JP2010174406A - Spinneret for sea-island type conjugated fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spinneret for sea-island type conjugated fibers in which the high-quality sea-island type conjugated fibers can efficiently be formed. <P>SOLUTION: The spinneret 1 for forming the sea-island type conjugated fibers from a sea component and an island component is provided. The spinneret includes: a sea component flow body 13 having a plurality of sea component flow holes 32 formed so as to extend in the vertical direction; a sea component introduction part 30 for introducing the sea component into the sea component flow holes 32; a plurality of island component flow pipes 33 inserted into the plurality of sea component flow holes 32, respectively, and extending along the vertical direction; island component introduction parts 31 for introducing the island component into the island component flow pipes 33; and conjugated fiber collecting parts 40 for collecting the conjugated fibers under the sea component flow holes 32 and island component flow pipes 33. The plurality of sea component flow holes 32 are formed so as to be distributed in any on circumferences of a plurality of concentric circles, and composed of the outermost sea component flow holes 321 disposed on the outermost circle on the farthest outside in the dimensional direction in the concentric circles and the inside sea component flow holes 322 disposed on the circles on the inside of the outermost circle. In the spinneret 1, the cross-sectional area of the outermost sea component flow holes 321 is larger than that of the inside sea component flow holes 322. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a die for a sea-island type composite fiber that forms a sea-island type composite fiber from a sea component and an island component.

  Conventionally, a sea-island type composite fiber base as shown in FIG. 14 has been known as a sea-island type composite fiber base that forms sea-island type composite fibers from sea components and island components (see, for example, Patent Document 1).

  As shown in FIG. 14, a conventional sea island type composite fiber base (hereinafter referred to as “base”) 100 includes a sea component circulation body 102 having a plurality of sea component circulation holes 101 and a plurality of sea component circulation holes 101. And a sea component introduction unit 103 for introducing a sea component. The plurality of sea component circulation holes 101 are formed to extend in the vertical direction. The base 100 includes an island component circulation pipe 104 inserted into each of the plurality of sea component circulation holes 101, and an island component introduction portion 105 that introduces the island component into the plurality of island component circulation pipes 104. The island component circulation pipe 104 extends along the vertical direction. In addition, the base 100 includes a composite fiber collecting unit 106 disposed below the sea component circulation hole 101 and the island component circulation pipe 104. The composite fiber collection unit 106 is configured such that a plurality of core-sheath composite fibers composed of sea components and island components join together.

  According to the base 100 having such a configuration, first, a sea component in a molten state is supplied from a sea component supply source (not shown) to the sea component introduction unit 103. In addition, an island component in a molten state is supplied to the island component introduction unit 105 from an island component supply source (not shown). Thereafter, the sea component in the sea component introduction unit 103 and the island component in the island component introduction unit 105 are introduced into the sea component circulation hole 101 and the island component circulation pipe 104, respectively. The introduced sea component and island component merge after passing through the sea component circulation hole 101 and the island component circulation pipe 104, respectively, thereby forming a plurality of core-sheath type composite fibers from the sea component and the island component. The plurality of core-sheath type composite fibers are collected by the composite fiber collection unit 106 into a bundle, thereby forming a sea-island type composite fiber.

  Thereafter, the sea-island type composite fiber is treated with an alkaline aqueous solution (alkali weight loss) to remove the sea component and extract only the island component fiber.

JP-A-56-148906

  In such a base 100, sea components are finally removed by alkali weight reduction. Therefore, in order to efficiently extract island component fibers, it is preferable to reduce sea components. However, if the amount of the sea component introduced into the sea component circulation hole 101 is too small, the island component cannot be sufficiently covered with the sea component. As a result, the sea component is peeled off and the island components are melted. I sometimes wore it. Such fusion between the island components is particularly caused when the sea-island composite fibers flow through the composite fiber collecting unit 106, and the sea components of the sea-island composite fibers and the inner surface of the composite fiber collecting unit 106 are rubbed together. Was caused by peeling from the island components. In particular, when the amount of the sea component is small, such fusion mainly occurs in the island component that has passed through the outermost island component circulation pipe 104 among the plurality of island component circulation pipes 104. Thereby, there existed a problem that a high quality sea-island type composite fiber could not be obtained.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cap for a sea-island type composite fiber that can efficiently form a high-quality sea-island type composite fiber.

