JP2007063689A - Device for cooling yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for cooling a yarn, which makes it possible to spin the multifilament yarn having a small single filament fineness in a state reducing filament sway to control fineness irregularity. <P>SOLUTION: This device for cooling the yarn, comprising at least a spinneret (1) in which spinning holes for spinning a thermoplastic synthetic multifilament yarn (2) comprising 90 to 300 filaments having a single filament fineness of 0.1 to 1.0 dtex and used for clothing are formed on double or triple multiple concentric circles, an annealing means (3) disposed just under the spinneret (1) to anneal the spun yarn (2), and a yarn-cooling device (4) disposed just under the annealing means (3) to cool the spun yarn (2) with a cooling gas is characterized in that the device for cooling the yarn has a circular cooling gas-blowing device (4) for radially blowing the cooling gas from the outermost periphery of the spun yarn (2) to the innermost periphery to surround the spun yarn (2). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a yarn cooling device used for cooling a spun yarn when a thermoplastic synthetic fiber such as polyester or polyamide is melt-spun.

  A method of cooling a spun yarn after melt-discharging a thermoplastic polymer such as polyamide or polyester from a spinning hole perforated in a spinneret is a general process in melt spinning a thermoplastic synthetic fiber. Such a cooling process for synthetic fibers plays an important role in obtaining high-quality yarns, and in particular, in the melt spinning process for garment long fibers, the yarn strength, elongation, and dyeing properties after spinning are extremely high. It is known to have a big impact.

  In recent years, yarns with fineness have been widely used as materials such as woven fabrics, knitted fabrics and nonwoven fabrics. And in the fabric using the yarn of these fineness, in order to raise the feel and functionality more, the single yarn fineness tends to be further thinned. For this reason, production of such multifilament yarns having 90 or more constituent single yarns and a single yarn fineness of 0.3 dtex or less has been carried out. Moreover, in order to increase productivity, a large number of single yarn groups (hereinafter, this “single yarn group” is also referred to as “filament group”) have been spun from one base.

  In order to efficiently produce a yarn composed of such a large number of fine single yarn groups, it is necessary to drill a large number of spinning holes in a single die at high density. However, when trying to punch 90 or more spinning hole groups in one die, it becomes difficult to uniformly cool the single yarn group spun from these spinning hole groups. If it does so, the uniformity of the fineness of the single yarn group which comprises the obtained multifilament yarn will deteriorate. Further, due to poor cooling or insufficient cooling, yarn breakage due to close contact between single yarns may occur, or dyeing may occur when the yarn after melt spinning is processed in a subsequent process.

  Therefore, in order to solve such a problem, in Patent Document 1 (Japanese Patent Laid-Open No. 5-125609), the spinning filament group is spun by using a double square lattice as the arrangement of the spinning holes formed in the spinneret. It has been proposed to allow the cooling air to flow in between.

  However, the prior art proposed in Patent Document 2 (Japanese Patent Laid-Open No. 7-97709) and Patent Document 3 (Japanese Patent Laid-Open No. 2000-34615) including the technology described in Patent Document 1 is a horizontal blowing cooling method. Is assumed. That is, as illustrated in FIG. 3, a cooling device 10 that cools the yarn by blowing cooling air from the lateral direction over a certain length is disposed immediately below the base 1, and the multi-spinned from the spinneret 1 A method is adopted in which the filament yarn 2 is cooled by spraying from the lateral direction at a substantially right angle.

  However, when this horizontal blow cooling method is adopted, it is required to eliminate the disturbance of the cooling air supplied from the cooling device 10. Therefore, in the prior art, cooling air control that mainly supplies cooling air with a uniform wind speed and a constant air direction and suppresses the development of the accompanying air flow generated around the traveling yarn 2 has been mainly performed. It was.

  In other words, in the conventional cooling air control technology, the air flow turbulence inherent in the cooling air supply source is controlled by equalizing the cooling air blowing pressure at the cooling air outlet, so that the cooling air blowing rate and the blowing air velocity are controlled. Is uniform. Usually, such pressure equalization control is performed by using various pressure equalizing members 5 ′ made of the above-described wire mesh, punching plate, porous metal plate or the like. Further, in order to rectify the cooling air blowing direction (the direction indicated by the arrow in the figure) with a constant flow, a parallel rectifying plate or a honeycomb plate is used as a rectifying member 6 'between the cooling air blowing outlet and the yarn 2. It is installed and rectified cooling air is blown onto the yarn.

  However, in the case of melt spinning the fine multifilament yarn 2 in which the perforation density of the spinning hole group formed in the spinneret 1 is further increased, these conventional techniques reach the limit. As long as the horizontal blow cooling method is adopted, the major cause is that the cooling air is blown from only one direction to the multifilament yarn 2 spun from the spinneret 1.

