JP4802501B2 - Melt spinning equipment - Google Patents

Description

  The present invention relates to a melt spinning apparatus, and in particular, appropriately treats a yarn that is subsequently spun when melt breakage occurs in a melt-spun yarn while ensuring uniformity in the thickness of each yarn. The present invention relates to a melt spinning apparatus that can be used.

  As a spinning device for synthetic fiber yarn, a melt spinning device having a spinneret for spinning a yarn and a cooling device for cooling and solidifying the spun yarn provided on the downstream side of the spinneret is well known. It has been. On the downstream side of the cooling device, a take-up roller composed of a godet roller, a drawing roller or the like is provided.

  In such a conventional synthetic fiber yarn spinning device, when one of the yarns is cut during operation and touches a rotating body such as a godet roller, a drawing roller or another roller, the yarn becomes a waste yarn surface of those rollers. Wound around a large amount. In particular, when the yarn-making speed is high or the number of yarns is increased, the amount of wrapping of the roller increases with the passage of time within a short period of time, and the waste yarn is swung out of the godet roller and is not broken. Other yarns may be cut or broken yarn may enter other products and become defective, and there is a disadvantage that the machine may hit each part of the apparatus and cause damage to the machine. In addition, it takes a considerable amount of time and labor to remove the waste yarn wound around the roller, and the machine must be stopped during that time. As a result, the productivity is remarkably reduced.

As a yarn trimming device, for example, as described in Patent Document 1, a device that sucks with an aspirator when the yarn is solidified, or tilts the bottom surface of the spinning cylinder so that scrap yarn can be taken out is proposed. Has been. However, in such a thread trimming processing apparatus, it is impossible to process immediately even if the number of workers is reduced due to labor saving, and in the present situation, the bulk density of polyester is about Since the amount is as small as 0.04 g / cm ² , the amount of waste yarn becomes enormous, and the spinning cylinder becomes full, and the processing becomes a difficult task. In addition, the aspirator cannot be completely sucked, resulting in the reverse spraying and scattering of the waste yarn, which again has the disadvantage that the processing becomes a serious work.

For example, Patent Document 2 proposes an apparatus that cuts a yarn when the yarn downstream from the cooling device is solidified. However, even in such a thread trimming processing apparatus, in the current situation where the number of workers is reduced due to labor saving and the thread cannot be processed immediately even when the yarn is cut, the bulk density of the solidified yarn is about 0.04 g / cm. ^Since it is as small as ² , the amount of waste yarn becomes enormous, and the processing becomes a big task. If there is an oiling device in the vicinity, there is a risk of developing troubles involving it. Then, the work of processing the wound yarn will increase.

  In order to prevent the troubles described above, the time interval for the operator's patrol must be shortened, which increases the number of workers and increases the manufacturing cost.

  On the other hand, in a spinning device that performs melt spinning of thermoplastic polymers such as polyester, polyamide, polyolefin, and polyvinyl, a cooling airflow region such as air or an inert gas is formed below the spinneret (on the downstream side). The polymer discharged from the spinneret is cooled and solidified to form a yarn. However, in such an apparatus, uniform solidification cannot be achieved unless the cooling airflow is allowed to act evenly on the spun yarn, and a uniform yarn having no thickness unevenness cannot be obtained.

Therefore, it is desirable to bring the yarn and the cooling device closer to eliminate the uneven thickness of the yarn and to spray the yarn before disturbing the more uniform cold air. However, if the distance is too close, there is a possibility that the thread hits the cooling device and the frequency of yarn breakage increases.
JP 52-74009 A (paragraph [0004]) Japanese Patent Laid-Open No. 51-105412 (paragraph [0005])

  Accordingly, an object of the present invention is to prevent the occurrence of large yarn thickness unevenness on the spun yarn, and when the spun yarn without the yarn thickness unevenness is cut, the yarn that is subsequently spun is each roller. An object of the present invention is to provide a melt spinning apparatus that can be easily processed on the upstream side without being wound in a large amount, and can be left for a long time.