  A base for a sea-island type composite fiber according to the present invention is made in order to solve the above problems, and is a base for a sea-island type composite fiber that forms a sea-island type composite fiber from a sea component and an island component, A sea component circulation body having a plurality of sea component circulation holes formed to extend in a direction, a sea component introduction part for introducing a sea component into the plurality of sea component circulation holes, and a plurality of the sea component circulation holes, respectively. A plurality of island component circulation pipes inserted and extending along the vertical direction, an island component introduction part for introducing island components into the plurality of island component circulation pipes, and below the sea component circulation holes and the island component circulation pipes A composite fiber collecting section for collecting composite fibers composed of sea components and island components, wherein the plurality of sea component circulation holes are formed so as to be distributed to any one of a plurality of concentric circles. The most radial direction of the concentric circles An outermost sea component circulation hole disposed on the outermost circle on the side, and an inner sea component circulation hole disposed on a circle inside the outermost circle. The area is larger than the cross-sectional area of the inner sea component circulation hole.

  According to such a configuration, since the cross-sectional area of the outermost sea component circulation hole is larger than the cross-sectional area of the inner sea component circulation hole, the flow rate of the sea component introduced into the outermost sea component circulation hole is changed to the inner sea component circulation hole. The flow rate of the sea component to be introduced can be increased. Thereby, in the outermost sea component circulation hole, the sea component covering the island component can be thickened.

  Usually, in a sea-island type composite fiber base, when the sea-island type composite fiber passes through the composite fiber collection part, the inner surface of the composite fiber collection part and the sea component of the sea-island type composite fiber come into contact with each other, thereby shearing (shearing) As a result, sea components will decrease. That is, when the sea component comes into contact with the composite fiber collecting part, the sea component gradually disappears by rubbing against the inner surface of the composite fiber collecting part.

  However, according to the present invention, it is possible to increase the thickness of the sea component in the outermost sea component circulation hole and make it thick, so even if the sea component is reduced due to friction between the sea component and the composite fiber collecting part, It can be prevented from disappearing completely. Therefore, the island component can be reliably covered with the sea component in the process in which the sea-island type composite fiber flows through the composite fiber collecting portion. Thereby, it can prevent that island components fuse | melt together and can form a high-quality sea-island type composite fiber efficiently.

  Moreover, in said structure, ratio of the cross-sectional area of the said outermost sea component circulation hole and the cross-sectional area of the said inner sea component circulation hole can be 1.2: 1-3.0: 1. According to such a structure, it can prevent that a sea component lose | disappears by friction with a composite fiber collection part. Moreover, a sea component can be reliably supplied to an inner sea component circulation hole.

  According to the cap for sea-island type composite fibers of the present invention, high-quality sea-island type composite fibers can be formed efficiently.

It is sectional drawing which shows schematic structure of the die for sea-island type composite fibers which concerns on one Embodiment of this invention. It is a top view of an upper board. It is a bottom view of an upper board. It is sectional drawing which expands and shows a part of upper board. It is XX sectional drawing in FIG. It is a top view of an intermediate plate. It is a top view which expands and shows a part of intermediate plate. It is sectional drawing which expands and shows the other part of an intermediate | middle board. It is sectional drawing which expands and shows another part of intermediate | middle board. FIG. 10 is a YY sectional view in FIG. 9. It is a top view of a lower plate. It is a microscope picture of the fiber of the island component extracted from the sea-island type composite fiber. It is a microscope picture of the fiber of the island component extracted from the sea-island type composite fiber. It is sectional drawing which shows schematic structure of the nozzle | cap | die for conventional sea-island type composite fibers.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a cap for a sea-island type composite fiber according to an embodiment of the present invention.

  A sea island type composite fiber base (hereinafter referred to as “base”) 1 forms a sea island type composite fiber from a sea component and an island component. As shown in FIG. 1, an upper plate 12, an intermediate plate 13, and The lower plate 14 is provided. These plates (12 to 14) are arranged horizontally, are stacked in this order from above, and are in close contact with each other by being connected by bolts 4.

