JP2010095827A - Melt-spinning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt-spinning apparatus having an annular cooling device for cooling a fiber and placed under a melt spinning nozzle to spin a thermoplastic polymer, wherein the annular cooling device includes a cylindrical metal air filter resistant to the temperature of spinning, exhibits circumferential flow regulation effect of cooling air at a cooling start position, reusable without deteriorating the flow regulation effect at the cooling start position even by being replaced and cleaned after used for a long time, and having a ring-formed reinforcing member attached to the upper end. <P>SOLUTION: The melt-spinning apparatus is provided with an annular fiber-cooling device under the melt-spinning nozzle, wherein the annular cooling device includes a cylindrical metal air filter having a flow regulation effect, and the cylindrical metal air filter is provided with a ring-formed reinforcing member on the upper end surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a melt spinning apparatus for thermoplastic polymers such as polyester and polyamide, and more particularly, a metal air filter that rectifies air for cooling discharged polymer in the process of spinning molten synthetic fiber. By attaching a reinforcing member to the upper end of the filter, it can be applied to high-temperature spinning, improving the circumferential rectification effect at the cooling start position, that is, the upper end surface portion of the cylindrical metal filter, and reducing yarn unevenness and washing The present invention relates to a melt spinning apparatus for the purpose of being able to be recycled for a long time.

  A method of cooling a spun yarn after melting a thermoplastic polymer such as polyester or polyamide from a spinning hole drilled in a spinneret is a generally known technique in a melt spinning process. This cooling process is known to have a great influence on yarn strength, elongation, dyeability, and the like after spinning, particularly in garment long fibers.

  In recent years, in order to increase the texture and functionality of yarns, the single yarn fineness tends to be thin and the number of filaments tends to increase, and the conventional cooling air is blown from one direction over a certain length to lay the yarns. In the cooling device for cooling, cooling spots between single yarns are generated due to the difference in the blowing state of the cooling air. That is, the cooling state is different between the yarn positioned on the cooling air blowing side and the yarn positioned on the anti-blowing side, thereby generating cooling spots.

  An annular cooling device using a cylindrical air filter having a rectifying effect is used to uniformly cool a thermoplastic polymer having a small single yarn fineness and a large number of filaments. After the yarn is melted from the spinning hole, it travels inside or outside the cylindrical air filter of the annular cooling device and is cooled by the cooling air blown radially. The cylindrical air filter is generally made of paper, but it is necessary to cool and solidify the polymer discharged from the die hole more rapidly as the single yarn fineness decreases. The position at which the polymer discharged from the cooling and solidification comes closer to the base surface side, and the paper cylindrical air filter must also be brought closer to the base surface, but if it is made of paper, it is heated by the spinning temperature. The problem of being burned occurs.

  In order to solve this problem, a strip-shaped metal tape having a uniform uneven shape in the longitudinal direction is formed by rotating and laminating, forming a cylindrical body, sintering, and radial pore groups for rectifying cold air. A metal air filter characterized by being provided has been proposed (see, for example, Patent Document 1). In the cooling technique, the rectification of the cooling air at the position where the polymer begins to cool and solidify (hereinafter referred to as the cooling start position) is the most important, and the upper end surface corresponds to that position in the cylindrical metal air filter.

  However, since the above cylindrical metal air filter is a band-shaped metal tape with unevenness, the upper end surface is distorted, and a gust of wind blows out from a part of the radial cold air, or the wind does not come out from a part. There is a problem in that the rectifying effect at the cooling start position becomes poor and causes cooling spots.

  Also proposed is a metal air filter characterized by forming a cylindrical body while winding a wire mesh woven with strands in multiple layers, sintering, and radial pore groups for rectifying cold air (For example, refer to Patent Document 2).

  However, since the wire mesh is wound in multiple layers, there is a problem that the upper end surface is similarly distorted by the wire of the wire mesh, the rectifying effect at the cooling start position is poor, and cooling spots are generated.

