JPS61179316A - Method of multiple spindle spinning of chemical yarn - Google Patents

Abstract

PURPOSE:In piling multiple-spindle yarn in parrallel as a yarn heap on a net conveyor for treating, to treat it efficiently, by shortening the distance between the heaps until the ends of the yarn heaps are superimposed, are preventing turbulence of loop part protruded from the yarn heaps during the treatment. CONSTITUTION:Filaments of the yarn 3a, 3b, and 3c made by wet spinning are shaken off on the inverting belt conveyor 8 by a swing device, and the beltlike yarn heaps 7a, 7b, and 7c are piled. The yarn heap 7b is piled in such a way that is ends are superimposed on the bottom and the loop of the yarn heaps 7a and 7c. A large amount of the yarn can be piled on the net conveyor with the same width, and turbulence of parts protruded from the yarn heaps during treatment is eliminated.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a method for cleaning wet-spun chemical fibers with high productivity;
It relates to a finishing treatment method, and more specifically, it includes washing or drying, such as I/4'-raphenylene terephthalamide (hereinafter abbreviated as PPTA) fiber wet-spun from an optically anisotropic dope. This invention relates to an improved method for rounding chemical fibers, which undergo finishing treatments such as washing and drying with good productivity and high quality, so that the fiber length does not substantially change in size when subjected to finishing treatments in a relaxed state.

<Prior Art> PPTA is a polymer that has been known for a long time), and it was expected that fibers with excellent heat resistance and mechanical properties could be obtained due to its rigid molecular structure. However, P.P.
Since TA is poorly soluble in organic solvents, Cipriani proposed a basic method of wet spinning using concentrated sulfuric acid as a solvent (Japanese Patent Publication No. 18573/1973), but Cipriani's method itself was not industrialized. .

Furthermore, it has been theoretically predicted that fully aromatic polyamides with a rigid structure such as PPTA will become anisotropic in concentrated solutions.
Kwolek proposed a wet spinning method for a concentrated solution of these aromatic polyamides with a rigid and linear molecular structure in a liquid crystal state (Japanese Patent Publication No. 8474/1983), which could be used as-spun and without stretching. It is known that fibers with strength and initial modulus comparable to conventional drawn synthetic fibers can be obtained, and that fibers with excellent strength and initial modulus can be obtained by subjecting the fibers to tension heat treatment.

The glaze is produced by dry-jet wet spinning of optically anisotropic dope of PPTA and other rigid linear chain wholly aromatic polyamides in the as-spun state. The fibers exhibit a special microstructure,
It was proposed that high strength could be developed by this method (Japanese Unexamined Patent Publication No. 4
7-39458), it is introduced that it is also suitable for reinforcing rubber.

In addition, there are many proposals to improve productivity by increasing the spinning speed of these fibers (Japanese Patent Application Laid-Open No. 53-78320, JP-A-53-78321, JP-A-56-12831).
Publication No. 2, JP-A-57-121612, JP-A-5
9-157316).

However, there are few concrete proposals regarding finishing treatments such as washing and drying of these wet-spun fibers, and even the proposal for high-speed spinning of cut angles still has problems in industrial implementation.

A method has been proposed for finishing wet-spun PPTA and other rigid straight-chain wholly aromatic polyamide fibers by depositing the yarns on a net conveyor and processing them under no tension. Obtained (% 1975-1
No. 54522, Japanese Patent Application Laid-Open No. 160517/1983,
JP 55-122012A). However, this method of finishing on a net conveyor is also a finishing method suitable for high-speed spinning. In other words, as the spinning speed increases, the speed of the yarn passing through the washing device, drying device, etc. also increases, and the friction with guides, etc. increases, which causes damage to the yarn, and the time spent in each device increases. must be kept constant, so the size of the apparatus must be proportionally increased. Conventionally used Nelson roll type processing apparatuses have an upper limit due to mechanical constraints.

On the other hand, when finishing yarns are deposited on a net conveyor, the yarn moves on the net conveyor in a completely relaxed state and is subjected to washing, drying, etc., regardless of the spinning speed. No damage will be sustained. Another advantage is that the size of the net conveyor device can be expanded freely.

<Problems to be Solved by the Invention> However, the problem with processing yarn on a net conveyor is that the yarn shaken down onto the moving net conveyor is stacked one after another in a loop shape, forming a thread pile in the form of a belt. It forms a thread and undergoes processing such as washing and drying while remaining in the form of a thread. Therefore, the loops of the yarn that are shaken out do not necessarily draw a constant /9 turn in a stable manner, and there are loops that protrude from the width of the band of the thread pile, and these protruding loops are caused by the flow of the washing liquid during washing. When the yarn is picked up from the net conveyor, it is disturbed by the hot air flow during drying, causing problems such as getting tangled with the yarn of the adjacent thread pile, wrapping around the guide, etc. There was a problem in that the parts became sagging, impairing the quality.

