JP2002317326A - Melt spinning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melt spinning apparatus capable of quickly re-threading a yarn caught on a suction nozzle in yarn break and decreasing re-threading miss to the utmost. SOLUTION: This melt spinning apparatus is set at least a spinning chimney (4) in which a multifilament yarn (Y) spun from a thermoplastic resin runs and a suction nozzle (3) set above the lowest end inside the spinning chimney and for catching/sucking the spun out yarn (Y); wherein the spinning chimney (4) is composed of a movable component (4a) and a fixed component (4b) and is made its working surface openable with a closing mechanism (8) at the extent that the lowest end (6a) of the movable element (4a) reaches above the set position of the suction nozzle (3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt-spinning apparatus for melt-spinning fibers made of a thermoplastic synthetic resin such as polyester, nylon, polyethylene, and polypropylene. The present invention relates to a melt-spinning apparatus capable of suitably performing a yarn hooking process when a yarn breaks.

[0002]

2. Description of the Related Art Thermoplastic synthetic resins such as polyester, nylon, polyethylene, and polypropylene are melted, spun as multifilaments from a number of discharge holes formed in a spinneret, and are composed of these multifilaments. It is wound up as one thread.

[0003] At that time, the multifilament discharged in a molten state is cooled by a cooling air, and further travels in a spinning cylinder while being applied with an oil agent so as not to be affected by the outside as much as possible. It is finally wound up while being taken up by a take-up roller.

In such a melt spinning apparatus, the winding speed has recently been increased. For example, the winding speed is generally 3000 to 6000 m / min, and recently, the winding speed has been further increased to 7000 m / min.

[0005] Further, in such a melt spinning apparatus, in order to increase the production efficiency, there is also a multi-spindle take-up in which a group of yarns spun from a large number of spinnerets is wound together by a single take-up machine. It is becoming popular. For example, 6 and 8 spindles are very common today.
Equipment with 12 weights has also been developed.

[0006] As the speeding up and the increase in the number of spindles proceed simultaneously, it becomes particularly important to reduce the number of breaks generated during melt spinning in order to improve the yield of yarn production. If the thread break occurs frequently or the thread break process takes time, the loss increases accordingly. However, although it is ideal to reduce the occurrence of thread breaks, it is practically impossible to reduce the number of thread breaks to zero.

Furthermore, in recent years, in order to obtain high value-added yarns, as the number of brands and the differentiation have been promoted, brands that are liable to be broken are spun at a high speed and with a large number of spindles. I have to help. An example of such a case is a case in which a yarn composed of thin multifilaments having a fineness of 1 decitex or less is spun. In addition, in order to impart functions such as sharpness, antistatic property, and easy dyeing property, a case where a yarn in which a modifying agent is contained in a polymer is spun may be used.

Therefore, even if a yarn break occurs in anticipation of the yarn breakage, the broken yarn propagates to the adjacent weight, or a part of the broken yarn becomes fly wool. It is necessary to quickly and accurately perform the thread break processing so as not to jump into the weight of the thread. In addition, if the fly wool is normally spun and wound into the wound yarn, the problem becomes apparent as frequent occurrence of fluff in a warping process for use as a warp in a weaving process.

For the above reason, in order to quickly perform the thread break processing, Japanese Patent Application Laid-Open No. 8-108975 proposes the following thread break processing technique. In this technique, on the one hand, a suction nozzle is provided in the spinning cylinder located slightly above the lower end of the spinning cylinder, and on the other hand, a bundle guide for the yarn group is provided outside the spinning cylinder below the lower end of the spinning cylinder.

With the above construction, once a yarn break occurs, the occurrence of a break is first detected by a yarn break detector, and a yarn break signal is output. In response to the yarn break signal, the bundle guide is operated to bundle a plurality of yarn groups composed of multifilaments on the suction nozzle. Then, the collected yarn group is sucked by the suction nozzle.
Thereafter, the yarn group is cut by a cutter provided below the suction nozzle, and the cut end of the yarn group is captured by the suction nozzle.