  In general, in the conventional horizontal blowing cooling method, cooling air is blown from one direction to the yarn 2 traveling downstream of the die, and heat is passed from the yarn 2 by flowing between the spun filament groups. After taking it, it flows out to the other side. At this time, in the conventional horizontal blowing cooling method, the distance between the filament group and the cooling air blowing surface becomes large, so the ability to cool the yarn 2 is reduced, and the distance between the yarn 2 and the cooling air is reduced. The heat exchange performance will be reduced. Further, the yarn swing of the spun yarn 2 is also increased.

  Therefore, in order to overcome this situation, it is considered that the speed and the amount of cooling air blown onto the yarn 2 should be increased. However, when such a means is adopted, as illustrated in FIG. 3, the cooling yarn is strengthened and the air volume and the wind speed are strengthened, so that the traveling yarn 2 is greatly expanded toward the leeward side by the wind pressure. If it does so, the problem that a thread | yarn swing will be promoted on the contrary will arise.

  As a matter of course, in the horizontal blowing method, as the number of filaments spun at a high density from one base increases, the penetration of the cooling air between the single yarn groups decreases. If it does so, a cooling spot will arise between the filament group located in the blowing side of cooling air, and the filament group located in the anti-blowing side. This factor is the most important factor that degrades the quality of the yarn, and is also a major reason why the horizontal blowing cooling technology as a cooling process for ultrafine multifilament yarns is limited.

Japanese Patent Laid-Open No. 5-125609 JP-A-7-97709 JP 2000-34615 A

  In view of the above-mentioned problems of the prior art, the problem to be solved by the present invention is that, particularly in melt spinning fine filament multifilament yarns for clothing, discharge filaments are closely cut or broken. An object of the present invention is to provide a yarn cooling device that can effectively suppress the occurrence of fineness spots or the occurrence of dyeing spots even if not reached.

  As a result of intensive studies by the present inventors on the problems of the prior art, a multi-cylindrical shape (annular) is formed from a group of spinning holes drilled on multiple concentric circles in an independent cylindrical cooling air blowing device. By passing the multifilament yarn spun on the cooling yarn, it is possible to blow cooling air radially from the outer peripheral side to the running yarn while keeping the distance between the yarn and the cooling air blowing surface small. did. As a result, even if the cooling air blowing speed is slower than the conventional method, the flow of cooling air to the filament group can be secured, the cooling spots generated between the filaments can be suppressed, and uniform thread cooling can be achieved. It has been found that this is possible, and the present invention has been achieved.

Here, as the present invention for achieving the above-mentioned problem,
(1) Multiple concentric circles having two or three spinning holes for spinning 90 to 300 multifilament yarns for clothing, each thermoplastic synthetic filament having a single yarn fineness of 0.1 to 1.0 dtex A single spinneret perforated above, a slow cooling means for slowly cooling the spun yarn provided immediately below the spinneret, and a spinneret provided immediately below the slow cooling means and spun by cooling air. A yarn cooling device that cools the spun yarn, and further radiates cooling air radially from the outermost circumferential side to the innermost circumferential side of the spun yarn so that the yarn cooling device surrounds the spun yarn A yarn cooling device comprising a cylindrical cooling air blowing device to be generated
(2) The pressure equalizing member for controlling the air volume and / or the wind speed of the cooling air blown to the spun yarn is provided on the inner peripheral surface of the cooling air outlet of the cooling air blowing device. Yarn cooling device,
(3) The rectifying member that rectifies the blowing direction of the cooling air in a constant direction is provided on the outer peripheral side of the pressure equalizing member provided on the inner circumferential surface of the cooling air outlet of the cooling air blowing device. Yarn cooling device,
(4) A multi-filament melt spinning apparatus for melt-spinning a plurality of multifilament yarns is provided with a cylindrical partition member that partitions a slow cooling zone provided for each spindle from an adjacent spindle, and the yarn is separated by the partition member. The yarn cooling device according to any one of (1) to (3), wherein a yarn traveling area from directly above the yarn cooling device to the spinneret surface is sealed, and
(5) The yarn cooling device according to any one of (1) to (4), wherein a density of spinning holes to be drilled in one spinneret is 2.2 to 6.0 holes / cm ^2. Is provided.