On the other hand, in order not to impair the rectification effect at the upper end surface of the cylindrical metal filter, a seal plate is inserted between the cooling air supply tube of the annular cooling device and the cylindrical metal filter to improve the hermetic sealing performance. An annular cooling device has been proposed (see, for example, Patent Document 3). However, even though the cylindrical metal air filter proposed above is manufactured for the purpose of replacement, cleaning, and reuse when a polymer adheres or is clogged with foreign matter. In addition, since it is a sintered body, the sintering is peeled off from the end face at the time of replacement or cleaning, and the seal plate alone cannot maintain the hermetic sealing property, and the rectifying effect at the cooling start position is impaired. Issues remain.
JP 2006-348457 A JP 2008-115490 A JP-A-2005-42227

  An object of the present invention is to solve the above-mentioned problems, and in a melt spinning apparatus provided with an annular cooling device for cooling a yarn below a melt spinneret for spinning a thermoplastic polymer, the annular cooling device includes a spinning device. It has a heat resistance against temperature, has a rectifying effect in the circumferential direction of the cold air at the cooling start position, and has a ring shape on the upper end surface that can be reused without losing the rectifying effect at the cooling start position even if it is replaced and washed during long-term use An object of the present invention is to provide a melt spinning apparatus including a cylindrical metal air filter to which a reinforcing member is attached.

In order to solve the above problems, the present invention adopts the following configuration. That is,
(1) In a melt spinning apparatus provided with an annular cooling device for cooling a yarn below a melt spinneret, the annular cooling device includes a cylindrical metal air filter having rectification performance, and the cylindrical metal air filter A melt spinning apparatus comprising a ring-shaped reinforcing member on an upper end surface.
(2) The melt spinning apparatus as described in (1) above, wherein a cross-sectional shape in a radial direction of the ring-shaped reinforcing member is a concave shape or an L shape.
(3) The ring-shaped reinforcing member is made of stainless steel, as described in (1) or (2) above.
(4) The melt spinning apparatus according to any one of (1) to (3), wherein a ring-shaped reinforcing member is provided on a lower end surface of the cylindrical metal air filter.

  According to the present invention, the cylindrical air filter and the ring-shaped reinforcing member attached to the upper end surface are made of metal, and thus can be applied at a high spinning temperature. In addition, by attaching a ring-shaped reinforcing member to the upper end surface of the cylindrical metal air filter, the cooling start position important in the cooling of the yarn is uniform in the circumferential direction and the rectification effect is improved, so that cooling spots are suppressed. It is possible. Furthermore, by attaching a ring-shaped reinforcing member, it is possible to prevent peeling of the sintering that occurs during replacement or cleaning, so that the rectifying effect is not impaired, and long-term reuse is possible.

  The present invention is described in further detail below.

The thermoplastic polymer in the present invention is applicable to any polymer that can be melt-spun, such as polyester and polyamide. An example of an embodiment of the melt spinning apparatus referred to in the present invention is shown in FIG. This melt spinning apparatus is provided with an annular cooling device 2 for supplying cold air for cooling and solidifying the yarn Y spun below the melt spinning nozzle 1. Further, the annular cooling device 2 includes a cylindrical metal air filter 3 for rectifying cool air inside. A sealing member 4 is inserted between the annular cooling device 2 and the cylindrical metal air filter 3 in order to improve the hermetic sealing performance. Further, an oil agent applying device 5, a godet roller 11, and a winding device 6 are generally provided below the annular cooling device 2. In the above configuration, the cylindrical metal air filter used in the annular cooling device shown in FIG. 2 satisfies the following conditions.
(1) A ring-shaped reinforcing member is installed on the upper end surface of the cylindrical air filter.
(2) Both the cylindrical air filter and the ring-shaped reinforcing member are made of metal.

  The material of the cylindrical metal air filter 7 and the ring-shaped reinforcing member 8 is not limited, but each member is made of stainless steel that has heat resistance under high temperature spinning, rust prevention, and strength. It is preferable to do. More preferably, it is desirable to select a material suitable for the cleaning method.

