JP2022131794A - Shaking-off method of yarns - Google Patents

Abstract

To provide a shaking-off method of yarns capable of forming a yarn sheet tightly and orderly on a collection body from fiber yarns having a rigid and solid fiber structure and in a high speed spinning by shaking-off of yarn bodies in a forward/rearward- or left/right-movable manner without irreguralities.SOLUTION: A multifilament yarn is spun; after a coagulation-regeneration processing is substantially complete, the yarn is pulled and moved forward by a fluid jet accompanying traverse movements, and is collected and accumulated on a collection device face at a distance while a fluid speed from an air outlet of the fluid jet substantially maintains a yarn speed. The collection device has a fluid passable-structure; by providing a fluid suction recovery mechanism comprising a fluid suction apparatus on a back face of the collection face, a yarn sheet is accumulated tightly without irregularities.SELECTED DRAWING: Figure 2

Description

The present invention relates to wet spinning processes used to produce man-made fibers. More specifically, it relates to a method for shaking off multifilament yarns in the process of manufacturing artificial fibers.In particular, it improves the ability to shake off yarns that are hard and difficult to fold, which are inherent to high-strength and high-rigidity fibers. It is about how to

BACKGROUND ART Conventionally, a wet spinning method has been mainly used as a manufacturing method for fibers having high strength and high elasticity. For example, high-strength, high-modulus fibers such as paraphenylene aramid fibers, polybenzazole fibers, and solvent-processed cellulose fibers are characterized by high melt resistance associated with the rigidity of their fiber structure. . On the other hand, the melt spinning method cannot be adopted as the manufacturing method.
Therefore, the wet spinning method is mainly used in these fiber manufacturing processes (see, for example, Patent Documents 1 and 2).

The manufacturing method common to these fibers is the step of dissolving the polymer that forms the fiber in a solvent to prepare a spinning dope solution, the step of spinning from the dope solution by wet or air gap, and so on. It consists of a process of scouring and drying the yarn obtained by
Any fiber is spun into a coagulating or non-coagulating medium (air in the case of air-gap) to form a filament. In the process of forming the fibers, the fibers are stretched and thinned, coagulated and regenerated, and then scouring is performed to remove non-fiber components such as the solvent used to dissolve the polymer forming the fibers. A treatment followed by a drying step is essential.

On the other hand, in terms of industrial fiber production, it is required to increase the spinning speed in order to reduce the production cost. there is A wet spinning apparatus for solving these problems has, for example, the configuration shown in FIG. 1, and manufactures artificial fibers through the following steps.

The outline is as follows.
1. The dope 1 is passed through a filter medium made of a metal mesh, subjected to biaxial kneading and defoaming, and then pressurized to maintain the temperature of the dope at a high temperature. spin out. 2. The spun dope 1 passes through a quench chamber (in the case of air-gap spinning) 4 that constitutes a draw zone in which a fluidized bath is provided below the spinneret 2, is cooled to a predetermined temperature, and is then cooled to a coagulation bath. 5.
3. After passing through the coagulation bath 5, the multifilament filament 3 is led to a regeneration bath (13) using water or the like. This regeneration step is a step of desolvating the solvent present in the fiber. After that, the surplus liquid is squeezed by a plurality of squeeze rollers 6 while tension is applied.
4. After that, the filament 3 that has passed through the recycling process is placed on the first conveyor 8 via a pair of shake-off rollers 7 and a traverse 7a. Further, the filamentous body 3 is reversed and placed on the second conveyor 9 whose traveling direction is opposite to that of the first conveyor 8. - 特許庁
5. The second conveyor 9 is driven at a constant speed, and undergoes a scouring step (cleaning section 14) in which a scouring device 10 consisting of a water injection device is provided above the second conveyor 9 and a drying step in which a drying device 11 is provided. After that, the filamentous body 3 is wound by the winder 12 .
Here, the first conveyor 8 and the second conveyor 9 use a mesh or a perforated plate from the viewpoint of improving liquid permeability and air permeability in the scouring process and the drying process.