  As the sea component material, known materials can be used. For example, copolymerized polyethylene terephthalate, polyamide, polystyrene and copolymers thereof, polyethylene, polyvinyl alcohol, etc. can be melt-molded and dissolved or extracted or divided after spinning. Examples of such polymers.

  Moreover, as a material of an island component, a well-known thing can be used, for example, polyethylene terephthalate and its copolymer, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polypropylene, polyolefin, polycarbonate, polyacrylate, Polymers that can be melt-molded such as polyamide and polylactic acid are exemplified.

  As materials of the upper plate 12, the intermediate plate 13, and the lower plate 14, for example, various stainless steels such as SUS316 and 630, iron, titanium, ceramic, gold, platinum, and the like can be used. Two or more kinds of materials may be used in combination.

  FIG. 2 is a top view of the upper plate. As shown in FIGS. 1 and 2, the upper plate 12 is formed in a disc shape, and includes a plurality of island component introduction paths 31 and first sea component introduction paths 29 formed by cutting out the upper surface. Yes. The plurality of island component introduction paths 31 and the first sea component introduction paths 29 are each formed in a groove shape and extend along the circumferential direction of the upper plate 12. The plurality of island component introduction paths 31 and the first sea component introduction paths 29 are arranged so as to draw concentric circles.

  The island component introduction path 31 is connected to an island component supply path (not shown), and the island component in a molten state is supplied to the island component introduction path 31 from the island component supply path. The first sea component introduction path 29 is connected to a sea component supply path (not shown), and the sea component in a molten state is supplied from the sea component supply path to the first sea component introduction path 29. Yes. The configuration of the island component supply path and the sea component supply path is not particularly limited. For example, a plate-shaped member (not shown) is further stacked on the upper plate 12 and the island-shaped component supply path and the sea are cut off. A component supply path can be formed.

  FIG. 3 is a bottom view of the upper plate. As shown in FIGS. 1 and 3, the upper plate 12 includes a second sea component introduction path 30 formed by cutting out the lower surface. The second sea component introduction path 30 is formed in a groove shape and extends along the circumferential direction of the upper plate 12.

  As shown in FIGS. 2 and 3, the upper plate 12 is provided with a plurality of flow pipe groups 36. The plurality of flow pipe groups 36 are arranged so as to be distributed on the circumference of a concentric circle. In this embodiment, 36 flow pipe groups 36 are arranged so as to be distributed. FIG. 4 is an enlarged cross-sectional view showing a part of the upper plate. As shown in FIG. 4, one distribution pipe group 36 includes a plurality of island component distribution pipes 33 formed to extend in the vertical direction. The upper part of the island component circulation pipe 33 is inserted into the upper plate 12, and the lower part protrudes downward from the lower end of the upper plate 12. The island component distribution pipe 33 passes through the second sea component introduction path 30. The island component distribution pipe 33 is connected to the lower end of the island component introduction path 31 so that the interior communicates with the island component introduction path 31. FIG. 5 is a sectional view taken along line XX in FIG. As shown in FIG. 5, the plurality of island component distribution pipes 33 in one distribution pipe group 36 are arranged so as to be distributed on the circumference of a plurality of concentric circles and at the center of the concentric circles. In the present embodiment, the 37 island component circulation pipes 33 are arranged so as to be distributed on the circumference of the three concentric circles c1, c2, and c3 and in the central portion c0 of the concentric circles.

  Further, as shown in FIG. 4, the upper plate 12 includes a plurality of sea component introduction holes 24 formed so as to extend in the vertical direction. The sea component introduction hole 24 penetrates the upper plate 12 in the thickness direction, and communicates with the first sea component introduction path 29 and the second sea component introduction path 30.

  FIG. 6 is a top view of the intermediate plate. As shown in FIGS. 1 and 6, the intermediate plate (sea component circulation body) 13 is formed in a disk shape and includes a plurality of flow hole groups 35. The plurality of flow hole groups 35 are arranged so as to be distributed on the circumference of a concentric circle. In this embodiment, 36 flow hole groups 35 are distributed. The plurality of flow hole groups 35 are arranged so as to respectively correspond to the plurality of flow pipe groups 36 in the upper plate 12.

