JP2008002006A - Melt spinning assembly for synthetic fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt spinning assembly for synthetic fiber, capable of extremely effectively suppressing the growth of foreign matter deposited around the nozzles on a spinneret without causing yarn unevenness through uniformly exhausting air current stagnant under the spinneret. <P>SOLUTION: The melt spinning assembly for synthetic fiber with a cover on top of its spinneret pack is such that the cover is furnished with a filter through which air current stagnant under the spinneret is exhausted in a uniform flow condition. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a melt spinning apparatus used for producing a thermoplastic synthetic fiber. More specifically, the present invention relates to a stable discharge of an air current staying under a spinneret, and the occurrence of yarn unevenness and yarn breakage. The present invention relates to a synthetic fiber melt spinning apparatus capable of extremely effectively suppressing the accumulation growth of foreign matter around the spinneret polymer discharge hole surface without causing deterioration in operability.

  Thermoplastic synthetic fiber is used for various applications in clothing and industry as a fiber having high strength and excellent handling. Among them, fibers obtained by melt spinning such as polyester and polyamide are known to be capable of adding various functions by adding cross-sectional shapes and particles, and are widely used.

  On the other hand, if melt spinning of a thermoplastic polymer such as polyamide or polyester is continuously performed for a long time, polymer soaking or sublimate generated by thermal decomposition of the polymer adheres to the periphery of the base polymer discharge hole surface, Deposition growth. In this way, when the deposition growth is promoted to some extent, the discharged polymer and the foreign matter come into contact with each other, and the foreign matter is not discharged uniformly, and there is a problem that the resulting yarn becomes uneven or the operability deteriorates due to the occurrence of yarn breakage. is there.

  For this reason, the polymer discharge hole surface of the spinneret must be periodically cleaned or the spinneret pack must be replaced.

  However, frequent cleaning of the spinneret polymer discharge hole surface and replacement of the spinneret pack require manual labor and expendable parts, which increases costs and reduces the frequency of these operations. is important.

  Therefore, various methods have been tried to suppress the accumulation growth of foreign substances adhering to the polymer discharge hole surface of the spinneret. For example, as a technique for discharging gas staying under a spinneret of a spinneret pack attached to a spin block, a melt spinning apparatus provided with an exhaust tube penetrating the spinneret pack has been proposed (for example, Patent Document 1). reference). However, there is a problem that yarn unevenness is likely to occur because the discharge of the gas from the exhaust pipe has poor uniformity and cannot maintain the rectified state.

  Also, there is a device that blows gas to the spinneret pack and seals the polymer discharge hole surface (see, for example, Patent Document 2), and supplies inert gas to the spinneret polymer discharge hole surface through a supply pipe However, a device for sealing the spinneret polymer discharge hole surface and sucking monomers and the like from the suction port (see, for example, Patent Document 3) has been proposed. However, it is discharged from the spinneret by gas blowing or suction. There is a problem in that the yarns are swayed and thread spots are likely to occur.

Further, since an inert gas is used, there is a problem that a running cost is significantly increased.
Japanese Patent Laid-Open No. 11-350237 JP-A-11-172519 Japanese Utility Model Publication No. 5-85862

  In order to solve the problems described above, the problem to be solved by the present invention is that the melt spinning apparatus used when producing the thermoplastic synthetic fiber discharges the airflow staying under the spinneret in a stable state, To provide a synthetic fiber melt spinning apparatus capable of extremely effectively suppressing foreign matter accumulation growth around the spinneret polymer discharge hole surface without causing generation and deterioration of operability such as yarn breakage. It is in.

The present invention adopts the following configuration in order to achieve the above-described problems. That is,
(1) A synthetic fiber melt spinning apparatus having a lid at the top of a spinneret pack, wherein the lid is provided with a filter that rectifies and discharges the airflow retained under the base. .

  (2) The synthetic fiber melt spinning apparatus according to (1), wherein the filter provided on the lid is annular.

  (3) The synthetic fiber melt spinning apparatus according to (1) or (2), wherein the filter is composed of a rectifying member and a wire mesh.

  (4) The synthetic fiber melt spinning apparatus according to (3), wherein the flow straightening member of the filter has a honeycomb structure.

