatus that spins a large number of filament yarns in a small space (for example, a spinneret or a spin pack is provided). It also has features such as being easy to cope with (short pitch).

  In the present embodiment, the inner diameter D of the airflow blowing surface of the cooling means is disposed so as to gradually decrease from the upstream side to the downstream side of the filament yarn traveling path direction (filament yarn on the airflow blowing surface of the cooling means). The cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn is arranged so as to gradually decrease from the upstream side to the downstream side in the traveling path direction of the filament yarn). As long as the important embodiment and the second important embodiment of the present embodiment to be described later are satisfied, the present invention is not particularly limited, and is perpendicular to the traveling direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means. The first important embodiment of the present embodiment described later and the following will be described later by gradually reducing the cross-sectional area of the cross-section in the direction from the upstream side to the downstream side in the traveling direction of the filament yarn. In the range that satisfies the second important embodiment of the present embodiment, not particularly limited as the present embodiment to various gradually reduced to form is preferred. For example, the cross-sectional area of the cross section in the direction perpendicular to the filament yarn traveling path direction in the region surrounded by the air flow blowing surface and the inner diameter D of the air flow blowing surface within a range not impairing the yarn production stability, etc. The filament may be gradually reduced from the upstream side to the downstream side in the direction, or gradually in steps, or in the process of gradually decreasing from the upstream side to the downstream side in the filament yarn traveling path direction, the filament From the upstream side to the downstream side in the yarn traveling path direction, the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the inner diameter D of the airflow blowing surface and the region surrounded by the airflow blowing surface is gradually reduced. Or the diameter of the air flow blowing surface and the area surrounded by the air flow blowing surface from the upstream side to the downstream side in the traveling direction of the filament yarn. Even if the reduction ratio gradually reducing the cross-sectional area of the cross section in the direction perpendicular to the travel path direction of the reinforcement yarns to partially different as the present embodiment is preferred. Moreover, in the range which satisfies the 1st important embodiment of this embodiment mentioned above and the 2nd important embodiment of this embodiment mentioned later, it was surrounded by the internal diameter D airflow blowing surface of the airflow blowing surface, for example When gradually reducing the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region from the upstream side to the downstream side in the traveling path direction of the filament yarn, A non-blow-out part may be provided between a part of a part, or between a certain airflow blowing surface and a certain airflow blowing surface, or between a certain airflow blowing part and a certain airflow blowing part. In addition, the non-blowing part is not particularly limited, and may be used as, for example, a member that connects a certain air blowing part and a certain air blowing part, or a member that connects a certain air blowing part and a certain air blowing part, or a member that performs a seal or the like. Further, the inner side surface surrounding the traveling path of the filament yarn in the non-blowing part is not particularly limited, and may be, for example, a shape according to the air flow blowing surface. The cross-sectional area of the cross section perpendicular to the traveling path direction of the filament yarn in the region surrounded by the inner diameter D of the airflow blowing surface and the airflow blowing surface is gradually increased from the upstream side to the downstream side in the traveling path direction of the filament yarn. The mode of reducing is not particularly limited, but in the process of gradually decreasing from the upstream side in the filament yarn traveling path direction toward the downstream side, the air flow from the upstream side in the filament yarn traveling path direction toward the downstream side The reduction ratio for gradually reducing the cross-sectional area of the section perpendicular to the traveling path direction of the filament yarn in the area surrounded by the inner diameter D of the blowing surface and the airflow blowing surface is increased on the upstream side in the traveling path direction of the filament yarn. It is preferable to do. Each single yarn of the filament yarn is abruptly thinned, the yarn speed is rapidly increased, tension and stress are likely to increase rapidly due to air resistance, etc., and are also easily affected by airflow turbulence, etc. The air flow around each single yarn of the filament yarn is fully rectified more effectively, corresponding to the delicate and sensitive upstream region in the filament yarn traveling path direction, which is easily disturbed by On the other hand, the air resistance acting on each single yarn of the filament yarn and the increase in tension due to this air resistance are sufficiently suppressed, and the stress is easily suppressed sufficiently. This form is easy to solidify rapidly in the vicinity of the spinneret after being spun from the spinneret, and the stress acting on each single yarn of the filament yarn is likely to increase until it is almost solidified. -Filament yarns made into multifilaments, single yarns with irregular cross-sections, filament yarns modified with thermoplastic polymers, filament yarns composed of special thermoplastic polymers such as high glass transition temperature, etc. This is particularly effective for high-performance filament yarns. Further, since each single yarn of the filament yarn is difficult to sharply reduce in the downstream region of the filament yarn in the traveling path direction, and the yarn speed is also difficult to increase rapidly, The reduction rate for gradually reducing the cross-sectional area of the section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the air flow blowing surface from the upstream side to the downstream side in the traveling path direction of the filament thread is drastically reduced. The filament speed is increased on the upstream side in the traveling path direction of the filament yarn, where the yarn speed is likely to increase rapidly. May be. That is, the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the inner diameter D of the air flow blowing surface and the air flow blowing surface is directed from the upstream side to the downstream side in the filament path direction The reduction rate that is gradually decreased may be increased on the upstream side in the traveling path direction of the filament yarn, and may be decreased on the downstream side in the traveling path direction of the filament yarn.

  In this embodiment, the inner diameter D of the airflow blowing surface of the cooling means is arranged so as to gradually decrease from the upstream side to the downstream side in the filament yarn traveling path direction (filament yarn on the airflow blowing surface of the cooling means). The cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn is arranged so as to gradually decrease from the upstream side to the downstream side in the traveling path direction of the filament yarn). The present embodiment is not particularly limited as long as the important embodiment and the second important embodiment of the present embodiment described later are satisfied, and this embodiment is suitable for various gradually decreasing forms. The form in which the inner diameter D of the airflow blowing surface of the cooling means is gradually reduced from the upstream side to the downstream side in the traveling direction of the filament yarn is not particularly limited. From the upstream side to the downstream side of the travel path direction, the air flow of the cooling means is such that the airflow blowing surface of the cooling means is close to the outermost peripheral surface of the travel path of the filament yarn in the direction perpendicular to the travel path direction of the filament yarn. The inner diameter D of the blowout surface is preferably arranged so as to be gradually reduced from the upstream side toward the downstream side in the filament yarn traveling path direction. First, as described above, when the air flow blowing surface is brought close to the outermost peripheral surface of the filament yarn traveling path, the air flow around each single yarn of the filament yarn is blown by the air flow blown from the air flow blowing surface. This is because it can be easily rectified. Second, when the airflow blowing surface is brought close to the outermost peripheral surface of the filament yarn traveling path, the flow path between the airflow blowing surface and the outermost peripheral surface of the filament yarn traveling path becomes narrow, The airflow blown from the upstream side of the airflow blowing surface, particularly in the filament yarn traveling path direction, passes through this flow path to the region near the lower surface of the spinneret, from the downstream side in the filament yarn traveling path direction to the upstream side. As a result of this upward flow, each single yarn on the outer peripheral side of the filament yarn travel path is stronger than each single yarn on the inner peripheral side from the upstream side of the filament yarn travel path direction. This is because it is easy to be cooled, and it is difficult to cause problems such as cooling spots and yarn wobbling.

  This embodiment is the first important feature of this embodiment described above, depending on the form of the distance in the direction perpendicular to the direction of the filament yarn travel path between the airflow blowing surface of the cooling means and the outermost peripheral surface of the filament yarn travel path. The present embodiment is not particularly limited as long as the present embodiment and the second important embodiment of the present embodiment described later are satisfied, and the present embodiment is suitable for various forms. The distance in the direction perpendicular to the traveling path direction of the filament yarn between the airflow blowing surface of the cooling means and the outermost peripheral surface of the traveling path of the filament yarn is not particularly limited, but is preferably in the traveling path direction of the filament yarn. From the upstream side to the downstream side, it is preferable that the air flow blowing surface and the outermost peripheral surface of the filament yarn traveling path are provided in a direction perpendicular to the filament yarn traveling path direction. When the airflow blowing surface of the cooling means is close to the outermost peripheral surface of the filament yarn traveling path in a direction perpendicular to the filament yarn traveling path direction from the upstream side to the downstream side in the filament yarn traveling path direction, This is because, as described above, the airflow around the single yarn of the filament yarn can be easily rectified by the airflow blown from the airflow blowing surface. Further, the distance in the direction perpendicular to the traveling path direction of the filament yarn between the air flow blowing surface of the cooling means and the outermost peripheral surface of the traveling path of the filament yarn is not particularly limited, but more preferably the traveling of the filament thread. For example, the distance may be in the range of several millimeters to several tens of millimeters from the upstream side to the downstream side in the path direction. Further, the distance in the direction perpendicular to the filament yarn traveling path direction between the air blowing surface of the cooling means and the outermost peripheral surface of the filament yarn traveling path is not particularly limited. The distance in the direction perpendicular to the traveling path direction of the filament yarn from the outermost peripheral surface of the traveling path of the yarn is, for example, about several mm to several tens of mm from the upstream side to the downstream side in the traveling path direction of the filament yarn. The distance in the direction perpendicular to the filament yarn travel path direction between the airflow blowing surface of the cooling means and the outermost peripheral surface of the filament yarn travel path is defined as the upstream of the filament yarn travel path direction. Almost no change from the side to the downstream side, or it may be constant, or there is a gradual increase from the upstream side to the downstream side in the direction of the filament yarn travel path. May is is gradually decreased, or increases and decreases toward the downstream side from the upstream side of the travel path direction of the filament yarns may be as certain singular or plural, or more. Further, the filament yarn may be gradually increased, gradually decreased, increased, or decreased from the upstream side in the traveling path direction in the continuous or stepwise manner, or the upstream side in the traveling path direction of the filament yarn. In the process of gradually increasing, gradually decreasing, increasing or decreasing from the downstream side, the degree of gradual increase, gradual decrease, increase or decrease may be partially changed. Incidentally, in an ordinary method, for example, in an internally blown cylindrical cooling means, the airflow blowing surface is cylindrical, and the filament yarn traveling path direction on the airflow blowing surface is directed from the upstream side to the downstream side in the filament yarn traveling path direction. Since the inner diameter in the direction perpendicular to the inner diameter does not change, in general in the production process, after spinning from the spinneret, cooling and solidifying by airflow, etc., each unit is applied by means such as applying thread oil, converging, guiding, guiding, etc. For filament yarns that are often bundled, each single yarn is bundled from the upstream side in the filament yarn traveling path direction to the downstream side, and the filament yarn traveling path direction from the upstream side to the downstream side. It is difficult to bring the airflow blowing surface of the cooling means close to the outermost peripheral surface of the filament yarn traveling path in a direction perpendicular to the filament yarn traveling path direction. As a result, the airflow blowing surface of the cooling means tends to move away from the outermost peripheral surface of the filament yarn traveling path in the direction perpendicular to the filament yarn traveling path direction from the upstream side to the downstream side in the traveling path direction of the yarn thread. The distance in the direction perpendicular to the traveling path direction of the filament yarn between the airflow blowing surface of the cooling means and the outermost peripheral surface of the traveling path of the filament yarn is from the upstream side to the downstream side in the traveling path direction of the filament yarn. Around 10 mm or more, or about several tens of mm or more, and each filament yarn around the single yarn by the air flow blown from the air flow blowing surface from the upstream side toward the downstream side in the filament yarn traveling path direction There are problems such as difficulty in rectifying the airflow.