The present invention solves the above problems and provides chemical fibers, such as PPTA fibers, whose fiber length does not substantially change in dimension when subjected to finishing treatments including washing or drying in a relaxed state. ,
The purpose of the present invention is to provide an improved method for performing finishing treatments such as washing and drying with high productivity and high quality. The PPTA will make every effort to resolve the issue.
It was discovered that when fibers wet-spun from the optically anisotropic Dawg of System I remer are washed and dried in a relaxed state on the net conveyor, no substantial dimensional change occurs in the fiber length direction. The present invention has been completed as a general-purpose finishing method that includes other chemical fibers that exhibit similar behavior.

That is, the object of the present invention is to form a coagulated yarn by wet-spinning a chemical fiber raw material that has a characteristic that the fiber length does not substantially change in size when subjected to finishing treatment including washing or drying in a relaxed state. A plurality of coagulated yarns are placed on a net conveyor using a transfer device to arrange the stacked piles substantially parallel to each other for finishing treatment, and then each yarn is individually taken out and wound. In the multi-spindle spinning method for chemical fibers, the feeding of the plurality of coagulated yarns to the net conveyor by a transfer device is performed via a reversing mechanism, and the plurality of coagulated yarns are fed onto the reversing mechanism or on the net conveyor. The formation of the thread pile-like pile layer is carried out so that the formation of the thread pile-like pile layer is at least temporally shifted for each adjacent yarn, and the thread-like pile pile layer is later supplied and arranged at the end of the thread pile-like pile layer of the yarn that was supplied and arranged first. The feeding interval of each yarn in the width direction of the net conveyor is determined so that the ends of the thread pile-like piled layer of yarns overlap, thereby forming a band-shaped yarn pile layer continuous in the width direction on the upstream side of the net conveyor. When a plurality of yarns are taken out from the net conveyor after being formed upside down from the state supplied from the transfer device and subjected to the finishing treatment to the belt-shaped yarn deposit layer, the yarns placed above are This is achieved by a multi-spindle spinning method for chemical fibers, characterized in that the timing of taking out the yarns is staggered at least for each adjacent yarn so that the yarns are taken out from the thread pile-like deposited layer.

A reversing belt conveyor disposed oppositely on the upstream portion of the net conveyor is used as the reversing mechanism, and a plurality of coagulated yarns are transferred onto the reversing belt conveyor from each of the transfer devices at least for each adjacent yarn in a temporal manner. It may be arranged such that the band-shaped yarn stack layer is formed by supplying and disposing the yarn stack in a staggered manner, and then the tangential band-shaped yarn stack layer is inverted and transferred onto a net conveyor below. An advantage of this configuration is that when a plurality of yarns are taken out from the conveyor, the yarns placed first on the reversing belt conveyor can be taken out first.

The reversing mechanism includes at least two reversing mechanisms that are disposed close to the net conveyor at intervals in the traveling direction of the net conveyor on the upstream portion of the net conveyor, and have a rotation axis parallel to the rotation axis of the net conveyor. Using a book reversing roller, at least adjacent yarns of the plurality of coagulated yarns are fed from the transfer device to different reversing rollers to form a thread-like pile of each yarn, and subsequently each of the n yarns is fed from the transfer device to a different reversing roller. The thread pile-like deposited layer may be sequentially transferred upside down onto the net conveyor to form the band-like yarn deposited layer. With this configuration, when taking out a plurality of yarns from the net conveyor, the yarns placed later on the net conveyor can be taken out first.

One typical example of the embodiment of the present invention will be explained using the drawings using an example of PPTA-based fiber.

FIG. 1 shows one embodiment of the present invention, in which a PPTA-based & IJ mother-optically anisotropic dope sent from a dope adjustment step (not shown) is transferred to a spinneret 1al.
Discharge lbll, spinning bath 2m + 2b *2c
It is coagulated and wet-spun. Although Fig. 1 shows an example of 3 spindles for convenience of explanation, industrially, for example, 2 spindles are used.
It can be carried out on a scale of 0 m, 40 spindles or more. Furthermore, Fig. 1 shows an example of the so-called air-gap wet spinning method in which the dope discharged from the spinneret travels in the air and then is guided into the spinning bath. A wet spinning method involving immersion in a bath can also be carried out in the same manner.

The wet-spun yarns 3 m, 3 b t 3 c are taken out from the spinning bath at a predetermined speed by a take-up roll 5 through direction change guides 4 m, 4 b, 4 c, and then each pair of metal rods is [by two transfer devices 6a and 6b consisting of rolls arranged in a cylindrical shape] are shaken down onto a reversing belt conveyor 8, deposited as a belt-shaped layer 7, and then reversed upside down. It is transferred onto net conveyor 9.

