JP2008202157A - Broken yarn treating apparatus and broken yarn treating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broken yarn treating apparatus for melt-spinning, which is capable of treating a broken yarn in a short time and quickly restarting a spinning apparatus when breaking a yarn passing through a cooling wind blowing apparatus having a cylindrical form in melt-spinning a thermoplastic polymer. <P>SOLUTION: The broken yarn treating apparatus for melt-spinning is provided with at least a spinneret 1 to form a multifilament yarn, a yarn cooling device 3 placed below the spinneret, a spinning cylinder 4 added under the yarn cooling device, an oil applicator 6 placed in the spinning cylinder, a yarn breakage detector 10 to detect the breakage of the filament yarn and a driving device 11 to lift or lower the yarn cooling device 3. When the breakage of a filament yarn is detected by the yarn breakage detector 10 during a melt-spinning process, the yarn cooling device 3 is lowered by the driving device 11 according to the yarn breakage detection signal transmitted from the yarn breakage detector 10 to form a space to discharge the broken spun yarn between the spinneret 1 and the yarn cooling device 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for treating a broken yarn generated when a thermoplastic synthetic fiber is melt-spun.

  A method of cooling the spun polymer after melt-discharging the thermoplastic polymer from the spinneret is a general process for producing synthetic fibers. The synthetic fiber cooling process plays an important role in obtaining high-quality yarns, and especially in the melt spinning process of garment long fibers, it has a great influence on the yarn strength, elongation and dyeing properties after spinning. Is conventionally known.

  In particular, in recent years, a plurality of thin multifilament yarns have been spun from a single die, and it has become possible to produce fibers having a single yarn fineness of 0.3 dtex or less. In this way, in the process of spinning a plurality of thin multifilament yarns from a single die, it is very important to control the fineness of the yarn, and to stably produce homogeneous yarns. Technology is needed.

  In the prior art, as disclosed in Patent Document 1 and Patent Document 2, a cooling device for supplying cooling air across the traveling yarn in one direction from the lateral direction to the traveling direction of the yarn is provided. Arrangement is performed below the base. Then, the cooling air blowing length of a certain length is set along the yarn traveling direction, and the cooling air having a uniform and constant air velocity is supplied, or the accompanying airflow that develops around the traveling yarn is suppressed and controlled. Or rectifying and controlling the turbulence of the cooling air blown from the cooling device.

  However, this conventional side-blow cooling method has a limit in reducing the difference between the weights of the fiber group. For this reason, in recent years, for example, as disclosed in Patent Document 3 and Patent Document 4, by passing the yarn group through an independent cylindrical cooling air blowing device, the yarn and the cooling air blowing surface Development of a device that realizes uniform yarn cooling that suppresses cooling spots by supplying cooling air from a short distance radially to the spun yarn while keeping the distance between them small. ing.

  By the way, when a yarn breakage occurs in melt spinning using this cylindrical yarn cooling device, the spinning tube provided integrally with this yarn cooling device is manually lowered and a cooling air blowout incorporated in the cooling device. It is necessary to rapidly thread the number of yarns into the inside of the device. However, when the threading treatment is delayed, the yarn accumulates inside the cooling air blowing device in the yarn cooling device, and the yarn that accumulates one after another finally reaches the base surface. Then, the yarn contacts with the heated polymer discharge surface, causing a problem that the spinning is difficult to continue. Therefore, unless the polymer discharge surface of the die is cleaned, a situation in which melt spinning cannot be resumed is caused.

  In addition, when the yarn breakage occurs and the treatment is delayed, there is a problem that the molten polymer is fused to the cooling air blowing surface to cause clogging. In this way, when the yarn is fused to the cooling air blowing surface, it is necessary to replace the rectifying body provided on the cooling air blowing surface, and the time spent for the restoration work becomes enormous, which reduces productivity and reduces production costs. Leads to an increase.

Japanese Patent Application Laid-Open No. 07-97709 JP 2000-34615 A JP 2004-300614 A JP 2003-253522 A

  In view of the problems of the prior art described above, the object of the present invention is to provide a case where a yarn passing through a cooling air blowing device formed in a cylindrical shape breaks when melt spinning a thermoplastic polymer. , The spinning equipment can be restarted quickly after the yarn is cut in a short time. For example, even if the yarn cutting process fails, equipment protection and quick re-threading work should be performed efficiently. An object of the present invention is to provide a melt-spinning device for melt spinning that can improve productivity and reduce production costs.