  This embodiment is the filament yarn side surface from which the airflow of the airflow blowing portion is blown out, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn is circular, and surrounds the traveling path of the filament yarn from the outer peripheral side, The first important embodiment of the present embodiment described above and the second embodiment of the present embodiment to be described later are provided by the air flow blowing surface 5 for blowing the air flow inward from the outer peripheral side of the filament yarn traveling path to cool the filament yarn. The present invention is not particularly limited as long as important embodiments are satisfied. As long as the first important embodiment of the present embodiment described above and the second important embodiment of the present embodiment to be described later are satisfied, it is suitable for various air flow blowing surfaces, and the number and outer shape of the air flow blowing surfaces. It is not particularly limited by shape, external dimensions, mounting position / orientation, surface shape, surface finish, surface treatment, structure, member configuration, material, and the like. As in the first important embodiment of the present embodiment, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface of the cooling means is preferably circular. Each filament yarn is easy to cool uniformly in the circumferential direction surrounding the filament yarn travel path, and easy to supply air current to each filament yarn evenly in the circumferential direction. For reasons. Accordingly, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface is preferably circular, but is not particularly limited. For example, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface is circular. This embodiment is suitable even if it is an ellipse, a polygonal shape, or a shape close to it without departing from the extreme. If the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface is an ellipse, polygonal shape, or a shape close to it within a range that does not deviate extremely from the circle, the traveling of the filament yarn on the airflow blowing surface The diameter of the inscribed circle or circumscribed circle in the cross section perpendicular to the traveling path direction of the filament yarn on the airflow blowing surface is applied to the inner diameter of the airflow blowing surface which is the inner diameter in the direction perpendicular to the path direction. In addition, the present embodiment is not particularly limited by the length of the filament yarn on the airflow blowing surface of the cooling means in the traveling path direction, and the present embodiment is suitable for various forms. The length of the airflow blowing surface of the cooling means in the traveling path direction of the filament yarn is not particularly limited, but it is preferable that the length be sufficient to cover until each filament yarn is substantially solidified or solidified. In other words, the lower end on the downstream side in the traveling path direction of the filament yarn on the airflow blowing surface of the cooling means (hereinafter, the lower end on the downstream side in the traveling path direction of the filament yarn on the airflow blowing surface is referred to as the lower end of the airflow blowing surface. Is preferably arranged on the downstream side of the filament yarn traveling path direction from the position where each single yarn of the filament yarn is substantially solidified or solidified. The thinning deformation and the increase in the yarn speed of each single yarn of the filament yarn spun from the spinneret are continued toward the downstream side in the traveling path direction of the filament yarn until the filament yarn is solidified. Also, it is obtained by dividing the tension acting on each single yarn of the filament yarn from spinning until it is almost solidified by the cross-sectional area of the cross section in the direction perpendicular to the running direction of each single yarn at the position where it is almost solidified. It is generally known that there is a close correlation between the stress and the birefringence which is a representative value of the degree of molecular orientation of each single yarn of the filament yarn. That is, the lower end of the airflow blowing surface of the cooling means is provided on the downstream side of the filament yarn in the traveling path direction from the position where each filament yarn is substantially solidified or solidified, and each filament yarn is substantially solidified or solidified. By capturing the solidification position and arranging the air flow blowing surface, the air resistance acting on each filament yarn, the increase in tension due to this air resistance, the stress is more reliably suppressed, and the filament yarn's strong elongation It aims to improve quality such as elongation and strength more reliably. Further, it is preferable that the air flow blowing surface is composed of one or a plurality of or a plurality of types of air flow blowing surfaces, and it is also preferable that one, a plurality of or a plurality of types of air flow blowing surfaces are provided in the cooling means, The present embodiment is suitable even if a single, a plurality, or a plurality of types of spinnerets or spin packs are provided with a single, a plurality, or a plurality of types of air flow blowing surfaces.

  The present embodiment is not particularly limited by the air flow blowing unit 6 as long as the first important embodiment of the present embodiment described above and the second important embodiment of the present embodiment described later are satisfied. As long as the first important embodiment of the present embodiment described above and the second important embodiment of the present embodiment to be described later are satisfied, it is suitable for various air flow blowing portions, the number of air flow blowing portions, the outer shape It is not particularly limited by shape, external dimensions, mounting position / orientation, surface shape, surface finish, surface treatment, structure, member configuration, material, and the like. In addition, the configuration in which the inner diameter of the airflow blowing surface, which is the surface on the filament yarn side from which the airflow of the airflow blowing portion is blown out, gradually decreases from the upstream side to the downstream side in the filament yarn traveling path direction, The preferred form relating to the form such as the cross-sectional shape in the direction perpendicular to the direction of travel of the filament yarn on the airflow blowing surface is as described above. The outer shape of the surface other than the airflow blowing surface of the airflow blowing portion is not particularly limited, and the shape of the surface facing the airflow blowing surface to which the airflow of the airflow blowing portion is supplied is not particularly limited. For example, the inner diameter in the direction perpendicular to the traveling path direction of the filament yarn on the surface facing the airflow blowing surface is not particularly limited, and may hardly change from the upstream side to the downstream side in the traveling path direction of the filament yarn, Further, the filament yarn may be gradually increased or decreased from the upstream side in the traveling path direction toward the downstream side, and the increase or decrease in the filament thread traveling direction from the upstream side to the downstream side may be singular or plural or There may be multiple types. Further, the increase, decrease, increase, or decrease gradually from the upstream side in the filament yarn traveling path direction toward the downstream side may be performed continuously or stepwise, or upstream in the filament yarn traveling path direction. In the process of gradual increase, gradual decrease, increase or decrease from the side toward the downstream side, the degree of gradual increase, gradual decrease, increase or decrease may partially change. In addition, regarding the thickness in the direction perpendicular to the traveling path direction of the filament yarn at the airflow blowing portion and the pressure loss of the airflow blowing portion, the description about the inner diameter in the direction perpendicular to the traveling path direction of the filament yarn on the opposite surface of the airflow blowing surface. The same applies. Further, the inner diameter in the direction perpendicular to the traveling path direction of the filament yarn on the surface opposite to the air flow blowing surface is not particularly limited. For example, the air flow chamber of the cooling means indicated by 7 in FIG. Furthermore, it is easy to equalize and equalize the pressure, and the flow velocity distribution in the circumferential direction surrounding the traveling path of the filament yarn of the airflow blown out from the airflow blowing surface is further uniformed, so that the thickness variation and quality of the filament yarn Aiming to further improve the uniformity of spots, etc., like the inner diameter of the air flow blowing surface, arrange so that the filament yarn gradually decreases from the upstream side to the downstream side in the traveling path direction. Also good. Further, the thickness in the direction perpendicular to the traveling path direction of the filament yarn at the airflow blowing portion and the pressure loss of the airflow blowing portion are not particularly limited. For example, in the present embodiment, the inner diameter of the airflow blowing surface is arranged so as to gradually decrease from the upstream side to the downstream side in the filament yarn traveling path direction, and the airflow in the region surrounded by the airflow blowing surface Reduce the flow velocity in the direction from the upstream side to the downstream side in the traveling direction of the filament yarn, particularly the relative speed between each single yarn of the filament yarn and the airflow, particularly in the downstream side in the traveling route direction of the filament yarn. It is easy to increase the flow rate to a sufficient level. Therefore, the flow velocity distribution in the traveling path direction of the filament yarn of the airflow blown out from the airflow blowing surface is from the upstream side to the downstream side in the traveling path direction of the filament yarn, aiming at energy saving and reducing the manufacturing cost of the filament yarn. The thickness in the direction perpendicular to the traveling path direction of the filament yarn in the airflow blowing portion and the pressure loss of the airflow blowing portion from the upstream side in the traveling direction of the filament yarn to the downstream side so that the distribution gradually decreases toward the You may arrange | position so that it may become large gradually. Moreover, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the surface facing the airflow blowing surface is not particularly limited. For example, this embodiment is suitable even if the shape is slightly deviated from a circle. Although not particularly limited, the cross-sectional shape in the direction perpendicular to the traveling direction of the filament yarn on the surface facing the airflow blowing surface is preferably circular. The airflow blown out from the airflow blowing surface is easy to apply pressure loss uniformly in the circumferential direction surrounding the filament yarn travel path, and each filament yarn is easy to cool uniformly in the circumferential direction. Furthermore, it is because it is easy to supply airflow uniformly in the circumferential direction to each single yarn of the filament yarn. In addition, this embodiment is suitable even if the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn at the airflow blowing portion is partially different, and this embodiment is suitable, even if there are one or a plurality of different portions. Is preferred. In addition, this embodiment is suitable even if the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn at the airflow blowing portion changes by one or a plurality or a plurality of types along the traveling path direction of the filament yarn. In addition, the member of the airflow blowing portion is not particularly limited, a member composed of holes, orifices, slits, etc., a rectifying grid such as a wire mesh, punching metal, honeycomb, etc., a porous member composed of particles, fibers, plates, etc. A porous member constituted by weaving or knitting fibers, a porous member having porosity, a porous member constituted by laminating cellulose sheets or rings, ribbons, etc., a metal sheet having slit-like grooves, Porous members constructed by laminating thin plates, rings, ribbons, etc., porous members constructed by laminating metal particles, metal fibers, etc., porous members constructed by winding metal linear bodies, metal ribbons, etc. Even if it is a member close | similar to these, even if it is comprised from a single or multiple or multiple types of member, this embodiment is suitable. The airflow blowing portion is not particularly limited, but preferably, the airflow blowing portion is preferably composed of an airflow straightening member that can easily rectify the airflow blown from the airflow blowing surface. In addition, as an airflow rectification member, the above-mentioned members are mentioned as an example. The material of the airflow blowing part is not particularly limited, and metals such as aluminum, copper, bronze, brass, iron, carbon steel, bonde steel, stainless steel, stainless alloy, tungsten, tungsten alloy, cement, synthetic resin, natural resin, Fibers, chemical fibers, natural fibers, paper, wood, cellulose, ceramics, carbon, etc. are also suitable, and this embodiment is suitable even if they are composed of a single material or a plurality of materials. Further, even if a heat insulating member, a heat retaining member, a heating member, a cooling member, a heating unit, a cooling unit, a measuring unit such as a temperature, and the like are provided, this embodiment is suitable. Further, it is preferable that the air flow blowing portion is composed of one or a plurality of or a plurality of types of air flow blowing portions, and it is also preferable that the air flow blowing portion is provided in the cooling means. Even if a single, a plurality, or a plurality of types of air blowout portions are provided for a single, a plurality, or a plurality of types of spinneret or spin pack, this embodiment is suitable.