  As described above, in a melt spinning apparatus for thermoplastic synthetic fibers (especially polyester fibers) using a conventional cooling device, the single yarn fineness is 0.1 to 1.0 dtex and the fineness is particularly fine. In the cooling of multifilament yarns having 90 to 300 filaments, it has been difficult to obtain a yarn with small occurrence of fineness unevenness between filaments (single yarns). However, by using the yarn cooling device of the present invention, it is possible to reduce the speed and / or volume of the cooling air from the outermost circumferential side with respect to the traveling yarn, while making the air velocity and / or air volume of the cooling air smaller. By blowing cooling air radially to the state side, the yarn is cooled while suppressing the yarn swing, so that the single yarn fineness is 0.1 to 1.0 dtex and the fineness is 90. It became possible to produce ~ 300 multifilament yarns satisfactorily.

  Further, in the present invention, in a multi-spindle spinning apparatus that simultaneously melts and spins a large number of multifilament yarns, a spinning hole is perforated on multiple concentric circles so that the spun yarn is spun into an annular shape. . Furthermore, a cylindrical cooling air blowing device that radially generates cooling air from the outermost circumferential side to the innermost circumferential side of the spun yarn is provided so as to surround the spun yarn, and each weight is provided immediately above it. Cylindrical partition members that are individually partitioned are installed. By installing this partition member, it is possible to block the inflow of airflow that causes disturbance from the outside to each spindle yarn spun in the slow cooling region. As a result, it is possible to obtain a uniform synthetic fiber with smaller fineness spots.

  For yarns with very small single yarn fineness and a large number of filaments, the cooling air is supplied radially without supplying cooling air from one direction as in the past, and the outermost peripheral side of the spun yarn The cooling air is penetrated from the innermost side to the innermost side. If it does so, the swelling of the spinning yarn which arises with the cooling method of the conventional side blowing system can be eliminated, and it becomes possible to shorten the distance between a spinning yarn and a cooling wind blowing surface. Therefore, the flow velocity of the cooling air that determines the heat exchange property between the yarn and the cooling air can be kept smaller than that of the conventional method. As a result, even cooling air with a slower flow rate than the conventional method has sufficient cooling performance, so it is possible to achieve cooling of the yarn while suppressing yarn fluctuation that causes unevenness of single yarn fineness. It becomes.

Embodiments of the present invention are described below with reference to the drawings.
FIG. 1 is a front sectional view schematically showing an embodiment in which the yarn cooling device of the present invention is applied to a melt spinning device of a thermoplastic polymer made of polyester, polyamide, etc. It is explanatory drawing. In FIG. 1, 1 is a spinneret mounted on a melt spinning apparatus, 2 is a yarn, 3 is a cylindrical partition member, 4 is a cylindrical cooling air blowing device, 5 is a cooling air pressure equalizing member, Reference numeral 6 denotes a cooling air flow regulating member, 7 denotes an oil agent applying device, 8 denotes a yarn interlacing device, 9 denotes a pair of take-up rollers, and 10 denotes a winder. FIG. 2 is a plan view of the spinneret 1 as viewed from the polymer discharge surface F, where C1 and C2 indicated by alternate long and short dash lines are double concentric circles, and H is drilled on the double concentric circles. Each spinning hole group is shown.

  In the melt spinning apparatus configured as described above, the material was discharged from the spinning hole group H formed in the spinneret 1 on the multiple concentric circles (in FIG. 2, the double concentric circles (C1) and (C2)). The polymer travels downstream while forming a cylindrical (annular) multifilament yarn 2. Then, the spun multifilament yarn 2 is finely multifilament yarn into a slow cooling region in which the yarn traveling region is surrounded by a cylindrical partition member 3 provided immediately below the base 1 and sealed from the outside. Spinned in a state of being molded into 2.

  Next, the spun yarn 2 travels inside a cylindrical cooling air blowing device 4 provided immediately below the partition member 3, and moves from the outermost peripheral side of the spun yarn 2 to the innermost peripheral side. It cools to predetermined temperature with the cooling air blown off radially. The cooling air blowing device 4 is provided with a pressure equalizing member 5 and a rectifying member 6 on the cooling air blowing surface, and constitutes a yarn cooling device together with a cooling air supply means (not shown).

  Here, the pressure equalizing member 5 is composed of a porous member that causes a pressure loss when the cooling air passes, thereby generating a predetermined back pressure in the cooling air supplied to the cooling air blowing surface. Thus, it plays a role of making the flow rate and / or speed of the cooling air blown from the cooling air blowing surface to the spun yarn 2 constant. Further, the rectifying member 6 has a role of aligning the direction of the cooling air that has passed through the pressure equalizing member 5 (shown by the arrowed line segment in the drawing) to be perpendicular to the spun yarn 2. Plays.