Between the coagulating bath step and the scouring step, there is a step of folding the linearly progressing fiber yarn into a sheet on the surface of the collector and depositing it as a yarn sheet. This is called a transfer section, and its operation is called a transfer operation or a shake-off operation.
This operation is the same as in 1. above. ~ 5. It is an important point in the process of , and its quality is an important control point that greatly affects the scouring, drying, and unwinding properties in the subsequent processes.

JP-A-59-1557316 JP-A-2001-49527 Japanese Patent Publication No. 47-29926

The object of the present invention is the above 4. 2. Folding the linearly thrown-off fiber thread into a sheet on the collection device and depositing it as a thread sheet.

By the way, when the yarn is shaken off to the collection device, if the yarn is flexible, there is no big problem. A phenomenon called “swinging down while excessively swinging” occurs. As a result, a problem arises in that the formation of the thread sheet is disturbed.
Generally, as shown in FIG. 1, the shake-off operation is generally performed by arranging a pair of shake-off rollers 7 relative to each other and allowing the yarn to pass through the gap between them. The thread is advanced by gripping and meshing between the rollers 7, and the thread is shaken off by its own weight at the separating point of the rollers.

At this time, if the yarn is soft and flexible, it is shaken off smoothly, and the fibers deposited on the collection device form a tight, orderly and uniform yarn sheet.
After the yarn sheet deposited on the collecting device is deposited in an orderly and tight state according to the traverse width, it is reversely transferred from the first conveyor to the second conveyor and sandwiched between the two conveyors. to proceed to the process after scouring.
The point of the process is to form a sheet of yarn on the collecting device in such a manner that the yarn sheet is densely and neatly deposited.

This accumulation state greatly affects subsequent scouring, drying, unwinding, and winding properties, and thus becomes an important process control factor. This is called yarn sheet formation, and its goodness or badness is related to sheet turbulence and the unit consumption of scouring liquid in the scouring section, and sheet scattering and uneven drying in the drying section, as well as the consumption of steam and electric power, which are sources of drying. Related to unit deterioration. Also in the unwinding part, it has a great influence on the tailing of adjacent weights to the yarn sheet, loop cutting, and the like.

A cellulose fiber with contrast will be described below as an example.
In the case of yarn produced by a general viscose method or cupra method (see, for example, Patent Document 3), the above method does not cause any major problems.
However, in the case of solvent-processed cellulose fibers, a problem arises in the ability of the yarn to shake off at the transfer section.

Even with the same cellulose fiber, when the solvent method is used, the thread forms a rigid fiber structure during the coagulation step. Therefore, a high-strength, high-elasticity yarn can be obtained in the coagulation and regeneration stage, but conversely, as a result of acquiring such properties, the yarn is stiff, and due to its hardness, the yarn swings. Dropping is not performed smoothly, and it falls and piles up in a state of rampage in the front, back, left and right.

This makes it difficult to form the yarn sheets into a tightly and neatly stacked shape on the stacking conveyor. Such a state is called a bad yarn sheet formation.
If the sheet formation is poor, the yarn sheets of the adjacent weights are entangled or overlapped, causing phenomena such as tailgating, which impedes the unwindability of the yarn after scouring and drying. In addition, the scouring property itself is deteriorated, and the unit consumption of the scouring solution is deteriorated. This is a phenomenon that causes extremely serious damage industrially.
A similar phenomenon is commonly observed in paraphenylene aramid fibers, polybenzazole fibers, etc., which have a rigid fiber structure.

The present invention improves the shake-off property of yarns that are hard and difficult to fold, which are possessed by high-strength and high-rigidity fibers, and improves the ability to shake off yarns that have a rigid and hard fiber structure and in high-speed spinning. To provide a method for shaking off a yarn capable of tightly and orderly forming a yarn sheet on a collecting body without disturbing the shaking off of the yarn in the front, back, left and right directions.