  In the melt spinning apparatus having a lid on the top of the spinneret pack attached in the spin block, the gas staying under the spinneret is discharged in a rectified state, so that the operability such as occurrence of yarn unevenness and yarn breakage is deteriorated. Therefore, the frequency of periodic cleaning of the spinneret polymer discharge hole surface and replacement of the spinneret pack can be greatly reduced.

  In addition, it is not necessary to introduce or modify complicated equipment under the spinneret pack or the spinneret pack, and because it focuses only on the lid structure, it is easy to manufacture and can be processed and maintained at low cost. It becomes.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a front sectional view illustrating a melt spinning apparatus of the present invention. In the figure, the spinneret pack 3 is mounted and fixed in a spin block 6. The attached spinneret pack 3 is heated by a spin block 6, supplied with molten polymer from the side of the spinneret pack 3, passes through the spinneret pack 3, and is discharged from the base 4 indicated by a wavy line. Then, the yarn 7 is formed, cooled and solidified, and wound.

  At this time, since it is necessary to keep the heating temperature of the spinneret pack 3 constant, the lid 1 is installed on the upper part of the spinneret pack 3. Normally, the lid 1 is installed only for heat insulation and does not have an airflow discharge function. In the current melt spinning apparatus, the spinneret polymer discharge hole surface seal and airflow by the inert gas under the spinneret are used. In general, in the present invention, attention is paid to the lid 1 installed on the upper part of the spinneret pack 3, and the lid 1 has a function of rectifying and discharging the gas staying under the spinneret. It is characterized by providing the filter which has.

  Next, the rectification and discharge function of the lid 1 of the present invention will be described in detail. As shown in FIG. 1, there is a clearance between the spinneret pack 3 and the spin block 6, and the gas staying under the spinneret is high in temperature, and therefore rises with sublimates generated by the thermal decomposition of the polymer. Then, it passes through the clearance between the spinneret pack 3 and the spin block 6, passes through the filter 2 installed on the lid 1 at the top of the spinneret pack 3, and is discharged to the outside.

  At that time, in order to keep the rectification under the spinneret, the discharge of the air flow must be uniform. Therefore, the shape of the filter 2 is preferably annular as shown in FIG.

Further, as shown in FIG. 3, the filter 2 preferably has a structure in which a wire mesh 8 is disposed at the upper part and the lower part and is configured with a rectifying member 9, and more preferably, the structure of the rectifying member 9 is a honeycomb structure. By doing so, the rectification and discharge effect under the spinneret can be further exhibited.
The rectifying member 9 has a structure in which an infinite number of holes 10 pass therethrough, and as shown in FIG. 4, the arrangement of the holes 10 must be uniform. 10 can be disposed, and further, weight reduction can be obtained without impairing the strength of the rectifying member 9.

  In addition, it is preferable that the shape of the hole 10 is circular, More preferably, by making it hexagonal shape, the arrangement | positioning and weight reduction of the hole 10 of the rectifying member 9 can be exhibited more efficiently.

  Needless to say, the basis weight of the wire mesh constituting the filter 2 and the hole specifications of the rectifying member are adjusted so as not to cause a decrease in the temperature of the spinneret pack 3.

  The lid 1 of the present invention can be easily removed and transported, and even when the filter 2 is clogged with a monomer or the like, it can be easily removed by air blow or the like, and is excellent in maintainability.

It is front sectional drawing which shows an example of the melt spinning apparatus of this invention. It is a top view which shows an example of the lid | cover used by this invention. It is side surface sectional drawing which shows an example of the filter used by this invention. It is a top view which shows an example of the baffle member used by this invention.

Explanation of symbols

1: Lid 2: Filter 3: Spinneret Pack 4: Spinneret 5: Housing 6: Spin Block 7: Thread 8: Wire Mesh 9: Rectification Member 10: Hole

Claims (4)

  A synthetic fiber melt spinning apparatus having a lid at the top of a spinneret pack, wherein the lid is provided with a filter that rectifies and discharges an airflow staying under the base.   The synthetic fiber melt spinning apparatus according to claim 1, wherein the filter provided on the lid is annular.   The synthetic fiber melt spinning apparatus according to claim 1 or 2, wherein the filter is composed of a rectifying member and a wire mesh.   The synthetic fiber melt spinning apparatus according to claim 3, wherein the flow straightening member of the filter has a honeycomb structure.

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