JP5456978B2 - Dry and wet spinning equipment - Google Patents

Description

  The present invention relates to a dry / wet spinning apparatus in which a spinning dope is once spun into a gas such as air from a spinneret having a large number of spinning holes, and the spun dope is introduced into a coagulation bath to be fiberized. .

  As a spinning technology for spinning fully aromatic polyamide fibers that have both high strength and high modulus, a spinning dope containing a wholly aromatic polyamide polymer is once spun into a gas such as air from the spinneret and spun. There is known a dry-wet spinning method in which the dope stream is introduced into a coagulating liquid to form a fiber. In this dry-wet spinning method, the dope spun into the air gap is guided to a coagulation liquid, and the solvent in the polymer is removed from the dope to remove the solvent. Is done.

  However, when the dope spun with the coagulating liquid is solidified as a yarn, it is solidified in a so-called "static coagulation bath", and when the dope or the yarn travels in a stationary coagulating liquid, Receive resistance. Then, due to the liquid resistance, a phenomenon that the single fiber constituting the multifilament yarn is cut occurs, so that the spinning speed cannot be increased and the speed has to be lowered.

  Moreover, in order to remove a predetermined amount of solvent from the dope, a residence time until the dope stays in the coagulating liquid and the solvent escapes is required to some extent. Therefore, if the spinning speed is increased, the residence time is reduced. Therefore, it is necessary to ensure a long immersion length in the coagulating liquid. If it does so, the problem that a spinning equipment will become long or huge inevitably arises.

  Therefore, as a method of solving these problems and increasing the spinning speed, for example, in the prior art disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 60-52610), a coagulating liquid is introduced into the flow tube. The dope and the yarn are run along with the flowing coagulating liquid, and the resistance received from the coagulating liquid is reduced, thereby increasing the spinning speed while preventing single fiber breakage. A “solidification method” has been proposed.

  Certainly, according to this method, the flow rate of the coagulating liquid can be increased by introducing the coagulating liquid into the flow tube and causing it to flow. For this reason, the speed of the spun yarn and the flow rate of the coagulating liquid can be brought close to each other, and the resistance that the yarn receives from the coagulating liquid can be reduced. However, even if such a method is adopted, it is difficult to match the speed of the traveling yarn and the flow rate of the coagulating liquid flowing in the flow tube, and this is unavoidably caused by the speed difference between the two. The problem remains that fiber breakage occurs and stable spinning cannot be performed.

  Moreover, in this prior art, the coagulating liquid flowing through the flow tube is not added or updated from the middle of the flow tube. For this reason, in the system in which the dope is solidified in the flow tube, as the yarn passes through the flow tube, the concentration of the solvent escaped from the dope increases as it flows downstream, and as a result, solidifies as intended. The stability of the target quality is impaired. In particular, in order to improve productivity, when increasing the number of single fibers constituting the yarn, the amount of solvent that must be extracted from the dope also increases in proportion to the amount of single fibers. Probability will also be higher.

  In addition, in the wet and wet spinning described above, including the case of wet spinning, after the solidification step of the spun uncoagulated yarn, the solvent concentration in the yarn is increased and plasticization tends to occur. It is possible to increase the strength by aligning the polymers in the fiber with each other by subsequent plasticizing and stretching. However, after solidifying, the solvent concentration in the fiber is raised to reveal a plasticized state, and when trying to stretch the fiber, running resistance is generated between the coagulating liquid with the increased solvent concentration, Similar to the solidification process of the spun yarn, there is a problem that the single fiber is broken due to the resistance caused by the coagulating liquid having an increased solvent concentration.

  In order to solve such problems, there is a conventional technique proposed in, for example, Patent Document 2 (Japanese Patent Laid-Open No. 61-19805). In this prior art, an unsolidified yarn spun from a spinneret is instantaneously stretched several tens of times at the outlet using a flow tube having a funnel shape with a tapered outlet. Further, it has been proposed that at least the requirement is that the second coagulating liquid be ejected from the liquid ejector to the drawn yarn and the coagulating liquid that freely fall below the coagulating liquid.