A feature of the present invention is that a plurality of transfer devices are used, and the yarns running next to each other are each guided by a separate transfer device and are placed on the same reversing belt conveyor back and forth, as shown in FIG. is deposited in That is, FIG. 2 is an enlarged view of the reversing belt conveyor section. For example, yarns 3a and 3c are placed on the reversing belt conveyor 8 at 6b in FIG.
The yarn 3 is first transferred to point A on the reversing belt conveyor 8 to form yarns 7a and 7C by the transfer device.
The yarn 3b sandwiched between the yarns m and 3e is transferred to the origin 7a at a point B on the reversing belt conveyor 8 by a 6m loss device.
, 7c, and contacts both streams to form stream 7c. At this time, the end portions of the origins 7a and 7c have widened hems as the hypotenuses of the trapezoid, and a loop-like protrusion has also occurred, but the ends of the origins 7b are 7h, 7
It will be deposited overlapping the hem or loop at the end of the e.

The reason for the deposition on the reversing belt conveyor can be varied in various ways, as shown in cross section in FIG.

Figure 3a shows an example in which a very small portion of the hem overlaps, and Figure 3c
In the figure, the parts of Kana 9 on both sides are stacked on top of each other. The effect of the present invention can be achieved in either case, but normally, the thickness of the overlapping part of the two sides should be selected between about 5% and 120% of the thickness of the central part of the two sides. Preferably, as shown in Fig. 3b, the thickness of the whole layer is almost uniform, so that the passage of water during washing and the transfer of heat during drying are uniform. It is expected that

In the example shown in Figure 4, there are two transfer devices, 6m and 6b, so adjacent yarns are alternately guided to each transfer device and placed at two locations, point A and point B, as shown in Figure 2. The yarns are shaken down onto the reversing belt, but it is also possible to increase the number of falling points on the reversing belt by using three or more transfer devices.In short, adjacent yarns fall at different points and begin to form. It is important that the points are placed around each other.

The group of strands formed on the reversing belt in this way is reversed upside down and transferred onto the net conveyor 9, and is held between the cag 7 and the belt 18 to prevent turbulence of the strands. After being processed through a washing machine 10, an oil applying machine 11, and a dryer 12, it is taken up from the net conveyor 9.

The processed yarns are first 13 in the same order as they were deposited.
At point m, yarns 15a of origin 7m and 7c, which were transferred first, and yarns 15b of origin 7b, which were transferred later at point 13b, are transferred to short yarn guides 14m and 14, respectively.
By being drawn out by the drawer o-le 16 through step b, adjacent yarns can be picked up from the net conveyor without becoming entangled with each other.

The yarn fed by the pull-out roll 16 is passed through the winding machine 17a.
It is rolled up at p17b and p17c, respectively.

The embodiments of the present invention are not limited to the example shown in FIG. 1, and the devices and materials used for each part may be arbitrarily selected as long as they substantially fulfill the functions described above. It's good.

Further, the Capuar belt 18 in FIG. 1 may be omitted depending on the type and conditions of the washing machine, dryer, etc.
It is also possible to replace a part of the water washer 10 with a device that neutralizes with alkaline water.

The origin of the net conveyor
It is also permissible to carry out heat treatment as disclosed in Japanese Patent Application Publication No. 55-122012, and the method of the present invention is to carry out only washing with water and pull it out from the net conveyor without drying.
It is also useful in methods of drying under tension.

Furthermore, the embodiment of FIG. 1 may be replaced with an independent reversing belt conveyor or a reversing belt conveyor for each of two or more transfer devices, instead of using one reversing belt conveyor for two or more transfer devices.
It is also possible to use a reversing roll such as 9b, and that method is one of the other embodiments of the invention.

In FIG. 4, the spun yarns 3m+3bm3C pass through a take-off crawler 5j-, and similarly to the embodiment in FIG. is guided to the transfer device 6&, the yarn 3b next to it is guided to the transfer device 6b, and the yarn 3c next to it is guided to the transfer device 6a, each of which has a reversing device paired with the transfer device. Roll 19m and 1
Form a base 7 on 9b. Next, the yarns 3a and 3c on the reversing roll 19a are transferred onto the net conveyor 9 while being turned upside down, and then, between these transfers, the yarns 3b on the reversing roll 19b are placed on the net conveyor 9. The fibers are transferred onto the net conveyor so that the end portions of each fiber are in contact with each other. The yarns are then processed on a net conveyor in the same way as in the case of FIG.