  The present embodiment is not particularly limited by the outermost circumferential surface of the filament yarn traveling path, the innermost circumferential surface of the filament yarn traveling path, and the like, and is suitable for various forms of the outermost circumferential surface and the innermost circumferential surface. Although not particularly limited, it is preferable that the outermost peripheral surface of the filament yarn traveling path be spun from the upstream side of the filament yarn traveling path direction to the downstream side in a direction perpendicular to the filament yarn traveling path direction. It is preferable that the airflow blowing surface 5 and the inner side surface of the upstream member of the cooling means are arranged close to each other as long as they do not interfere with the exit or running. The upstream member of the cooling means refers to a member on the upstream side of the filament yarn traveling path direction of the cooling means. In FIG. 1, the filament yarn traveling path direction from the air flow blowing surface 5 or the air flow blowing portion 6 The members of the cooling means 4 on the upstream side of the filament yarn are members that support, hold, or seal the air flow blowing surface 5 and the air flow blowing portion 6 from the upstream side in the traveling direction of the filament yarn. The inner side surface of the upstream member refers to an inner surface that surrounds the filament yarn traveling path of the upstream member of the cooling means from the outer peripheral side. As described above, this is because, as described above, in particular, the outermost peripheral surface of the filament yarn travel path is disposed close to the airflow blowing surface, so that each filament yarn is blown by the airflow blown from the airflow blowing surface. This is because the airflow around the single yarn can be easily rectified. Second, the flow path between the outermost peripheral surface of the filament yarn traveling path and the airflow blowing surface, etc., by arranging the outermost circumferential surface of the filament yarn traveling path close to the airflow blowing surface or the like. The airflow blown out from the upstream side of the airflow blowing surface 5, particularly in the traveling direction of the filament yarn, passes through this flow path to the region near the lower surface of the spinneret and downstream in the traveling direction of the filament yarn. As a result, the single yarn on the outer peripheral side of the filament yarn traveling path is moved in the direction of the filament yarn traveling path relative to the single inner yarn. This is because it becomes easier to be strongly cooled from the upstream side, and it is difficult to cause problems such as cooling spots and yarn wobbling caused by this. The innermost circumferential surface of the filament yarn traveling path is not particularly limited, but may be handled in the same manner as the outermost circumferential surface of the filament yarn traveling path. First, in particular, the innermost peripheral surface of the filament yarn traveling path is disposed close to the airflow blowing surface 5 and the like, so that the airflow from the airflow blowing surface 5 is used to move the filament yarn around each single yarn. This is because the airflow is easily rectified. Second, the innermost peripheral surface of the filament yarn traveling path is disposed close to the airflow blowing surface 5 and the like, so that each single yarn on the outer peripheral side and each inner peripheral side of the filament yarn traveling path are arranged. This is because problems such as cooling spots between the single yarns are less likely to occur. Thirdly, for example, a center member indicated by 14 in FIG. 2, which will be described later, is located on the inner side of the filament yarn traveling path when viewed from the filament yarn traveling path direction, in other words, the innermost filament thread traveling path This is because it is easy to dispose the central member inside the peripheral surface, and it is easy to dispose the central member with a sufficient size.

  This embodiment is not particularly limited by the cooling start distance QTD, and is suitable for various cooling start distances. Although it is not particularly limited, for example, when the cooling start distance is shortened by arranging the upper end of the airflow blowing surface close to the lower surface of the spinneret toward the upstream side in the traveling direction of the filament yarn, From the further upstream side of the filament yarn traveling path direction, air resistance acting on each single yarn of the filament yarn can be suppressed, airflow around each single yarn can be rectified, and the like. By shortening the cooling start distance, each filament yarn is particularly sharply thinned, the yarn speed is rapidly increased, and tension and stress are likely to increase rapidly due to air resistance, etc. The scope of application of this embodiment is further expanded in the direction of the upstream area of the filament yarn traveling path direction, which is susceptible to the influence of the airflow, etc. This is because air resistance acting on each single yarn of the filament yarn can be suppressed and airflow around each single yarn can be rectified from the further upstream side in the traveling path direction of the filament yarn. This is because after spinning from the spinneret, it tends to solidify rapidly in the vicinity of the spinneret, and the stress acting on each single yarn of the filament yarn tends to increase until it is almost solidified. High function, such as filament yarns made into a single filament, modified filament yarns, filament yarns modified with thermoplastic polymers, filament yarns composed of special thermoplastic polymers such as high glass transition temperature, etc. This is particularly effective for filament yarns. In addition, when shortening the cooling start distance, a high temperature air current, for example, around the glass transition temperature Alternatively, the present embodiment is suitable even when a high-temperature airflow higher than the glass transition temperature is used. This embodiment is particularly limited by the form in which the upper end of the airflow blowing surface, the upper end of the inner surface of the upstream member of the cooling means, and the like are brought close to the lower surface H3 of the spinneret toward the upstream side in the traveling direction of the filament yarn. Absent. Although this embodiment is not particularly limited, the upper end of the airflow blowing surface and the upper end of the inner surface of the upstream member of the cooling means are close to the lower surface H3 of the spinneret toward the upstream side in the filament yarn traveling path direction. The upper end of the airflow blowing surface, the upper end of the inner surface of the upstream member of the cooling means, or the upper end of the airflow blowing portion 6 (the upper end on the upstream side in the travel path of the filament yarn of the airflow blowing portion) or the cooling means The upstream member or the like may be brought into contact with a spinneret, a spin pack, a spin block, their members, or other members connected to them, or may be brought into contact and sealed there. I can't.

Next, a further preferred embodiment of the first important embodiment of the present embodiment will be described. A further preferred embodiment of the first important embodiment of the present embodiment is, for example, as shown in FIG. 2, in the filament yarn traveling path as viewed from the filament thread traveling path direction. A central member extending in the traveling path direction and having a circular cross-sectional shape in a direction perpendicular to the traveling path direction of the filament yarn on the outer surface is provided, and the air flow blowout of the cooling means in the traveling path direction of the filament yarn From the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the surface, in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the outer surface of the central member The cross-sectional area obtained by subtracting the cross-sectional area of the cross-section gradually decreases from the upstream side in the traveling path direction of the filament yarn toward the downstream side, so that the central member An apparatus for manufacturing a filament yarn according to the first important embodiment of the present embodiment, wherein the disposing side.
Here, FIG. 2 is a schematic diagram of a longitudinal section schematically illustrating an example of a preferred melt spinning configuration according to one example of the present embodiment, and one embodiment of the present embodiment schematically illustrated in FIG. It is the schematic of the longitudinal cross-section which illustrated typically an example of the structure at the time of applying the center member 14 to an example of the structure of the preferable melt spinning which concerns on an example. In FIG. 2, reference numeral 14 denotes a central member (portion filled with dots in the drawing), and d denotes an outer side of the filament yarn on the outer surface in a direction perpendicular to the filament yarn traveling path direction at a certain position in the filament thread traveling path direction. The other symbols in FIG. 2 are the same as those in FIG. Hereinafter, the outer diameter of the outer surface of the central member at a certain position in the traveling path direction of the filament yarn in the direction perpendicular to the traveling path direction of the filament yarn is defined as the outer diameter of the outer surface of the central member at the certain position in the traveling path direction of the filament yarn. It will be referred to as the outer diameter or simply the outer diameter of the outer surface of the central member. Moreover, in FIG. 2, although illustration of the support member of a center member is abbreviate | omitted, of course, you may provide. In a further preferred embodiment of the first important embodiment of the present embodiment, the inner side of the filament yarn traveling path as viewed from the filament yarn traveling path direction, in other words, the innermost circumference of the filament yarn traveling path. Indicates the inside of the face.

  Details of the features and effects of the further preferred embodiment of the first important embodiment of the present embodiment will be described. First, in a further preferred embodiment of the first important embodiment of the present embodiment, it extends in the traveling path direction of the filament yarn inside the traveling path of the filament yarn as viewed from the traveling path direction of the filament yarn, A central member having a circular cross-sectional shape in a direction perpendicular to the traveling path direction of the filament yarn on the outer side surface is provided, and the filament yarn travels in the region surrounded by the air flow blowing surface of the cooling means in the traveling path direction of the filament yarn. The cross-sectional area obtained by subtracting the cross-sectional area in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the outer surface of the central member from the cross-sectional area in the direction perpendicular to the path direction is the traveling distance of the filament yarn. The outer surface of the central member is disposed so as to gradually decrease from the upstream side in the path direction toward the downstream side. For this reason, in the region surrounded by the airflow blowing surface of the cooling means, the region surrounded by the outer surface of the central member is subtracted from the region surrounded by the airflow blowing surface of the cooling means. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region where each single yarn can travel is small, and each filament yarn in the region surrounded by the airflow blowing surface of this cooling means travels. In the possible region, the flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn of the airflow can be increased, and the relative speed between each single yarn of the filament yarn and the airflow is set to the first speed of this embodiment. It can be made even smaller than the important embodiment. In addition, in the region surrounded by the airflow blowing surface of the cooling means, each single yarn of the filament yarn travels by subtracting the region surrounded by the outer surface of the central member from the region surrounded by the airflow blowing surface of the cooling means. Since the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the possible region is gradually decreased from the upstream side to the downstream side in the traveling path direction of the filament yarn, The flow velocity in the direction from the upstream side of the filament yarn traveling path direction to the downstream side in the region where each filament yarn of the enclosed region can travel is changed from the upstream side to the downstream side in the filament yarn traveling path direction. Can be gradually increased toward the downstream side in the traveling direction of the filament yarn until it is spun from the spinneret and solidified, and the yarn speed continues to increase. In accordance with each single yarn of filament yarn, the relative velocity between the respective single yarn and airflow filament yarn can be reduced. As a result, the more preferable embodiment of the first important embodiment of the present embodiment is more effective than the first important embodiment of the present embodiment in the air resistance acting on each single yarn of the filament yarn and the tension due to this air resistance. And the stress can be further easily suppressed, and the quality of the filament yarn, such as strong elongation, elongation, and strength, can be further improved.

  Secondly, in a further preferred embodiment of the first important embodiment of the present embodiment, the filament yarn travels in the filament yarn travel path as viewed from the filament yarn travel path direction. A central member having a circular cross-sectional shape in a direction perpendicular to the traveling path direction of the filament yarn on the outer surface is provided. For this reason, utilizing the central member, in the region surrounded by the airflow blowing surface of the cooling means, the region surrounded by the outer surface of the central member is subtracted from the region surrounded by the airflow blowing surface of the cooling means, The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region where each filament yarn can travel is gradually reduced from the upstream side to the downstream side in the traveling path direction of the filament thread. For example, a mode in which the filament yarn is gradually decreased, or perpendicular to the filament yarn traveling path direction in an area where each filament yarn can travel from the upstream side to the downstream side in the filament yarn traveling path direction. Such as the size of the reduction rate that gradually reduces the cross-sectional area of the cross-section in any direction and the distribution of the size of the reduction rate from the upstream side to the downstream side of the filament yarn traveling path direction. It is possible to further expand. Therefore, for example, the outer diameter of the outer surface of the central member is arranged so as to gradually increase from the upstream side in the traveling path direction of the filament yarn to the downstream side in the traveling path direction of the filament yarn of the central member. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region where each single yarn of the filament yarn can travel is set to be larger than the first important embodiment of the present embodiment. It is easy to make it small on the upstream side in the traveling direction of the filament yarn. As a result, a more preferable embodiment of the first important embodiment of the present embodiment is more preferable than the first important embodiment of the present embodiment in the filament yarn in the region where each filament yarn can run. The cross-sectional area in the direction perpendicular to the traveling path direction is gradually reduced from the upstream side to the downstream side in the traveling path direction of the filament yarn. For example, after spinning from a spinneret, spinning is performed. It is easy to solidify rapidly in the vicinity of the base, and the stress acting on each single yarn of the filament yarn is likely to increase until it is almost solidified. High-function filament yarn such as filament yarn, filament yarn modified with thermoplastic polymer, or filament yarn composed of special thermoplastic polymer such as high glass transition temperature In addition, the air resistance acting on each single yarn of the filament yarn, the increase in tension due to this air resistance, the stress can be sufficiently suppressed, and the filament yarn's strong elongation and It also has the feature that quality such as elongation and strength can be further improved.