  Certainly, according to this prior art, the flow rate of the coagulating liquid flowing in the flow tube can be instantaneously increased, and thereby the spun yarn can be drawn rapidly. Further, if the coagulating liquids having different concentrations are supplied from the liquid ejector, the coagulating liquid concentration can be controlled during the coagulation process. However, this prior art technique rapidly stretches unsolidified yarns, and in the case of wholly aromatic polyamide polymer, there is a problem that single fiber breakage is caused by rapid stretching. In addition, a zone where the yarn and the coagulating liquid freely fall between the flow tube and the liquid ejector is formed, and when the yarn enters the liquid ejector, a rapid fluid velocity change occurs, causing the solidification. There is a problem that the single fiber constituting the yarn in the process is cut.

JP 60-52610 A Japanese Patent Laid-Open No. 61-19805

  In view of the problems of the prior art described above, the problem to be solved by the present invention is that “a spinning solution (dope) is temporarily put into a gas atmosphere such as air from a spinneret having a large number of spinning holes”. In dry-wet spinning, in which a dope is introduced into a coagulation bath containing spinning and coagulating liquid, and fiberized, the frequency of single fiber breakage is reduced to improve productivity, and between the single fiber groups constituting the yarn. It is to provide a dry-wet spinning apparatus for spinning a fiber having stable and excellent performance with no variation in quality.

Here, as the present invention for solving the above-mentioned problems, the coagulating liquid according to claim 1 wherein the spinning stock solution spun through the air gap from the spinneret having a large number of spinning holes is made into a fiber and solidified. A coagulation bath to fill,
(1) having openings at both ends thereof, (2) one end opening is funnel-shaped and provided below the liquid level of the coagulation liquid, and (3) the other end opening is the installation of the one end opening. (4) a first straight pipe portion extending substantially vertically downward from the one end side opening, and an angle of 10 ° to 120 ° with the first straight pipe portion. A second straight pipe part provided by forming a curved pipe part connecting the first straight pipe part and the second straight pipe part with a curved pipe having a radius of curvature of 20 mm to 400 mm in the central part; Is formed toward the opening on the other end side, and (5) the coagulating liquid flowing into the inside from the opening on the one end side flows through the first straight pipe portion, the curved pipe portion, and the second straight pipe portion. A flow tube configured to flow out from the other end side opening,
Said flow tube curved pipe section and / or al provided in the second straight pipe portion is of coagulating liquid supply for supplying a high concentration of the coagulation liquid than the concentration of the coagulation liquid flowing in the first straight pipe portion to said flow tube At least with the dry-wet spinning apparatus and means. Is provided.

  In addition, as described in claim 2, the present invention may be a “wet and wet spinning apparatus according to claim 1, comprising a take-up roll for taking up the yarn that has exited the second straight pipe portion”. desirable.

  Further, according to a third aspect of the present invention, as described in claim 3, "the coagulating liquid supply means supplies the coagulating liquid having a concentration higher than the concentration of the coagulating liquid flowing in the front first straight pipe portion. Desirably, the dry-wet spinning device according to claim 1 or claim 2 is used.

The present invention, as set forth in claim 4, "the liquid injection portion of the solidifying solution supply means for injecting a coagulating liquid to flow tube, equalizing the injection pressure of the coagulation liquid pressure equalization pressurization it is desirable that the dry wet spinning system "according to claim 1 provided with a member.

  As described above, according to the dry and wet spinning method and apparatus of the present invention, the spinning speed can be increased and the concentration and temperature in the flow tube can be arbitrarily set, so that the dope fiber in the flow tube can be set. Coagulation for conversion can be performed efficiently. For this reason, the obtained yarn has a very remarkable effect that a stable one with few single fiber breakage and no quality variation can be obtained.