First, the original yarn transferred onto the net conveyor is pulled out, and then the original yarn transferred onto the net conveyor is pulled out 1, and then similarly wound with a winding machine via a pull-out roll. It can be raised.

In carrying out the method of the present invention, a typical target fiber is a fiber obtained by wet-spinning an optically anisotropic dope of a PPTA polymer. The reason is that when the optically anisotropic Dogu made of PPTA-based polymer is wet-spun,
As introduced in No. 89 et al., the coagulated fibers already show almost complete molecular orientation, with an orientation angle of 40° or less in wide-angle X-ray diffraction, and therefore the molecular orientation has been achieved by stretching. Like ordinary synthetic fibers in which the fiber structure is completed, there is almost no shrinkage during washing or drying, so this system can be deposited on the net conveyor of the present invention and processed in a completely relaxed state. , there is no dimensional change in the yarn.

That is, as the yarn shrinks during processing, the width of the yarn decreases;
Not only will there be gaps between the yarns deposited next to each other, but the yarns in those areas will also pull against each other, resulting in undesirable processing irregularities and tangles.

Based on this fact, even fibers made from raw materials other than those mentioned above, substantially the same as fibers made from optically anisotropic dope of PPTA-based polymer, undergo a dimensional change of about 1 inch during treatment in a relaxed state. However, if such fibers are treated, the effects of the present invention can be expected to be the same as those of the present invention.

Typical examples of chemical fibers that have dangerous properties such as substantial dimensional changes in fiber length when subjected to finishing treatments that include washing or drying in a relaxed state include wet-spun fibers from optically anisotropic dopes. , PPTA fiber, yfi IJ No. 4 raphenylene bispen #71k (PPBT) fiber, poly 17/4' raphenylene bispenzoxazole (P
PBO) fibers or cyanoethyl cellulose and other cellulose derivative fibers also wet-spun from optically anisotropic dopes.

Hereinafter, details will be explained focusing on a PPTA-based polymer which is a typical example of implementing the present invention.

Margin below The PPTA-based polymer referred to in the present invention has the following unit -NH
-Ar 1-NH-(1) -Co-Ar 2-CO
-(u) and C0-Ar5-NH-G[I] [In the above formula, units CI) and [■] are present in substantially equimolar amounts in the polymer, and Ar+ + Ar2 and Ar3 are , each representing an aromatic group whose chain is coaxially or linearly connected in the opposite direction of a divalent aromatic group].

Specifically, the divalent aromatic groups Ar1, Ar2 and Ar3 are /#raphenylene, 4,4'-biphenylene, 1,4-naphthylene, 1-5 naphthylene, 2-6
Naphthylene, 2-5 pyridylene, etc., which may be substituted with one or more inert groups such as halogen, lower alkyl, nitro, methoxy, and cyano groups.

Arl, Ar2 and Ar3 may each be two or more types, and may be the same or different.

That is also allowed.

These PPTA-based polymers can be easily synthesized by any known method, for example, by deriving the corresponding socarboxylic acid into an acid imidazolide, an acid imidazolide, an ester, etc., and then reacting it with a diamine. A method in which a diamine is induced into incyanate and a method in which the diamine is reacted with a dicarboxylic acid can be applied, and any of these methods can be used in carrying out the present invention.

Although the intrinsic viscosity of the PPTA-based polymer used in the present invention is not particularly limited, it is usually 4.5 or more and 12.0 or less, preferably 6.0 or more and 10.0 or less, as measured by the method described below.

The optically anisotropic dope for spinning used in the method of the present invention is prepared from such a PPTA-based polymer by a known method. In this case, concentrated sulfuric acid is industrially advantageously used as the solvent. The concentration of concentrated sulfuric acid is preferably 95% by weight or more, particularly when dissolving a PPTA-based polymer having a high intrinsic viscosity at a high rate, 97.5% by weight, more preferably 99xis or more. However, if desired, sulfuric acid solvents such as chlorosulfuric acid and fluorosulfuric acid and sulfur trioxide, pentaacid acid, trifluoromethanesulfonic acid, fluorosulfonic acid, etc.
A mixture containing up to about 30% by weight of halogenated acetic acid and halogenated acetic acid as an additive may be used as long as the effects of the present invention are not impaired.

The polymer concentration of the optically anisotropic dope for spinning exhibits optical anisotropy when it is about 10% by weight or more, but in general, the higher the polymer concentration, the easier it is to obtain high-performance fibers, so a high concentration is recommended, and preferably a low concentration. Both should be at least 13% by weight, preferably at least 15% by weight. However, if the concentration is too high, for example, 21:tf 1% or more, the polymer will not be completely dissolved9 and the viscosity of the dope will be too high, so it will be necessary to set the dope temperature high, which will cause difficulties in the spinning operation. Easy to accompany. Therefore, it should be chosen not to be too expensive.