  The cylindrical metal air filter may be porous as long as the cold air blown out radially is rectified, and the cylindrical metal air filter is obtained by heat-treating and sintering a wire mesh, a strip-shaped metal tape and metal powder. However, the porous member is not limited to this. Here, the rectification performance of the present invention refers to the uniformity of the cooling air velocity in the circumferential direction in the cylindrical metal air filter. Without straightening performance, uniform cooling between the yarns is not possible, resulting in longitudinal fineness spots.

  The radial cross-sectional shape of the ring-shaped reinforcing member 8 is not particularly limited as long as the cooling start point of the cylindrical metal air filter is uniform in the circumferential direction and improves the rectifying effect. From FIG. 3A, the concave reinforcing member 9 shown in FIG. 3A and the L-shaped reinforcing member 10 shown in FIG. 3B are preferable.

  That is, as shown in FIG. 3A, the concave groove of the concave reinforcing member 9 is attached so as to be fitted into the upper end portion of the cylindrical metal air filter. Further, as shown in FIG. 3B, the L-shaped portion of the L-shaped reinforcing member 10 is attached so as to cover the upper end portion of the cylindrical metal air filter and one side of the outer portion or the inner portion.

  The folding distance L of the reinforcing member to the cylindrical metal air filter is not particularly limited as long as it is uniform in the circumferential direction. However, since it is an important dimension for determining the cooling start position of the yarn, preferably the single yarn fineness is set. It is preferable to select it accordingly. For example, when the single yarn fineness is 1.2 dtex or less, the folding distance L is preferably 3 mm or more and 6 mm or less. When it is less than 3 mm, the durability is slightly inferior, and there is a concern that the reinforcing material may be damaged when used for a long time. On the other hand, if it exceeds 6 mm, it is not cooled from an appropriate cooling start position, so that yarn swaying occurs and the fineness unevenness is somewhat inferior.

  The plate thickness of the reinforcing member is not particularly limited, but it is preferable to reduce the thickness to 0.5 mm or more and 2.0 mm or less in order to worry about durability and contact with the yarn.

  Examples of the method for fixing the reinforcing member to the cylindrical metal air filter include caulking and press-fitting. However, the method is not limited to these and may be removable. In addition, the attachment position of the reinforcing member is not limited to the upper end surface, and is preferably attached to the lower end surface side. If attached to both end faces, the problem of sintering peeling at the time of replacement or cleaning can be prevented at the lower end face side, and the replacement work does not have to consider the directionality of the cylindrical metal air filter.

In the following, the present invention will be described more specifically by taking examples of polyester multifilaments and polyamide multifilaments. Each characteristic value used in the examples was determined by the following measurement method.
[Worcester spots (fineness spots) (U%)]
(1) In the case of polyester multifilament Measured using ZELLWEGER USTER's USTER TESTER UT-4 at a yarn speed of 100 m / min, feed tension of 1/30 g / dtex, S twist, twister rotation speed of 8000 rpm for 5 minutes. Evaluate, U% (H) “less than 0.5” ◎, “0.5 or more and less than 0.8” ○, “0.8 or more and less than 1.2” △, “1.2 or more” X.

(2) Polyamide multifilament Measured using ZELLWEGER USTER's USTER TESTER UT-4 at a yarn speed of 50 m / min, feed tension of 1/30 g / dtex, S twist, twister rotation speed of 8000 rpm for 5 minutes. Evaluate, U% (H) “less than 0.5” ◎, “0.5 or more and less than 1.0” ○, “1.0 or more and less than 1.5” △, “1.5 or more” X.
[Rectification performance]
Using a Kanomax Anemo Master anemometer, measure the degree of variation in wind speed at the 8-periphery position on the outermost circumference of the yarn, and the variation is "less than 5%" or "less than 5% to less than 10%" , “10% or more and less than 15%” is Δ, and “15% or more” is ×.
[Sintering peeling]
The presence or absence was determined visually.