[0011] In the technique of performing the yarn breaking treatment below the spinning cylinder, it is difficult to prevent the broken yarn group from accumulating in the spinning cylinder. For this reason, it is inevitable to dispose the suction nozzle inside the spinning cylinder, and it is essential to remove the accumulated yarn outside the spinning cylinder.

At this time, if the spinning is continued in a state in which the yarn break is generated and the yarn group is captured by the suction nozzle, a large amount of waste yarn is naturally generated during the spinning. For this reason, in order to prevent a large amount of waste thread from being generated, it is absolutely necessary to immediately re-thread the thread. Needless to say, when the spinning device is started, yarn hooking is required.

[0013] Such re-threading is performed by catching the yarn with a yarn hooking device generally called a suction gun. In other words, this is performed by winding the suctioned yarn around a take-up roller or the like while the yarn is still being sucked by the yarn hooking tool, and finally depositing the yarn from the suction gun to a winding machine. .

At this time, when starting the re-threading, naturally, it is necessary to cut the thread captured by the suction nozzle and transfer the thread to the thread hook simultaneously with the cutting. Become. However, the problem is, as described above, that the suction nozzle is installed in the spinning cylinder. In such a state, when performing the transfer operation of the yarn from the suction nozzle to the yarn hook, the position of the suction nozzle is hardly visible to the operator. In addition, since the spinning cylinder itself hinders the operation, it is extremely difficult to perform the re-threading operation. Such factors often cause the operator to fail in re-threading.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the problems to be solved by the present invention are as follows.

That is, an object of the present invention is to quickly re-start a yarn which is located slightly above the lower end of a spinning cylinder and is caught by a suction nozzle arranged in the spinning cylinder. An object of the present invention is to provide a melt-spinning apparatus which can perform threading and further minimize failure in re-threading.

[0017]

According to the present invention, there is provided the following apparatus for solving the above-mentioned problems.

That is, as the melt spinning apparatus of the present invention,
"A spinning tube in which a multifilament yarn made of a spun thermoplastic synthetic resin runs, and a suction nozzle provided above a lower end inside the spinning tube and for capturing and sucking the spun yarn In the melt-spinning apparatus in which at least the suction nozzle is provided, the spinning cylinder includes a movable member having a work surface that can be freely opened and closed, and a fixed member provided with the suction nozzle, and a lower end of the movable member has a lower end of the suction nozzle. A melt spinning device "characterized in that the work surface can be freely opened and closed until the work surface reaches a height higher than the disposition position.

At this time, the melt spinning apparatus of the present invention is provided with an opening / closing device for moving the movable member to open and close the work surface. This is preferable because it is not necessary to move the work and the operation can be continued while holding the thread hook.

Further, the opening and closing device of the present invention operates the opening and closing device according to a yarn breakage detection signal from a yarn breakage detector or an operation instruction signal from an operator when a yarn breakage occurs during melt spinning. Such a configuration is preferable in order to promptly perform the thread breaking process.

As such a melt spinning apparatus of the present invention, it is more effective and preferable to use a multi-spindle spinning apparatus which is greatly affected by the occurrence of yarn breakage.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view (front view) schematically illustrating a melt spinning apparatus of the present invention.
It is. In FIG. 1, reference numeral Y denotes a spun yarn group composed of multifilaments, and the yarn group is spun from a spinneret group denoted by reference numeral 1. FIG. 1 illustrates a six-spindle spinning device composed of six spun yarn groups. However, of course, 4
Needless to say, the weight may be 8-weighted or 12-weighted, but the more the number of weights, the greater the role of the present invention.

Next, reference numeral 2 denotes a cooling device, and the yarn group Y spun from the spinneret group 1 is solidified while being thinned by the cooling air blown out in the cooling section. Reference numeral 3 denotes a suction nozzle for sucking and catching the yarn when a yarn break occurs or when the yarn is hooked.

Reference numeral 4 denotes a spinning cylinder, which is connected to a lower end of the cooling device 2. The suction nozzle 3 is disposed inside the spinning tube 4 as shown in the drawing, and is located slightly above the lower end 6 of the spinning tube.