In carrying out the present invention, even if a conventional spinneret is located in the spinning bath, the wet spinning method is used after passing through a non-coagulating or post-coagulating layer and then introducing it into the spinning bath. It may be a two-stage method, but in order to obtain high-performance fibers / +3
When it is desired to raise the temperature of the spinner than the spinning bath in order to increase the polymer concentration and improve the fluidity of the dope, or when it is necessary to increase the spinning speed or The latter is preferred when attempting to thin the fibers.

Other spinning specifications and conditions are not particularly limited.

In the apparatus of FIG. 1 in which the method of the invention is carried out, adjacent yarns are necessarily deposited one first on a reversing belt conveyor, and then the other yarn is deposited on a reversing belt conveyor, and then the other yarn is In the device shown in Figure 4, adjacent yarns do not necessarily have their ends transferred onto another reversing belt conveyor or reversing roll. As a result, the looped yarn exposed at the end of each yarn becomes part of the adjacent yarn. After being transferred onto the net conveyor, the yarn is not exposed to a liquid or gas flow alone, so it is treated under the same conditions as the yarn in the yarn pile, resulting in no loops or threads. Does not cause disturbance.

Furthermore, since each source is in contact with the other sources, the disadvantages of conventional methods such as liquid and airflow passing through between the sources and insufficient distribution of liquid and airflow throughout the thread pile are eliminated, and processing efficiency is increased. .

Adjacent raiyu groups whose ends overlap with each other are placed on the reversing belt conveyor, and the raiyu are transferred upside down and transferred onto the net conveyor, so that the ends of the raiyu overlap each other. Since the part of the yarn that was transferred to the net conveyor and placed under the later yarn is on the top surface, if you pick it up as it is, the same yarn will be unwound from the net conveyor without moving back and forth or getting tangled. , for each origin, in the device shown in Fig. 1, the origin of the yarn is transferred first onto the reversing belt conveyor, and in the device shown in Fig. 4, the origin of the yarn is transferred later onto the net conveyor. By first drawing out the yarn and then pulling out the remaining yarns, unraveling can be achieved without γ-m entanglement between the yarns.

Further, by applying the optically anisotropic doped wet-spun fibers of PPTA polymer, as mentioned above, there is almost no dimensional change during processing of the fibers, and the above-mentioned effects can be completely realized.

,<Example> Examples of the present invention will be described in more detail below.

In the examples, 9 parts and 9 parts unless otherwise specified are based on weight.

The main parameter measurement methods used to measure physical properties are as follows.

Measuring method of intrinsic viscosity〉 Intrinsic viscosity (η1nh) is determined by dissolving a polymer or fiber in 98.5% by weight concentrated sulfuric acid at a concentration (C) ±0.5.9/dt using the usual method at 30°C. Measure accordingly.

Measuring method of strength and elongation characteristics of fibers> Unless otherwise specified, the tensile strength, elongation, and Young's modulus of filaments were measured by a conventional method in accordance with JP-A No. 47-39458. do.

Confirming the optical anisotropy of the dope> Place it between a glass plate with a small amount of dope, stretch it thinly, and set it between the orthogonal polarizers of an optical microscope.

The dark field under crossed Nicols can be easily determined because the dope depolarizes the light and turns it into a bright field.

Reference Example A PPTA polymer was obtained as follows by low temperature solution polymerization method.

In the polymerization apparatus shown in Japanese Patent Publication No. 53-43986, 70 parts of anhydrous calcium chloride was dissolved in 1000 parts of N-methylpyrrolidone, and then 48.
6 parts were dissolved. After cooling to 8°C, 91.4 parts of terephthalic acid dichloride was added at once in powder form. After a few minutes, the polymerization reaction product solidified into a cheese-like shape, so the
According to the method described in Japanese Patent No. 3986, the polymerization substances were discharged from the polymerization apparatus, and immediately transferred to a two-screw closed kneader, and the polymerization reaction product was pulverized in the same kneader. Next, the finely ground material was transferred to a Henschel mixer, and an equal amount of water was added thereto for further pulverization, filtered, and washed several times in warm water.
Dry in hot air at ℃. Pale yellow P with an intrinsic viscosity of 5.6
95 parts of PTA polymer were obtained.

Incidentally, polymers having different intrinsic viscosities can be easily obtained by changing the ratio of N-methylpyrrolidone to the monomers (phenylenediamine and terephthalic acid dichloride) and/or the ratio between the monomers.

Example 1 A PPTA polymer having an intrinsic viscosity of 6.7 produced according to Reference Example was dissolved in 99.4% sulfuric acid at 70°C for 2 hours so that the polymer concentration was 19%. The dissolution was performed under vacuum, and after dissolution, the mixture was allowed to stand still for 2 hours to defoam, and then spun. This dope was anisotropic.