In order to achieve the above object, the present invention spins a multifilament yarn, substantially completes coagulation and regeneration treatment, then pulls and advances the yarn with a fluid jet accompanied by traverse motion, and the fluid jet It is collected and deposited on the surface of the collection device at a distance between which the fluid velocity from the blowout port substantially maintains the yarn speed, the collection device has a fluid-permeable structure, and the fluid suction device is provided on the back side of the collection surface. To provide a yarn shaking-off method characterized by accumulating a yarn sheet tightly and without disorder by providing a fluid suction recovery mechanism by means of

The fiber yarn applicable to the present invention includes not only solvent-processed cellulose, but also paraphenylene aramid fiber, polybenzazole fiber, etc., which have high strength and high elasticity, and whose fiber structure is rigid and melt-resistant. It can also be suitably applied to fiber yarns having

Also, it is desirable that the jet fluid of the fluid jet is compressed air.
The fluid medium of the jet may also be superheated steam to impart relaxation to the fiber structure and make the yarn less stiff.
The fluid jet can be an incompressible fluid liquid. It can be advantageously applied when the yarn speed is high or when the yarn bundle has a high fineness.

According to the method of the present invention, when a fibrous yarn having a characteristic of being stiff and resistant to bending, such as paraphenylene aramid fiber, polybenzazole fiber, and solvent-processed cellulose fiber, is deposited on a conveyor, the orderliness and tightness of the yarn sheet are evaluated. have the effect of ensuring the
In the formation of the yarn sheet, not only the weight of the accompanying liquid, but also the forward force of the fluid jet and the short flight distance are combined to suppress the swinging of the shake-off yarn back and forth and to the left and right. A sheet formation can be formed that follows the movement of the traverse device.
As a result, it leads to improvement in the scouring efficiency and the drying efficiency in the subsequent scouring process and drying process.
In the scouring process, it can be confirmed that the basic unit of the scouring liquid is improved to a level of more than half. A similar effect can be confirmed in the drying process. As a result, the energy unit consumption of the process can be significantly improved, and the effect as an energy-saving process can be enhanced.
In addition, it is possible to avoid joining troubles due to crossover yarns between adjacent weights, and to achieve smooth unwinding of the yarn sheet at the stage of the unwinding process.
Formation of orderly yarn sheets contributes to minimizing the gap distance between the yarn sheets, which greatly contributes to the improvement of facility productivity.

FIG. 4 is an explanatory diagram showing a technique related to the method of shaking off the yarn of the present invention; FIG. 2 is an explanatory view showing an example of a fluid jet nozzle used in the yarn shake-off method of the present invention; FIG. 5 is an explanatory view schematically showing the difference between the yarn passage and the fluid flow path of the fluid jet with respect to the fluid jet nozzle used in the yarn shake-off method of the present invention; FIG. 2 is an explanatory view showing an example of a fluid jet nozzle used in the yarn shake-off method of the present invention; FIG. 4 is an explanatory diagram showing the relationship between the fluid jet, the transfer distance, the collection conveyor, and the suction box in the yarn shake-off method of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a wet spinning apparatus for manufacturing artificial fibers of the present invention will be described below with reference to the drawings.

By the way, in the above conventional wet spinning apparatus, a pair of rolls having a special structure is used as the shake-off roller 7 as described above.
In this shape feature and positional relationship, a certain distance is generated between the shake-off roller 7 and the collection device serving as a receiving tray for the shake-off.
High orderliness and tightness are required for the stacking condition of the shaken-off fiber sheets. A task for realizing this is called a seat formation task.
With relatively soft cellulose fibers such as the viscose method and the cupra method, this problem of sheet formation does not become apparent, but with hard fibers, the fibers are in a wire-like state rather than fibrous, and are shaken off. During the process, it is observed that it swings back and forth and left and right while swinging down.
Hard fibers or flexible fibers can be classified according to the tendency of the fiber bundle itself to collapse and bend when the bundle of multifilament yarns is set up in a wet state. Hard fibers are hard to bend and hard to fall down. It represents the degree of self-bending properties of the wet yarn.

The thread sheet is usually formed by swinging the traversing device and advancing the collecting device. The yarn itself swings left and right by the traverse device, but due to the stiffness of the yarn, it swings back and forth and swings down due to excessive swing in the left and right direction.
It has been found that if the yarn has a flexible property, the yarn sheet will move substantially according to the swing of the traverse, so that an orderly and tight sheet will be formed.