The object of the present invention is a dry and wet spinning method suitable for producing a fully aromatic polyamide fiber having both high strength and high modulus, and an apparatus therefor.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention conceived by the present inventors will be described in detail below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram schematically illustrating one embodiment of a dry / wet spinning apparatus according to the present invention. In FIG. 1, D represents a dope containing a polymer made of wholly aromatic polyamide, and Y represents a yarn obtained by extracting a solvent from such a dope and fiberized. Reference numeral 1 denotes a spinneret in which a large number of spinning holes are formed, 2 denotes a coagulation device, 3 denotes a flow tube, and 4 denotes take-up means including a rotating body for taking up the yarn.

  In the embodiment according to the dry and wet spinning apparatus of the present invention configured as described above, the coagulation apparatus 2 includes a coagulation bath 2a, a coagulation liquid supply pipe 2b, a coagulation liquid discharge pipe 2c, and a coagulation bath 2a. It includes a collecting means 2d for collecting the coagulating liquid overflowing from. However, in FIG. 1, L indicates “coagulating liquid in the coagulating bath 2a” and L1 indicates “coagulating liquid overflowing from the coagulating bath 2a”. S denotes the liquid level formed by the coagulation liquid L.

  In the coagulation apparatus 2 configured as described above, the coagulation liquid L is supplied to the coagulation bath 2a from the supply / supply pipe 2c by a coagulation liquid supply means (not shown). As for the coagulation liquid L supplied to the coagulation bath 2a in this way, one excessively supplied portion overflows from the upper end of the coagulation bath 2a and flows out of the coagulation bath 2a, and the other is required. The minute flows down through the first straight pipe portion 3a. Therefore, the coagulation bath 2a is always filled with the full coagulation liquid L, and the liquid level of the coagulation bath 2a is always maintained at a constant level position. The excess coagulating liquid L1 overflowed is recovered by the recovery means 2d and discharged from the discharge pipe 2c connected to the recovery means 2d.

As described above, the coagulation liquid L supplied to the coagulation bath 2 a flows into the flow tube 3 together with the dope D spun from the spinneret 1 by flowing into the flow tube 3. In addition, as illustrated in FIG. 1, the flow tube 3 has (1) openings O ₁ and O ₂ at both ends thereof, and (2) one end side opening O ₁ has a funnel shape, and the coagulation liquid. (3) The other end side opening O ₂ is provided below the installation position of the one end side opening O ₁ and is opened to the atmosphere, and (4) the one end side opening O is provided. _{A first} straight pipe portion 3a extending substantially vertically downward from ₁ ; a second straight pipe portion 3c provided at an angle of 10 ° to 120 ° with the first straight pipe portion 3a; formed a bent tube portion 3b for connecting the the straight tube portion 3a second straight pipe portion 3c in curved pipe having a predetermined curvature radius R towards the other end side opening O _2, (5) the one end The coagulating liquid L that has flowed into the inside from the side opening O ₁ flows through the first straight pipe portion 3a, the curved pipe portion 3b, and the second straight pipe portion 3c, and flows out from the other end side opening O _2. It is configured.

At this time, doped D is introduced into a coagulating bath 2a in filled with coagulating liquid L is spun from the spinneret 1, and then, while entering from the end side opening O ₁ to the first straight pipe portion 3a. Then, the coagulating liquid L and the dope D flowing down in the first straight pipe portion 3a pass through the curved pipe portion 3b having a predetermined curvature radius R, and form an angle of 10 ° to 100 ° with the first straight pipe portion 3a. eggplant is discharged from the other end side opening O ₂ of the second straight pipe portion 3c.

