JP5178172B2 - Roller in coagulating liquid and wet or dry wet spinning method using the same - Google Patents

Description

  The present invention coagulates the yarn path of the yarn that has been fiberized by introducing a spinning stock solution (hereinafter referred to as `` dope '') discharged from a spinneret having a large number of discharge holes into the coagulating liquid and coagulating it. The present invention relates to a roller in a coagulating liquid that is changed in liquid and a wet or dry wet spinning method using the same.

  As a conventional technique for spinning a wholly aromatic polyamide fiber having high strength and high modulus, a dope containing a wholly aromatic polyamide polymer is directly spun into a coagulating liquid from a spinneret, or once in the air. The dope spun by spinning into a coagulating liquid after spinning is made into fibers. The spinning method in which the dope is once spun into the air and then introduced into the coagulating liquid is a dry-wet spinning method for the wet spinning method in which the dope spun from the spinneret is directly introduced into the coagulating liquid. Generally called.

  In the spinning method described above, when the dope spun in the coagulating liquid is solidified, if the dope does not stay in the coagulating liquid for a certain period of time or longer, the solvent contained in the dope is sufficient from the dope. Because it does not come out, it does not become fiber. Therefore, when the dope is to be coagulated by using a so-called “static coagulation bath”, it is necessary to retain the dope in the coagulation liquid for a predetermined time. Further, when the fiberization of the dope introduced into the coagulating liquid is completed, the fiber must be pulled up from the coagulating liquid, so that a guide or a roller for changing the yarn path in the coagulating bath is inevitably required.

  However, if guides or rollers are used to change the yarn path of the yarn, there will always be a difference in yarn tension before and after the yarn enters and exits these guides or rollers. Strip stick slip occurs. Then, speed fluctuations occur in the running yarn, and fiber formation spots occur. As a result, the fiber diameter fluctuates and, in severe cases, the yarn breaks. It is necessary to lose it.

  Therefore, a method for optimizing the shape of the guide and the roller has been proposed as a method for suppressing the speed fluctuation of the traveling yarn. For example, in the technique disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 8-246223), a technique for suppressing the spread of running yarn and running resistance has been proposed. Certainly, according to this prior art, since the shape of the guide for turning the yarn is optimized and the yarn contact surface is made of a low abrasion type material, damage to the fiber can be reduced. However, stick-slip on the guide is not sufficiently suppressed even in this conventional technique, and the problem that the yarn speed changes before and after the guide and the fiber diameter fluctuates is not sufficiently solved.

  Further, for example, in the technique disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 11-216536), in order to make the yarn tension appropriate from immediately after spinning the dope from the spinneret to entering the guide There has been proposed a technique in which a plurality of guides are provided in a coagulation bath, and tension cutting is performed by combining them. Certainly, when this conventional technique is used, a tension cut at the guide portion can be performed, and as a result, stick slip can be reduced. However, the abrasion resistance of the running yarn at a plurality of guide portions causes deterioration of the quality of the obtained yarn.

JP-A-8-246223 Japanese Patent Laid-Open No. 11-216536

  In view of the various problems of the prior art described above, the problem to be solved by the present invention is that "the dope discharged from the discharge hole drilled in the spinneret is introduced into the coagulating liquid and solidified to form a fiber. In a coagulating liquid capable of sufficiently suppressing stick slip of a running yarn on the guide or roller in a guide or roller for changing the yarn path of the formed yarn, and a wet or dry wet spinning method using the same To provide.

