JPH0639726B2 - Synthetic fiber melt spinning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial field of application} The present invention provides a fiber-forming polymer containing a pressurized gas, a depressurized gas,
The present invention relates to an improvement in a melt-spinning apparatus for a thermoplastic polymer, in which a yarn having high orientation and excellent uniformity is obtained by spinning in an atmosphere of water vapor, liquid, etc., and then taking it out in an atmosphere of external normal pressure.

{Prior Art} After melting a thermoplastic polymer and cooling and solidifying the yarn spun out from a spinneret, it is oiled and wound at a constant speed. There are problems that the uniformity of physical properties such as fineness and strength / elongation is insufficient, and the degree of orientation cannot be easily improved.

In order to solve these problems, many proposals have been made to try to improve the yarn by spinning the yarn in an atmosphere different from the atmospheric pressure and taking it out.

For example, Japanese Patent Publication No. Sho 49-36046 discloses a method in which a polymer is spun into a pressure chamber having multiple stages to obtain fibers.

Japanese Patent Publication No. 57-8206 discloses a method of introducing a polymer into a spinning cylinder whose pressure is reduced to 1 atm or less.

Further, Japanese Patent Publication No. 57-47283 discloses a method in which a polymer is spun into a spinning tube made of fibers of pressurized steam to obtain fibers.

In addition, Japanese Patent Publication No. 38-2016 discloses a method in which melt-spun yarn is passed through a liquid tank provided under a spinneret to form fibers.

On the other hand, as a sealing device, there is a device described in JP-A-52-99348.

{Problems to be solved by the invention} Thus, depending on the target quality, type of fiber, etc.,
It has been proposed that the atmosphere in the spinning cylinder in which the polymer is spun is different, but in any case, in order to fiberize an atmosphere different from the atmospheric pressure, a fluid seal is created at the exit of the yarn. It is necessary to have a mechanism. If the fluid seal is insufficient, the atmosphere in the spinning cylinder can be set to a condition very close to atmospheric pressure, and the desired effect cannot be expected. In addition, the running cost for maintaining the state inside the spinning cylinder is also greatly increased. Furthermore, at the yarn outlet, the flow of the fluid easily causes the yarn to be disturbed, resulting in a difference in yarn length between fibers, unevenness in quality, and deterioration in the quality of the obtained fiber.

Therefore, in the method described in JP-B-49-36046, the method described in JP-B-57-47283, and the method described in JP-B-38-2016, a stick-shaped sealing member is used. It has been shown to use an axially pierced hole or a multi-stage labyrinth hole in the central part of the body. However, in such a sealing method, even if the hole diameter is small, the hole diameter is limited to about 1 mm at the maximum due to the restriction of the processing hole accuracy, and the outflow loss of the medium forming the atmosphere in the rod thread cylinder is by no means small. It is still left. Further, it is extremely difficult to pass the spun yarn through the pores of the outlet, which is a practical problem.

On the other hand, Japanese Patent Publication No. 57-8206 discloses a method of sealing a yarn outlet part by using a pair of rubber rollers. However, it is necessary to keep the rollers close to each other.
Particularly, the higher the speed is, the more difficult it is, and the sealing between the roller and the spinning cylinder is required. This makes the device extremely complicated, and the rubber roller easily wears. I can't say.

On the other hand, as a sealing device, there is a device described in JP-A-52-99348. If this device is used for the seal portion of the spinning cylinder, the outflow loss of the atmosphere in the spinning cylinder is considerably improved, but it has the drawback that the yarn breakage easily occurs during the yarn hooking operation.

That is, since the thread passage groove is provided in the cylindrical plug to be inserted / removed, it is difficult to insert the plug into the cylindrical housing while guiding the thread traveling at high speed into the groove. The problem still remains that the single yarn comes off from the groove even if it is removed, and is caught between the plug and the housing and cut.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, effectively seal the yarn outlet of the bottom of the spinning tube, and cause the yarn spun in the spinning tube to be broken or rubbed. It is an object of the present invention to provide a synthetic fiber melt-spinning device that can be easily pulled out from the yarn outlet portion and hooked on a take-up means without the need.