  Thirdly, in a further preferred embodiment of the first important embodiment of the present embodiment, in the region surrounded by the airflow blowing surface of the cooling means, from the region surrounded by the airflow blowing surface of the cooling means, Subtracting the area surrounded by the outer surface of the central member, the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the area where each filament yarn can travel can be reduced. In the region where each filament yarn can travel with an airflow of a smaller flow rate blown from the airflow blowing surface than in the important embodiment 1, the upstream side in the traveling path direction of the filament yarn of the airflow from the upstream side It is easy to increase the flow velocity in the direction toward the direction and decrease the relative speed between each single yarn of the filament yarn and the airflow. In addition, in the upstream of the filament yarn traveling path direction, more upstream than the first important embodiment of the present embodiment, the filament yarn in the traveling path direction of the filament yarn in the region where each filament yarn can travel. It is easy to increase the flow velocity in the direction from the upstream side to the downstream side with an air flow having a smaller flow rate blown out from the air flow blowing surface. As a result, a more preferred embodiment of the first important embodiment of the present embodiment is that the air acting on each single yarn of the filament yarn with a smaller airflow than the first important embodiment of the present embodiment. The resistance and the tension due to this air resistance, the stress can be sufficiently suppressed, and the energy required for supplying the airflow can be further reduced, thus further saving energy and reducing the production cost of the filament yarn. It also has the feature of being able to.

  This embodiment is surrounded by the outer surface of the central member from the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means in the traveling path direction of the filament yarn. The outer area of the central member is adjusted so that the cross-sectional area obtained by subtracting the cross-sectional area of the region in the direction perpendicular to the traveling path direction of the filament yarn in the region gradually decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn. By the form which arrange | positions a side surface, in the range which satisfies the 1st important embodiment of this embodiment mentioned above, its more preferable embodiment, and the 2nd important embodiment of this embodiment mentioned later, it does not restrict | limit in particular. In addition, in the region surrounded by the airflow blowing surface of the cooling means, the filament is obtained by subtracting the region surrounded by the outer surface of the central member from the region surrounded by the airflow blowing surface of the cooling means. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region where each single yarn of the thread can travel is gradually reduced from the upstream side to the downstream side in the traveling path direction of the filament thread. By the form which arrange | positions the outer surface of a center member, in the range which satisfies the 1st important embodiment of this embodiment mentioned above, its more preferable embodiment, and the 2nd important embodiment of this embodiment mentioned later. However, the present embodiment is not particularly limited, and the present embodiment is suitable for various forms. For example, the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means is surrounded by the outer surface of the central member within a range that does not impair the stability of yarn production. From the area surrounded by the airflow blowing surface of the cooling means in the cross-sectional area obtained by subtracting the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the area, or the area surrounded by the airflow blowing face of the cooling means, The cross-sectional area of the cross section in the direction perpendicular to the travel path direction of the filament yarn in the area where each filament yarn can travel is subtracted from the area surrounded by the outer surface of the central member. The outer surface of the central member may be arranged so as to gradually become smaller from the upstream side toward the downstream side or gradually, or the cross-sectional area may be the filament yarn traveling path. In the process of disposing the outer surface of the central member so as to gradually decrease from the upstream side toward the downstream side, the cross-sectional area is gradually increased from the upstream side to the downstream side in the traveling direction of the filament yarn. The present embodiment is suitable even if the reduction ratio at which the cross-sectional area is gradually reduced is partially changed from the upstream side to the downstream side in the traveling direction of the filament yarn. The filament yarn in the region surrounded by the outer surface of the central member from the cross-sectional area of the cross section in the direction perpendicular to the traveling route direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means in the traveling route direction of the filament yarn The outer surface of the central member is arranged so that the cross-sectional area obtained by subtracting the cross-sectional area in the direction perpendicular to the traveling path direction of the filament yarn gradually decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn. In the form surrounded by the air flow blowing surface of the cooling means, each unit of the filament yarn obtained by subtracting the area surrounded by the outer surface of the central member from the area surrounded by the air flow blowing surface of the cooling means. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the region where the yarn can travel gradually decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn. In this way, the form of disposing the outer surface of the central member is not particularly limited, but the cross-sectional area of the central member gradually decreases from the upstream side to the downstream side in the traveling direction of the filament yarn. In the process of arranging the outer surface, the reduction rate for gradually reducing the cross-sectional area from the upstream side in the traveling path direction of the filament yarn to the upstream side in the traveling path direction of the filament yarn is increased. Further, it is preferable to dispose the outer surface of the central member. Corresponding to the upstream region in the filament yarn travel path direction, where each filament yarn is rapidly thinned, the yarn speed is increased rapidly, and tension and stress are likely to increase rapidly due to air resistance. This is because the air resistance acting on each single yarn of the filament yarn and the increase in the tension due to the air resistance can be sufficiently suppressed and the stress can be sufficiently suppressed more effectively. This form is easy to solidify rapidly in the vicinity of the spinneret after being spun from the spinneret, and the stress acting on each single yarn of the filament yarn is likely to increase until it is almost solidified. -Filament yarns made into multifilaments, single yarns with irregular cross-sections, filament yarns modified with thermoplastic polymers, filament yarns composed of special thermoplastic polymers such as high glass transition temperature, etc. This is particularly effective for high-performance filament yarns. In addition, each single yarn of the filament yarn is not easily thinned rapidly in the region downstream of the filament yarn traveling path direction, and the yarn speed is also difficult to increase rapidly. The reduction ratio that gradually decreases from the upstream side in the path direction to the downstream side is sharply reduced so that the yarn speed is increased rapidly on the upstream side in the travel path direction of the filament yarn, where the yarn speed tends to increase rapidly. It is also possible to reduce the speed on the downstream side of the filament yarn traveling path direction, where the yarn speed is difficult to increase rapidly. That is, the reduction ratio for gradually decreasing the cross-sectional area from the upstream side in the filament yarn traveling path direction toward the downstream side becomes larger on the upstream side in the filament yarn traveling path direction. You may arrange | position the outer surface of a center member so that it may become small in the downstream of a path | route direction.

  This embodiment is provided on the inside of the filament yarn traveling path as viewed from the filament yarn traveling path direction, in other words, on the innermost peripheral surface of the filament yarn traveling path, and extends in the filament yarn traveling path direction. By the central member having a circular cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the outer side surface, the first important embodiment of the present embodiment described above, a more preferable embodiment thereof, and a later-described embodiment of the present embodiment will be described. As long as the second important embodiment is satisfied, the present invention is not particularly limited and is suitable for various central members. The number, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finishing, surface treatment, structure It is not particularly limited by the member configuration, material, etc.

  The cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface of the central member is preferably circular as in the more preferred embodiment of the first important embodiment of the present embodiment. Each filament yarn is easy to cool uniformly in the circumferential direction surrounding the filament yarn traveling path, and easy to supply air current to each filament yarn evenly in the circumferential direction. In the region surrounded by the airflow blowing surface of the cooling means, each single yarn of the filament yarn can run by subtracting the region surrounded by the outer surface of the central member from the region surrounded by the airflow blowing surface of the cooling means. This is because, for example, the flow velocity in the direction from the upstream side to the downstream side in the travel path direction of the filament yarn of the airflow in a region is easily uniform in the circumferential direction. Therefore, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface of the central member is preferably circular, but is not particularly limited. For example, the cross section in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface of the central member This embodiment is suitable even if the shape is an ellipse, a polygon, or a shape close to it within a range that does not deviate extremely from a circle. In addition, this embodiment is suitable and different even if the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface of the central member is partially different within a range that does not deviate extremely from the circular shape. It is also preferable that there are a single portion, a plurality of portions, or a plurality of portions. In addition, this embodiment is suitable even if the cross-sectional shape of the outer surface of the central member in the direction perpendicular to the traveling path direction of the filament yarn is changed singly, plurally or plurally along the traveling path direction of the filament yarn. . When the cross-sectional shape of the outer surface of the central member in the direction perpendicular to the filament yarn traveling path direction is an ellipse, a polygonal shape, or a shape close to it within a range that does not deviate extremely from the circular shape, the outer surface of the central member The outer diameter of the outer surface of the central member, which is the outer diameter in the direction perpendicular to the traveling path direction of the filament yarn, is the inscribed circle of the cross section in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface of the central member or The diameter of the circumscribed circle applies.

  This embodiment satisfies the above-described first important embodiment of the present embodiment, a more preferable embodiment thereof, and a second important embodiment of the present embodiment described later, depending on the outer diameter of the outer surface of the central member. The range is not particularly limited, and is suitable for the form of the outer diameter of the outer surface of various central members. For example, the outer diameter of the outer side surface of the central member is within a range satisfying the first important embodiment of the present embodiment described above, a more preferable embodiment thereof, and a second important embodiment of the present embodiment described later. However, it is not particularly limited, and there may be almost no change from the upstream side to the downstream side in the traveling path direction of the filament yarn, and it may be gradually increased or gradually decreased from the upstream side in the traveling path direction of the filament yarn toward the downstream side. In addition, there may be one or a plurality or a plurality of types of increases and decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn. Further, for example, the increase, decrease, increase, or decrease gradually from the upstream side to the downstream side in the filament yarn traveling path direction may be performed continuously or stepwise, or the filament yarn traveling path direction. In the process of gradually increasing, gradually decreasing, increasing or decreasing from the upstream side to the downstream side, the degree of gradual increase, gradual decrease, increase or decrease may partially change. Further, for example, in the filament yarn traveling path direction, the region surrounded by the airflow blowing surface of the cooling means is surrounded by the outer surface of the central member from the cross-sectional area of the section perpendicular to the filament yarn traveling path direction. From the area surrounded by the airflow blowing surface of the cooling means in the cross-sectional area obtained by subtracting the cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the area, or the area surrounded by the airflow blowing face of the cooling means, The cross-sectional area of the cross section in the direction perpendicular to the travel path direction of the filament yarn in the area where each filament yarn can travel is subtracted from the area surrounded by the outer surface of the central member. In the process of disposing the outer surface of the central member so that it gradually decreases from the upstream side to the downstream side, the filament yarn travels from the upstream side to the downstream side in the traveling path direction. The outer diameter of the outer surface of the central member is set upstream of the filament yarn traveling path direction of the central member so that the reduction ratio for gradually reducing the cross-sectional area increases on the upstream side of the filament yarn traveling path direction. , The filament yarn may be disposed so as to gradually increase from the upstream side to the downstream side in the traveling path direction. Further, for example, the outer diameter of the outer surface of the central member is arranged so as to gradually increase from the upstream side in the traveling path direction of the filament yarn to the downstream side in the traveling path direction of the filament yarn of the central member. And may be disposed so as to gradually decrease from the upstream side in the traveling path direction of the filament yarn toward the downstream side in the traveling path direction of the filament yarn of the central member. In addition, for example, this embodiment is suitable even if the outer diameter of the outer surface of the central member is changed singly, plurally, or plurally along the traveling path direction of the filament yarn. In addition, for example, further improvement of the filament yarn's strength, elongation, strength, etc., reduction of the airflow blown out from the airflow blowing surface, further energy saving and reduction of filament yarn manufacturing costs, etc. Aiming to increase the outer diameter of the outer surface of the central member, the region surrounded by the airflow blowing surface of the cooling means is surrounded by the outer surface of the central member from the region surrounded by the airflow blowing surface of the cooling means. The cross-sectional area of the cross section in the direction perpendicular to the traveling path direction of the filament yarn in the area where each filament yarn can travel is reduced, and the area surrounded by the air flow blowing surface of the cooling means is reduced. The flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn in the airflow in the region where each single yarn of the filament yarn can travel may be easily increased.