In order to solve the above problems, a melt spinning apparatus according to the present invention includes a spinneret for spinning a yarn, and a cooling device for cooling and solidifying the spun yarn provided downstream of the spinneret. The distance between the outermost peripheral yarn of the yarn spun from the spinneret and the surface of the cooling device is set to 25 mm or less than the position where the yarn is solidified by the cooling device. Upstream of the yarn spun from the spinneret, there is an initial thread trimming plate that cuts the yarn on the cooling device side, and an inclination that allows all the yarns to fall naturally in a lump after cutting the remaining yarn. A thread trimming device provided with an inclined plate is provided on a side plate of the cooling device .

That is, first, the yarn and the cooling device are brought close to each other in order to eliminate the uneven thickness of the yarn, and as a result of investigating blowing the yarn before disturbing the more uniform cold air, the distance between them is within 25 mm, preferably 20 mm. It turned out to be within. However, it was also found that about 10 mm is desirable because the yarn hits the cooling device and breaks if it is too close. In this way, a thread trimming apparatus that can appropriately process at the time of thread breakage is provided while setting the distance between the outermost peripheral yarn and the surface of the cooling device within 25 mm. When the yarn breakage occurs, this yarn trimming device first cuts the initial yarn trimming plate that cuts the yarn on the cooling device side from the yarn initially spun from the spinneret, and then the remaining yarn. It is configured in a two-stage thread trimming apparatus including an inclined plate that has an inclination that allows the entire yarn to fall naturally in a lump state, so that the entire yarn can be reliably discharged. By installing this yarn trimming apparatus upstream of the position where the yarn is solidified by the cooling device, all the yarns are in a solid state, that is, in a high density state (for example, the density of polyester is 1. 18g / cm ³ ), it can be allowed to fall naturally through an inclined plate, making it possible to carry out efficient yarn breakage processing while keeping the amount of waste yarn generated small, and leaving it in that state for a long time. However, it is intended not to cause any problems.

In such a melt spinning apparatus, as the thread cutting apparatus, it can be assumed to be operated based on the detection signal from the yarn breakage detectors provided in the running yarn path of the take-off roller after.

  In the thread trimming apparatus, it is preferable that the initial thread trimming plate is operated in conjunction with the operation of the inclined plate and is operated prior to the operation of the inclined plate.

  Moreover, this thread trimming apparatus can be configured to have an actuator for operating it. The actuator may be an actuator that operates the inclined plate, and the initial thread trimming plate may be operated prior to the operation of the inclined plate in conjunction with the operation of the inclined plate. As an actuator, in addition to the one that actively drives the inclined plate, for example, the inclined plate and the initial thread trimming plate are held at the standby position by a magnet, and a force larger than the attracting force by the magnet is applied at the time of thread breakage processing. A method of starting a predetermined operation by releasing the magnetic force of the magnet can also be adopted.

  According to the melt spinning apparatus of the present invention, since the cooling device is close to the yarn, there is no unevenness in the thickness of the yarn, and when the yarn is cut during operation, the entire yarn is surely cut for yarn breakage processing. In addition, the waste yarn can be efficiently processed in a high density state, so that it is possible to avoid a situation in which a large amount of waste yarn is wound around a rotating body such as a godet roller, a drawing roller or another roller, and long after the yarn breaks. It is possible to leave it for hours. Therefore, even in the labor-saving melt spinning process, while maintaining the low-cost state, efficient yarn breakage processing can be performed without causing problems with the production of high-quality yarns without thickness unevenness. It becomes possible.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings together with preferred embodiments thereof.
In the melt spinning apparatus of the present invention, it is important that the cooling device is close to the yarn. By setting the distance between the outermost peripheral yarn of the yarn spun from the spinneret and the surface of the cooling device within 25 mm, it becomes possible to spray the yarn before disturbing more uniform cold air. It will be possible to produce high-quality yarns without thickness spots. Also, upstream of the position where the yarn solidifies in the cooling device, an initial thread trimming plate that cuts the yarn close to the surface of the cooling device, and after cutting the remaining yarn, all the yarns are solidified ( It is important to provide a thread trimming apparatus provided with an inclined plate having an inclination that allows natural density to drop at 1.18 g / cm ³ ). This yarn trimming processing device is operated based on a detection signal from a yarn breakage detector provided in the traveling yarn path after the take-up roller, for example.