Therefore, in the case of hard fibers, the present inventors focused on the distance between the yarn release point of the shake-off device and the formation point of the yarn sheet on the surface of the collecting device (transfer distance), the speed of the yarn, etc. As a result of the study. have arrived at the present invention.

An example of a fluid jet is shown in FIG.
In FIG. 2, 21 is a nozzle body, 22 is a yarn introduction pipe, 23 is an acceleration pipe, and 24 is a fluid supply port.
In the illustrated fluid jet, the acceleration tube 23 has a certain length compared to the nozzle body, but the acceleration tube itself is not essential and may be omitted depending on the conditions.
In wet spinning, the yarn itself is in a liquid-containing wet state accompanied by a coagulated and regenerated liquid, so if the passage of the yarn is long, the yarn is decelerated due to contact resistance with the tube wall, and substantial overfeed occurs in the tube. A state will be formed. As a result, the yarn becomes entangled or bulky. The convergence resulting therefrom may be advantageous in some cases in post-processes or processing steps in the field of application, but it may also be inconvenient, so it is necessary to adjust it according to the purpose. A certain length of the acceleration tube is provided if the yarn is desired to be converged, otherwise the acceleration tube may be omitted.
The pressure of the fluid jet medium should be changed according to the yarn speed. Moreover, it is necessary to select suitable conditions for each of the compressible fluid and the incompressible fluid, which are different.

The pulling force of the yarn by the fluid differs depending on whether the fluid is compressible or incompressible. In the case of compressible fluid, about five times the yarn speed is required. In the case of an incompressible fluid, about twice the flow velocity is required.
At a spinning speed of 200 m/min, a compressible fluid requires a flow rate of 200×5=1,000 m/min. This is 17 m/sec when converted as an air wind speed. If the spinning speed is 1,000 m/min, a compressible fluid requires a flow rate of 1,000×5=5,000 m/min. This is 83 m/sec when converted to the air wind speed.
For a compressible fluid, for example water, a spinning speed of 200 m/min requires a flow rate of 200×2=400 m/min. From the relational expression between pressure and liquid velocity, 6.7=14×ΔP ^1/2 , ΔP=0.28 kg/cm ² . Similarly, when the spinning speed is 1,000 m/min, a flow rate of 200×2=400 m/min is required.
Needless to say, it is necessary to realize a fluid condition with an appropriate traction speed for both compressible and incompressible fluids.

If a feed roll is provided before the fluid jet, the yarn pulling speed by the fluid jet must exceed that speed. In that case, it is necessary to determine the injection speed while checking the relationship between pressure and tension.
The yarn pulling tension generated by the jet is on the order of 0.01 grams per denier. The yarn tension is lower than the spinning tension during coagulation.
When the pressure drops and the speed drops, it wraps around the supply roll. In other words, in the case of "the force of winding around the supply roll <the force of pulling away by the jet," tension is generated, but in the case of "the force of winding around the supply roll > the force of pulling away by the jet," It will wrap around the supply roll. It is necessary to confirm the critical pressure, critical speed and yarn tension.

FIG. 3 shows the positional relationship between the yarn introduction path (yarn introduction port 33) of the jet nozzle and the compressed air introduction path (fluid introduction port 34) of the air jet.
As shown in FIG. 3, in the case of the confluence point 31 of the yarn introduction path and the fluid introduction path (when both are close to each other), the straightness of the ejected yarn is low, and the yarn introduction path and the fluid introduction path merge. In the case of point 32 (where there is a distance between the two), the straightness of the yarn becomes high.
In a straight pipe with a long wet yarn, the yarn conveying is braked due to contact with the pipe wall, resulting in a substantial overfeed condition. For the purpose of non-contact transfer, it is desirable to squeeze the adhering liquid as much as possible, shorten the length of the nozzle, and reduce the diameter of the tube to a non-contact type. In order to propel the yarn forward, it is preferable that the confluence of the yarn and the air be on the side of the flight opening rather than on the back side of the flight opening, and such a structure is suitable for straight flight of the yarn.