  In the present embodiment, the outer shape of the central member and the like satisfy the first important embodiment of the present embodiment, a more preferable embodiment thereof, and a second important embodiment of the present embodiment described later. It is not particularly limited, and is suitable for forms such as the outer diameter shape of various central members. For example, as long as the first important embodiment of the present embodiment and the more preferable embodiment thereof and the second important embodiment of the present embodiment to be described later are satisfied, the central member and the filament yarn of the central member The outer diameter of the cross section in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface is increased or reduced from the upstream side to the downstream side in the traveling path direction of the filament yarn, such as on the upstream side or the downstream side in the traveling path direction. One or a plurality of taper shapes may be provided. Further, for example, the present embodiment is suitable even if a heat insulating member, a heat retaining member, a heating member, a cooling member, a heating unit, a cooling unit, a measuring unit such as a temperature, and the like are provided in the central member. Also, for example, with the aim of suppressing cooling spots and yarn swaying, a surface in the direction perpendicular to the traveling path direction of the filament yarn on the downstream side of the traveling path direction of the filament yarn of the central member, or a filament thread on the outer surface thereof The outer surface of the cross section in the direction perpendicular to the traveling path direction is provided with, for example, a tapered surface that decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn. An air flow blowing surface that blows an air flow from the upstream side toward the downstream side in the traveling path direction of the filament yarn may be disposed on the surface or the like. On the other hand, for example, on the upstream side of the filament yarn in the traveling path direction of the central member, the cross section in the direction perpendicular to the traveling path direction of the filament yarn on the upstream side of the filament yarn or the cross section in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface For example, a taper-shaped surface whose outer diameter decreases from the downstream side to the upstream side in the filament yarn traveling path direction is provided, and the filament yarn traveling path direction is provided on the surface in the vertical direction or the tapered surface. An air flow blowing surface that blows out an air flow from the downstream side to the upstream side of the filament yarn may be disposed, and the central member has a circular cross section in a direction perpendicular to the traveling route direction of the filament yarn, and the traveling route of the filament yarn An air flow blowing surface that extends in the direction and blows the air flow outward from the inner peripheral side of the filament yarn traveling path may be disposed, and is not particularly limited. Further, it is preferable that the central member is composed of a single member or plural or plural kinds of central members, and it is also preferable that a single member or plural or plural kinds of central members are provided in the cooling means. Even if a single member, a plurality of members, or a plurality of members are provided for a plurality or a plurality of types of spinnerets or spin packs, this embodiment is suitable.

  This embodiment is within a range that satisfies the first important embodiment of the present embodiment described above, a more preferable embodiment thereof, and a second important embodiment of the present embodiment described later, depending on the mounting position of the central member. It is not particularly limited, and is suitable for various forms. Moreover, this embodiment is based on the position of the upper end on the upstream side in the traveling path direction of the filament yarn of the central member and the position of the lower end on the downstream side. As long as the second important embodiment of the present embodiment to be described later is satisfied, the present invention is not particularly limited and is suitable for various forms. Hereinafter, the upper end of the central member in the traveling path direction of the filament yarn is referred to as the upper end of the central member, and the lower end of the central member in the traveling path direction of the filament yarn is referred to as the lower end of the central member. The position of the upper end of the central member is not particularly limited. For example, the upper end of the central member may be disposed on the upstream side or the downstream side in the traveling direction of the filament yarn from the upper end of the airflow blowing surface. Alternatively, the filament yarn may be disposed at the same position as the upper end of the airflow blowing surface in the traveling path direction of the filament yarn. The position of the upper end of the central member is not particularly limited, but when the upper end of the central member is disposed upstream of the upper end of the airflow blowing surface including the upper end of the airflow blowing surface in the filament yarn traveling path direction. Preferably, the outer diameter of the outer surface of the central member is upstream from the downstream side in the traveling direction of the filament yarn on the upstream side in the traveling path direction of the filament yarn from the upper end of the airflow blowing surface including at least the upper end of the airflow blowing surface. It is preferable to provide a taper that gradually decreases toward the side, and at the upstream side of the airflow blowing surface including at least the upper end of the airflow blowing surface of the central member, the filament yarn on the outer side of the upstream side in the traveling path direction of the filament yarn The outer diameter of the cross section in the direction perpendicular to the path direction should be a taper shape that decreases from the downstream side to the upstream side in the traveling path direction of the filament yarn. Alternatively, the upstream side of the travel path direction of the filament yarn from the upper end of the blowing airflow plane containing the upper end of the blowing airflow surface, it is preferable to reduce the outer diameter of the outer surface of the central member. When the upper end of the central member is arranged upstream of the upper end of the airflow blowing surface including the upper end of the airflow blowing surface in the traveling direction of the filament yarn, for example, from the upper end of the airflow blowing surface including the upper end of the airflow blowing surface The outer diameter of the outer surface of the central member on the upstream side in the traveling path direction of the filament yarn is provided so as to hardly change or gradually increase from the downstream side to the upstream side in the traveling path direction of the filament yarn, or When the outer diameter of the outer surface of the central member is increased upstream of the upper end of the airflow blowing surface including the upper end of the airflow blowing surface in the traveling path direction of the filament yarn, the airflow blowing including the upper end of the airflow blowing surface of the central member The upstream side of the filament yarn travel path direction from the upper end of the surface is obstructive, and the filament yarn travel path direction from the upper end of the airflow blowing surface The non-traveling area of the filament yarn inside the filament yarn traveling path as viewed from the upstream side of the filament yarn traveling path becomes narrower, and the airflow blowing surface upstream of the airflow blowing surface in the direction of the filament yarn upstream. Airflow supply to the area near the lower surface of the spinneret that cannot receive direct airflow supply from the airflow is blown out from the airflow blowing surface, and each filament yarn is directed from the outer circumference side to the inner circumference side of the filament yarn travel path. The airflow that has passed through the filament yarn travels in the form of rising from the downstream side to the upstream side in the filament yarn travel path direction as viewed from the filament yarn travel path direction. Supply airflow directly from the airflow blowing surface upstream of the upper end of the airflow blowing surface in the direction of the filament yarn travel path. The airflow supplied to the area near the lower surface of the spinneret that cannot be received is that the airflow blown from the upstream side of the airflow blowing surface, particularly the filament yarn on the airflow blowing surface, in the traveling direction of the filament yarn, It becomes easy to carry out in the form of rising and flowing into the region near the lower surface of the spinneret through the flow path between the outermost peripheral surface of the travel path. As a result, due to the upward flow from between this air flow blowing surface and the outermost peripheral surface of the filament yarn traveling path, each single yarn on the outer peripheral side of the filament yarn traveling path is compared with each single yarn on the inner peripheral side, It becomes easy to be strongly cooled from the upstream side in the traveling path direction of the filament yarn, and this makes it easy to generate cooling spots and yarn fluctuations. Therefore, when the upper end of the central member is disposed upstream of the upper end of the airflow blowing surface including the upper end of the airflow blowing surface in the traveling direction of the filament yarn, as described above, the airflow including at least the upper end of the airflow blowing surface It is preferable that the outer diameter of the outer surface of the central member is provided so as to gradually decrease from the downstream side in the traveling path direction of the filament yarn toward the upstream side in the upstream direction in the traveling path direction of the filament yarn from the upper end of the blowing surface. In the case where the upper end of the central member is disposed upstream of the upper end of the airflow blowing surface including the upper end of the airflow blowing surface in the direction of travel of the filament yarn, the outer diameter of the outer surface of the central member is When gradually decreasing from the downstream side in the traveling path direction toward the upstream side, of course, it may be gradually decreased from the downstream side in the traveling path direction of the filament yarn from the upper end of the airflow blowing surface, and the filament yarn from the upper end of the airflow blowing surface. The outer diameter of the cross section in the direction perpendicular to the traveling path direction of the filament yarn on the outer surface of the central member from the downstream side in the traveling path direction of the filament yarn of the central member is the traveling path direction of the filament thread. The taper shape may be reduced from the downstream side toward the upstream side, or may be lower than the upper end of the airflow blowing surface in the direction of the filament yarn traveling path. From the side may reduce the outer diameter of the outer surface of the central member. In addition, the outer diameter of the outer surface on the upstream side in the traveling path direction of the filament yarn of the central member hardly changes from the downstream side in the traveling path direction of the filament yarn toward the upstream side, or is gradually increased. Alternatively, when the outer diameter of the upstream outer surface of the central member in the traveling direction of the filament yarn is large, the upper end of the central member is preferably arranged downstream of the upper end of the air flow blowing surface in the traveling direction of the filament yarn. It is good to arrange on the side. The reason is the same as above. Further, the position of the lower end of the central member is particularly limited as long as the first important embodiment of the present embodiment and the more preferable embodiment thereof and the second important embodiment of the present embodiment described later are satisfied. For example, the lower end of the central member may be disposed on the upstream side or the downstream side in the filament yarn traveling path direction from the lower end of the air flow blowing surface, or in the filament yarn traveling path direction, You may arrange | position in the same position as the lower end of an airflow blowing surface. Alternatively, the lower end of the central member may be arranged on the upstream side or the downstream side in the filament yarn traveling path direction from the downstream lower end in the filament yarn traveling path direction of the cooling means, or the filament You may arrange | position in the traveling path direction of a thread | yarn in the same position as the downstream lower end of the traveling path direction of the filament thread | yarn of a cooling means.