  In completing the present invention, first, preliminary tests as shown in FIGS. That is, as shown in FIGS. 10 and 11, when the yarn breakage occurs, the yarn 2 spun from the spinneret 1 is provided in the cooling device 3 and can be tilted about the rotation shaft 13. We considered a method of tilting the plate 12 and cutting the entire yarn on the upstream side from the position where the yarn is solidified, and discharging it in the state of the lump 10. Since it is what is going to cut | disconnect, the problem that several pieces by the side of the cooling device 3 could not cut | run out occurred. Moreover, since the surface of the cooling device 3 is made of a weak wire mesh, the wire mesh may be broken by the inclined plate 12 larger than the inclined plate according to the present invention described later. In addition, during normal spinning, the inclined plate 12 blocks the front surface of the cooling device 3, and there are disadvantages such as invisible yarn and uneven yarn thickness. Thus, as a result of intensive studies, the initial thread trimming plate according to the present invention was devised, and the thread breakage treatment was performed in combination with a predetermined inclined plate. As a result, extremely good results were obtained.

Hereinafter, preferred embodiments of the melt spinning apparatus of the present invention will be described with reference to the drawings.
In FIG. 1, the distance L between the outermost peripheral yarn 2 (in FIG. 1, the position of the outermost peripheral yarn) of the yarns spun from the spinneret 1 and the frame 3 a of the cooling device 3 is set. Within 20 mm. The thickness of the frame at this time is 5 mm. That is, the distance from the metal mesh 4 as the surface of the cooling device 3 is set within 25 mm. The distance from the wire mesh 4 is important for the influence on the thickness unevenness of the yarn, and the thickness of the frame 3a is preferably thin. However, the thickness of the frame 3a is suitably about 5 mm in terms of strength. In FIG. 1, 5 indicates a chimney chamber, and 6 indicates a side plate of the cooling device 3.

  As shown in FIGS. 2 and 3, in the cooling device 3, the yarn on the cooling device 3 side of the yarn spun from the spinneret 1 is located upstream of the position where the yarn is solidified by the cooling device 3. It is possible to have an initial thread trimming plate 7 that cuts the yarn (on the frame 3a side of the cooling device 3 or the wire mesh 4 installation side) and an inclination that allows all the yarns to fall naturally in a lump after cutting the remaining yarns. A thread trimming apparatus 11 having an inclined plate 8 is provided. In a normal spinning state, the initial thread trimming plate 7 and the inclined plate 8 of the yarn trimming processing device 11 are attracted and held on the side plate 6 of the cooling device 3 using, for example, a magnet. 9a indicates a stopper for the initial thread trimming plate 7 that has been rotated, and 9b indicates a stopper for the inclined plate 8 that has been rotated.

  At the time of yarn breakage, for example, a signal is emitted from a yarn breakage detector provided in the traveling yarn path after the take-up roller, for example, by sending compressed air to a cylinder as an actuator by an electromagnetic valve and pushing the inclined plate 8 first. The initial thread trimming plate 7 arranged so as to be able to operate in conjunction with the inclined plate 8 is tilted as shown in FIGS. At this time, first, the yarn 2 on the cooling device side is cut in advance. Subsequently, as shown in FIGS. 6 and 7, the inclined plate 8 is tilted and the remaining yarn is cut. In this state, all the threads before solidification are sent out onto the inclined plate 8.