  At that time, the pressure equalizing member 5 which is an important part for fulfilling the above function is a porous member which causes a pressure loss when the cooling air passes, for example, a porous sintered metal member, commercially available Examples thereof include a resistor formed by laminating a single layer or multiple layers of a woven net or a non-woven fabric woven or woven of metal fine wires or plastic fine wires at a high density, and a laminated plate obtained by laminating perforated plates. A plurality of these members may be combined.

  Next, with respect to the rectifying member 6 which is an important part for fulfilling the above function, a parallel plate which is vertically overlapped by forming a gap through which cooling air passes, and in addition to the parallel plate in the vertical direction. In addition, a lattice plate or a honeycomb (honeycomb) plate laminated in a lattice shape by forming a gap through which cooling air passes can be used.

  The spun yarn 2 cooled as described above is entangled between filaments by the yarn interlacing device 8 after the oil agent is applied by the oil applying device 7 located below the cooling air blowing device 4. Is taken up by a pair of godet rollers (take-up rollers 9) and finally taken up by a winder 10 to form a yarn package made of long fibers for clothing. In the embodiment shown in FIG. 1, the description of the drawing process for drawing the melt-spun yarn 2 is omitted. Usually, however, it is once wound around the winder 9 as in the melt spinning process illustrated in FIG. The film is taken and supplied to the drawing process, or is drawn in the direct spinning drawing process after the melt spinning process without winding.

  In the cooling air blowing device 4 that constitutes a part of the yarn cooling device of the present invention, as described above, the cooling air whose air volume and / or wind speed is made uniform by the pressure equalizing member 5 is spun from the rectifying member 6 in the direction of the wind. The spinning yarn 2 is sprayed radially from the outermost circumferential side to the innermost circumferential side so as to be perpendicular to the outgoing yarn. Therefore, unlike the conventional horizontal blow cooling method, according to the yarn cooling device of the present invention, the cooling air can easily flow through the filament group at a weaker wind speed from a distance closer to the traveling yarn 2. However, the yarn 2 does not bulge in the spraying direction as in the conventional method, and as a result, the yarn sway is reduced. If it does so, a single yarn fineness spot will also become small and a higher quality thread can be obtained.

  The spinning yarn to which the cooling air is blown is formed only in a double cylindrical or triple cylindrical circumferential row and travels toward the downstream side. The flow through is very good. Therefore, in the conventional method, the cooling air blowing side filament group and the anti-blowing side filament group, which become conspicuous when cooling air is blown from one direction to the whole of a large number of filament groups spun at high density, are generated. Cooling spots can be suppressed very well.

  Further, in the yarn cooling device of the present invention, since the cooling air can be blown onto the traveling yarn from the cylindrical blowing surface surrounding the spun yarn 2, the cooling air blowing area can be further increased. Moreover, the spraying distance between the cooling air blowing surface and the spun yarn 2 can be reduced without causing the cooling air blowing distance to be extremely long in the anti-blowing side filament group as in the case of the horizontal blowing cooling method. It becomes possible to set it short. This means that the heat exchange between the yarn and the cooling air can be greatly improved.

  Note that the cooling air blown from the cooling air blowing surface of the yarn cooling device is initially blown out in a uniform direction by the rectifying member. However, since the cooling air is a gas, it is a liquid such as water. In contrast, it has the property of being diffused and disturbed as soon as it is blown out. In addition, the longer the cooling air blowing distance is, the more noticeably the diffusion and disturbance of the cooling air appears.

  As described above, in the conventional yarn cooling device, the spun yarn 2 swells to the cooling air counter-blowing side, so that the distance between the cooling air blowing surface and the spun yarn Y becomes larger, and the cooling air Will spread. Therefore, the flowability of the cooling air between the filament groups is lowered, and the heat exchange property with the spun yarn Y is also lowered. As a result, the cooling capacity is lowered, and the speed of the cooling air to be blown out has to be increased. As a result, the problem that the yarn is liable to be induced is caused as described above.

Compared to such a conventional technique, in the yarn cooling device of the present invention, it is possible to set the flow velocity or the air volume of the cooling air blown out from the blowing surface to be smaller. For this reason, the spun yarn 2 can be cooled with a smaller wind speed from a close distance. As a result, it is possible to further reduce the yarn sway, which is the largest factor causing fineness spots. Therefore, the drilling density of the spinning holes H drilled in the spinneret 1 can be further increased. Thus, in the present invention, the drilling density of the spinning holes H drilled in one spinneret 1 is 2.2 to 6.0 holes / cm ² , more preferably 2.5 to 4.5. Pieces / cm ² .