Here, as the present invention for solving the above-mentioned problem, the spinning solution according to claim 1 is introduced by introducing the spinning stock solution discharged from the discharge holes of the spinneret having a large number of discharge holes into the coagulation liquid. In the roller for performing the yarn path change of the yarn obtained by coagulating the stock solution into fibers, in the coagulation solution,
The roller is a forced drive roller that is forcibly driven to be rotatable, and a thread contact surface that is in contact with the traveling yarn is formed of a liquid-permeable member, and the coagulating liquid is transferred from the liquid-permeable member to the inside of the roller. A liquid suction roller for sucking
A masking member fixed so as not to rotate is provided in the roller in the vicinity of the liquid-permeable member, and the coagulating liquid is sucked from a portion where the thread comes into contact with and rotates around the liquid-permeable member. The coagulating liquid sucked into the roller passes through the masking member in correspondence with the position where the traveling yarn contacts the liquid-permeable member so as not to suck the coagulating liquid from the portion where the yarn does not contact. A roller in the coagulating liquid provided with possible openings is provided .

In this case, the present invention is as described in claim 2 , wherein the material is any one selected from a mesh body, a porous plate, and a porous film stretched on a frame that is a reinforcing material. It is desirable to use the roller in the coagulating liquid according to claim 1, wherein a liquid-permeable member is formed.

Further, according to the present invention, as described in claim 3 , the wet or dry wet spinning is characterized in that wet or dry wet spinning is performed using the roller in the coagulation liquid according to claim 1 or 2. A spinning method is provided.

  As described above, in the “wet or dry-wet spinning method and apparatus” according to the present invention, the liquid suction roller that is forcibly driven in the coagulation bath is used. It runs so as to be pressed down by the coagulating liquid sucked inside. For this reason, the running of the yarn running on the roller is stabilized, and stick-slip is sufficiently suppressed. As a result, fiber formation unevenness is extremely suppressed, and the spun dope can be stably coagulated to be fiberized, thereby producing a remarkable effect that spinning with high spinning stability can be performed. Further, as a matter of course, it is possible to obtain a stable yarn with few single yarn breaks (single fiber breaks) and no quality variation.

  The object of the present invention is a wet or dry wet spinning method and apparatus suitable for producing wholly aromatic polyamide fibers having high strength and high modulus. The present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram schematically illustrating an embodiment of a wet spinning apparatus according to the present invention, and FIG. 2 is an exemplary embodiment of a dry wet spinning apparatus according to the present invention. In these drawings, two different types of spinning apparatuses, ie, a wet spinning apparatus and a dry / wet spinning apparatus, are illustrated, but the means for performing substantially the same function in these spinning apparatuses is the same. Reference signs were used.

Accordingly, in FIGS. 1 and 2, 1 is a spinneret having a large number of discharge holes, 2 is a coagulating bath, 3 is a liquid suction roller that is forcibly driven, 4 is a take-up roller, and 5 is a coagulating liquid. The overflow part of each is shown. Y ₁ represents a yarn in a process in which a dope containing a polymer such as wholly aromatic polyamide is spun from the spinneret 1 and the solvent is extracted from the dope introduced into the coagulating liquid and fiberized. , Y ₂ is respectively a yarn fibers is complete.

  First, in the embodiment according to the wet spinning apparatus illustrated in FIG. 1, the liquid suction roller 3 has an embodiment as shown in the schematic side sectional view of FIG. 3. That is, the liquid suction roller 3 is provided in the coagulation bath 2 and is a liquid-permeable member 31a that can be sucked into the solidification bath 2 (this liquid-permeable member 31 forms a roller shell). 3) (shown with a one-dot chain line in the vicinity of the yarn contact surface C in FIG. 3), and the coagulating liquid is fed from the yarn contact surface C to the roller shell 31a (liquid passage). It is configured to suck into the interior of the sex member 31a).

  As described above, the liquid suction roller 3 according to the present invention can suck the coagulated liquid filled in the coagulation bath 2 from the yarn contact surface C formed on the liquid-permeable member 3a through the suction pipe 32. Then, the sucked coagulation liquid can be discharged from the discharge pipe 34. Although not described in detail here, in the middle of the flow path of the discharge pipe 34, although not shown in the figure, there is provided a coagulating liquid suction means (not shown) composed of, for example, a pump or an ejector. Therefore, the coagulating liquid can be sucked from the contact surface C through the suction pipe 32 from the outside to the inside of the liquid-permeable member 31a by the coagulating liquid suction means.