  On the inclined plate 8, as shown in FIGS. 8 and 9, the yarn before solidification becomes a lump, and the accumulated lump 10 naturally falls by its own weight as time elapses. It is desirable that the inclined plate 8 is easily slipped (for example, “Teflon” processing) so as to be easily dropped. By performing the “Teflon” processing, the lump 10 can be easily naturally dropped at an angle of 40 to 50 degrees from the horizontal as the inclination angle of the inclined plate 8.

For example, since the density of the polyester is 1.18 g / cm ³ , the density of the lump 10 can be increased to this level, and the bulk density of the lump of the prior art is about 0.04 g / cm ^3. Therefore, the waste yarn processing is greatly facilitated.

  The melt spinning apparatus according to the present invention can also be applied to multiple yarns. Further, as a method of tilting the thread cutting plate, for example, a torque actuator can be used. For example, the plate can be tilted by inserting a wedge between the yarn cutting plate and the side plate by the rotational force of the torque actuator.

  As described above, as shown in FIGS. 10 and 11, the problem that the several yarns on the cooling device side caused when only the inclined plate 12 is tilted to cut the yarn cannot be cut off is the initial thread trimming. By installing the plate 7 together, it was possible to reliably reach the cutting of all yarns. In addition, since the surface of the cooling device and the outermost peripheral yarn are within a specific distance, the thickness uniformity of each yarn can be improved.

1 is a perspective plan view of a melt spinning apparatus according to an embodiment of the present invention in a normal spinning state. FIG. 4 is a longitudinal sectional view taken along line AA of FIG. 3 in a normal spinning state of the apparatus of FIG. 1. It is a front view in the normal spinning state of the apparatus of FIG. It is the longitudinal cross-sectional view seen along the AA line of FIG. 5 which shows the state which the initial stage thread trimming board fell down and cut the thread | yarn by the side of a cooling device in the apparatus of FIG. It is a front view which shows the state of FIG. It is the longitudinal cross-sectional view seen along the AA line of FIG. 7 which shows the state which the inclination board fell down and cut the remaining thread | yarn following the state of FIG. It is a front view which shows the state of FIG. It is the longitudinal cross-sectional view seen along the AA line of FIG. 9 which shows a mode that the melted yarn in the apparatus of FIG. It is a front view which shows the state of FIG. It is the longitudinal cross-sectional view seen along the AA line of FIG. 11 which shows a mode that the lump of the thread | yarn at the time of providing only the inclination board in the prior examination of this invention is dropped. It is a front view which shows the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Outermost thread 3 Cooling device 3a Cooling device frame 4 Wire net 5 Chimney chamber 6 Side plate 7 Initial thread trimming plate 8 Inclined plates 9a and 9b Stopper 10 Mass 11 in which the melted yarn is piled up and collected

Claims (5)

In a melt spinning apparatus having a spinneret for spinning a yarn and a cooling device for cooling and solidifying the spun yarn provided on the downstream side of the spinneret, the yarn spun from the spinneret The distance between the outermost circumferential yarn and the surface of the cooling device is set within 25 mm, and the cooling device among the yarns spun from the spinneret upstream of the position where the yarn is solidified by the cooling device. The side plate of the cooling device is equipped with an initial thread trimming plate that cuts the yarn on the side, and an inclined plate that has an inclination that causes the entire yarn to fall naturally in a solid state after cutting the remaining yarn. A melt spinning apparatus characterized by that. The melt spinning apparatus according to claim 1 , wherein the yarn trimming device is operated based on a detection signal from a yarn break detector provided in a traveling yarn path after the take-up roller. The melt spinning apparatus according to claim 1 or 2 , wherein the initial thread trimming plate is operated in conjunction with the operation of the inclined plate and is operated prior to the operation of the inclined plate. The melt spinning apparatus according to any one of claims 1 to 3 , further comprising an actuator that operates the thread trimming apparatus. The melt spinning apparatus according to claim 4 , wherein the actuator comprises an actuator that operates the inclined plate, and the initial thread trimming plate is operated prior to the operation of the inclined plate in conjunction with the operation of the inclined plate. .

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