{Means for Solving the Problems} In order to achieve the above object, the present invention provides a thermoplastic polymer, directly below the spinneret, surrounding the spinneret and along the yarn path of the spun yarn. An extending spinning cylinder is arranged, and a yarn outlet portion fluidly sealed at a lower end portion of the spinning cylinder is provided,
And, in the melt spinning apparatus for synthetic fibers, which has a means for taking out spun yarns outside the spinning cylinder, the yarn outlet portion includes: (a) an inner peripheral surface along a traveling direction of the yarns, and ,
A tubular member provided with a narrow groove having a cross-sectional area slightly larger than the yarn, and (b) an opening side of the narrow groove of the tubular member, which is detachably fitted into the cylinder of the tubular member. And (c) a guide member which is provided between the tubular member and the take-up means and which guides the yarn on the extension of the axis of the narrow groove of the tubular member. It is characterized by being formed.

{Example} An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the melt spinning apparatus according to the present invention.

Immediately below the spinneret 1, there is provided a spinning cylinder 2 that surrounds the periphery of the spinneret and extends along the yarn path of the spun yarn Y. Inside the spinning cylinder, there is compressed air from a communicating pipe 3. Water vapor, liquid, or the like is supplied or is extracted from the communication pipe 3 and kept in a reduced pressure state.

A hollow cylinder having a yarn passage groove 17 on the inner peripheral surface, which has a cross-sectional area slightly larger than the traveling yarn Y and has an inner peripheral surface on the opening side, at the lower end of the spinning tube 2. The member 4 is attached and is interchangeably locked to the spinning tube 2 by the flange 5 and the bolt 6. Further, a cylindrical plug 7 is removably inserted into the hollow cylindrical member 4 such that the outer peripheral surface of the hollow plug 4 closes the opening side of the yarn passage groove 17.

The traveling yarn Y is drawn out of the spinning tube 2 through a yarn passage groove 17 provided in the hollow cylindrical member 4, and a take-up device such as a winder (not shown) via a guide member 9. Be led to. In the figure, 8 is a stop pin for fixing the cylindrical plug 7 to the hollow cylindrical member 4.

2 is an enlarged longitudinal sectional view of a yarn passage groove portion which is a yarn outlet portion provided at the lower end portion of the melt spinning device of FIG. 1, and FIG. 3 is a yarn passage groove portion of FIG. It is an AA arrow sectional view.

Spinneret 2, hollow cylindrical member 4, and hollow cylindrical member 4
The fitting state between the cylindrical plug 7 and the cylindrical plug 7 minimizes the fluid leakage between the inside of the spinning tube and the outside atmospheric pressure and atmospheric pressure. it can. If necessary, a gasket 10 may be interposed between the spinning tube 2 and the hollow cylindrical member 4 to further reduce the leakage.

The cylindrical member 4 and the columnar plug 7 are preferably cylindrical or columnar as in the above-mentioned embodiment, but may be rectangular.

The cross-sectional shape of the thread passing groove 17 provided on the circumferential surface of the tubular member 4 can be arbitrarily selected from a rectangular shape, a triangular shape, a semi-elliptical shape, a U shape, and the like.

The width and depth of the yarn passage groove 17 differ depending on the denier of the yarn to be spun, but in order to further reduce the biting of the running yarn into the fitting portion, it is deeper than the groove width. Has been made bigger.

In any case, unlike the sealing device conventionally used in this type of spinning device, it is possible to make the yarn passage groove extremely narrow, and the flow of the fluid in the yarn passage groove can be reduced, The swaying of the yarn due to the flow of the fluid does not significantly occur, and the entanglement between the yarn single yarns does not occur.

The inner surface of the yarn passing groove 17 is finished to such an extent that the yarn is not scratched and damaged, but at the same time, as shown in FIG. 4, a liquid such as an oil agent or the like normally required in the spinning step is placed in the yarn passing groove. If the yarn is discharged, the yarn damage can be prevented more effectively.

That is, FIG. 4 shows another embodiment in which a liquid discharge port for an oil agent or the like is opened in the yarn passage groove 17 in the enlarged vertical sectional view of the yarn passage groove portion shown in FIG. In this figure, a liquid such as an oil agent is supplied to a supply hole 12 from a supply pipe 11 provided in the lower part of the spinning cylinder 2, and the hollow cylindrical member 4
Is introduced into the pores 13 communicating with the oil agent supply holes 12.
The O-rings 14 and 14 'are mounted on the outer peripheral surface of the hollow cylindrical member 4 in order to prevent the oil agent from leaking out. This not only eliminates the need for a complicated device for supplying a liquid such as an oil agent, which is required in a normal spinning process, but also the pores 13 are exposed at the bottom of the yarn passage groove 17. Therefore, the liquid such as the oil agent efficiently adheres to the running yarn, and has a great effect in reducing the frictional resistance inside the groove.
At the same time, the yarn is provided with a converging property, so that the yarn runs stably.