Each of the spun yarn groups Y is supplied with an oil agent by the oil supply guide indicated by reference numeral 5. Thereafter, when the yarn is taken up by a take-up roller (not shown), the yarn is finally wound up as a yarn package by a winding machine (not shown) while being subjected to a process such as entanglement.

In the above-described melt-spinning apparatus, when a yarn break occurs, a yarn break detector (not shown) for detecting the occurrence of the break as soon as possible and transmitting a break generation signal.
Is provided. Usually, such a yarn break detector is often provided at the most downstream position (that is, a position immediately upstream of the winding machine).

In such a melt spinning apparatus, once a yarn break occurs, a yarn break generation signal from the yarn break detector is sent to the yarn break processing apparatus described in JP-A-8-108975. A thread breaking process is performed. Alternatively, an alarm is performed based on the yarn break generation signal, so that the worker performs the yarn break processing.

The above-described melt spinning apparatus will be described in detail with reference to FIGS. 2 and 3. FIGS. 2 and 3 are schematic views (side views) illustrating the melt spinning apparatus of the present invention. FIG. 2 shows a state in which the yarn group Y to be spun by the yarn breakage processing is sucked and captured by the suction nozzle 3, and FIG.
A state in which the yarn group Y is being transferred from the suction nozzle 3 to the yarn hooking device 7 is shown.

In FIGS. 2 and 3, reference numeral 4
"a" indicates a movable member portion of the spinning tube 4, and reference numeral 4b indicates a fixed member portion of the spinning tube 4. As shown in these figures, on the other hand, a suction nozzle 3 for sucking and capturing the yarn group Y subjected to the thread break processing is provided on the fixed member 4a. On the other hand, the movable member 4b is configured such that its working surface can be opened and closed via an opening and closing device 8 indicated by reference numeral 8.

When re-threading is performed on the melt-spinning apparatus constructed as described above, first, the opening and closing device 8 is operated to pull up the movable member 4a of the spinning cylinder in the direction of the arrow in FIG. Open. At that time, it is necessary to secure a space as a work surface to be opened until the lower end 6a of the movable member reaches a height equal to or higher than the position where the suction nozzle 3 is provided.

This is because, in this way, the thread hooking operation can be performed while checking the yarn group Y captured by the suction nozzle 3 with the naked eye of the operator. By making such a situation appear, it is possible to reduce the probability that a worker will make a threading mistake when re-threading.

Here, the actual operation of the yarn hooking operation will be briefly described. As shown in FIG. 3, the movable member 4a of the spinning cylinder is moved to the position shown in FIG. The thread hook 7 is moved closer to the suction nozzle 3. The opening of the movable member 4a is performed by operating the opening / closing device 7 according to a yarn breakage detection signal from the yarn breakage detector (not shown) or an operation instruction signal from an operator.

At this time, a suction gun is usually used as the thread hook 7. And, as this suction gun, compressed air is blown out in the suction direction of the yarn, and the compressed air that is blown is accompanied by the yarn, and the air is sucked by a vacuum generator or a blower, etc.
A vacuum suction system in which the yarn is accompanied by the sucked air is generally used. Among these suction systems, the compressed air injection system can use the swirl flow purified by the compressed air, and therefore the yarn suction force is strong and preferable.

The thread hook 7 is brought closer to the suction nozzle 3 and the thread hook 7 is positioned upstream of the suction nozzle 3. Then, between the yarn hooking device 7 and the suction nozzle 3, the yarn end that has been cut by cutting the yarn Y that has been sucked and captured by the suction nozzle 3 is cut by the yarn hooking device 7.
Aspirate and capture. At this time, as described above, since the work surface is in the open state, the worker can firmly identify the yarn Y being sucked, cut the yarn Y, and transfer the yarn Y to the yarn hooking device 7.

In such a threading operation,
It is preferable that the lower end 6a of the movable member 4a of the spinning cylinder be slid in the direction of the arrow shown in the figure so that it can be opened and closed, because the working space can be further enlarged. Further, the lower end 6b on the side of the fixing member 4b may also be movable in the front-rear direction.

As shown in the figure, if the oil supply guide 5 can be freely moved back and forth as shown in FIG. Then, the possibility that the threading tool 7 or the like comes into contact with the oil supply guide 5 during the threading operation and is damaged is reduced.