The dope is passed through each of the 20 spinners Q, pore 1 of 06 mφ.
The yarn was extruded through a spinneret with 1,000 yarns, allowed to run in a low-temperature space, coagulated in 25% dilute sulfuric acid at 5°C, and then 20 yarns were tied together and drawn out at a speed of 300 m/min. Next, the yarn was passed through the apparatus shown in FIG. 1, washed, oiled and dried to produce yarn f of 1500 denier.

After the 20 yarns run in parallel with a yarn spacing of 80 m, they are guided alternately to two transfer devices, and first, the yarns with even weights are transferred to the reversing belt conveyor to the maximum width including loop-shaped overhangs. It was dropped 865 meters wide and 9 meters high, and then an odd number of yarns were used to form the bridge. The width of each overlapping part was about 6 to 7 mm, and the thinnest part in the center of the nine overlapping parts was about 1 gourd. 69 made of canvas, and was devised so that the liquid entrained in the yarn could freely pass through the reversing belt conveyor.

The net conveyor is made entirely of plain weave stainless steel wire mesh, and prior to processing, the net conveyor is loaded with a power belt made of polyester fiber georgette and then enters the processing zone.

For washing, first wash with water until the sulfuric acid concentration in the water is about 1 t;
Next, it was neutralized with a 5% aqueous solution of caustic soda, and then washed with water. Next, after applying finishing oil,
Dry. Drying was carried out by moving a net conveyor in hot air at 170° C. so that the air remained there for 7 minutes.

Next, the force Verbelt was removed from the Raiyu group, and first,
The even-numbered yarns are taken up almost vertically upwards from the source all at once, and then, at a point approximately 1 meter away, the odd-numbered yarns are taken up from the source all at once, passed through a pull-out roll, and then each of the 20 10 The cheese was wound into 9 rolls in 0. The cheese was changed every 3 hours and 20 minutes and the switching operation was performed 10 times in succession.-1 A total of 200 pieces of cheese, 2,000ky as the amount of yarn, and the length of the yarn. A total of 12,000km of yarn was harvested.

During this period, there was not a single cut due to entanglement of the yarn weight, or entanglement, knotting, or cutting within the same thread. In addition, the number of single fibers floating on the surface of the cheese due to the looseness of the yarn was 3 on average per piece of cheese, and there was no fuzz at all.

The fiber physical properties of the harvested yarn are 1. The average strength value is 24.
．． The standard deviation between the 20 cheeses with the same change was 69/d, and the standard deviation between the changes was 0.139/d.

Comparative Example 1a As a comparison with Example 1, 20
All of the yarns of the weight were transferred from one transfer device to form a yarn group that was seemingly similar to Example 1 in which the yarns overlapped at their ends.

However, in this comparative example, unlike Example 1, the drying was performed using a net conveyor. The aspect of i-covering was completely different. In other words, even if we try to take up a different point for each spindle as in Example 1, the overlapping of the γ-A of the yarn weight is complicated), and they interfere with each other, resulting in disturbances, making it difficult to maintain a smooth flow. It was impossible for Natori to do so.

Also, if I picked up all @ at the same point, I was able to work more stably this way, but still, 10kl? Several weak entanglements were observed in each yarn during the 3 hours and 20 minutes of rolling it up into the cheese, and if the degree of entanglement was strong,
At the yarn running guide section, cut the yarn and cut 10 out of 20 spindles.
kl? I was satisfied with the volume, and there was no weight at all.

Comparative Example 1b Similar to Comparative Example 1a, the conditions were exactly the same as in Example 1, but only one transfer device was used, and yarn was picked up from the net conveyor at the same time for all spindles. Furthermore, unlike Comparative Example 1a, the distance between the yarns was widened to 9.5 m so that the yarns did not overlap at all. As a result, 20
Since it became impossible to deposit weights, the test was conducted by reducing the number of weights to 17.

In this comparative example, although it is surprising, almost no intertwining of the yarns with adjacent thread piles as in comparative example 1& was observed.
A 10-cut O test spinning was conducted with 10 klii windings switched for 3 hours and 20 minutes.

Intertwining between yarns was observed three times during this period, but the yarns did not break, but fluff was observed due to single yarn breakage. After closely observing the thread pile on the net conveyor, it was found that the yarn protruding from the thread pile in a loop shape was washed away by the liquid flow during washing etc., and the constituent single fibers were spread apart and spread9. It was inferred that when the protruding loop yarns of 2000 and 2000 showed the same phenomenon, the intertwining of the single fibers occurred when the two loop yarns overlapped and intertwined.