  In the present embodiment, the support member of the central member satisfies the first important embodiment of the present embodiment and the more preferable embodiment thereof and the second important embodiment of the present embodiment described later. It is not particularly limited and is suitable for supporting members of various central members, and is particularly limited by the number, outer shape, outer dimensions, mounting position and orientation, surface shape, surface finish, surface treatment, structure, member configuration, material, etc. Absent. For example, the support member of the central member may be an upstream member or downstream member in the filament yarn traveling path direction of the cooling means, or an upstream member in the filament yarn traveling path direction, such as a spinneret. May be provided from a member on the downstream side of the filament yarn traveling path direction, such as a means for applying, bundling, guiding, and guiding the thread oil agent, or an airflow blowing surface or an airflow blowing portion or an airflow blowing surface or an airflow You may provide from the non-blowing part etc. which were provided in the blowing part. Further, an airflow pipe for supplying airflow or the like may be provided on the support member of the central member. In this embodiment, the cross-sectional area in the direction perpendicular to the traveling path direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means is gradually increased from the upstream side to the downstream side in the traveling path direction of the filament yarn. Or the cross-sectional area of the section perpendicular to the traveling direction of the filament yarn in the region surrounded by the airflow blowing surface of the cooling means in the traveling direction of the filament yarn, surrounded by the outer surface of the central member The central member is such that the cross-sectional area obtained by subtracting the cross-sectional area of the filament yarn in the direction perpendicular to the traveling path direction of the filament yarn gradually decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn. In the form in which the outer side surface is disposed, or in the region surrounded by the airflow blowing surface of the cooling means, the outer surface of the central member is removed from the region surrounded by the airflow blowing surface of the cooling means. The cross-sectional area of the cross section in the direction perpendicular to the traveling direction of the filament yarn in the region where each single yarn of the filament yarn can travel is subtracted from the area surrounded by the surface, and is downstream from the upstream side in the traveling direction of the filament yarn. Of course, in the configuration in which the outer surface of the central member is disposed so as to gradually become smaller toward the side, the cross-sectional area of the cross section perpendicular to the filament yarn traveling path direction of the supporting member of the central member is of course considered. Good but not necessary to consider.

  In the further preferred embodiment of the first important embodiment of the present embodiment, although not particularly limited, preferably, for example, spinning from the center of the lower surface of the spinneret while avoiding the periphery of the center of the lower surface of the spinneret. Dispose the discharge holes in the outer peripheral area of the lower surface of the spinneret or provide a non-arrangement area in which the discharge holes are not arranged around the center of the lower surface of the spinneret. By arranging the discharge holes in the region of the filament yarn, the filament yarn is not placed inside the filament yarn running path as viewed from the filament yarn running path direction, in other words, inside the innermost peripheral surface of the filament yarn running path. It is preferable to arrange the discharge holes drilled in the spinneret so that a traveling region is formed. In addition, although not particularly limited, preferably, for example, a non-arrangement region where no discharge holes are arranged around the center of the lower surface of the spinneret is provided, and the spinneret is viewed from the center of the lower surface of the spinneret so that this region becomes larger. Spinning is performed so that the discharge holes are arranged in a region on the outer peripheral side of the lower surface of the nozzle, or the distance from the center of the lower surface of the spinneret of the discharge hole arranged on the innermost periphery when viewed from the center of the lower surface of the spinneret. The center of the lower surface of the spinneret through which the discharge holes are arranged in the region on the outer peripheral side of the lower surface of the spinneret as viewed from the center of the lower surface of the spinneret or through the discharge holes arranged in the innermost periphery as viewed from the center of the lower surface of the spinneret The filament yarn travels by arranging discharge holes in a region on the outer peripheral side of the lower surface of the spinneret as viewed from the center of the lower surface of the spinneret so that the radius or diameter of the innermost circumferential row centering on the Direction In view of this, the non-traveling area of the filament yarn inside the traveling path of the filament yarn, in other words, the non-traveling area of the filament yarn inside the innermost peripheral surface of the traveling path of the filament yarn is drilled in the spinneret. It is preferable to arrange the discharge holes. As described above, the central member is easy to be disposed on the inside of the filament yarn traveling path when viewed from the filament yarn traveling path direction, in other words, on the innermost peripheral surface of the filament yarn traveling path, and sufficient This is because the central member can be easily arranged with a large size. Further, in a further preferred embodiment of the first important embodiment of the present embodiment, for example, when the number of single yarns spun from one spinneret is singular, as viewed from the traveling path direction of the filament yarn provided with the central member. The inner region of the filament yarn traveling path, in other words, the inner region of the innermost peripheral surface of the filament yarn traveling path, for example, avoids the periphery of the center of the lower surface of the spinneret and is viewed from the center of the lower surface of the spinneret. Dispose the discharge holes in the outer peripheral area of the lower surface of the spinneret or provide a non-arrangement area in which the discharge holes are not arranged around the center of the lower surface of the spinneret. It is provided by arranging discharge holes in this area.

  Further, in the second important embodiment of the present embodiment, the filament yarn production apparatus described in the first important embodiment of the present embodiment is used to melt-spin the thermoplastic polymer, A method for producing a filament yarn is provided.

  Next, other embodiments will be described. This embodiment is not particularly limited by the configuration of melt spinning. In the melt spinning process, a low-oriented undrawn yarn (hereinafter referred to as UDY) or a partially oriented yarn (hereinafter referred to as POY: Partially Oriented Yarn) is obtained. It is also suitable for a configuration of direct spinning drawing (hereinafter referred to as DSD: Direct Spin Draw) in which Full Oriented Yarn) is obtained in one step, and a configuration corresponding to OSY (One Step Yarn) which has a high spinning speed and does not require stretching. In FIGS. 1 and 2, configurations corresponding to UDY, POY, and OSY are illustrated, but the present embodiment is not limited to this. Further, the present embodiment is not particularly limited depending on the spinning speed, and is suitable even in a range of about 300 to 10,000 m / min. In the polyester filament yarn, generally, the spinning speed is about 300 to 1800 m / min in the configuration corresponding to UDY, about 1800 to 5000 m / min in the configuration corresponding to POY, and about 300 to 1800 m / min in the configuration of DSD (in addition, The winding speed is about 2000 to 5000 m / min), and the configuration corresponding to OSY is about 3000 to 10000 m / min, but the above is only an example, and is composed of polyester or other thermoplastic polymer Even if the spinning speed of the filament yarn is UDY, POY, DSD, or OSY exceeding the above speed range, this embodiment is suitable.

  This embodiment is not particularly limited by the thermoplastic polymer constituting the filament yarn 10, and is also suitable for polyester, polyamide, polyphenylene, polyolefin, polystyrene, polyketone, cellulose ester-based thermoplastic polymer containing a plasticizer, and the like. It is suitable for chemical fibers such as synthetic fibers and semi-synthetic fibers spun by spinning. Examples of polyesters suitable for this embodiment include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polylactic acid, polyethylene naphthalate, polybutylene naphthalate, polypropylene terephthalate, and the like. Examples of polyamides include nylon 6 and nylon 66. The present embodiment is also suitable for copolymerized polyamide. Examples of polyphenylene include polyphenylene sulfide, examples of polyolefin include polyethylene, polypropylene, and polystyrene include polystyrene.

  Moreover, this embodiment is suitable even if other copolymerization components are contained in the thermoplastic polymer in the range which does not impair the spinning stability. An example of polyester is a polyester cation dyeable yarn that can be dyed with excellent sharpness, and this embodiment is also used in the case where sodium sulfonate isophthalic acid or polyethylene glycol that are generally copolymerized is included. Is preferred. Further, matting agents such as titanium dioxide, silicon oxide, kaolin, anti-coloring agents, stabilizers, antioxidants, deodorants, flame retardants, yarn friction reducing agents, coloring pigments, as long as the yarn-making stability is not impaired. It is suitable even if various functional particles such as surface modifiers and additives such as organic compounds are contained.

  In addition, the present embodiment is not particularly limited by the component configuration of each single yarn of the filament yarn 10. The component constituting each single yarn may be singular or plural. For example, a composite configuration such as a core-sheath type composite, a sea-island type composite, or a side-by-side type composite is suitable. Moreover, it is also suitable for a structure such as an alloy or blend in which a plurality of components are mixed. It is also preferable that each composite component is composed of a plurality of components such as alloys and blends.

  This embodiment is not particularly limited by the number of single yarns of the filament yarn 10, and is also suitable for monofilament yarns and multifilament yarns. Moreover, it is also suitable for filament yarns having several thousand yarns, for example, about 2000, as in the field of staples. In the fields of apparel and industrial use other than staples, there are many filament yarns in the range of 1 to 1000 or 1 to 600 single yarns. In addition, the present embodiment is not particularly limited by the single yarn fineness of each single yarn of the filament yarn 10, and is preferably in the range of about 0.1 to several hundred dtex. Dtex indicates decitex. For example, it is also suitable for filament yarns having a single yarn fineness after melt spinning of about 0.1 to 16 dtex, 0.1 to 10 dtex, or 0.1 to 3.5 dtex. In addition, the smaller the single yarn fineness, the more easily the difference from conventional techniques such as a conventional method such as a Uniflow cooling means. In addition, after melt spinning, the obtained filament yarn is further stretched to about 1.7 to 6 times, or about 1.2 to 2 times, or drawn / false twisted, etc. The filament yarn has a single yarn fineness of 0.1 to 2.6 dtex, or 0.1 to 1.6 dtex, and 0.1 to 1.1 dtex. Further, the present embodiment is not particularly limited by the cross-sectional shape of each single yarn of the filament yarn 10, and is a round cross-section, a polygonal cross-section such as an ellipse or a triangle, a multi-leaf cross-section such as a six-leaf, an elliptic multi-leaf cross-section such as an ellipse eight-leaf. It is also suitable for character-type cross sections such as C-type, Y-type, and cross-shaped, cross-sections having hollow portions, and cross sections close to these.

  This embodiment is not particularly limited by the number of filament yarns 10 spun from the spinneret 1, and may be one or more. For example, it is suitable even if the number of yarns is 1-8 yarns, 1-6 yarns, or 1-4 yarns. In addition, it is also preferable that a filament yarn or a single yarn, which is a combination of the above-described forms related to the filament yarn or the single yarn, is spun. This embodiment is suitable even when a plurality of types of filament yarns and single yarns are spun.

  This embodiment is not particularly limited by the spinneret 1. It is suitable for various spinnerets, and is not particularly limited by the number of spinnerets, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finish, surface treatment, structure, member configuration, material, and the like. Further, the present invention is not particularly limited by the discharge hole formed in the spinneret 1. It is suitable for various discharge holes, and is not particularly limited by the number of discharge holes, outer shape, outer dimensions, hole diameter, hole length, surface shape, surface finish, surface treatment, structure, member configuration, material, and the like. In the present embodiment, the lower surface of the spinneret is entirely the lower surface of the spinneret, which is a surface in the direction perpendicular to the traveling path direction of the filament yarn, downstream of the traveling path direction of the filament yarn of the spinning nozzle. Even if there are irregularities or curved surfaces on the lower surface of the spinneret, the entire lower surface of the spinneret including them is shown.