  FIG. 7 is an enlarged sectional view showing a part of the intermediate plate. As shown in FIG. 7, the circulation hole group 35 is composed of a plurality of sea component circulation holes 32 formed to extend in the vertical direction. The sea component circulation hole 32 penetrates the intermediate plate 13 in the thickness direction. 8 is a cross-sectional view taken along the line YY in FIG. As shown in FIG. 8, the plurality of sea component circulation holes 32 in one circulation hole group 35 are arranged so as to be distributed on one of the circumferences of the plurality of concentric circles and at the center of the concentric circles. In the present embodiment, the 37 sea component circulation holes 32 are arranged so as to be distributed on the circumference of the three concentric circles c1, c2, and c3 and in the central portion c0 of the concentric circles. The plurality of sea component circulation holes 32 include an outermost sea component circulation hole 321 disposed on an outermost circle on the outermost radial direction in a plurality of concentric circles, and an inner sea disposed on a circle located inside the outermost circle. It is composed of component flow holes 322. Further, the inner sea component circulation hole 322 is also arranged at the center of a plurality of concentric circles. In the present embodiment, the plurality of sea component circulation holes 32 are the outermost sea component circulation holes 321 arranged on the outermost circle c3 among the three concentric circles, and the circles c1 and c2 located on the inner side of c3. And an inner sea component circulation hole 322 disposed on the central part c0 of the concentric circle.

  FIG. 9 is a cross-sectional view showing a part of the upper plate and the intermediate plate further enlarged. In FIG. 9, the island component circulation pipe 33 and the sea component circulation hole 32 are particularly enlarged to make each component easy to see. As shown in FIG. 9, the plurality of island component circulation pipes 33 are inserted into the plurality of sea component circulation holes 32, respectively. The island component circulation pipe 33 and the sea component circulation hole 32 are arranged so that the height positions of the lower ends thereof coincide with each other. Further, the sea component circulation hole 32 communicates with the second sea component introduction path 30. 10 is a ZZ cross-sectional view in FIG. In FIG. 10, the island component distribution pipe 33 is omitted in order to make each component easy to see. As shown in FIG. 10, the cross-sectional area S <b> 1 of the outermost sea component circulation hole 321 is larger than the cross-sectional area S <b> 2 of the inner sea component circulation hole 322. The cross-sectional area of the sea component circulation hole 32 is configured such that the cross-sectional area S1 of the outermost sea component circulation hole 321 is larger than the cross-sectional area S2 of the inner sea component circulation hole 322 in any axial direction (vertical direction). Yes. The cross-sectional area of the sea component circulation hole is an area of a cross section formed when the sea component circulation hole 32 extending along the vertical direction is cut in the horizontal direction. Here, if the cross-sectional area S1 of the outermost sea component circulation hole 321 is too small, the sea component disappears due to the friction between the sea component that has passed through the outermost sea component circulation hole 321 and the composite fiber collecting unit 40 described later. The island component cannot be covered by the sea component, and the island components are fused. On the other hand, if the cross-sectional area S1 of the outermost sea component circulation hole 321 is too large, the amount of the sea component introduced into the outermost sea component circulation hole 321 becomes excessive, and sufficient sea components are introduced into the inner sea component circulation hole 322. Can not do. Therefore, the ratio of the cross-sectional area S1 of the outermost sea component circulation hole 321 and the cross-sectional area S2 of the inner sea component circulation hole 322 is preferably 1.2: 1 to 3.0: 1.

  FIG. 11 is a top view of the lower plate. As shown in FIG.1 and FIG.11, the lower board 14 is formed in disk shape, and is provided with multiple composite fiber collection parts 40 formed by notching the upper surface. The composite fiber collecting unit 40 is formed in a funnel shape so as to reduce the diameter downward, and is configured to join and bundle a plurality of core-sheath type composite fibers flowing into the inside. The lower plate 14 includes a plurality of composite fiber circulation holes 41 formed to extend in the vertical direction and a plurality of composite fiber outlets 42 communicating with the composite fiber circulation holes 41. The conjugate fiber circulation hole 41 is connected to the conjugate fiber collecting unit 40, and the sea-island type conjugate fiber circulates inside. The composite fiber outlet 42 is formed in a funnel shape so that the diameter decreases downward, and opens downward so that the sea-island type composite fiber flows out to the outside.