The average floating of single fibers on the surface of the cheese was 20 fibers/cheese, and the fluff was also 10 fibers/cheese, which was extremely inferior in quality compared to Example 1.

In terms of fiber properties, the average yarn strength is 24.11/d.
The standard deviation among the 17 cheeses made with the same change is
0.33g/d, standard deviation between switching is 0.1
It can be seen that at 4 g/d, the physical properties vary greatly between yarns, and therefore the average strength value is also lower than in the examples.

Example 2 Example 1 was repeated in exactly the same manner except that the reversing belt conveyor in Example 1 was replaced with reversing rolls provided independently for each of the two transfer devices. The reversing roll was made of hard vinyl chloride and had a diameter of 300 mm.

In this embodiment, the odd number of yarns is deposited on the reversing roller (19a in FIG. 4) by the transfer device (6a in FIG. 4) in front of the progress of the net conveyor, and is turned upside down. First, the yarns with even weights are placed on the net conveyor, then the yarns with even weights are deposited from the transfer device on the back side (6b in Figure 4) onto the reversing roller (19b in Figure 4), and then the yarns with yarns with odd weights are already stacked. Because the ends of the yarn piles of odd-numbered yarns were overlapped on the net conveyor carrying the yarn, the overlapping portions of yarns initially appeared somewhat bulky, but after entering the washing process. After the liquid was supplied, all the results were the same as in the examples.

As in Example 1, no yarn entanglement was observed during the 10 switching operations, and the cheese surface inspection showed that the single fibers were lifted by an average of 3. -4 pieces/cheese, and the average fiber strength is 24.69/d, the standard deviation between 20 cheeses with the same change is 0.139/d, and the standard deviation between changes is 0.14.9 /d, and PPTA fibers with the same good quality as in Example 1 could be produced.

Example 3 In the polymerization of PPTA in Reference Example, a PPTA-based polymer (η1nh=6.05) was produced by replacing 0.3 mol of the parent phenylenediamine with orthophenylenediamine. When this polymer is wet-spun from sulfuric acid, as disclosed in JP-A-54-53192, it exhibits a reddish-purple color when the acid remains, which has the advantage that it can be clearly determined that the neutralization of the fiber is incomplete. It is something.

This polymer was dissolved in 99% concentrated sulfuric acid to a concentration of 13% by weight. This dope exhibited optical anisotropy.

The dope was extruded through 10 spinnerets each having 500 pores of 0.07 φ, 5. Coagulated in water at 3°C through the cod space, and extruded at 200 m/min. It was pulled out at a speed of 1, and washed, oiled, and dried on a net conveyor in the same manner as in Example 1.

In this example, the pitch of the yarn fed to the transfer device was varied to examine the difference in processing effects on the net conveyor.

The results are shown in Table 1. By the way, when only one yarn was raked in, the maximum width of the yarn pile including the loop-shaped protruding part was 835 mg, and the height of the yarn pile was 7+.
w+, which is 9 (the dimensions of the thread pile, including those in Table 1, indicate the observed values on the reversing belt conveyor). Regarding the neutralization spots in Table 1, as mentioned above, this polymer exhibits a reddish-purple color in acidic conditions, so it can be easily determined from the degree of color spots on the surface of the rolled up cheese. The scores were mainly based on size.

From the results in Table 1, it can be seen that in Comparative Example 2, where the yarn pitch was t-85m and the yarn piles did not overlap, the gaps between the yarn piles were large, so most of the washing water and alkali It can be seen that the aqueous solution passes through the net conveyor from this part and cannot effectively penetrate through the thread pile, resulting in a low cleaning effect.

In Examples 3a to 3d, these neutralization spots were also drastically reduced, and in particular, in Examples 3b and 3c, no spots were observed at all. The unevenness in Example 3a is local, and is thought to be due to the formation of a local extremely sparse thread layer in the overlapping seams of threads, but when viewed as a whole, Comparative Example 2 Yoshi has also been greatly improved.

In addition, in Example 3d, neutralization spots were also seen, although not as much as in Comparative Example 2, and the overlapping threads of the thread piles were so thick that they were even thicker than the original thickness of the thread piles. Therefore, it is difficult to wash that area, which is why the spots appear. Also, Example 3d
After drying, some parts of the fibers were found to be insufficiently dried.

<Effects of the Invention> According to the present invention, a large number of wet-spun yarns of the above-mentioned chemical fibers, particularly PPTA fibers, can be produced with excellent quality and high productivity.

In other words, multiple spindles on a net conveyor? -% When processing the threads by stacking them in parallel as yarn piles, the yarn piles are stacked close together until the ends of the yarn piles overlap, resulting in many yarns being deposited on the net conveyor of the same width. For example, when comparing Example 1 and Comparative Example 1bt, about 18 inches more yarns could be processed, and depositing more yarns would warp and increase the processing effect on the net conveyor. This is also the same as seen in the third embodiment.