As described above, by using a part of the spinning tube 4 as the movable member 4a, the work surface at the time of threading can be freely opened and closed, and a wide work space can be secured. At this time, as the opening / closing device 8 that allows the movable member 4a to be freely opened and closed, a fluid pressure operated cylinder that is operated by air pressure and / or oil pressure can be suitably used. In addition, it is needless to say that a known electric drive device that operates by electric force is not limited to the fluid pressure operation cylinder.

The movable member 4 is used to open the work surface.
The direction in which a is moved is not limited to the vertical direction shown in the figure, and a structure in which the lower end of the cooling device 2 swings by rotatably supporting the upper end of the movable member 4a may be employed. That is, what is important in the present invention is that the work surface can be sufficiently opened before starting the thread hooking operation.

In this way, at an appropriate opportunity from the time when the yarn Y being captured by the suction nozzle 3 and being suctioned is transferred to the yarn hooking device 7 to the time immediately after the yarn hooking to the melt spinning device is completed, the yarn Y is again taken up. Activate the opening / closing device 7 to move the movable member 4 of the spinning cylinder.
a is returned to the position of FIG.

[0040]

As described above, according to the melt-spinning apparatus of the present invention, the yarn is hooked from the suction nozzle 3 at the time of re-threading after the yarn breakage processing or when the melt-spinning apparatus is started. Thus, the yarn can be quickly and reliably transferred to the tool 7. For this reason, threading mistakes are reduced. Furthermore, when the present invention is applied to a melt spinning apparatus having a high spinning speed with a multi-spindle take, there is an extremely large effect that it is possible to reduce the generation of a large amount of waste yarn in a short time at the time of thread breakage or the like. . The filament fineness is 1
When spinning a yarn consisting of thin multifilaments of less than decitex, or in order to impart functions such as sharpness, antistatic properties, and easy dyeability, use a yarn in which a polymer contains a modifier. The present invention has an extremely remarkable effect also when performing melt spinning in which yarn breakage is likely to occur, such as in the case of spinning.

[Brief description of the drawings]

FIG. 1 is an explanatory view (front view) schematically illustrating a melt spinning apparatus of the present invention.

FIG. 2 is an explanatory view (side view) schematically illustrating the melt spinning apparatus of the present invention, and shows a state where a thread hooking work surface of a spinning cylinder is closed.

FIG. 3 is an explanatory view (side view) schematically illustrating the melt spinning apparatus of the present invention, and shows a state in which a thread hooking work surface of a spinning cylinder is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinneret group 2 Cooling device 3 Suction nozzle 4 Spinning cylinder 4a Movable member part of spinning cylinder 4b Spinning cylinder fixing member part 5 Oil supply guide 6 Lower end of spinning cylinder 6a Lower end of movable member 6b Lower end of fixing member 7 Thread hook 8 Opening / closing device Y Spun yarn group

Continuing on the front page (72) Inventor Yasushi Maekawa 77 Kitayoshida-cho, Matsuyama-shi, Ehime F-term in Teijin Limited Matsuyama Office (reference) 4L045 AA05 DA60 DC30 DC40

Claims (4)

[Claims] 1. A multifilament yarn made of a spun thermoplastic synthetic resin runs in a spinning tube, and a multifilament yarn is provided above a lower end inside the spinning tube, and captures and sucks the spun yarn. In the melt spinning device provided with at least a suction nozzle for the spinning cylinder, the spinning cylinder is constituted by a movable member having a work surface that can be freely opened and closed and a fixed member provided with the suction nozzle, and a lower end of the movable member is further provided. A melt spinning apparatus, wherein a work surface until the height reaches a height equal to or higher than the disposition position of the suction nozzle is freely openable and closable. 2. The melt-spinning apparatus according to claim 1, further comprising an opening / closing device for opening and closing the work surface by moving the movable member. 3. The melt spinning apparatus according to claim 2, wherein the opening / closing device is operated by a yarn breakage detection signal from a yarn breakage detector or an operation instruction signal from an operator. 4. The melt spinning device according to claim 1, which is a multiple spindle device.