  Next, a method for forming a sea-island type composite fiber with the base 1 having the above-described configuration will be described.

  First, a molten sea component is supplied from a sea component supply path (not shown) to the first sea component introduction path 29, and a molten island component is supplied to an island component introduction path 31 from an island component supply path (not shown). Here, if the flow rate of the sea component to be supplied is larger than the island component, the portion to be removed when the island component fibers are finally extracted increases, which is not efficient. On the other hand, when the flow rate of the sea component is small, the island component cannot be sufficiently covered with the sea component. Therefore, the flow rate of the sea component is preferably 5% to 20% of the total flow rate of both the sea component and the island component. On the other hand, the flow rate of the island component is preferably 80% to 95% of the total flow rate of both the sea component and the island component.

  The sea component supplied to the first sea component introduction path 29 is distributed in the circumferential direction of the upper plate 12 by spreading over the entire first sea component introduction path 29. The sea component passes through the sea component introduction hole 24 and is filled into the second sea component introduction path 30. On the other hand, the island component supplied to the island component introduction path 31 is distributed in the circumferential direction of the upper plate 12 by spreading over the entire island component introduction path 31.

Thereafter, the sea component flows into the sea component circulation hole 32 from the second sea component introduction path 30. Further, the island component flows from the island component introduction path 31 into the island component distribution pipe 33. And the sea component and island component which passed the sea component circulation hole 32 and the island component distribution pipe 33 merge, and an island component is coat | covered with a sea component by merge, and a core-sheath- type composite fiber is formed.

  The formed core-sheath type composite fiber flows into the composite fiber collection unit 40, and a plurality of core-sheath type composite fibers are bundled to form a sea-island type composite fiber. Thereafter, the sea-island type composite fiber is taken out from the composite fiber outlet 42. Thus, a plurality of sea-island type composite fibers are completed.

  After the sea-island type composite fiber is completed, island-component fibers are extracted from the sea-island type composite fiber by known alkali weight loss. That is, the sea component is removed from the sea-island type composite fiber with an alkaline aqueous solution, and only the fiber of the island component is extracted.

  According to the base 1 according to the present embodiment as described above, the outermost sea component circulation holes 321 in which the plurality of sea component circulation holes 32 are disposed on the outermost circle on the outermost radial direction in the plurality of concentric circles, and the outermost The outer sea component circulation hole 322 is arranged on a circle inside the circle, and the outermost sea component circulation hole 321 has a larger cross-sectional area than the inner sea component circulation hole 322. The flow rate of the sea component introduced into the hole 321 can be made larger than the flow rate of the sea component introduced into the inner sea component circulation hole 322. Thereby, in the outermost sea component circulation hole 321, the sea component covering the island component can be thickened.

  Usually, in the sea-island type composite fiber base, when the sea-island type composite fiber passes through the composite fiber collection unit 40, the inner surface of the composite fiber collection unit 40 and the sea component of the sea-island type composite fiber come into contact with each other. Sea component decreases due to shear. That is, when the sea component comes into contact with the composite fiber collection unit 40, the sea component gradually disappears by rubbing against the inner surface of the composite fiber collection unit 40.

  However, according to the present invention, the thickness of the sea component in the outermost sea component circulation hole 321 can be increased to increase the thickness, so that even if the sea component is reduced, it is prevented from disappearing completely. Can do. Therefore, the island component can be reliably covered with the sea component in the process in which the sea-island type composite fiber flows through the composite fiber collecting unit 40. Thereby, it can prevent that island components fuse | melt together and can form a high-quality sea-island type composite fiber efficiently.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said embodiment.

  For example, in the present embodiment, the sea component introduction passages 29 and 30 and the sea component introduction hole 24 constitute a sea component introduction part that introduces the sea component into the sea component circulation hole 32. A structure will not be specifically limited if a sea component can be introduce | transduced into the sea component circulation hole 32, A various structure can be used.