The Se'itomen C, is spun as a dope from the spinneret 1, yarn Y ₁ which is fiberized in the coagulation bath 2 is in direct contact. Thus, since the yarn yarns Y ₁ are in direct contact, it is necessary that the surface of the liquid permeability member 3a so as not to damage the yarns Y ₁ are smoothly processed. Since the liquid suction roller 3 according to the present invention, as it is a matter of course that is designed to prevent stick-slip of the yarn Y ₁ traveling on the roller 3 for the purpose, has caused even stick-slip This is because it is necessary to consider that the yarn traveling on the roller 3 is not damaged.

  In addition, from the liquid-permeable member 3a, it is desirable to supply the coagulating liquid uniformly from the entire peripheral surface. However, the present invention is not limited to the mesh body, and even if a member having the same effect, that is, the roller 3 is forcibly rotated in the coagulating liquid or a certain amount of yarn tension is applied, it does not deform. “Nonwoven fabric, sintered body, mesh body, perforated plate, etc.” having such appropriate rigidity may be used alone or in combination. The roller shell 31a is combined with the frame and the liquid-permeable member 31a, and the frame having high rigidity is used as a reinforcing material having high rigidity and high strength. It is also possible to stretch the sex member 31a.

  In the liquid suction roller 3 according to the present invention, as explained repeatedly, the roller 3 used in a very delicate spinning process in which the dope discharged from the spinneret 1 is made into a fiber in the coagulation liquid is handled. The strip prevents stick slip on the roller 3. That is, the yarn is kept constant so as not to fluctuate as much as possible even if the spinning tension is slight, and a state in which the yarn slips on the roller 3 and does not suffer damage such as single yarn breakage or abrasion damage appears. It is essential.

  Therefore, in the liquid suction roller 3 according to the present invention, the yarn traveling on the roller 3 is pressed by the action of the hydraulic pressure generated by the flow of the coagulating liquid sucked from the yarn contact surface C, and the yarn roller. Slip on 3 is suppressed. Therefore, it is necessary to make the flow rate of the coagulation liquid passing through the yarn contact surface C almost constant with no flow rate unevenness. Therefore, when designing the yarn contact surface C, it is needless to say that parameters such as an opening area and an opening ratio at which the flow velocity is not generated and the designed flow velocity is obtained must be selected.

  In addition, various conditions such as the type of the liquid-permeable member 31a to be selected, the brand of the yarn to be spun (number of filaments, single yarn fineness), and the spinning speed (rotational speed of the roller 3) are intertwined in a complicated manner. come. Therefore, although a certain standard can be set at the time of design, the optimum specification should be finally determined by experiment.

  By the way, as described above, the dope discharged from the spinneret 1 is made into a multifilament yarn by being fiberized in a coagulating liquid, and then travels while making contact with the roller 3 to form a predetermined winding angle. The winding angle is also a change angle of the yarn yarn path, and is determined by how much the yarn path of the yarn is changed. In this way, the roller 3 around which the yarn is wound is almost constant as long as the yarn travels in a steady state. That is, in the circumferential direction of the yarn contact surface C of the roller 3, there are always a portion where the yarn contacts with a substantially constant winding angle and a non-contact portion where the yarn does not wind.

  Nevertheless, when the coagulating liquid is sucked from the entire circumferential surface of the liquid-permeable member 31a when the yarn is traveling on the roller 3, the following inconvenience occurs. That is, even if the yarn wound around the roller 3 tries to detach from the roller 3, the yarn does not easily detach from the roller 3 due to the hydraulic pressure to press the yarn, and the single yarn becomes The problem is that the roller 3 is taken up and wound around the roller 3.