The above is an example of the melt spinning apparatus for one yarn,
In the case of a multi-fiber melt-spinning device that draws yarns spun from the same spinner into a plurality of yarn groups and draws them, it is possible to deal with them very simply by replacing the hollow cylindrical member.

That is, FIG. 5 is a cross-sectional view of the yarn passage groove portion in the case of two yarns, and the yarn passage grooves 17 and 17 'provided on the circumferential surface of the hollow cylindrical member 4 are used to take up the yarn passage group. By using the hollow cylindrical member 4 having the number corresponding to each of Y and Y ′, it is possible to easily deal with melt spinning of multiple yarns.

{Operation} Next, the operation of the present invention will be described focusing on the thread hooking operation procedure.

In FIG. 1, a three-way valve (not shown) at the inlet of the communication tube 3 is used to supply pressurized air, water vapor, liquid, etc. into the spinning tube 2 or extract air from the spinning tube 2. At the same time as closing, the inside of the spinning tube 2 is brought into communication with the outside air and brought into a normal pressure state. After that, the stopper pin 8 is pulled out and the columnar plug 7 is pulled out from the hollow cylindrical member 4 to form an opening. In this state, the yarn spun from the spinneret is pulled out from the hollow cylindrical opening, and is pulled by a suction ejector or the like.

In the present invention, since the opening area can be widened during threading, there is an advantage that the work can be easily carried out particularly when the waste of the spun yarn accumulated inside the spinning tube is pulled out of the spinning tube 2. .

Next, the yarn Y is taken out by an ejector, hung on the guide member 9, and guided so that the yarn Y travels inside the yarn passage groove 17 on the inner peripheral surface of the hollow cylindrical member 4. After that, the cylindrical plug 7 is inserted into the hollow cylindrical member 4, locked by the pin 8, and the three-way valve (not shown) is operated to shut off the inside of the spinning tube 2 from the outside air. Then, pressurized air, water vapor, fluid or the like is supplied to the inside of the spinning tube 2 or air is extracted from the spinning tube 2 to complete the yarn hooking operation.

The point of this operation is to insert the cylindrical plug 7 into the hollow cylindrical member 4, and to insert the yarn Y into the yarn passage groove 17 on the inner peripheral surface of the hollow cylindrical member 4 and the guide member 9 or the like. You can use the to guide you. When the yarn Y is out of the groove, the single yarn may be sandwiched between the hollow cylindrical member 4 and the cylindrical plug 7 and cut. However, according to the present invention, since the yarn passing groove 17 is provided in the hollow cylindrical member 4 fixed to the spinning tube 2, it is easy to stably keep the yarn Y in the yarn passing groove, and the yarn hooking operation is performed. Can be extremely reliable.

It is noted that the guide member 9 is configured to be movable back and forth in a direction substantially perpendicular to the yarn Y, and while the cylindrical plug 7 is inserted into the hollow cylindrical member 4, the device shown in broken line in FIG. 1 is slightly exaggerated. If the guide member is kept in place and the columnar plug is inserted and then returned to the position shown by the solid line, the risk of pinching the thread described above is further reduced, and when inserting the columnar plug 7, Since the members do not get in the way, the threading operability is remarkably improved.

Further, during normal operation after threading, the winding angle of the thread around the guide member 9 can be made small, so that it is possible to obtain an effect that a thread of excellent quality can be obtained.

Furthermore, in order to improve the operability when inserting the cylindrical plug 7 into the hollow cylindrical member 4, the yarn Y is once provided near the spinneret 1 side of the hollow cylindrical member 4. It is advisable to provide a guide member for focusing.

