JP4880979B2 - Yarn breakage treatment apparatus and yarn breakage treatment method - Google Patents

Description

  The present invention relates to a yarn breakage treatment apparatus for treating a yarn breakage generated in a drawing device for drawing an undrawn yarn of thermoplastic synthetic fiber made of polyester fiber, nylon fiber, aramid fiber such as wholly aromatic polyamide, and the like. The present invention relates to a yarn processing method. In particular, the present invention relates to a yarn breakage treatment apparatus and a yarn breakage treatment method that can be suitably used for treating yarn breakage that occurs when performing a drawing process while simultaneously running a plurality of undrawn yarns in parallel on a drawing roller.

  Conventionally, in the melt spinning process, dry spinning process, wet spinning process or dry / wet spinning process, an undrawn yarn is produced by spinning a polymer from a group of spinning holes formed in a spinneret. Furthermore, a plurality of undrawn yarns are simultaneously spun together with a plurality of spinneret groups. Thus, the undrawn yarn obtained in the spinning process does not exhibit physical properties such as high strength, high toughness, and high durability because the polymer molecules are not sufficiently oriented.

  Therefore, after winding the unstretched yarn once after spinning or without winding it, it is supplied to the stretching step as it is after the spinning step, and the unstretched yarn is stretched under heating to stretch the polymer molecular chain. Obtaining an oriented stretched yarn is performed, and by stretching the unstretched yarn in this manner, a high-quality highly oriented stretched yarn excellent in physical properties such as high strength, high toughness and high durability is produced.

  Usually, in the drawing process for producing this drawn yarn, the undrawn yarn is from several times in a state where a large tensile tension is applied over a single stage or a plurality of stages between a pair of heating rollers having a speed difference. It is stretched ten times and wound as a drawn yarn package by a winder. Therefore, in this drawing process, since severe drawing conditions are loaded on the undrawn yarn, the undrawn yarn has not been able to withstand the harsh conditions, and the situation where it is easy to break has emerged. In the drawing process, yarn breakage frequently occurs.

  In recent years, for the purpose of improving productivity, not a single undrawn yarn but a plurality of undrawn yarn groups are supplied in parallel onto a drawing roller, and these undrawn yarn groups are simultaneously subjected to a multi-bottle drawing treatment. Each of the drawn yarns has been individually wound up as a drawn yarn package.

  However, in the case of this multi-bottle drawing process, a large number of undrawn yarn groups are simultaneously supplied onto the drawing roller. Therefore, even if a single yarn in the supplied undrawn yarn group is broken, the broken yarn is wound around the drawing roller to cause a thickening to the adjacent yarn. This affects the yarn and causes the yarn adjacent to the broken yarn to be broken one after another.

  If such a situation occurs, it will eventually be wound up for each spindle to obtain as many full-wrapped yarn packages as possible, but incomplete winding (small winding) Therefore, the product value as a yarn package is reduced. Further, as a matter of course, since the desired number of complete packages cannot be obtained, there arises a problem that the manufacturing yield is deteriorated.

  Furthermore, as described above, when the yarn that has been cut off is wound around the drawing roller, and the winding of the wound yarn progresses, unless the wound yarn is removed from the drawing roller, the best drawing process can no longer be continued. The worst happens. Then, it is sufficient if there is an appropriate means for removing the wound yarn while the drawing apparatus is operated, but there is no such appropriate means. For this reason, after all the yarns being drawn are cut and sucked by a suction tool such as a suction gun, the drawing device is temporarily stopped for reasons such as ensuring the safety of removing the wound yarn. The operator needs to remove the wound yarn from the stretched roller that has been stopped.

  In this case, it goes without saying that the yarn group being wound becomes a small package as described above and becomes a defective package that is not fully wound (completely wound). However, above all, when the unstretched yarn spun in the spinning process is directly connected to the drawing process and directly drawn in the spinning direct drawing process in which the spinning process is directly connected to the drawing process. Is a more serious problem.

  This is because, in the direct spinning drawing process, it is not permitted from the relationship of production loss to interrupt the spinning process as the drawing process is interrupted. That is, if the spinning process is interrupted, a great amount of time and a complicated yarn breaking process are required not only for the drawing process but also for the re-starting of the spinning process. For this reason, usually, even if the yarn breakage occurs in the drawing process, the spinning process is continued as it is.