  This embodiment is not particularly limited by the arrangement of the discharge holes formed in the spinneret 1. It is suitable for various arrangements, and is suitable for various arrangements such as a circumferential arrangement, a lattice arrangement, and a staggered arrangement. In addition, an arrangement in which a non-perforated portion in which a discharge hole is not partially perforated or a plurality of filament yarns spun from a spinneret are separated into individual yarns as long as quality, yarn-stabilization stability, etc. are not impaired. Therefore, it is also suitable for an arrangement in which separation bands are provided, an arrangement in which the distribution of the number of ejection holes is densely provided, and the like. Further, it is also suitable for an arrangement in which the density of the non-perforated portion, the separation band, and the perforated portion is provided in accordance with the arrangement of the support member of the central member. Further, it is also suitable for non-perforated portions, separation bands, arrangements where the number of perforations is singular or plural or plural types. In FIGS. 1 and 2, the filament yarn 10 is shown by several straight lines, but this shows only how the filament yarn is spun, and the number of filament yarns and the number of yarns are shown. The embodiment of the present invention is not limited to this, and is not intended to limit the form of the filament yarns, the state of deflection, the state of deflection, the number of discharge holes arranged, the form of arrangement, and the like. The present embodiment is not particularly limited by the arrangement of the discharge holes drilled in the spinneret 1. For example, particularly when there are a plurality of single yarns spun from one spinneret, it is preferable to use filament yarns. The filament yarn is spun in the direction perpendicular to the filament yarn travel path direction from the upstream side to the downstream side of the filament yarn travel route direction. It is preferable to arrange the discharge holes drilled in the spinneret so as to be close to the air flow blowing surface, the inner surface of the upstream member of the cooling means, etc., as long as they do not interfere with the exit and running. This is because, for example, the discharge holes arranged on the outermost periphery as viewed from the center of the lower surface of the spinneret and the discharge holes arranged on the innermost periphery are arranged on the outer peripheral side of the lower surface of the spinneret when viewed from the center of the lower surface of the spinneret. Arrange the discharge holes arranged on the outermost periphery as viewed from the center of the lower surface of the spinneret or the discharge holes arranged on the innermost circumference, or the distance from the center of the lower surface of the spinneret, or spin The radius or diameter of the outermost circumferential row centered on the center of the lower surface of the spinneret passing through the discharge holes arranged on the outermost periphery as viewed from the center of the lower surface of the base, and the spinneret of the spinneret passing through the discharge holes arranged on the innermost circumference This is performed by arranging the innermost circumferential row centering on the lower surface so that the radius or diameter is increased. Further, the present embodiment is not particularly limited by the arrangement of the discharge holes drilled in the spinneret. For example, particularly when the number of single yarns spun from one spinneret is plural, preferably the filament yarn It is preferable to arrange discharge holes drilled in the spinneret so that a non-running region of the filament yarn is formed inside the innermost circumferential surface of the running path. For example, discharge holes are arranged in a region on the outer peripheral side of the lower surface of the spinneret as viewed from the center of the lower surface of the spinneret avoiding the periphery of the center of the lower surface of the spinneret, or the discharge holes are disposed around the center of the lower surface of the spinneret. A non-arrangement region where no nozzles are arranged is provided, and discharge holes are arranged in a region on the outer peripheral side of the lower surface of the spinneret as viewed from the center of the lower surface of the spinneret. Further, the present embodiment is not particularly limited by the arrangement of the discharge holes drilled in the spinneret. For example, particularly when the number of single yarns spun from one spinneret is plural, preferably the filament yarn It is preferable to arrange the discharge holes drilled in the spinneret so that the non-running region of the filament yarn inside the innermost circumferential surface of the running path becomes large. This is because, for example, a non-arrangement region where the discharge holes are not arranged around the center of the lower surface of the spinneret is provided, and the region on the outer peripheral side of the lower surface of the spinneret is viewed from the center of the lower surface of the spinneret so that this region becomes larger. Spinners as viewed from the center of the bottom surface of the spinneret so that the distance from the center of the bottom surface of the spinneret is larger than the center of the bottom surface of the spinneret. The innermost circumferential row centering on the center of the lower surface of the spinneret that arranges the discharge holes in the region on the outer peripheral side of the lower surface of the base, or passes through the discharge holes arranged in the innermost periphery when viewed from the center of the lower surface of the spinneret This is performed by arranging discharge holes in a region on the outer peripheral side of the lower surface of the spinneret as viewed from the center of the lower surface of the spinneret so that the radius or diameter of the spinneret is increased. As described above, the direction that is perpendicular to the direction of the filament yarn travels from the upstream side to the downstream side of the filament yarn travel path direction from the outermost peripheral surface of the filament yarn travel path and the innermost circumferential surface of the filament yarn travel path. In addition, when arranged close to the airflow blowing surface, etc., the airflow around the single yarn of the filament yarn can be easily rectified by the airflow blown from the airflow blowing surface, Cooling spots, etc. between the single yarn and each single yarn on the inner peripheral side can also be suppressed, and further, the central member is seen from the filament yarn traveling path direction inside the filament yarn traveling path, in other words, the filament yarn traveling This is because it is easy to dispose inside the innermost peripheral surface of the path, and the central member can be easily disposed with a sufficient size.

  This embodiment is not particularly limited by the spinning pack 2. It is suitable for various spinning packs, and is not particularly limited by the number of spinning packs, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finishing, surface treatment, structure, member configuration, material, and the like.

  This embodiment is not particularly limited by the spin block 3. It is suitable for various spin blocks, and is not particularly limited by the number of spin blocks, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finishing, surface treatment, structure, member configuration, material, and the like. Although not shown in FIG. 1 and FIG. 2, a spinning pack heater for heating and keeping a spinning pack normally disposed in a spin block, a supply pipe for a thermoplastic polymer, a heat insulating member, a heat retaining member, etc. A pump or the like, an additional heating member, a heating means, or the like may be provided, and the present embodiment is not particularly limited by these. The illustration of the spinneret 1, the spin pack 2, and the spin block 3 in FIGS. 1 and 2 is merely an example, and the outer shape of the spinneret 1, the spin pack 2, and the spin block 3 is not limited. The present embodiment is not limited to this.

This embodiment is not particularly limited by the airflow chamber 7 and the airflow supply port 8. It is suitable for various airflow chambers and airflow supply ports, and is not particularly limited by the number, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finishing, surface treatment, structure, member configuration, material, and the like. Also, a member such as a labyrinth structure or a structure of a rectifying grid such as a honeycomb, a pressure loss member, or a member of the air flow blowing portion, a heat insulating member, a heat retaining member, a heating member, a cooling member, a heating unit, a cooling unit, a temperature, It is preferable that one or more or a plurality of types of measuring means such as pressure and flow velocity, airflow adjusting means, and the like are provided. Further, a pressure loss member or the like is provided in the airflow chamber 7 or the airflow passage in the cooling means 4 so that the circumferential flow velocity distribution surrounding the traveling path of the filament yarn of the airflow blown out from the airflow blowing surface is uniform. May be. In addition, the configuration in which the size of the air flow path in the air flow chamber 7 and the cooling means 4 hardly changes along the traveling direction and the traveling path direction of the filament yarn, and the upstream of the traveling direction and the traveling path direction of the filament yarn. Preferred is a configuration that expands and contracts from the side toward the downstream side, or a configuration that includes one or more or multiple types of expansion and contraction from the upstream side to the downstream side in the traveling direction and the traveling path direction of the filament yarn. It is. Further, it is also preferable that a single or plural or plural kinds of air flow chambers and air flow supply ports are provided for the single or plural or plural kinds of cooling means or air flow blowing portions, and the single or plural or plural kinds of air flows. This embodiment is suitable even when one or a plurality of or a plurality of types of air currents, for example, air currents having different materials and compositions, temperatures, flow velocities, flow rates, and the like are supplied to the chamber and the air current supply port.
The present embodiment is not particularly limited by the cooling means 4 as long as the first and second important embodiments of the present embodiment described above are satisfied. It is suitable for various cooling means, and is not particularly limited by the number, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finishing, surface treatment, structure, member configuration, material, and the like. In addition, a member such as a heat insulating member, a heat retaining member, a heating member, a heating member, a cooling member, a measuring unit such as a temperature, a labyrinth structure, a honeycomb, etc. Members such as the structure of the rectifying grid, pressure loss member, etc., members as described in the members of the air flow blowing part, heat insulating member, heat retaining member, heating member, heating means, cooling member, cooling means, temperature measuring means, etc., Alternatively, the cross-sectional shape in the direction perpendicular to the traveling path direction of the filament yarn on the inner inner surface surrounding the traveling path of the filament yarn from the outer peripheral side is circular or the like on the upstream side or the downstream side in the traveling path direction of the filament yarn of the cooling means. It is also preferable that a single member, a plurality of members, or a plurality of members or the like extending in the traveling path direction of the filament yarn having a shape close to that is provided. Further, the present embodiment is not particularly limited by the upstream member of the cooling means, the inner surface of the upstream member, and the like. Although not particularly limited, the inner diameter in the direction perpendicular to the traveling path direction of the filament yarn at the lower end downstream of the traveling path direction of the filament yarn on the inner surface of the upstream member of the cooling means is preferably the upper end of the air flow blowing surface It is preferable that the air flow is provided so as to be the same as or smaller than the inner diameter in the direction perpendicular to the traveling path direction of the filament yarn on the air flow blowing surface. This is because the airflow blowing surface 5, the airflow blowing portion 6 and the like can be supported, held, or sealed more reliably by the upstream member of the cooling means. In addition, the inner diameter of the inner surface of the upstream member of the cooling means on the downstream lower end of the filament yarn in the traveling path direction is perpendicular to the filament yarn traveling path direction, and the filament yarn on the airflow blowing surface at the upper end of the air blowing surface By arranging the upstream member of the cooling means so as to be the same as or smaller than the inner diameter in the direction perpendicular to the traveling path direction, the outermost peripheral surface of the filament yarn traveling path and the upstream side of the cooling means The inner side surfaces of the members are close to each other, and the flow path between the outermost peripheral surface of the filament yarn traveling path and the inner surface of the upstream member of the cooling means is narrowed, and the filament yarn traveling path direction in particular on the airflow blowing surface 5 The airflow blown from the upstream side of the yarn passes through this flow path and rises and flows from the downstream side in the traveling direction of the filament yarn toward the upstream side in the vicinity of the lower surface of the spinneret. This upward flow makes it easier for each filament on the outer circumference side of the filament yarn travel path to be strongly cooled from the upstream side in the filament path direction relative to each inner thread on the inner circumference side. This is because it is possible to make it difficult for problems such as generated cooling spots and yarn shaking to occur. In addition, the present embodiment is also suitable for a cooling unit in which the above-described forms relating to the cooling unit are combined, including the above-described forms such as the airflow blowing surface, the airflow blowing unit, the airflow chamber, and the airflow supply port. In addition, this embodiment is suitable even if a single, a plurality, or a plurality of types of spinning caps or spin packs are provided with a single, a plurality, or a plurality of types of cooling means. In addition, illustration of the airflow blowing surface 5, the airflow blowing part 6, the airflow chamber 7, the airflow supply port 8, the cooling means 4, etc. in FIG. 1, FIG. 2 is an example to the last, and forms, such as these external shapes, are limited. However, the present embodiment is not limited to this as long as the first and second important embodiments of the present embodiment are satisfied. Moreover, the arrow described in the airflow supply port 8 in FIG. 1 and FIG. 2 simply indicates how the airflow flows, and does not limit the flow rate, flow rate, flow direction, and the like of the airflow. The form is not limited to this.