  The present inventors have conceived the present invention as a result of intensive studies to solve the above problems. That is, as the present invention, “a spinneret for discharging a molten thermoplastic polymer to obtain a multifilament yarn, a yarn cooling device provided below the spinneret and having a cylindrical cooling air blowing surface, A spinning cylinder attached below the yarn cooling device, an oil agent applying device provided in the spinning tube, a yarn breakage detector for detecting the breakage of the multifilament yarn, and the yarn cooling device being moved up and down A free drive device, and when the breakage detector detects the breakage of the multifilament yarn during melt spinning, the drive device responds to a breakage detection signal from the breakage detector. A yarn cooling device for melt spinning, wherein the yarn cooling device is lowered to form a discharge space for discharging the spun spun yarn between the spinneret and the yarn cooling device. Proposed It is.

  At this time, the yarn breakage processing device of the present invention rotates to a protruding position that covers the oil agent application device when yarn breakage occurs, and waits on the wall surface of the spinning cylinder during normal melt spinning. A movable inclined plate is provided in the spinning cylinder, the inclined plate is projected in conjunction with a yarn break detection signal detected by the yarn breakage detector, and the oil agent applying device is used to feed the broken yarn from above the inclined plate. It is preferable that the apparatus is characterized in that it slides down without being entangled.

  In the synthetic fiber melt spinning apparatus using the conventional cylindrical cooling device, as described above, when the yarn breaks, the yarn that has been broken is entangled with the oil application device. Further, there is a problem that when the yarn is broken, if the rapid yarn breaking process fails or the yarn breaking treatment is delayed, the yarn is fused to the base surface. Furthermore, when the yarn stays in the yarn cooling device having a cylindrical cooling air blowing surface and is fused, it is also necessary to replace the part of the attached lower portion. If the melted yarn (molten polymer) adheres to the base, it is necessary to clean the base, and if spinning is not stable due to the cleaning of the base, even if the base of the base pack is not replaced, it may even happen. Become.

  However, when the yarn breakage is detected by using the “melt spinning yarn breakage treatment device” of the present invention, the yarn cooling device can be automatically lowered in conjunction with this. If it does so, the discharge space of the thread | yarn for discharging | emitting the thread | yarn cut between the nozzle | cap | die surface and the thread | yarn cooling device can be formed.

  For this reason, even if the yarn breaking process fails or the yarn breaking process is delayed, the broken yarn does not stay inside the yarn cooling device, and only the yarn weight is formed in a cylindrical shape. It is only necessary to pass the thread through the cooling air blowing surface. As a result, the yarn-breaking process can be performed quickly, so that waste yarn loss that occurs before melt spinning is restarted and the work time required for re-threading can be shortened, improving productivity. There is a remarkable effect that it contributes greatly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 are explanatory views schematically showing an embodiment example in the case where the yarn breakage treatment apparatus according to the present invention is provided in a melt spinning facility. FIG. 1 is an explanatory diagram in a case where normal operation is continued without occurrence of yarn breakage in the melt spinning process, and FIG. It is explanatory drawing in the case of.

  1 and 2, reference numeral Y is a yarn, reference numeral 1 is a spinneret 1, reference numeral 2 is a seal structure, reference numeral 3a is a main body of a yarn cooling device, and reference numeral 3b is a cylindrical shape. Cooling air outlet surface (usually provided with a rectifying body for rectifying the cooling air), reference numeral 4 is a spinning cylinder, reference numeral 5a is an inclined plate, reference numeral 5b is a rotation device for the inclined plate 5a, Reference numeral 6 is an oil application device, reference numeral 7 is a yarn suction device, reference numeral 8 is a first take-off roller, reference numeral 9 is a second take-up roller, reference numeral 10 is a yarn breakage detector, and reference numeral 11 is Drive devices that can move up and down the yarn cooling device main body 3a are shown.