  If it does so, the thread | yarn spun in a large quantity in a spinning process will turn into a waste thread before the yarn-breaking process produced in the extending | stretching process is complete | finished, and a remarkable production loss will be caused. In addition, the waste yarn generated in large quantities needs to be subjected to post-treatment such as incineration and recycling, which also has a serious problem in production cost. Therefore, it is required to process the broken yarn generated in the drawing process quickly and without production loss.

  However, as far as the present inventors are concerned, there is currently no known prior art for processing the broken yarn generated in the drawing step in the drawing step in which the broken yarn is generated. For example, in Patent Document 1 (Japanese Patent Publication No. 51-46176), Patent Document 2 (Japanese Patent Laid-Open No. 7-101630) and Patent Document 3 (Japanese Patent Laid-Open No. 8-108975), in the direct spinning process or the spinning process, However, only a technique for performing a yarn breaking process in the spinning process, not in the drawing process has been proposed.

Japanese Patent Publication No. 51-46176 JP-A-7-101630 JP-A-8-108975

  The present invention has been made in order to solve the above-described problems of the prior art, and its purpose is to cut the cut end of the broken yarn even if the yarn breaks in a certain weight during the drawing process. By preventing the yarn from being wound around the drawing roller, the yarn breaking process can be carried out in the drawing process without spreading the yarn from the broken yarn generating weight to the adjacent weight or stopping the drawing device once. An object of the present invention is to provide a yarn breakage treatment apparatus and a yarn breakage treatment method that can be carried out in a complete manner.

Here, as the present invention for achieving the above-described problems,
(1) A position where yarn breakage occurs during a drawing process in a multiple spindle drawing device in which a plurality of undrawn yarn groups made of thermoplastic synthetic fibers are parallelly drawn between a pair of drawing rollers having a speed difference and are drawn simultaneously. A slit-shaped all-wound yarn for sucking and capturing the yarn end caused by the occurrence of yarn breakage on the yarn exit side of the drawing roller located immediately upstream with respect to the drawing roller . A yarn breakage treatment device for a multi-bore stretching device, characterized in that a suction opening longer than the running width is provided,
(2) The multifilament stretching apparatus according to (1), wherein the suction opening is provided in a suction head made of a cylindrical hollow body provided in parallel to face the stretching roller. apparatus,
(3) Using the yarn breakage treatment device according to (1) or (2), the yarn breakage treatment method of the multi-bore drawing device, wherein the yarn breakage treatment that occurs in the drawing step is performed,
(4) The yarn breakage treatment method of the multi-bore stretching apparatus according to (3), including a spinning step directly connected to the stretching step as a pre-step of the stretching step,
(5) Continue to suck the yarn end caused by the breakage occurring during the drawing process by the suction head, and when the full winding of the drawn yarn that has been drawn is completed, re-thread it onto the multi-bore drawing device ( 3) or the yarn breakage treatment method of the multi-spindle drawing apparatus according to (4), and
(6) A yarn breakage treatment method for a multi-bore stretching apparatus according to any one of (3) to (5), wherein a gap between the stretching roller and a suction opening facing and close to the stretching roller is 1 to 30 mm. .

  According to the present invention described above, even when a thread breakage occurs in a weight in a multi-bore stretching apparatus, the thread end that is threaded together with air can be sucked and captured from the suction opening. It is possible to prevent the wound yarn from being wound. Therefore, it is possible to prevent the adverse effect that the yarn that has been cut as before is wound around the drawing roller and becomes thicker, and the yarn is spread to the adjacent weight. Should be implemented. Further, there is no need to stop the drawing machine once to remove the yarn wound around the drawing roller. For this reason, the worker is freed from the conventional troublesome yarn processing operation, and the amount of waste yarn generated can be greatly reduced, production loss can be reduced, and the production yield can be greatly improved. It has a remarkable effect that it can be done.