  Therefore, in order to solve such a problem, the liquid can be sucked only from the portion where the yarn is wound around the roller 3 instead of sucking the coagulating liquid from the entire circumferential surface of the liquid-permeable member 31a. There is a need. Such a function is such that when the roller 3 is fixed without rotating, the winding portion of the thread around the liquid-permeable member 31a is always constant, so that it is opened only at a location where the coagulating liquid is to be sucked. It can be realized by providing an opening and not providing an opening at a place where it is not desired to suck other coagulating liquid.

  However, such a measure cannot be taken when the forcibly driven rotating roller 3 is used like the liquid suction roller 3 according to the present invention. Therefore, in the present invention, the masking member 36 is used so as to correspond to the rotating roller 3. Hereinafter, the function and effect of the masking member 36 will be described in detail with reference to FIG. In addition, the partial cross section is given to the masking member 36 illustrated in FIG.

  The masking member 36 sucks the coagulating liquid only from the portion of the liquid-permeable member 31a where the yarn is wound around the roller 3 even when the roller 3 is rotating, and the other passage where the yarn is not wound around the roller 3 is provided. The liquid member 31a functions to prevent the coagulation liquid from being sucked from the portion.

  For this purpose, the cylindrical masking member 36 is double-cylindrical with respect to the liquid-permeable member 31a as shown in FIG. 3 in close proximity to the cylindrical liquid-permeable member 31a provided on the roller body 31b. Provided. Then, an opening (hole) through which the coagulating liquid can pass is provided only at a position corresponding to a portion around which the yarn of the liquid-permeable member 31a is wound. That is, as illustrated in FIG. 3, the non-masking portion 36a (the meshed shaded portion in FIG. 3) and the masking portion 36b are provided, and an opening (hole) is provided only in the non-masking portion 36a. The portion 36b is not provided with an opening (hole).

  Furthermore, if the masking member 36 is rotated for the same reason as that of the stationary liquid-permeable member in which the opening is partially formed, the coagulating liquid cannot be sucked from a specific portion consisting only of the portion where the yarn is wound. Do not rotate. Therefore, in order to make it non-rotating, it is firmly fixed so as not to move to the fixing block 33 via the suction pipe 32 connected and fixed to the masking member 36.

  In FIG. 3, the members denoted by reference numerals 38a and 38b are seal members that prevent the coagulating liquid filled in the coagulating bath 2 from leaking to the outside. In the example of FIG. 3, an O-ring is used. doing. However, it goes without saying that the seal members 38a and 38b are not limited to O-rings, and seal members such as well-known mechanical seals can be used.

  By the way, in the “force-driven liquid-permeable member 31a” preferably used in the present invention, openings (holes) are formed uniformly over the entire circumferential surface that becomes the yarn contact surface C of the liquid-permeable member 31a. Let me add. However, by providing the masking member 36, the portion of the liquid-permeable member 31a that has been rotated to the position of the masking portion 36a is masked, so that the coagulating liquid is not sucked from this portion. On the other hand, from the portion of the liquid-permeable member 31a that has rotated to the position of the non-masking portion 36b, the coagulating liquid can be satisfactorily sucked from the opening provided at the bottom.

  By configuring the masking member 36 as described above, the suction of the coagulation liquid to the roller 3 includes the roller 3 as shown in FIGS. This is performed from the direction indicated by the arrow only for the portion indicated by the alternate long and short dash line drawn in the vicinity of. However, the solidified liquid is not sucked in the portions where the alternate long and short dash lines are not drawn near the other rollers 3.

  A discharge pipe 34 is provided at the rear end of the masking member 36 to discharge the sucked liquid out of the system through the suction pipe 32. At this time, the discharge of the coagulating liquid to the outside of the system is performed using a known device such as a pump or an ejector provided on the flow path of the discharge pipe 34. At that time, the coagulation liquid discharged out of the system may be used by collecting the solvent extracted from the dope, adjusting its components, and circulating it again in the coagulation bath. It may be discharged as it is.