At that time, the coagulating liquid regulator 5 is disposed at any one of the first straight pipe portion 3a, the curved pipe portion 3b, and the second straight pipe portion 3c so that the fibers passing through the flow pipe 3 are disposed. supplying it plasticization "high additional coagulating liquid of solvent concentration L2". The coagulating liquid regulator 5 includes a storage unit 5a for storing the additional coagulating liquid L2 and a supply unit 5b for supplying the additional coagulating liquid L2, and the first straight pipe unit 3a is provided inside the coagulating liquid adjusting unit 5. The additional coagulating liquid L2 is supplied from the periphery to the coagulating liquid La flowing from the first straight pipe portion 3a through the rectifying supply pipe 5c that can stably supply the liquid flow from the peripheral direction of the plasticized coagulating liquid I try to get Lb.

Next, the process in which the dope D containing a polymer made of wholly aromatic polyamide is fibrillated using the dry and wet spinning apparatus of this example to form the yarn Y will be described in detail below.
First, “dope” in the present invention will be described. This “dope” can be adjusted, 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”.

  When the adjusted dope is made into a fiber as described above, first, a continuous metering means such as a gear pump is used to distribute and supply the dope to the spin block while continuously metering the dope. The dope is spun from the spinneret 1 thus obtained. However, the spinneret 1 is, for example, a circular disk having an outer diameter of 100 mm with 1,000 0.5 mm spinning holes drilled, and the dope D is spun into fibers from these many spinning hole groups. It is something to be issued. At that time, as illustrated in FIG. 1, an air gap G is formed between the liquid surface S formed by the coagulating liquid L and the dope discharge surface of the spinneret 1.

  If the air gap G is too small, the coagulation liquid may come into contact with the dope discharge surface of the spinneret 1, and the dope discharged from the spinneret 1 will coagulate directly under the spinneret 1, and the single fiber Causes a slice. On the other hand, if the size is too large, adjacent yarns in the spinneret are brought into close contact with each other, and independent fibers cannot be obtained. For this reason, the air gap G is suitably 1 mm or more and 50 mm or less in the spinneret, for example.

  As described above, the dope D discharged from the numerous spinning holes formed in the spinneret 1 is once spun into the air, and then into the coagulation liquid L filled in the coagulation bath 2a. It is immersed and then led to the flow tube 3 which is a major feature of the present invention. A flow tube 3 is inserted and fixed inside the coagulation bath 2a in correspondence with each spinneret 1. The flow tube 3 is set at a position lower than the liquid level S formed by the coagulation liquid L. Yes.

  At this time, as a process in which the dope D is fiberized, the organic solvent contained in the dope D is contained in the coagulating liquid L by bringing the coagulating liquid L and the dope D into contact with the coagulating bath 2a and the flow tube 3. It is well known that a yarn Y composed of a large number of single fiber groups (multifilaments) made of a polymer made of wholly aromatic polyamide is formed. Further, the yarn Y formed in this way is taken up by the take-up means 4 such as a rotating body, a washing step for removing the coagulating liquid adhering to the yarn Y, a drying step for drying the moisture attached in the washing step, etc. A series of yarn making processes consisting of It is also well known that fibers having high performance and / or high function are obtained by this series of spinning processes.

  In the dry-wet spinning process in the series of spinning processes as described above, the present invention is characterized by the concentration of the coagulating liquid L in the flow pipe 3 and the flow pipe 3 as already described. It requires a mechanism that can change the temperature. Therefore, the concentration and coagulation liquid regulator 5 of the present invention will be described in detail below with reference to FIGS.

  In the flow tube 3, a concentration and coagulation liquid regulator 5 for adjusting the concentration and temperature of the coagulation liquid La flowing in the flow tube 3 is provided. The concentration and coagulation liquid regulator 5 is composed of a storage section 5a for storing the additional coagulation liquid Lb and a supply section 5b for supplying the additional coagulation liquid Lb. The additional coagulating liquid L2 can be supplied from the periphery to the coagulating liquid La flowing in the flow pipe 3 through the rectifying supply pipe 5c that can stably supply the liquid flow from the peripheral direction. The concentration of the coagulating liquid La flowing in the flow tube 3 increases as the organic solvent contained in the dope D is extracted into the coagulating liquid L while flowing down the flow tube 3. Further, when the temperatures of the coagulating liquid L and the dope D are different, the temperature also rises. If it flows down in the flow tube 3 as it is, it takes time for the concentration of the organic solvent contained in the dope D to reach the target concentration, so the organic solvent concentration can be maintained in a short time and compared with the conventional method. A method of reducing the concentration to the target concentration is preferable.