  The yarn breaking treatment to which the present invention is directed relates to the yarn breaking treatment that occurs when thermoplastic synthetic fibers made of aramid fibers such as polyester fibers, nylon fibers, wholly aromatic polyamides, etc. are drawn in parallel with multiple spindles. It is. Regarding the yarn breaking phenomenon that occurs in such a stretching process, the present inventors first continuously photographed the situation during stretching as a moving image using a high-speed video camera. Then, by reproducing and analyzing the captured moving image, the behavior that occurs when the yarn breaks was analyzed. Then, the present inventors have found that the phenomenon described below occurs when the yarn breaks, and have conceived the present invention based on this knowledge.

Hereinafter, this will be described with reference to FIGS.
FIG. 1 shows that in a stretching process, a multi-threaded yarn group Y of two or more spindles (shown in the case of a four-threaded yarn group) travels simultaneously on the stretching roller 1 in the direction indicated by the arrow. It is explanatory drawing which showed typically the example of embodiment currently performed. Further, the embodiment of FIG. 1 exemplifies a case where a multi-thread yarn group Y that has already been drawn and comes out of the drawing roller 1 is drawn. Reference numeral 2 indicates a guide roller.

  Next, FIG. 2 is a diagram for explaining the yarn breaking behavior elucidated by the moving image analysis performed by the present inventors, and the time-lapse of the running yarn Y when the yarn is broken at a certain weight. It is a schematic side view showing a series of behaviors. In FIG. 2, the solid line shown in FIG. 2 is a normal running yarn Y1 without breaking the yarn, the one-dot chain line shown is the yarn Y2 just after the yarn breakage, and the two-dot chain line shown is the drawing roller 1. The yarn Y3 in a state to be wound is shown.

Hereinafter, based on the schematic explanatory diagram of FIG. 2, the idea of the present inventors will be described with respect to a mechanism for generating a so-called “rolling yarn with roller winding”.
As schematically shown in FIG. 2, the yarn Y <b> 1 before the yarn breakage occurs between the drawing roller 1 and the drawing roller 1 by the driving force that drives the drawing roller 1 and the guide roller 2 in the direction of the arrow during the drawing process. A tensile tension is applied between the guide rollers 2. Accordingly, the yarn Y1 in the normal running state runs straight from the drawing roller 1 to the guide roller 2.

  When the yarn Y1 that normally runs in this way is broken on the downstream side of the drawing roller 1, the broken yarn Y2 is released from the tension acting on the yarn Y1 as shown. And behaves like a momentary lift. In addition, at this time, one yarn end formed by the yarn breakage is pulled by the drawing roller 1 under the influence of the released tension and pulled back to the drawing roller 1 side, and the other yarn end is drawn. Is pulled to the guide roller 2 side.

  Thus, the yarn Y <b> 3 drawn toward the drawing roller 1 next contacts the drawing roller 1. Then, it is presumed that the yarn Y3 in contact with the drawing roller 1 is wound around the drawing roller 1 rotating in the direction of the arrow shown and wound around the drawing roller 1 to form a so-called “roller wound yarn”.

  Thus, as a result of analyzing the behavior of the running yarn Y at the time of yarn breakage, the present inventors can capture the yarn end of the yarn Y3 attracted to the drawing roller 1 side by the yarn suction means. The present invention has been completed with the idea that it is possible to prevent winding of the yarn around the drawing roller 1. Hereinafter, the invention completed by the present inventors will be described in detail with reference to FIG. 3 and FIG.

  FIG. 3 is a side view schematically showing an embodiment in which a yarn suction means is provided in the step of drawing the multi-thread shown in FIG. 1, and FIG. 4 is an embodiment of the yarn suction means. FIG. 3 and 4, reference numeral 3 denotes a yarn suction unit, and the yarn suction unit 3 has a suction head 32 provided with a slit-like suction opening 31. At this time, the slit-shaped suction opening 31 is provided at a position facing the stretching roller 1 so as to be parallel to the stretching roller 1 as illustrated.

  An exhaust pipe 33 is connected to the suction head 32, and external air can be sucked from the slit-like suction opening 31 by exhausting the internal air from the suction head 32 through the exhaust pipe 33. Has been. At this time, the exhaust pipe 33 may be made of a rigid metal material, but may be a flexible pipe such as a resin hose or a bellows hose reinforced with a metal wire or the like.