  The spinning cylinder 4 is provided below the yarn cooling device main body 3a as shown in the figure. At this time, in melt spinning of ultrafine fibers, since the thinning of the yarn and the cooling and solidification are performed at an early time after being discharged from the die 1, the oil agent application device 6 spins filaments of normal fineness. It will be positioned higher than Therefore, in the case of spinning an ultrafine yarn having a single fiber fineness of 0.3 or less in the range of Stex, the oil agent applying device 6 is positioned inside the spinning tube 4 as illustrated.

The seal structure 2 is provided in the slow cooling zone of the spun yarn Y between the base 1 and the yarn cooling device main body 3a. The role is to prevent the cooling air blown from the cooling air blowing surface 3b below from entering the slow cooling zone and cooling the polymer discharge surface of the base 1.
This is because when air is discharged to the outside from this slow cooling zone, the cooling air from the cooling air blowing surface 3b is blown up to the slow cooling zone due to the chimney effect.

  That is, the seal structure 2 plays a role of preventing the cooling air from blowing up to such a slow cooling zone. In the present invention, as illustrated in FIG. 2, the seal structure 2 is fixed to the yarn cooling device 3a, and when the yarn cooling device 3a moves up and down, the seal structure 2 itself also moves up and down. Has been.

  In the melt spinning equipment provided with the yarn breaker configured as described above, the plurality of yarns Y spun from the base 1 are supplied from a cylindrical cooling air blowing surface 3b attached to the yarn cooling device main body 3a. After cooling to a predetermined temperature (or glass transition temperature in the case of polyester) with cooling air blown radially, and applying the oil agent with the oil agent applying device 6 located below the cooling device 2, illustration is omitted as necessary. After the filaments are finely entangled by the yarn interlacing device (interlacing device), the filaments are taken up by the first take-up roller 8 and the second take-up roller 9 at a predetermined spinning speed, and finally a winder (not shown) To wind up as a bobbin.

  At that time, when the yarn breakage occurs while continuing the melt spinning, as shown in FIG. 2, the yarn breakage is detected by the yarn breakage detector 10 provided on the most downstream side toward the side where the yarn Y travels, A yarn breakage detection signal is transmitted to a control device (not shown). Then, this control device (not shown) immediately activates the yarn suction device 7 and the inclined plate 5a, sucks the yarn Y that has been broken, and rotates the inclined plate 5a to move the yarn running path. The inclined plate 5a is protruded on the yarn path in a state where it is crossed and inclined vertically downward. At the same time, the driving device 11 provided on the back surface of the yarn cooling device main body 3a is operated to lower the yarn cooling device main body 3a.

  If the thread suction device 7 has succeeded in sucking the broken yarn by the series of operations as described above, the thread Y of the sucked weight is transferred from the yarn suction device 7 to the portable thread. Deliver it to the suction gun 12, which is a hanging tool. Then, the operator winds the yarn Y sucked by the suction gun 12 around the first take-up roller 8 and the second take-up roller 9 to complete the yarn hooking, and finally the winder (not shown). The yarn is transferred to the yarn Y and the operation of the melt spinning equipment is continued.

  As described above, the yarn breaking process may be performed smoothly. However, when the yarn breaking process fails, the conventional apparatus has a problem as described in the “Background Art” section. However, in the present invention, the yarn cooling device main body 3 a is lowered by the drive device 11 at the same time that the yarn breakage detector 10 detects the yarn breakage. For this reason, for example, even if the yarn breaking process fails, the spun yarn that has been broken is discharged between the seal structure 2 and the base 1 provided immediately above the cylindrical cooling air blowing surface 3b. Since the discharge space is formed, the yarn Y that has been broken into the discharge space is naturally discharged.

  In this natural discharge state, even when the arrival of the operator at the spindle of the spindle was delayed, or the operator was working on the spindle of another spindle. However, the yarn Y is discharged out of the system without staying inside the cylindrical cooling air blowing surface 3b in the yarn cooling device main body 3a. Therefore, it is possible to prevent the polymer from fusing to the polymer discharge surface of the base 1 or the inner surface of the cylindrical cooling air blowing surface 3b of the yarn cooling device main body 3a.