Appropriate compressed air pressure conditions are clarified by measuring the jet inlet tension of the yarn being pulled. The point here is the yarn tension, which is low at about 0.01 g per denier. But it can be towed.
Compared with the spinning tension during coagulation, the tension during transfer is 1/10 or less.
In central spinning, which is a typical spinning method based on the viscose method, the inner layer winding tension is 0.01 g or less per denier, so there is no problem if a pulling tension of about 0.01 g per denier is generated.
The air jet gives the yarn a traction force for advancing, but after passing through the jet device, the yarn containing the accompanying liquid is thrown into a yarn sheet shape by a shake-off mechanism based on its own weight.

A short transfer distance is sufficient. It is preferable that the fluid is collected by the net while maintaining its velocity without spreading.
As described above, the forward conveying force for feeding the yarn is originally due to the fall of the yarn containing the accompanying liquid due to its own weight. The condition is that the brake does not apply to that force.

The traverse motion is a mechanism for repeatedly swinging the yarn in the direction perpendicular to the traveling direction of the collecting device, and is an indispensable mechanism for sheet formation. This is accomplished by mounting the jet nozzle itself on top of the traverse mechanism.

It is preferred that the collector surface be fluid permeable except for some low speed conditions. When the spinning speed or jet speed is low, fluid permeability may not be required, but a net is a suitable collection surface structure under industrially applicable production conditions. Since the net mesh, wire diameter, and void ratio based thereon vary depending on the yarn speed (spinning speed) and fineness (denier/decitex), it is necessary to select optimum conditions accordingly.

It is desirable that the collecting device should be fluid-permeable, and for that purpose, it is desirable that the collecting device has a perforated shape such as a net or a punching sheet.
Further, a suction device is arranged on the lower surface of the collection device to form a suction structure. By doing so, the yarn sheet can be formed smoothly during collection, and the yarn can be deposited in close contact with the collection surface. It is also useful to prevent the yarn sheet from being disturbed by fluid scattering after the yarn is conveyed. The yarn sheet is turned over when it is transferred from the first conveyor 8 to the second conveyor 9, but since the sheet is prevented from collapsing at that time, it is strongly resistant to the yarn sheet collapsing due to the subsequent strong flow of the scouring liquid. show gender.

The distance between the ejection surface of the fluid jet and the surface of the collection device, which is the landing surface, is called the transfer distance, which is an important process factor. Since the distance is a rigid fiber, it is preferable to set it short in order to limit the swinging range of the shake-off to the swinging range of the traverse. Two factors are closely related to distance setting. It is velocity attenuation of the fluid and smooth sheet deposition on the collection surface. A suitable distance is within 50 mm, more preferably within 30 mm.

Also, in the case of stiff yarn, this distance is important. It is also possible to set within 10 mm. In combination with positive shake-off force, it is possible to form a very favorable yarn sheet formation.
The threads are folded and piled up to form a thread sheet.

The folding status can be represented by the degree of superposition. The degree of superposition can be represented by "length of thread/length of movement" per unit time. The moving length is traverse width (mm/turn)×traverse rotation speed (turns/min). The degree of superposition can be appropriately selected within 100. Since the degree of overlap is also related to the basis weight of the yarn sheet, which will be described later, it is also necessary to select suitable conditions.

Observing the yarn shake-off motion, yarn drop motion that deviates from the traverse range may occur, which leads to a tendency to excessively swing due to the stiffness of the yarn. In addition, due to the hardness of the yarn, the swing width of the shake-off yarn tends to increase in the traveling direction of the collecting device. Such excessive rocking in shake-off is caused by the stiffness of the yarn.
The stiffness of the yarn is observed to be higher than that of the rayon yarn. Therefore, the folding at the traverse turns becomes a large figure 8 shape. The remittance problem is the core issue of the relaxation process by the remittance sheet forming process. This is an issue that cannot be avoided as long as this process is carried out.
Yarn sheet formation is not formed in an appropriate manner for reasons such as the fact that the yarn shakes off while swinging back and forth and left and right due to the hardness of the yarn, and that the release point is not constant due to adhesion to the roll surface.