In addition, since the ends of the thread piles overlap each other and are stacked on the net conveyor for processing according to the method of the present invention, there is no disturbance during processing of the loop portions that protrude from the thread piles.
Homogeneous lines can be produced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of an apparatus used in carrying out the present invention, and FIG. 2 is a diagram showing how the yarn is formed on the auxiliary belt conveyor. ．． FIG. 3 shows the cross-sectional shape of the pile of yarn deposited on the auxiliary conveyor belt. FIG. 4 is a partial view showing another embodiment of the invention. 1 a * 1 b, l c ”・spinning device, 2a,
2b. 2 c --- spinning bath, 3 &, 3 b, 3 c
...Coagulated thread, 4 a. 4b, 4c...Change guide, 5...Take-back Shiroru, 6a, 6b...M-included device, 7,7IL
, 7b, 7c... Thread pile, 8... Auxiliary belt conveyor, 9... Net conveyor, 10... Water washer, 11.
... Oil application machine, 12 ... Dryer, 13 a, 1
3 b.--Kariyu-Kisetsu point, 14a. 14b...Short thread guide, 15a, 15b...Processed yarn (yarn), 16-...Drawer roll, 17a,
17b. 17c... winding machine, 18... Kaguar belt,
19a, 19b... Auxiliary rolls. Figure 2 Figure 3 Procedural amendment (voluntary) Date of March 1985

Claims (1)

[Claims] 1. A coagulated yarn is formed by wet spinning a chemical fiber raw material that has a characteristic that the fiber length does not substantially change in size when subjected to finishing treatment including washing or drying in a relaxed state. A plurality of coagulated yarns are then placed on a net conveyor using a transfer device to arrange the thread-like stacked layers substantially parallel to each other for finishing treatment, and then each yarn is individually taken out. In the multi-spindle spinning method for winding up chemical fibers, the supply of the plurality of coagulated yarns to the net conveyor by a transfer device is performed by a reversing mechanism, and the plurality of coagulated yarns are fed onto the reversing mechanism or the net conveyor by a transfer device. The formation of the thread pile-like pile layer is carried out so that the formation of the thread pile-like pile layer is temporally shifted at least for each adjacent yarn, and the yarn is fed and arranged later on the end of the thread pile-like pile layer of the yarn that was fed and arranged first. The feeding interval of each yarn in the width direction of the net conveyor is determined so that the ends of the thread-like stacked layers of yarns overlap, thereby forming a continuous band-like yarn pile in the width direction on the upstream side of the net conveyor. forming the layer upside down from the state supplied from the transfer device;
When a plurality of yarns are taken out from the net conveyor after the finishing treatment has been applied to the belt-shaped yarn pile layer, the timing for taking out the yarns is set so that the yarns are taken out from the pile-like pile layer of yarns arranged above. A multi-spindle spinning method for chemical fibers, characterized in that at least adjacent yarns are shifted. 2. A reversing belt conveyor disposed oppositely on the upstream portion of the net conveyor is used as the reversing mechanism, and a plurality of coagulated yarns are transferred onto the reversing belt conveyor from each of the transfer devices at least for each adjacent yarn. staggered feeding and arrangement to form the band-shaped yarn stack, and then inverting and transferring the band-shaped yarn stack onto a net conveyor below, thereby depositing a plurality of yarns from the net conveyor. 2. The method according to claim 1, wherein the yarns placed first on the reversing belt conveyor are taken out first. 3. At least two reversing mechanisms, which are disposed on the upstream portion of the net conveyor, close to the net conveyor at intervals in the traveling direction of the net conveyor, and have a rotation axis parallel to the rotation axis of the net conveyor. using a book reversing roller, feeding at least adjacent yarns of the plurality of coagulated yarns from the transfer device to different reversing rollers to form a pile-like pile of each yarn; The yarn pile layer is sequentially transferred upside down onto the net conveyor to form the band-like yarn pile layer, so that when a plurality of yarns are taken out from the net conveyor, the layer is later placed on the net conveyor. A method according to claim 1, characterized in that the yarn is first removed. 4. The thickness of the portion where the end portions of the yarn pile-like piles of adjacent yarns in the band-shaped yarn pile layer overlap is 5% to 120% of the thickness of the central portion in the width direction of the yarn pile-like piles. The method according to any one of claims 1 and 3, characterized in that: 5. Claims characterized in that the synthetic fiber having the property of not substantially changing in dimension when subjected to a finishing treatment including washing or drying in a relaxed state is a polyparaphenylene terephthalamide fiber. The method described in any one of paragraphs 1 to 4.