Here, if the drilling density of the spinning holes H to be drilled in one spinneret 1 is less than 2.2 / cm ² , it is not necessary to use the yarn cooling device of the present invention, and the conventional yarn Even if a strip cooling device is used, a sufficient effect can be obtained. Therefore, in the present invention, it is preferable that the perforation density of the spin holes H perforated in one spinneret 1 is 2.2 or more / cm ² , but if it exceeds 6.0 / cm ² , Even if the yarn cooling device of the invention is used, the reflux performance of the cooling air between the filament groups is lowered, which causes problems as described in the “Background Art” section, which is not preferable.

  For brands with small single yarn fineness, such as the fineness multifilament yarns targeted by the present invention, quench as much as possible immediately below the base 1 and move the cooling solidification point to the upstream side and increase the spinning tension. It is important as a spinning technique to reduce yarn swing. However, when the cooling and solidifying point is moved to the upstream side, the elongation behavior of the spun yarn 2 in the slow cooling region provided immediately below the die 1 becomes extremely important.

  Therefore, in the yarn cooling device of the present invention, the spun yarn 2 is caused to travel inside the cylindrical cooling air blowing device 4 to suppress disturbances received by the spun yarn 2 as much as possible, and the cooling air blowing device. A cylindrical partition member 3 is also provided for each weight individually in the slow cooling region existing immediately above 4. Then, by sealing the slow cooling region between the spinneret 1 and the cooling air blowing device 4, it is possible to prevent the cooling air blown from the cooling air blowing device 4 from entering the slow cooling region. Moreover, the influence by the inflow of the external airflow that causes the thread swaying at each weight can be suppressed, which is important and effective as a further fineness unevenness suppression technique.

  Furthermore, due to the synergistic effect of reducing the wind speed of the cooling air blown from the cylindrical cooling air blowing device 4, rapid cooling is realized while further suppressing the yarn swinging. In the yarn cooling device of the present invention, the oil agent applying device 7 Can be moved further upstream. As a result, the position where the spun filament groups are converged can be shortened, and the effect of preventing yarn swing is further improved. However, when cooling and solidification of the spun yarn 2 is slow, that is, when the cooling and solidifying point extends further downstream, the frictional resistance between the oil agent applying device 7 and the spun yarn 2 becomes large, and the oil agent It has been found that single yarn breakage or yarn breakage is induced by rubbing with the applying device 7.

It is explanatory drawing (front sectional drawing) which showed typically the example of 1 embodiment at the time of applying the yarn cooling device concerning this invention to a melt spinning process. It is the top view which looked at the spinneret from the discharge surface of the polymer. It is explanatory drawing (front sectional drawing) which showed typically the example of application to the melt spinning process of the yarn cooling device concerning the conventional horizontal blow cooling system.

Explanation of symbols

1: Spinneret 2: Multifilament yarn 3: Cylindrical partition member 4: Cooling air blowing device 5: Cooling air pressure equalizing member 6: Cooling air flow straightening member 7: Oil supply device 8: Yarn entanglement device 9 : A pair of take-up rollers 10: Winding machine

Claims (5)

  Spinning holes for spinning 90-300 multifilament yarns for clothing having a single yarn fineness of each thermoplastic synthetic filament of 0.1-1.0 dtex are formed on double or triple concentric circles. A single spinneret provided, a slow cooling means for slowly cooling the spun yarn provided immediately below the spinneret, and a spun yarn provided by cooling air provided immediately below the slow cooling means. A yarn cooling device that cools the yarn, and further generates cooling air radially from the outermost circumferential side to the innermost circumferential side of the spun yarn so that the yarn cooling device surrounds the spun yarn. A yarn cooling device comprising a cylindrical cooling air blowing device.   The yarn according to claim 1, further comprising a pressure equalizing member for controlling an air volume and / or a wind speed of the cooling air blown to the spun yarn with respect to an inner peripheral surface of the cooling air outlet of the cooling air blowing device. Cooling system.   The yarn cooling according to claim 2, wherein a rectifying member that rectifies the blowing direction of the cooling air in a constant direction is provided on an outer peripheral side of the pressure equalizing member provided on an inner circumferential surface of the cooling air outlet of the cooling air blowing device. apparatus.   The multi-filament melt spinning apparatus for melt-spinning a plurality of multifilament yarns is provided with a cylindrical partition member that partitions a slow cooling zone provided for each spindle from an adjacent spindle, and the yarn cooling apparatus is provided by the partition member. The yarn cooling device according to any one of claims 1 to 3, wherein a yarn traveling region from directly above to the spinneret surface is sealed. Bored density of spinning holes formed in a single spinneret is from 2.2 to 6.0 pieces / cm ^2, yarn cooler according to any one of claims 1 to 4.

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