  The suction head 32 is preferably a cylindrical hollow body, and examples of such a cylindrical hollow body include a hollow cylinder, a hollow triangular column, a hollow quadrangular column, and a hollow pentagonal column. it can. Further, it is preferable that the suction head 32 is not fixedly installed, but can be moved to a position (for example, an upper position) that does not adversely affect the traveling yarn group Y being stretched. This is because a movable thread suction tool (for example, a portable suction gun) is used for re-threading the thread of the broken weight onto a winder (not shown) provided on the most downstream side. This is because it is preferable to move the suction head 32 once from the vicinity of the drawing roller 1 to a position where the yarn transfer operation becomes easy in order to improve the workability when transferring the yarn.

  At this time, the suction opening 31 is provided in the shape of a straight slit along the length direction of the stretching roller 1 as described above, and its length (L) travels in parallel on the stretching roller 1. In order to cover the traveling area of the multi-yarn yarn Y, it is longer than the traveling width of all the spindle yarns. This is because, as shown in FIG. 2, when the yarn end of the broken yarn Y3 is drawn near the drawing roller 1, the drawn yarn end is sucked into the suction opening. This is because any part of 31 is necessarily approached. Then, the yarn end approaching the suction opening 31 can be sucked and captured in the suction head 32 from the suction opening 31 together with the suction air.

  Note that it is preferable to increase the “opening width” formed in the slit shape of the suction opening 31 because the yarn end generated by the yarn breakage can be satisfactorily captured by suction. However, if the opening width is too large, the air in the suction head 32 is exhausted in order to maintain the “wind speed and air volume of the air taken in from the suction opening 31” which is necessary to satisfactorily supplement the yarn end with suction. It is not preferable because the exhaust capacity of the exhaust fan (blower) or vacuum generator must be increased, and an exhaust means having higher performance than necessary is required. Therefore, the “opening width” of the suction opening 31 is preferably 0.5 to 10 mm.

  Next, the gap (d) formed between the drawing roller 1 and the suction opening 31 is not particularly limited as long as the yarn end can be satisfactorily captured so that the winding of the roller does not occur. Usually, it is preferably 1 to 30 mm. This is because, depending on conditions such as yarn running speed, yarn tension, the number of filaments constituting the yarn and the single fiber fineness, if the gap (d) is too long, the present inventors This is because it has been found from experiments that the yarn ends cannot be captured well. In addition, when too short as less than 1 mm, the danger that the extending | stretching roller 1 and the suction head 32 will contact becomes high, and is unpreferable.

  In the present invention, the speed of the yarn traveling on the drawing roller 1 is preferably 100 to 2000 m / min. This is because it is difficult to quickly catch the yarn end even if a yarn breakage occurs on a yarn traveling at a higher speed than this range. In addition, when the running speed of the yarn is too slow, less than 100 m / min, the production loss per unit time is further reduced, and the effect of the present invention is reduced.

  As described above, in the present invention, the suction head provided with the slit-like suction opening 31 in the vicinity of the yarn output side of the drawing roller 1 using the behavior of the yarn Y3 shown in FIG. 32 is installed. And by adopting such an apparatus configuration, it is possible to satisfactorily capture the yarn end of the yarn Y3 that has been broken to be wound around the drawing roller 1. Then, the trapped yarn Y3 is continuously sucked and kept in this state until the fully drawn yarn package is wound with all the weights other than the broken weight.

Then, after winding the drawn yarn package that has been fully wound, when switching winding from the full bobbin to the empty bobbin for winding to a new empty bobbin, the threaded weight that has been waiting is put into the drawing device. Re-thread and take up. In other words, after the traveling yarn being sucked is transferred to a movable yarn suction tool (for example, a portable suction gun), only the corresponding weight that has been broken is provided on the most downstream side without stopping the drawing device. Re-threading is possible up to the take-up machine.
If it does so, all the drawn yarn groups of all the spindles which will start winding from this time will start winding on the same conditions. Moreover, even if the spinning process is directly connected to the stretching process as in the direct spinning process, it is not necessary to retroactively handle the occurrence of yarn breakage in the stretching process.