  In order to express the strength of the solidified fiber in the first straight pipe portion 3a, there is a method of swelling (plasticizing) with a high-concentration solution after coagulation and then stretching and orientation after sufficient plasticization. In this method, these were performed in separate steps. However, in addition to the large-scale process, it is necessary to provide a roller or the like between these processes, and a single fiber breakage occurs in the roller or the like for a fiber that is very easily damaged such as coagulated yarn. There was a problem such as. Therefore, the concentration and temperature of the coagulating liquid Lb flowing in the second straight pipe portion 3c can be adjusted by supplying the additional coagulating liquid L2 having different concentrations and temperatures from the concentration and coagulating liquid regulator 5. The plasticized coagulating liquid Lb has a higher solvent concentration than the coagulating liquid La flowing down in the first straight pipe part 3a, and the plasticized coagulating liquid Lb is used to solidify the fibers that have been coagulated to the end of the first straight pipe part 3a. After swelling and plasticizing the fibers in the second straight pipe portion 3c, the fibers and the plasticizing liquid are separated on the exit side of the second straight pipe portion 3c and the drawing orientation is advanced between the take-up means 4. According to this method, by controlling the flow and concentration of the coagulation liquid, the two processes of coagulation and plasticization can be carried out continuously, and there is no process such as a roller, so the single fiber breaks, etc. It is possible to obtain a stable yarn with no crack.

  The flow rate regulator 5 will be described in more detail with reference to FIG. 2. In order to prevent the flow rate of the coagulating liquid L flowing in the flow tube 3 from changing suddenly, the connection portion at the top of the flow tube 3 and the flow rate regulator 5 has a sudden diameter. It is desirable that there is no change. Further, the flow regulator 5 has a rectification supply plate 5c for supplying the additional coagulation liquid L2, and supplies the fluid from the periphery to the flow tube 3, but the flow rate of the additional coagulation liquid L2 supplied from the rectification supply plate 5c. It is desirable to supply the water uniformly, and it is preferable to have a rectifying effect such as a mesh. However, the present invention is not limited to the mesh, and a non-woven fabric, a sintered body, a mesh, a perforated plate, or the like that can obtain the same effect may be used. In addition, the shape of the rectification supply plate 5c is preferably a shape that does not change abruptly because the flow velocity is not changed from the cross-sectional shape of the flow tube 3. More preferably, a shape that spreads in a conical shape from the diameter of the flow tube 3 is desirable so that the average flow velocity of the fluid flowing in the rectifying supply plate 5c is constant.

  According to this invention, the present inventors have bent the first straight pipe portion 3a by using a flow tube device characterized by having a concentration and coagulation liquid regulator 5 as illustrated in FIGS. The inventors have come up with an apparatus that efficiently affects the organic solvent concentration of the dope D flowing through the pipe portion 3b to the second straight pipe portion 3c and does not affect the physical properties. Therefore, the yarn Y discharged from the spinneret 1 and landed from the coagulation bath liquid surface S is the second straight pipe portion having an appropriate concentration and temperature profile by the coagulation liquid L2 supplied by the concentration and coagulation liquid regulator 5. By obtaining the plasticizing liquid in 3c, by carrying out the two processes of coagulation and plasticization continuously, there is no rubbing with a roller or the like, so that the filament Y finally obtained is a single fiber Cuts and variations in quality can be reduced.