  In the present invention, as described above, it is extremely preferable to forcibly drive the roller 3 in synchronism with the traveling speed of the yarn. Therefore, in the liquid suction roller 3 according to the present invention, as illustrated in FIG. 3, driving means such as a roller driving pulley 31d and a roller driving belt 31e are fixed to a roller shaft 31c provided on the roller body 31b. Then, power is transmitted to the pulley 31d to rotate the roller shaft 31c. Thereby, the liquid-permeable member 31a of the liquid suction roller 3 is rotatable around the axis.

  At that time, the roller shaft 31c forms a hollow shaft as shown in FIG. 3, bearings 35a and 35a supported by bearing support members 35b and 35b on the outer peripheral surface side of the hollow shaft, and Bearings 37 and 37 are inserted on the inner peripheral surface (hollow) side so as to circumscribe the suction pipe 32, so that the roller shaft 31 c itself can rotate coaxially with the central axis of the suction pipe 32. Therefore, by transmitting power from the rotational driving means such as a motor (not shown) that can control the rotational speed of the roller 3 to the roller shaft 31c through the pulley 31d, the roller shaft 31c, that is, the “thread contact surface C” is easily transmitted. It is possible to forcibly drive the liquid-permeable member 31 "having For controlling the rotation speed, for example, a known rotation speed control device such as an inverter can be used.

  As described above, in the present invention, the roller 3 that is forcibly driven at a speed synchronized with the traveling speed of the yarn can be used. Therefore, compared with a stationary roller, the yarn traveling on the roller It is not abraded and the yarn is not damaged. Moreover, since the traveling yarn is pressed against the roller 3 with hydraulic pressure, stick slip on the roller 3 is difficult to occur, and when the yarn is detached from the roller 3, the yarn is removed. Since the hydraulic pressure acting on the roller 3 is eliminated, it is possible to avoid the situation in which the yarn can be easily detached from the roller 3 and wound around the roller 3.

  Next, using the dry / wet spinning apparatus according to the embodiment illustrated in FIG. 2, a dry / wet spinning process in which a dope containing a polymer made of wholly aromatic polyamide is fibrillated to form a multifilament yarn will be described in detail. explain.

  Here, the “dope” used in the embodiment of FIG. 2 will be described first. This “dope” can be prepared, for example, as described below. That is, 112.9 parts of N-methyl-2-pyrrolidone (hereinafter referred to as NMP) having a moisture content of 100 ppm or less, 1.506 parts of paraphenylenediamine, and 2.789 parts of 3,4'-diaminodiphenyl ether at a room temperature. And after dissolving in nitrogen, 5.658 parts of terephthalic acid chloride is added with stirring. And finally, it is made to react at 85 degreeC for 60 minutes, and a transparent viscous polymer solution is obtained. Next, 9.174 parts of NMP slurry containing 22.5% by weight of calcium hydroxide is added and a neutralization reaction is performed to obtain the necessary “dope”.

As described above, when the prepared dope is made into fibers, first, using a continuous metering means such as a gear pump, the dope supply amount is distributed and supplied to the spin block while continuously metering the dope, and the spin block is supplied to the spin block. The dope is spun from the spinneret 1 provided. However, the spinneret 1 is, for example, a circular disk having an outer diameter of 100 mm with 1000 0.5 mm discharge holes, and the dope is spun into fibers from these many discharge hole groups. To do. Accordingly, each of the yarns Y ₁ and Y ₂ is a multi-piece composed of a number of single yarns (also referred to as “single fibers” or “filaments”) corresponding to the number of discharge holes formed in the spinneret 1. Form a filament yarn.