  As described above, in the present invention, even if yarn breakage occurs in the drawing process, the yarn breaking process can be processed in the drawing process, and the drawing process can be continued without interruption. In addition, in the present invention, the yarn breaking process can be completed only by performing the yarn breaking process in the drawing process of only the broken weight. For this reason, as in the conventional case, when the yarn breakage occurs, the yarn winding around the drawing roller occurs, so the drawing process is interrupted and the drawing device is stopped, or in the extreme case, the spinning machine is also stopped, There is no need to perform a yarn breaking process for all the spindles by removing the yarn wound around the drawing roller. Therefore, both the amount of small-sized drawn yarn packages and the amount of waste yarns are extremely reduced, and the production loss is greatly reduced. Furthermore, the burden on the worker and the processing time required for the yarn breaking process are greatly reduced.

  In addition, as one embodiment of the yarn suction means 3 according to the present invention, following the exhaust pipe 33, the illustration is omitted in FIGS. 3 and 4, but further, a waste yarn collection box, a waste yarn-air separation means. Further, it is possible to adopt a configuration in which the exhaust means is provided at least in this order. In this case, if the air in the system that is kept airtight to a necessary extent is exhausted from an exhaust means (not shown) such as a blower or a vacuum suction device, the air is finally passed through the exhaust pipe 33. The air from outside the system can be sucked from the suction opening 31 provided in the suction head 32 with the yarn end to be trapped.

  In addition, as another embodiment of the yarn suction means 3 used in the present invention, an ejector or the like can be used without using an exhaust means including a blower or a vacuum suction device. In this case, a nozzle for ejecting a high-speed air flow in the suction direction of the yarn is provided in the exhaust pipe 33 near the suction head 32 constituting the yarn suction means 3, and the high-speed air current is ejected from this nozzle. And it can also be set as the apparatus structure which sucks and exhausts the air in the suction head 32 in connection with the jetted air current, and sucks air from the suction opening 31 together with this.

  In addition, as the waste thread-air separation means provided between the waste thread collection box and the exhaust means, an air filter generally used in a vacuum cleaner or the like can be preferably used. A wire mesh with a small mesh size can be used.

FIG. 2 is a schematic explanatory diagram showing a state in which a multi-threaded yarn group of two or more spindles runs simultaneously on the stretching roller 1 in parallel. It is explanatory drawing for demonstrating the yarn breaking behavior clarified by the moving image analysis which the present inventors performed. It is the side view which showed typically the example of an embodiment which provided the thread | yarn suction means in the extending | stretching process of the multiple spindle shown in FIG. It is the perspective view which illustrated one embodiment of the strip suction means concerning the present invention.

Explanation of symbols

1: Stretching roller 2: Guide roller 3: Yarn suction means 31: Slit suction opening 32: Suction head 33: Exhaust piping d: Gap length L: Length of slit suction opening Y: Traveling yarn

Claims (6)

In a multi-bore stretcher that simultaneously stretches a plurality of unstretched yarn groups made of thermoplastic synthetic fibers between a pair of stretcher rollers having a speed difference and stretches them simultaneously with respect to the position at which yarn breakage occurs during the stretching process. From the running width of the slit-like full-fed yarn on the yarn outlet side of the drawing roller located on the immediately upstream side, for sucking and capturing the yarn end caused by the occurrence of yarn breakage facing and close to the drawing roller A multi-filament drawing device yarn breakage treatment device characterized by providing a long suction opening.   The yarn breakage treatment apparatus for a multi-bore drawing apparatus according to claim 1, wherein the suction opening is provided in a suction head made of a cylindrical hollow body provided in parallel to face the drawing roller.   A thread breakage treatment method for a multi-bore stretching apparatus, wherein the thread breakage treatment apparatus according to claim 1 or 2 is used to perform the thread breakage treatment that occurs in the stretching step.   The yarn breakage treatment method for a multi-bore drawing apparatus according to claim 3, comprising a spinning step directly connected to the drawing step as a pre-step of the drawing step.   The yarn end produced by the yarn breakage generated during the drawing process is continuously sucked by the suction head, and the yarn is re-threaded into the multi-bore drawing device when the full winding of the drawn yarn that has been drawn is completed. The yarn-breaking processing method of the multiple spindle | stretch extending | stretching apparatus of Claim 4.   6. The yarn breaking treatment method for a multi-cylinder drawing apparatus according to claim 3, wherein a gap between the drawing roller and a suction opening facing and close to the drawing roller is 1 to 30 mm.

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