  The flow tube 3 of the present invention described above will be described in more detail. The flow rate from the coagulation bath liquid surface S to the upper end of the flow tube 3 with respect to the flow rate of the coagulation liquid La flowing into the flow tube 3 from the coagulation bath 2a. When the distance is small, the flow of the upper part 3a of the flow tube 3 is disturbed, and this is propagated to the liquid level S, and the liquid level S is disturbed. On the other hand, when this distance increases, the effect of stabilizing the flow of the coagulating liquid L due to the installation of the flow tube 3 is lost, and the coagulating bath liquid surface S is disturbed. Therefore, in order to stabilize the coagulation bath liquid level S, the distance from the coagulation bath liquid level S to the upper end of the flow tube 3 is 2 mm or more and 100 mm or less, preferably 5 mm or more and 50 mm or less. is necessary.

  Next, the shape suitable for the flow tube 3 of the present invention will be described. The shape is the amount of the coagulating liquid L brought into the flow tube 3 by the dope D discharged from the base 1, and the flow tube of the dope D itself. 3 is determined depending on various conditions such as the amount of inflow to 3 or the take-up speed of the fiberized yarn Y. For this reason, ultimately, it is necessary to determine an optimum shape by performing experiments so as to meet these conditions.

  However, in this regard, for example, if the take-up speed of the yarn Y by the take-up means 4 is in the range of 10 m / min or more and 300 m / min or less, the number of single fibers constituting the yarn Y can be efficiently used. In order to carry out production, 10-5000 pieces are required. Taking this point into consideration, the equivalent diameter of the yarn is 1 mm or more and 20 mm or less. Accordingly, the inner diameter D of the right cylinder of the flow tube lower part 3c is 2 mm or more and 30 mm or less. It is preferable.

  Next, since a certain amount of time is required for solidification to make the dope D spun from the base 1 into a fiber, the length of the first straight pipe portion 3a needs to be a certain length or more. However, on the other hand, if the length of the straight cylinder at the bottom of the flow tube 3 becomes long, an excessive frictional resistance acts between the inner wall surface of the first straight tube portion 3a and the running yarn Y, and the yarn Y becomes strong. I want to make it shorter because it causes rubbing of single fibers and threads. Therefore, if these conditions are satisfied, it is preferable that the straight cylinder length L of the lower part 3b of the flow tube is 100 mm or more and 1000 mm or less.

  Although not shown in FIG. 1, in the present invention, a rectifying member is installed at each site in the coagulation bath 2a to form a stable flow so that the flow of the coagulation liquid L is not disturbed. This is a preferred embodiment. Here, if the rectifying member is exemplified, a screen having excellent fluid permeability such as a perforated plate, a honeycomb plate, and a woven or knitted fabric can be exemplified, and these are particularly solidified liquid flowing into the first straight pipe portion 3a. It is desirable to provide near the introduction part.

Angle of disposing the curved pipe portion 3b preferably has an angle of the first straight pipe portion 3a and the 10 ° to 120 °. An angle of 80 ° to 100 ° is more desirable. A curved pipe portion 3b that connects the first straight pipe portion 3a and the second straight pipe portion 3c with a curved pipe having a predetermined radius of curvature is formed in the flow pipe 3 at a radius of curvature R in which the curvature changes rapidly. Since the moving yarn Y may be damaged by coming into contact with the tube wall of the curved pipe portion 3b, the radius of curvature R at the central portion of the curved pipe portion 3b is preferably 20 mm to 400 mm, and more preferably 100 mm. To 300 mm.

  Further, the rectifying supply plate 5c provided in the coagulating liquid regulator 5 for adjusting the concentration and / or temperature of the coagulating liquid Lb preferably forms a stable flow so that the flow of the coagulating liquid Lb is not disturbed, and the rectifying member Is preferably used. Here, as examples of such a suitable rectifying member, a screen having excellent fluid passage properties such as a perforated plate, a honeycomb plate, and a woven or knitted fabric can be cited, and these can be used for the rectifying supply plate 5c. desirable.