  In the case of dry and wet spinning, as illustrated in FIG. 2, an air gap G is formed between the liquid surface formed by the coagulation liquid filled in the coagulation bath 2 and the dope discharge surface of the spinneret 1. The dope is first spun from the spinneret 1 into the air gap G. The air gap G is kept constant by controlling the level of the coagulating liquid filled in the coagulating bath to a position that does not always change. That is, the liquid level is supplied with a fresh coagulation liquid that is continuously supplied into the coagulation bath 2 from a coagulation liquid supply pipe (not shown). However, since the used coagulating liquid containing the solvent extracted from the dope from the overflow portion is discharged instead of the fresh coagulating liquid supplied in this way, the liquid level of the coagulating bath 2 is always constant. To be kept.

  If the air gap G formed as described above is too small, the coagulating liquid may come into contact with the dope discharge surface of the spinneret 1, and the dope discharged from the spinneret 1 is spun into the spinneret 1. Coagulation occurs just below the, causing single yarn breakage. On the other hand, if it is too large, adjacent single yarns are brought into close contact with each other due to yarn swaying and the like, and all single yarns are separated from each other, so that independent multifilament yarns cannot be obtained. Therefore, for this reason, the air gap G is suitably 1 mm or more and 50 mm or less in the spinneret 1, for example.

  As described above, the dope discharged from the many discharge holes formed in the spinneret 1 is once spun into the air and then immersed in the coagulating liquid filled in the coagulating bath 2. Then, it is guided to the liquid suction roller 3 that is forcibly driven, which is the main feature of the present invention.

At this time, in the process in which the dope is made into fiber, the dope discharged from the spinneret 1 comes into contact with the coagulation liquid filled in the coagulation bath 2, whereby the organic solvent contained in the dope enters the coagulation liquid. withdrawn and it is known as yarn Y ₁ consists of a number of single-yarn group consisting of a polymer consisting of wholly aromatic polyamide (multifilament) is formed. In the formation process of the multifilament yarn, even if a slight speed change occurs in the spun single yarn group, fluctuation of the fiber diameter or single yarn breakage is induced.

  As described above in the “Background Art” section, this problem is induced when the yarn comes into contact with a guide or a roller provided in the coagulation bath. Therefore, the “forced-driven liquid suction roller 3” according to the present invention is used in order to obtain a state where there is no damage even if the yarn is contacted with the guide or the roller.

Between the yarn Y ₂ leaving the yarn Y ₁ and the roller 3 into the roller 3 by the use of "forced driving liquid suction roller 3" according to the present invention results in a stick-slip, such as a conventional It can be conveyed at a constant speed without any problems. Moreover, after changing the yarn path direction of the yarn Y ₁ that travels in the coagulation bath 2, the water washing step of removing the coagulation liquid adhering to the yarn Y _2, etc. drying step of drying the moisture adhered in the washing process A series of yarn making processes can be performed smoothly. As a result, it is possible to obtain a multifilament yarn having high performance and / or high function quality without deterioration of process condition such as single yarn breakage.

The reason why a very good series of dry and wet spinning as described above is possible is, of course, due to the use of the “forced driven liquid suction roller 3” which is one of the main features of the present invention. Therefore, the yarn can stably travel on the roller 3 rotating at a constant speed without causing stick-slip, and the yarn Y ₂ that has been solidified by changing the yarn path by the roller 3 can be carried out from the coagulation bath 2. It is in having revealed the state. In the wet and wet spinning as well, it is needless to say that the roller 3 illustrated in FIG. 3 described above can be preferably used, and therefore, the description of the liquid suction roller 3 is omitted to avoid duplication of explanation.

The present inventor efficiently suppresses fluctuations in the speed of the yarns Y ₁ and Y ₂ passing through the coagulation bath 2 by using a forcedly driven liquid suction roller device as illustrated in FIGS. The idea of an apparatus having process stability can be achieved. For this reason, the yarn Y ₁ discharged from the spinneret 1 and solidifying in the coagulation bath 2 is provided with a drivable liquid suction roller 3 between the yarns Y ₁ and Y ₂ , so that the speed fluctuation is eliminated. Fiber breaks and quality variations can be reduced.