  This embodiment is not particularly limited by the airflow 9 blown out from the airflow blowing surface. It is suitable for various airflows, and is not particularly limited by airflow components, temperature, humidity, flow velocity, flow rate, flow direction, etc., their distribution, and the like. For example, the components of the airflow may be components such as air or oxygen contained in normal air, air containing moisture, inert gas such as noble gas or nitrogen, steam, or a mixture thereof. Is preferred. In general, air or dry air is often used. The temperature of the airflow is, for example, generally about several degrees C or about 10 degrees C to about 20 degrees C or about 30 degrees C, but is not particularly limited. For example, the present embodiment is suitable even when a high-temperature airflow higher than the above temperature or a high-temperature airflow around the glass transition temperature or higher than the glass transition temperature is used for the purpose of slow cooling or the like. For example, the flow rate of the airflow is generally about 1 to 5 m / min to about 100 to 200 m / min in many cases, but is not particularly limited. This embodiment is suitable even when a flow rate within the above range or other ranges is used depending on the number of single filament yarns, single yarn fineness, spinning speed, cooling start distance QTD, and the like. The flow direction of the airflow is not particularly limited. For example, the horizontal direction, the upstream direction from the horizontal direction to the filament yarn traveling path direction, the downstream downstream direction, the filament yarn and the traveling path direction or traveling direction of each single yarn thereof. The present embodiment is suitable even in a direction perpendicular to the upper direction, an upward direction upstream, a downward direction downstream, and the traveling direction of the filament yarn and each single yarn thereof. Although not particularly limited, preferably, the flow direction of the airflow is preferably a direction perpendicular to the traveling direction of the filament yarn or each single yarn thereof, or a downstream downward direction. This is because if the airflow direction is set to the upstream side upward from the direction perpendicular to the traveling direction of the filament yarn or each single yarn, the air resistance acting on the filament yarn or each single yarn is likely to increase. . Distributions of airflow components, temperature, humidity, flow velocity, flow rate, flow direction, etc. are not particularly limited, and this embodiment is suitable for various distributions. The flow velocity distribution in the traveling path direction of the filament yarn of the air current is not particularly limited, and the distribution with almost no change along the traveling path direction of the filament yarn or the upstream in the traveling path direction of the filament yarn is within a range that does not impair the stability of the yarn production. A distribution that gradually increases or decreases from the side toward the downstream side, or a distribution in which the number of increases and decreases from the upstream side to the downstream side in the traveling direction of the filament yarn is one, a plurality, or a plurality of types is also suitable. In the present embodiment, since the inner diameter of the airflow blowing surface is arranged so as to gradually decrease from the upstream side to the downstream side in the filament yarn traveling path direction, the airflow in the region surrounded by the airflow blowing surface The flow velocity in the direction from the upstream side to the downstream side in the traveling path direction of the filament yarn, especially the downstream speed in the traveling path direction of the filament yarn, the relative speed between each single yarn of the filament yarn and the air flow is sufficiently small. It is easy to increase the flow rate to a sufficient level. For this reason, the flow velocity distribution in the traveling path direction of the filament yarn of the air current blown out from the air flow blowing surface is changed from the upstream side to the downstream side in the traveling path direction of the filament yarn for the purpose of saving energy and reducing the manufacturing cost of the filament yarn. The present embodiment is also suitable as a distribution that gradually decreases toward. Also, the temperature distribution in the traveling path direction of the filament yarn of the air current is not particularly limited, and may be the same distribution as the flow velocity distribution in the traveling path direction of the filament thread of the above-described air flow as long as the yarn production stability is not impaired. Is preferred. Although not particularly limited, in the temperature distribution in the traveling path direction of the filament yarn of the airflow, a distribution that gradually decreases from the upstream side to the downstream side in the traveling path direction of the filament yarn is preferable. This is because the traveling state of each single yarn of the filament yarn is easily stabilized. In addition, the distribution in which the temperature gradually decreases from the upstream side in the traveling path direction of the filament yarn to the downstream side is not particularly limited, and from the upstream side in the traveling path direction of the filament yarn to the downstream side within a range that does not impair the stability of yarn production. The temperature gradually decreases continuously or in stages, or the temperature gradually decreases from the upstream side to the downstream side in the direction of the filament yarn traveling path, and the degree of the temperature gradually decreases in the process. A distribution or the like is also suitable. Further, when gradually decreasing the temperature of the airflow blown out from the airflow blowing surface from the upstream side to the downstream side in the filament yarn traveling path direction, the upper end of the airflow blowing surface or the vicinity thereof or the filament yarn traveling path on the airflow blowing surface This embodiment is suitable even when a high-temperature airflow, for example, a high-temperature airflow around the glass transition temperature or higher than the glass transition temperature is used as the airflow blown from the upstream side in the direction. Further, the flow velocity and temperature distribution in the circumferential direction surrounding the traveling path of the filament yarn of the air current are not particularly limited, and similarly, the present embodiment is suitable for various distributions within a range not impairing the yarn production stability. Although not particularly limited, generally, in the inner blow cylindrical cooling means, the flow velocity and temperature distribution in the circumferential direction surrounding the traveling path of the filament yarn of the air flow are often made uniform, and so on. This is also preferable in this embodiment. This is because each single yarn of the filament yarn can be easily cooled uniformly in the circumferential direction. In general, air flow components, temperature, humidity, flow velocity, flow rate, flow direction, dynamic pressure, static pressure, etc. and their distribution are generally adjusted, controlled, and managed. Often done. Further, the air flow is often adjusted, controlled, and managed by an air flow generating means such as a fan or a blower provided in an air flow supply system such as an air flow pipe, an air flow filter, an air flow adjusting means, or the like. In addition, although not particularly limited, for example, supply of airflow until the airflow is blown out from the airflow blowing surface, such as airflow components, temperature, humidity, flow velocity, flow rate, flow direction, dynamic pressure, static pressure, etc. In this embodiment, it is preferable that the system is adjusted, controlled, and managed. In addition, although not particularly limited, airflow components, temperature, humidity, flow velocity, flow rate, flow direction, dynamic pressure, static pressure, etc. and their distribution are provided in an airflow supply system such as an airflow pipe, for example. It is also preferably supplied to the air flow blowing surface, the air flow blowing unit, or the cooling means after being adjusted, controlled and managed by an air flow generating means such as a fan or blower, an air flow filter, an air flow adjusting means or the like. This is for the purpose of preventing the uniformity of the thickness of the filament yarn, the uniformity of quality, and the like from deteriorating due to the influence of fluctuations and fluctuations in the air flow, disturbance in the field atmosphere, and the like. 1 and 2, the air flow 9 is illustrated by a number of arrows, but this simply shows how the air flow is blown out, and the flow rate, flow rate, flow direction, etc. of the air flow are shown. However, the present embodiment is not limited to this.

  The present embodiment is not particularly limited by the means 11 such as thread oil application, focusing, guide, and guide. It is suitable for various means, and is not particularly limited by the number of means, outer shape, outer dimensions, mounting position / orientation, surface shape, surface finishing, surface treatment, structure, member configuration, material, and the like. The thread oil agent applying means may be either a guide oil supply system or a roller oil supply system, and the present embodiment is preferable whether the thread oil agent application / focusing / guide / guide means is non-rotating means or rotating means. In addition, the above means may be provided without being provided, and when provided, any means such as application of a thread oil agent, focusing, guide, guide, etc. may be provided, or any one of them may be provided, or they may be provided. Even if a single, a plurality, or a plurality of types are provided, means in which the above embodiments are combined may be provided in the same manner, and is not particularly limited.

  This embodiment is not particularly limited by the yarn take-up means 12 and the yarn take-up means 13. Suitable for various thread take-up means, thread take-up means, not limited by the number of means, external shape, external dimensions, mounting position and orientation, surface shape, surface finish, surface treatment, structure, member configuration, material, etc. For example, the yarn take-up means is preferably a yarn suction means such as a roller or a suction gun, a yarn feed-out means for sending filament yarn by airflow, a yarn transport means such as a conveyor, etc. For example, the yarn take-up means is a filament This embodiment is also suitable for yarn winding means such as a winder type that winds a yarn or a can type that receives a filament yarn in a container such as a bag. Further, it is preferable that the filament yarn is hung on the roller of the yarn take-up means a plurality of times, and it is also preferred that the yarn take-up means also serves as the drawing means. In addition, thread oiling means, thread winding means, thread oiling means, bundling, guiding and guiding means, heating roller, heating tube and other thread heating means, thread humidifying means, thread relaxing means, thread stretching means, thread suction It is also preferable that a single means, a plurality of yarn feeding means, a yarn conveying means, or the like is provided. Further, it is preferable that a single, a plurality, or a plurality of types of yarn take-up means and yarn take-up means are provided, or that a thread take-up means and a yarn take-up means in which the above embodiments are combined are provided in the same manner.

  The present invention is an extremely versatile invention and is suitable for many filament yarns obtained by melt spinning. In particular, it is suitable for the production of filament yarns with excellent quality such as high elongation, elongation, strength, etc., uniformity of yarn thickness spots and quality spots, and quality such as fluff. Filament yarns made from special or thermoplastic polymers such as filament yarns made into multi-filaments, single yarns with irregular cross-sections, filament yarns modified with thermoplastic polymers, and high glass transition temperatures It is also suitable for the production of high-function filament yarns such as In addition, the present invention is not particularly limited by the configuration of melt spinning of the filament yarn, and is not limited to the configuration of melt spinning corresponding to UDY or POY, but can also be applied to the configuration of melt spinning corresponding to DSD and OSY. The application range is not limited to these.

It is the schematic of the longitudinal cross-section which illustrated typically an example of the structure of the preferable melt spinning which concerns on one Example of this embodiment. It is the schematic of the longitudinal cross-section which illustrated typically another example of the structure of the preferable melt spinning which concerns on one Example of this embodiment.

Explanation of symbols

1: Spinneret 2: Spin pack 3: Spin block 4: Cooling means 5: Air flow blowing surface 6: Air flow blowing unit 7: Air flow chamber 8: Air flow supply provided so as to surround the traveling path of the filament yarn from the outer peripheral side Mouth 9: Airflow blown out from the airflow blowing surface 10: Filament yarn 11: Means for applying, bundling, guiding, guiding, etc. 12: Yarn take-up means 13: Yarn winding means D: A position in the filament yarn traveling path direction The inner diameter QTD of the air flow blowing surface in FIG. 5 is the cooling start distance d: the outer diameter of the outer surface of the central member at a certain position in the filament yarn traveling path direction.

Claims (2)

A spinneret for spinning a molten thermoplastic polymer as a filament yarn, and a circular cross-sectional shape in a direction perpendicular to the travel path direction of the filament yarn, and the filament yarn surrounds the travel path of the filament yarn from the outer peripheral side. A filament yarn manufacturing apparatus having at least a cooling means provided with an air flow blowing surface for blowing the air flow inward from the outer peripheral side of the travel path to cool the filament yarn, wherein the air flow blowing surface of the cooling means An apparatus for producing a filament yarn, characterized in that a cross-sectional shape in a direction perpendicular to the traveling path direction of the filament yarn is arranged so as to gradually decrease from the upstream side to the downstream side in the traveling path direction of the filament yarn. . A method for producing a filament yarn, wherein the filament yarn is produced by melt spinning a thermoplastic polymer using the filament yarn production apparatus according to claim 1.

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