The basis weight of the yarn sheet is an important control point in actual production conditions. There is an appropriate value for the basis weight in terms of scouring property and drying property, and it is not preferable if it is too high or too low. For example, a basis weight of 700 g/m ² is too high and a basis weight of 200 g/m ² is too low. If it is too high, it increases the size of the equipment (longer processing times are required) and increases the solvent residue content of the yarn. If it is too low, the unit consumption of scouring liquid for scouring will increase, resulting in an increase in the size of the equipment. Moreover, the heat source unit consumption for drying is deteriorated.

The case of solvent-processed cellulose fibers, which are suitable targets for the process of the present invention and which are comparable to fibrous materials of the same fiber polymer, will now be described in more detail.
In solvent method cellulose fibers, cellulose-based regenerated fibers produced from a dope solution with an ionic liquid, such as imidazole-based solvents, which are subsequently known solvents, are typified by NMMO solvents that have been publicly known and used in advance. The shake-down disturbance phenomenon due to In particular, this is remarkable in the case of regenerated cellulose fibers produced from dopes containing ionic liquids such as imidazole solvents.
The reason for this is that after reclaiming, the yarn before scouring is highly sticky to the roll, and there is a tendency to wind around the roll, resulting in defective transfer.
Similar phenomena are avoided when rayon yarns or cupra yarns, which are the same cellulose fiber materials, are passed through the same process, and similar phenomena are avoided when yarns that have completed coagulation and regeneration are passed through the same process. This phenomenon is presumed to be caused by the high viscosity of the desolvating solution itself in the process of regenerating the imidazole-based solvent dope solution.
In addition, if the surface lining material of the roll is changed to a non-adhesive material such as soft vinyl chloride, polyurethane, polytetrafluoroethylene, etc., the tendency of roll winding and swinging back and forth and left and right will be reduced. Although some improvements can be seen, there is no fundamental change and it is not a drastic solution.
Observation was made with a polytetrafluoroethylene sheet lining, but no improvement was observed. Because the thread is stiff, it bends at the turns of the traverse, and the folded sheet is not formed well.
For these reasons, it is considered that the difficulty of solving problems with the blade roll method is high. As a result, we have expanded the solutions such as the traction method using the fluid jet, and have been promoting the establishment of the technology. It was also revealed that
In any case, the transfer problem is a problem of the balance between adhesion and peeling, and it was found that the method of the present invention is highly effective as a shake-off method when the adhesion is strong and the yarn to be transferred is hard. rice field.

In addition, it is practically important to improve the operability of threading the jet nozzle. Therefore, it is desirable to use a splitter type structure. An example is shown in FIG.
The illustrated jet nozzle has a split structure, and consists of a nozzle main body side 41 and a nozzle cover side 42. In this case, the yarn passage is provided on the main body side.
Here, in FIG. 4, 43 is a fluid discharge hole, 44 is a fluid introduction path, 45 is a thread body, 46 is a hinge portion side connecting the nozzle body and the cover portion, and 47 is a tightening and sealing side.
When threading, it is possible to open the lid side of the nozzle while pulling the thread with an air sucker, thread the thread, then close the lid side and seal the lid side and the main body side with a scale vise or the like. can.

FIG. 5 shows an example of a transfer section suitable for the method of the present invention. A yarn supplied from a godet roll 52 serving as a yarn supply roll is propelled forward by a jet nozzle 53 having a traverse 54 mounted thereon. After that, it passes through the transfer distance 55 and is collected on the surface of the collecting device, in this case, on the surface of the reversing conveyor 56 (the first conveyor 8 in FIG. 1).
The reversing conveyor 56 is composed of a fluid-permeable surface such as a net, and a suction box 57 is installed on the back surface of the reversing conveyor 56 for vacuum suction. The reduced-pressure suction mechanism sucks the fluid of the fluid jet without scattering it, so that the yarn conveyed by the jet can be tightly and uniformly formed into a yarn sheet, and the yarn can be gripped and fixed effectively.
The yarn sheets stacked on the reversing conveyor 56 are reversed and stacked on the main conveyor 58 .
A reversing conveyor may utilize a second conveyor.