  On the other hand, if the melted yarn Y is fused to the cooling air blowing surface 3b inside the yarn cooling device main body 3a, naturally, the cooling air cannot be properly rectified. . Then, in order to restore the rectifying effect, it is necessary to replace the cylindrical cooling air blowing surface 3b. However, in order to perform this replacement work, the seal structure 2 provided at the upper part of the yarn cooling device main body 3a is removed, and the cooling air blowing surface 3b is removed from the upper part and replaced with a new cooling air blowing surface 3b. Work is required. Therefore, this replacement work requires a certain amount of time.

  In addition, after completing the replacement, in order to confirm the rectification effect, it is necessary to check the air velocity distribution of the cooling air blown from the cooling air blowing surface 3b. It will decrease. Furthermore, when the yarn Y stays inside the cooling air blowing surface 3b and accumulates and grows one after another and reaches the base 1, it contacts the heated base 1 to cause fusion, and polymer discharge Dirty face.

  If such a situation occurs, an operation for cleaning the polymer discharge surface of the base 1 is necessary, and in some cases, it is necessary to replace the base 1 itself. However, when replacing the base 1, it is necessary to replace the spinneret pack on which the base 1 is mounted together. For this reason, the extra work of pack replacement work is required, and a longer work time is required. Furthermore, since it is necessary to discharge all the yarn Y until the temperature of the spinning machine after the pack replacement operation becomes stable, it becomes yarn waste, which causes not only a reduction in production efficiency but also a product loss, resulting in an increase in cost. Connected.

  Therefore, in order to avoid this problem, it is necessary to lower the yarn cooling device main body 3a by the driving device 11 provided on the back surface of the yarn cooling device main body 3a. Then, since a discharge space is formed between the yarn cooling device main body 3a and the base 1, threading from the discharge space in which the yarn Y discharged from the base 1 is formed into the cooling air blowing surface 3b is performed. Can pass smoothly.

  Accordingly, the yarn that has been cut off can be received by the suction gun 12 at the lower part of the spinning cylinder 4 and threaded onto the first take-up roller 8 and the second take-up roller 9 can be carried out. Regarding this work, the work different from the work when the yarn breakage processing is successful is only the work of passing the naturally discharged yarn Y through the cylindrical cooling air blowing surface 3b of the yarn cooling device body 3a. In terms of time, the work is almost the same as the case where the above-described thread breaking process is successful.

  As a result, when the yarn breakage occurs, even if the yarn suction by the yarn suction device 7 fails, the subsequent yarn breakage processing can be performed smoothly by the yarn breakage processing described above. It becomes possible. As a result, the cost required for production can be reduced, and at the same time, the re-threading operation time can be shortened and the productivity can be improved by increasing the efficiency.

  Finally, the role played by the inclined plate 5a in the case where the yarn breaking process has failed will be described in detail below with reference to the explanatory view of FIG. However, in FIG. 3, the description of the driving device 11 illustrated in FIGS. 1 and 2 is omitted because it overlaps with the rotating device 5b in order to avoid confusion with the description. In addition, the rotation device 5b of the inclined plate 5a is illustrated.

  When the yarn breakage occurs as described above and the yarn breakage detector 10 detects the yarn breakage, a yarn breakage detection signal is transmitted to the yarn suction device 7 and the control device (not shown) of the inclined plate 5a. The When this yarn breakage detection signal is received by the control device (not shown), as illustrated in FIG. 3, an air flow control device (not shown) such as an electromagnetic valve is sent from the control device (not shown). The yarn suction device 7 is actuated by operating Then, the yarn Y is brought into a suckable state, and the broken yarn Y is sucked. At the same time, the rotation device 5a is operated to rotate the inclined plate 5a provided in the spinning cylinder 4 in the direction of the yarn path (from the position of FIG. 1 to the position of FIGS. 2 and 3). It protrudes in a state where it is tilted vertically downward across.

  The inclined plate 5a is provided between the lower end of the yarn cooling device main body 3a and the upper end of the oil application device 6, and covers the oil agent application device 6 while being inclined vertically downward. It can rotate freely. Further, as illustrated in FIG. 3, the inclined plate 5 a is formed of a plate-like member that is inclined downward with the wall surface of the spinning tube 4 as a rotation center.