  In the present invention, the dry and wet spinning method has been described as an example. However, the same effect is manifested in the wet spinning method including the same problem regardless of the presence or absence of the air gap G.

  The liquid suction roller 3 that is forcedly driven as described above will be described in more detail. The dope discharged from the spinneret 1 is immediately after landing in the dry and wet spinning methods, and immediately after discharge in the wet spinning method. Some solvent escapes and solidification begins. It takes a certain time to complete the solidification, and until that time, the dope is solidified to become a fiber and is in a physically weak state. When the dope is solidified and there is no damage to the yarn, the yarn is brought into contact with the liquid suction roller 3 that is forcibly driven to change the yarn path from the coagulation bath in order to carry the yarn out of the coagulation bath. The distance from immediately after the start of solidification to the liquid suction roller 3 is desirably 100 mm or more and 3000 mm or less, and the speed of the take-up roller 4 at that time is preferably 5 m / min or more and 300 m / min or less.

Next, we describe details of the drivable liquid suction roller 3, the liquid permeability member 3a having a Se'itomen C which yarns Y ₁ after spinning are in contact, through the liquid permeability member 3a It is necessary that the average flow rate of the coagulation liquid is in an appropriate range. This is because the average flow velocity is the smaller than the appropriate range, stick slip occurs due to the tension difference between Y ₂ leaving the yarn Y ₁ and the roller 3 into the roller 3. As a result, solidification would cause the occurrence of fineness unevenness in yarn running speed of the yarn Y ₁ of incomplete is fiberized by variation solidify.

Moreover, given the average flow velocity is too large than the proper range, becomes excessive aspiration rate of the coagulation liquid, reversed elicit such yarn swaying, the damage to the yarn Y ₁ or yarn Y _2, obtained The physical properties of the yarns that are produced are reduced. Therefore, in the end, it is necessary to conduct experiments so as to meet these conditions to determine appropriate conditions. In addition, according to the experiment result of the present inventors, it is known that the average flow velocity is preferably in the range of 0.05 m / min to 2.0 m / min.

  In addition, if the method for calculating the average flow velocity is briefly supplemented below as a precaution, first, the flow rate per minute of the coagulating liquid discharged from the discharge pipe 34 is measured. Next, “a liquid-permeable portion of the liquid-permeable member 3a through which the coagulating liquid passes (that is, an“ opening through which the coagulating liquid passes, provided in the liquid-permeable member 3a ”of the liquid-permeable member 3a having the yarn contact surface C. By calculating the total area of “parts”) and dividing the flow rate by this total area, it can be easily obtained.

Next, as for the outer diameter of the liquid-permeable member 3a having the yarn contact surface C, if the outer diameter is small, the yarn restraining effect on the roller 3 by suction is reduced. On the other hand, when the outer diameter is too large, the rotation accompanying flow generated in the coagulation bath 2 is increased with the rotation of the roller 3 and the coagulation liquid flow in the coagulation bath 2 is disturbed. In particular, with respect to yarn Y ₁ of the front and rear coagulation, the disturbance of such coagulation liquid flow is generated, the spinning stability decreases significantly. Therefore, the outer diameter of the roller 3 has an appropriate range, and the appropriate range is 10 mm or more and 500 mm or less.

Finally, in order to confirm the effect of the liquid suction roller according to the present invention, an experimental result performed by the present inventor will be described.
First, in an all-aromatic polyamide dry-wet spinning as an example, in order to obtain a multifilament yarn having 1000 single yarns, one hole is formed from a spinneret having 1000 discharge holes with a discharge hole diameter of 0.3 mm. The dope was spun at a rate of 0.35 g / min. At that time, a dope spun under the above-described conditions is introduced into the coagulation liquid through a gas phase part (air gap) of 20 mm, and a liquid having an outer diameter of 20 mm provided at a position of 500 mm downward from the liquid surface of the coagulation liquid. The yarn path was changed by the suction roller, and the yarn that had been solidified was pulled up from the coagulation bath by the take-up roller. At this time, the take-up speed of the yarn leaving the coagulation bath was 10 m / min, and the rotation speed of the liquid suction roller forcibly driven was also set to the same speed. The average flow rate of the coagulating liquid passing through the liquid passing member formed on the liquid suction roller was 0.5 m / min.