Examples 1-8 and Comparative Examples 1-6
Polyester multifilaments with a fineness of 84 dtex and a filament count of 72 are used for the annular cooling device of the melt spinning apparatus, with unused and replacement-reused products with cylindrical metal elements of different configurations attached and single members and reinforcing members. A polyamide multifilament yarn having a fineness of 78 dtex and 68 filaments was produced. Each polymer was spun under the common conditions of spinning temperature, cold air static pressure, and spinning speed. Further, for each of the examples, a sealing material was inserted between the annular cooling device and the cylindrical metal air filter in order to improve the hermetic sealing performance. The obtained characteristics are shown in Table 1.

  For the above 12 types of melt spinning equipment, woofer spots, circumferential wind speed distribution at the cooling start position, and presence / absence of end face sinter peeling were evaluated. , Δ were considered to be less effective, and × was assumed to be ineffective.

  Examples 1 to 6 are cylindrical metal air filters suitable for the present invention. Regardless of whether they are unused or recycled, there is little variation in the wind speed at the upper end surface of the air filter, and favorable results for Wooster spots are obtained. It was.

  In Example 7, since the folding distance L to the cylindrical metal air filter was increased, the cooling was not performed from the proper cooling start position, and the wind speed variation was good, but the Wooster spots were slightly inferior. .

  In Example 8, the plate thickness of the reinforcing member was slightly increased, but the wind speed variation was small and the Wooster spots were also good.

  In Comparative Example 1, the Wooster spots obtained good results, but the variation in wind speed was inferior because the upper end surface was distorted by the wire of the wire net despite the insertion of the sealing material.

  In Comparative Example 2, the Wooster spots obtained good results, but the variation in wind speed was inferior because the upper end surface was distorted by the strip-shaped ribbon having an unevenness despite the insertion of the sealing material.

  In Comparative Example 3, the Wooster spots obtained good results, but the wind speed variation was inferior because the upper end surface was distorted by the wire of the wire net despite the insertion of the sealing material.

  In Comparative Examples 4 and 5, sintering peeling occurs from the end face portion that occurs in the process of replacement, cleaning and reuse, and Worcester spots and wind speed variation are inferior to Comparative Examples 1 and 2. there were.

  In Comparative Example 6, a protective cover was attached to prevent sintering peeling from the end face only at the time of replacement and cleaning, but the end face was not sufficiently cleaned, and both Wooster spots and wind speed variations were inferior. .

It is the schematic which shows an example of the melt spinning apparatus of this invention. It is the schematic which shows an example of the cylindrical metal air filter of this invention. It is the schematic which shows an example of the cross-sectional shape of the ring-shaped reinforcement member of this invention, (A) shows the example whose cross-sectional shape of radial direction is concave shape, (B) shows the example of L-shape.

Explanation of symbols

1: Spinneret 2: Annular cooling device 3: Cylindrical metal air filter 4: Sealing member 5: Oil application device 6: Winding device 7: Cylindrical metal air filter 8: Ring-shaped reinforcing member 9: Reinforcement of concave shape Member 10: L-shaped reinforcing member 11: Godet roller L: Folding distance Y: Yarn

Claims (4)

In the melt spinning apparatus provided with an annular cooling device for cooling the yarn below the melt spinneret, the annular cooling device includes a cylindrical metal air filter having a rectifying performance, and is provided on an upper end surface of the cylindrical metal air filter. A melt spinning apparatus comprising a ring-shaped reinforcing member. The melt spinning apparatus according to claim 1, wherein a cross-sectional shape in a radial direction of the ring-shaped reinforcing member is a concave shape or an L shape. The melt spinning apparatus according to claim 1 or 2, wherein the ring-shaped reinforcing member is made of stainless steel. The melt spinning apparatus according to any one of claims 1 to 3, wherein a ring-shaped reinforcing member is provided on a lower end surface of the cylindrical metal air filter.

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