  Furthermore, in order to supply the coagulating liquid L stably and uniformly from the rectifying supply plate 5c, a resistance due to the fluid in the rectifying member is required to some extent, and the pressure of the coagulating liquid supplied by such resistance Can be equalized to some extent. If such a pressure equalizing member is exemplified by a woven or knitted fabric, it is preferable to use one or a plurality of woven or knitted fabrics having a mesh size of 20 to 2000 mesh.

  Furthermore, with respect to the coagulation liquid L supplied from the coagulation bath supply pipe 2b of the coagulation apparatus 2, the conditions of the concentration and the additional coagulation liquid L2 supplied from the supply pipe 5b of the coagulation liquid regulator 5 are generally solidified. It is desirable that the concentration of the liquid mixture when the solution of the additional coagulating liquid L2 is mixed with the concentration reached by the liquid L1 is close to the concentration at which the fiber is plasticized, and the supply amount and the flow rate in the second straight pipe portion 3c. It is desirable to change the diameter of the second straight pipe portion 3c according to the above. In this way, after the coagulation step, the solvent concentration in the fiber can be increased and plasticized, and by stretching after plasticization, the polymer in the fiber is oriented to promote high strength. can do.

It is the schematic block diagram which illustrated typically one Embodiment of the dry-wet spinning apparatus which concerns on this invention. It is sectional drawing which showed typically the example of 1 embodiment of the flow tube of this invention.

Explanation of symbols

1: Spinneret 2: Coagulator 2a: Coagulation bath 2b: Coagulation liquid supply pipe 2c: Coagulation liquid discharge pipe 2d: Coagulation liquid recovery means 3: Flow pipe 3a: First straight pipe section 3b: Curved pipe section 3c : Second straight pipe section 4: Yarn take-up means 5: Flow rate regulator 5a: Coagulating liquid storage section 5b: Coagulating liquid supply pipe 5c: Coagulating liquid rectifying supply plate L: Coagulating liquid L2: Additional solution La: concentration and temperature controller before coagulating solution Lb: concentration and after temperature controller plasticizer solution G: air gap D: doped O _1: one end side opening O _2: the other end opening S: coagulating bath liquid surface Y: yarn Article

Claims (3)

A coagulation bath filled with a coagulation liquid for fiberizing and coagulating a spinning stock solution spun through an air gap from a spinneret having a large number of spinning holes;
(1) having openings at both ends thereof, (2) one end opening is funnel-shaped and provided below the liquid level of the coagulation liquid, and (3) the other end opening is the installation of the one end opening. (4) a first straight pipe portion extending substantially vertically downward from the one end side opening, and an angle of 10 ° to 120 ° with the first straight pipe portion. A second straight pipe part provided by forming a curved pipe part connecting the first straight pipe part and the second straight pipe part with a curved pipe having a radius of curvature of 20 mm to 400 mm in the central part; Is formed toward the opening on the other end side, and (5) the coagulating liquid flowing into the inside from the opening on the one end side flows through the first straight pipe portion, the curved pipe portion, and the second straight pipe portion. A flow tube configured to flow out from the other end side opening,
Said flow tube curved pipe section and / or al provided in the second straight pipe portion is of coagulating liquid supply for supplying a high concentration of the coagulation liquid than the concentration of the coagulation liquid flowing in the first straight pipe portion to said flow tube At least with the dry-wet spinning apparatus and means.   The dry-wet spinning apparatus according to claim 1, further comprising a take-up roll for taking up the yarn that has come out of the second straight pipe portion. The dry-wet spinning apparatus according to claim 1 or 2 , wherein a pressure equalizing member for equalizing the injection pressure of the coagulating liquid is provided in the liquid injecting portion of the coagulating liquid supply means for injecting the coagulating liquid into the flow tube.

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