For filaments with hard properties, the single filament thinning of the supplied filaments can be used to reduce the bending strength to facilitate filament sheet formation. It is also conceivable to add a softening agent to them to soften the yarn.
However, the single filament fineness of the multifilament yarn is a property dependent on application requirements, and cannot be determined solely by the requirements of the manufacturer. In addition, since the coagulation, regeneration, and scouring liquids are basically collected and recycled, it is not desirable to bring in new ingredients, but they should be ingredients that do not affect recovery and recycling. May be adopted if available.
In addition, if the above constraints meet the requirements of the end use, and if there is no problem in using them together in the manufacturing process, they can be used together.

The problem of transfer failure is a problem that ultimately leads to the performance of sheet formation. In addition to the above-mentioned problem of shake-off property, poor sheet formation due to yarn hardness has a wide range of negative effects on facility productivity, scouring property, drying property, unwinding property, winding property, and the like. These effects lead to higher equipment costs, higher energy costs, and lower yields of first-class products in industrial production. As a result, it directly leads to an increase in the manufacturing cost of the product.

Although the method for shaking off yarn according to the present invention has been described above based on the embodiments thereof, the present invention is not limited to the configurations described in the above embodiments, and the present invention is not limited to the scope of the invention. The configuration can be changed as appropriate.

According to the method of shaking off the yarn of the present invention, the yarn sheet can be formed very neatly and tightly in the shaking off operation by the yarn body for the filament yarn which is highly rigid and rigid. Therefore, it prevents troubles in the scouring process and the drying process, prevents entanglement troubles between yarns such as floating yarns straddling between spindles, and contributes to efficient operation of scouring and drying properties. Of course, there is no problem even if it is used when the hardness of the yarn is flexible, and it can be widely applied regardless of whether it is newly installed or existing.

1 dope 2 spinneret 3 thread (multifilament)
4 Quench chamber (draw zone)
5 coagulation bath 6 squeeze roller 7 shake-off roller 7a traverse 8 first conveyor 9 second conveyor 10 refining device 11 drying device 12 winder 13 first washing section 14 second washing section 21 nozzle main body 22 yarn introduction pipe 23 acceleration pipe 24 Fluid supply port 31 Junction point of yarn introduction path and fluid introduction path (when both are close to each other)
32 Junction point of yarn introduction path and fluid introduction path (when there is a distance between them)
33 Thread introduction port 34 Fluid introduction port 41 Main body side of split-type fluid nozzle 42 Lid side of split-type fluid nozzle 43 Fluid discharge hole 44 Fluid introduction path 45 Thread 46 Hinge part side connecting nozzle main part and lid part 47 side to tighten and seal 51 throttle bar 52 feed roll (godet roll)
53 Jet Nozzle 54 Traverse 55 Transfer Distance 56 Reversing Conveyor 57 Suction Box 58 Main Conveyor (Second Conveyor)

Claims (7)

In a method for shaking off a multifilament yarn in the process of manufacturing an artificial fiber, the multifilament yarn is spun, and after the coagulation and regeneration treatment is substantially completed, the yarn is pulled and advanced by a fluid jet accompanied by traverse motion. and collected and deposited on the surface of the collection device at a distance between which the fluid velocity from the outlet of the fluid jet substantially maintains the yarn speed, the collection device has a fluid-permeable structure, and the collection surface A method for shaking off a yarn, characterized in that the yarn sheet is accumulated tightly and without disturbance by providing a fluid suction recovery mechanism by means of a fluid suction device on the back surface. 2. The method of shaking off a yarn according to claim 1, wherein the multifilament yarn is a solvent-processed cellulose fiber yarn. 2. The yarn shaking-off method according to claim 1, wherein the multifilament yarn is a paraphenylene aramid fiber yarn. 2. The yarn shaking-off method according to claim 1, wherein the multifilament yarn is a polybenzazole fiber yarn. The yarn shaking-off method according to any one of claims 1 to 4, wherein the fluid jet is compressed air. The method for shaking off yarn according to any one of claims 1 to 4, wherein the fluid jet is superheated steam. The method for shaking off yarn according to any one of claims 1 to 4, wherein the fluid jet is an incompressible medium liquid.

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