That is, FIG. 6 is an enlarged cross-sectional view of the yarn passage groove portion shown in FIG.
A guide member 16 having a slit 15 having substantially the same width as the yarn passing groove on the inner peripheral surface of the hollow cylindrical member 4 is provided in the vicinity of the yarn Y so as to face the yarn Y. In addition,
FIG. 7 is a view on arrow XX in FIG. By doing so, the yarn Y is once moved to the guide member 16
Since it enters the yarn passage groove of the hollow cylindrical member 4 after being converged by, the spread of the single yarn is reduced, and the operation of inserting the cylindrical plug 7 into the hollow cylindrical member 4 becomes easy. In addition, the risk of biting the single yarn during normal operation is further reduced,
The seam due to the end of the yarn passage groove of the yarn Y is also reduced,
It also has the effect of improving quality.

The shape of the guide member 16 is not limited to the slit 15 and may be a guide of any other known shape as long as it is a shape such as a so-called pigtail guide that facilitates threading.

Although the case of one yarn has been described above, it goes without saying that the advantages of the above-described yarn hooking operability become more remarkable when the number of yarns increases.

{Effects of the Invention} The present invention has the configuration as described above,
It has the following excellent effects.

Since the yarn outlet portion is composed of a tubular member, a columnar plug, etc., it is possible to increase the area of the opening portion when threading,
It is extremely easy to pull out the spun yarn inside the spinning tube to the outside of the spinning tube.

Further, since the yarn passage groove is provided on the side of the fixed cylindrical member, the yarn path is easily stabilized during the yarn hooking operation, and the insertion operation of the columnar plug is facilitated.

Since the yarn passage groove is a narrow groove with a narrow cross-sectional area, the flow of fluid in the yarn passage groove is reduced, and the atmosphere inside the spinning tube can be sealed sufficiently compared with the conventional device, and the spinning conditions can be wide range. In addition, the yarn is not disturbed by the fluid flow in the seal portion, and the yarn of stable quality can be obtained.

When the yarn inside the spinning tube is pulled out and hooked on an external take-up means or the like, the guide member that constitutes the yarn outlet portion causes the yarn to pass through the yarn passage groove on the inner peripheral surface of the tubular member. Since it can be guided to the guide member once after it is placed along the line, it is easy to keep the thread stably in the thread passing groove, and when the columnar plug is attached to the tubular member, the thread is not moved from the thread passing groove. It will not come off and will not be pinched and cut by the single-thread cylindrical member and the columnar plug.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the synthetic fiber melt-spinning apparatus according to the present invention, and FIG. 2 is an enlarged vertical cross-sectional view of a yarn passage groove portion in the melt-spinning apparatus of FIG. 3 is a sectional view of the yarn passing groove portion taken along the line AA in FIG. 2, and FIG. 4 is a vertical sectional view of the yarn passing groove portion showing another embodiment of the device according to the present invention. . FIG. 5 is a cross-sectional view of a yarn passage groove portion showing still another embodiment of the device according to the present invention. FIG. 6 is a longitudinal sectional view of a yarn passage groove portion showing still another embodiment of the device according to the present invention. Figure 7 shows
FIG. 7 is a sectional view taken along line XX of FIG. 6. DESCRIPTION OF SYMBOLS IN THE DRAWING 1 ... Spinneret 2 ... Spinning tube 3 ... Communication tube 4 ... Hollow cylindrical member 5 ... Flange, 6 ... Bolt 7 ... Cylindrical plug, 8 ... Stopping pin 9 ... Guide member, 10 ... Gasket 11 ... Supply pipe, 12 ... Supply hole 13 ... Pore, 14, 14 '... O-ring 15 ... Slit, 16 ... Guide member 17 ... Thread Passage groove Y, Y '... Thread

Claims (1)

[Claims] 1. A spinning cylinder, which surrounds the spinneret and extends along a yarn path of a spun yarn, is arranged immediately below a spinneret of a thermoplastic polymer, and a fluid is provided at a lower end portion of the spinning cylinder. In a melt-spinning apparatus for synthetic fibers, which has a dynamically sealed yarn outlet, and has a spun yarn take-out means outside the spinning cylinder, the yarn outlet is (a) the inner circumference. On the surface, along the running direction of the yarn, and
A tubular member provided with a narrow groove having a cross-sectional area slightly larger than the yarn, and (b) an opening side of the narrow groove of the tubular member, which is detachably fitted into the cylinder of the tubular member. And (c) a guide member that is provided between the tubular member and the take-off means and that guides the yarn on the extension of the axis of the narrow groove of the tubular member. A melt-spinning device for synthetic fibers, which is characterized by being formed.