  Next, as a comparative example, a dope spun under exactly the same conditions as in the above-described example is introduced into the coagulating liquid through a gas phase part (air gap) of 20 mm, and is 500 mm downward from the liquid level of the coagulating liquid. The yarn path of the spun yarn was changed by a guide having an outer diameter of 20 mm provided at the position and having no liquid suction function, and the solidified yarn was pulled up from the coagulation bath and taken up by a take-up roller. At this time, the take-up speed of the yarn leaving the coagulation bath was 10 m / min. In this example, all the spinning conditions except that a guide was used instead of the liquid suction roller were the same as in the example.

  As a result, in the 20 mm guide, the fineness unevenness per 100 m was a single yarn fineness of 2.0 dtex ± 0.4 dtex, whereas the average flow rate of the coagulating liquid passing through the liquid passing portion was 0.5 m / min. When a 20 mm liquid suction roller was used, it was 2.0 dtex ± 0.1 dtex. As described above, when the liquid suction roller according to the present invention is used, since the traveling yarn is pressed against the roller by the sucked coagulating liquid, stick slip on the roller is extremely effectively suppressed. As a result, it was confirmed that the running stability of the yarn was improved and the fiber formation spots were reduced. Furthermore, since the variation in the single yarn fineness can be reduced in this way, the quality of the obtained fiber can be improved.

1 is a schematic configuration diagram schematically illustrating one embodiment of a wet spinning apparatus according to the present invention. It is the schematic block diagram which illustrated typically one Embodiment of the dry-wet spinning apparatus which concerns on this invention. It is the schematic block diagram which illustrated typically the schematic structure which concerns on embodiment of a liquid suction roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinneret 2 Coagulation bath 3 Liquid suction roller 4 Take-off roller 5 Overflow part 30 Base 31a Liquid-permeable member 31b Roller body 31c Roller shaft 31d Roller driving pulley 31e Roller driving belt 32 Suction pipe 33 Fixed block 34 Discharge pipe 35a Bearing 35b Bearing support member 36 Masking member 36a Masking portion 36b Non-masking portion 37 Bearing 38a Seal member 38b Seal member G Air gap C Yarn contact surface Y ₁ Yarn in solidification process Y ₂ Yarn after completion of solidification

Claims (3)

Changing the yarn path of the yarn obtained by introducing the spinning dope discharged from the discharge hole of the spinneret having a large number of discharge holes into the coagulating liquid and coagulating the spinning dope to make the fiber into the coagulating liquid. In the roller to do in
The roller is a forced drive roller that is forcibly driven to be rotatable, and a thread contact surface that is in contact with the traveling yarn is formed of a liquid-permeable member, and the coagulating liquid is transferred from the liquid-permeable member to the inside of the roller. A liquid suction roller for sucking
A masking member fixed so as not to rotate is provided in the roller in the vicinity of the liquid-permeable member, and the coagulating liquid is sucked from a portion where the thread comes into contact with and rotates around the liquid-permeable member. The coagulating liquid sucked into the roller passes through the masking member in correspondence with the position where the traveling yarn contacts the liquid-permeable member so as not to suck the coagulating liquid from the portion where the yarn does not contact. Roller in coagulating liquid with possible opening . The coagulating liquid according to claim 1, wherein the liquid-permeable member is formed of any one of a material selected from a mesh body, a porous plate, and a porous film stretched on a frame body that is a reinforcing material. Middle roller. 3. A wet or dry wet spinning method, wherein wet or dry wet spinning is performed using the roller in the coagulation liquid according to claim 1 or 2 .

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