  Therefore, the broken yarn Y can slide down along the inclined surface of the inclined plate 5a without staying above the inclined plate 5a. In addition, the inclination angle to the vertically lower direction formed by the inclined plate 5a is set to an angle at which the yarn Y can smoothly slide down. Further, at least the upper surface is preferably formed of a material having a small friction coefficient such as a fluororesin (tetrafluoroethylene resin or the like).

  On the other hand, if the inclined plate 5a is not provided, the yarn Y is caught on the oil agent applicator 6 protruding on the yarn path, causing a problem that the yarn Y is accumulated above it. Therefore, in the conventional technique, when the yarn breakage occurs, the yarn Y has to be retreated to a position where it does not catch on the oil agent applicator 6. For this reason, a complicated device for retreating the oil agent applying device 6 itself from the normal installation position in the spinning cylinder and preventing the broken yarn from being entangled is required.

  However, in the present invention, as described above, the oil application device 6 does not need to be retreated, and is kept as it is, and is a simple device that rotates only the inclined plate 5a. Thus, the yarn breaking process can be performed smoothly. Therefore, a complicated device for moving the oil agent applying device 6 forward or backward is not necessary.

  As described above in detail, according to the device according to the present invention, the yarn Y that is in contact with the oil agent applying device 6 is moved by rotating the inclined plate 5a immediately after the yarn breakage occurs. , It can be forcibly released from the engaged state. In other words, the yarn path can be moved in a direction in which the thread Y engaged from the oil application device 6 is disengaged. Therefore, the yarn Y spun one after another from the base 1 travels as it is without being caught by the oil application device 6, or slides down on the inclined plate 5a.

  At this time, the yarn suction device 7 provided below the spinning cylinder 4 is already in a state in which the yarn Y can be sucked as described above. It is captured and sucked by the suction device 7. In this way, when the yarn breakage occurs, the yarn Y spun one after another from the base 1 is applied to the yarn suction device 7 in a state where the engagement with the oil applying device 6 is released by the inclined plate 5a. Sucked. Therefore, the yarn Y is not accumulated in the upper part of the spinning cylinder 4, and the yarn Y that has been smoothly cut out of the spinning cylinder 4 is discharged. Therefore, as a matter of course, the broken yarn Y is not entangled with the oil applying device 6.

It is a schematic diagram which shows an example of the cylindrical cooling device of the synthetic fiber of this invention. It is a schematic diagram which shows the cylindrical yarn cooling device fall state at the time of the yarn breakage generation | occurrence | production of the cylindrical cooling device of the synthetic fiber of this invention. It is explanatory drawing about the role which the inclination board which concerns on this invention plays.

Explanation of symbols

1: Base 2: Seal structure 3a: Yarn cooling device main body 3b: Cooling air blowing surface 4: Spinning cylinder 5a: Inclined plate 5b: Rotating device 6: Oil supply device 7: Yarn suction device 8: First take-up roller 9: Second take-up roller 10: Thread breakage detector 11: Drive device 12: Suction gun Y: Yarn

Claims (2)

A spinneret for discharging a molten thermoplastic polymer to obtain a multifilament yarn, a yarn cooling device provided below the spinneret and having a cylindrical cooling air blowing surface, and below the yarn cooling device An attached spinning cylinder, an oil agent applying device provided in the spinning cylinder, a yarn breakage detector for detecting the breakage of the multifilament yarn, and a drive device for moving the yarn cooling device up and down. At least,
When the breakage detector detects the breakage of the multifilament yarn during melt spinning, the driving device lowers the strip cooling device according to the breakage detection signal from the breakage detector, and the spinneret And a yarn cooling device for forming a spinning yarn for melt spinning, wherein a discharge space for discharging the spun yarn is formed.   When the yarn breakage occurs, the spinning cylinder is provided with a rotatable inclined plate that rotates to a protruding position that covers the upper part of the oil supply device, and waits on the wall surface of the spinning cylinder during normal melt spinning. The melting is characterized in that the inclined plate is projected in conjunction with the yarn break detection signal detected by the yarn detector, and the broken yarn is slid down from the inclined plate without being entangled with the oil application device. A yarn breaker for spinning.

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