  Similarly, the island component introduction section 31 is configured by the island component introduction path 31 for the island component. The configuration of the island component introduction section is particularly suitable if the island component can be introduced into the island component distribution pipe 33. Without being limited, various configurations can be used.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to this embodiment.
[Example 1]
As Example 1, a sea-island type composite fiber was produced using the die 1 of the present invention shown in FIG. On the other hand, as Comparative Example 1, a sea-island type composite fiber was manufactured using a conventional base 100 shown in FIG. Further, after the production of the sea-island type composite fiber, the island component fiber was extracted from the sea-island type composite fiber by alkali weight loss.

  In the production of the sea-island type composite fiber, the sea component was copolymerized polyethylene terephthalate in both Example 1 and Comparative Example 1. The island component was polyethylene terephthalate in both Example 1 and Comparative Example 1.

  In Example 1, among the sea component circulation holes 32, the diameter of the outermost sea component circulation hole 321 was 0.75 mm, and the diameter of the inner sea component circulation hole 322 was 0.70 mm. The ratio of the cross-sectional area S1 of the outermost sea component circulation hole 321 and the cross-sectional area S2 of the inner sea component circulation hole 322 was 1.4: 1.0. On the other hand, in Comparative Example 1, the diameter of the sea component circulation hole 101 was 0.73 mm. The sea-island type composite fiber produced was 4.8 de (denier).

FIG. 12 is a photomicrograph of island component fibers extracted from sea-island type composite fibers. In FIG. 12, (a) is a photomicrograph of Example 1, and (b) is a photomicrograph of Comparative Example 1. As shown in FIG. 12, in Example 1, almost all island components were separated in the extracted island component fibers. On the other hand, in Comparative Example 1, as shown by arrows in the drawing, some island components were bonded together by fusion. Thereby, according to Example 1, it was confirmed that the island components can be prevented from being fused with each other, and high-quality sea-island type composite fibers can be efficiently formed.
[Example 2]
In Example 2 and Comparative Example 2, both island components were nylon (registered trademark).
Others produced sea-island type composite fibers under the same conditions as in Example 1 and Comparative Example 1 described above.

  FIG. 13 is a photomicrograph of fibers of island components extracted from sea-island type composite fibers. In FIG. 13, (a) is a photomicrograph of Example 2, and (b) is a photomicrograph of Comparative Example 2. As shown in FIG. 13, in Example 2, almost all island components were separated in the extracted island component fibers. On the other hand, in Comparative Example 2, as shown by arrows in the figure, some island components were bonded together by fusion.

DESCRIPTION OF SYMBOLS 1 Sea-island type composite fiber base 2 Sea component supply path 3 Island component supply path 4 Fixture 12 Upper plate 13 Intermediate plate 14 Lower plate 30 2nd sea component introduction path 31 Island component introduction path 32 Sea component distribution hole 33 Island component circulation Tube 40 Composite fiber collector

Claims (2)

A sea-island type composite fiber base that forms a sea-island type composite fiber from sea and island components,
A sea component circulation body having a plurality of sea component circulation holes formed to extend in the vertical direction;
A sea component introduction part for introducing a sea component into the plurality of sea component circulation holes;
A plurality of island component circulation pipes inserted respectively into the plurality of sea component circulation holes and extending along the vertical direction;
An island component introduction section for introducing island components into the plurality of island component distribution pipes;
Under the sea component circulation hole and the island component circulation pipe, a composite fiber collecting unit that collects the composite fiber composed of the sea component and the island component, and
The plurality of sea component circulation holes are formed so as to be distributed to any one of the circumferences of a plurality of concentric circles, and are arranged on the outermost circle on the outermost radial direction in the concentric circles. A hole and an inner sea component circulation hole arranged on a circle inside the outermost circle,
A sea island type composite fiber die having a cross-sectional area of the outermost sea component circulation hole larger than a cross-sectional area of the inner sea component circulation hole.   The ratio of the cross-sectional area of the outermost sea component circulation hole to the cross-sectional area of the inner sea component circulation hole is 1.2: 1 to 3.0: 1. .