WO2005111280A1

WO2005111280A1 - Spinneret for wet-spinning acrylic sheath-core compound fiber

Info

Publication number: WO2005111280A1
Application number: PCT/JP2005/008958
Authority: WO
Inventors: Ryo Ochi; Sadatoshi Nagamine
Original assignee: Mitsubishi Rayon Co., Ltd.
Priority date: 2004-05-19
Filing date: 2005-05-17
Publication date: 2005-11-24
Also published as: JPWO2005111280A1; CN100507097C; CN1926267A; JP4498354B2

Abstract

A spinneret for wet-spinning capable of stably wet-spinning, with high productivity, an acrylic sheath-core compound fiber excellent in the uniformity of a sheath-core compound structure. The spinneret comprises a distribution board distributing core components and sheath components, an upper spinneret board which is partitioned in square blocks in which core component supply holes are arranged parallel with each other in multiple rows, a hole density is 100 to 150 holes/cm2 and the number of holes is 100 to 500/block, a plurality of block comprise the core component supply holes of 5000 to 30,000 in total disposed in vertical and parallel rows, and sheath component supply holes are disposed at the intersections of the partitions of the blocks for the core component supply holes, a lower spinneret board in which composite flow discharge holes are disposed, in the form of blocks, at hole positions corresponding to the core component supply holes of the upper spinneret board and having sheath component in-flow grooves surrounding the blocks of the composite flow discharge holes and sheath component lead-in grooves leading sheath components between composite flow discharge hole rows, and a spacer forming, between the upper spinneret board and the lower spinneret board, a clearance for flowing the sheath components into the composite flow discharge holes.

Description

Aqueous spinneret for acrylic core-sheath composite fiber

Technical field

The present invention relates to an improved wet spinning die used for producing an acrylic core-sheath conjugate fiber.

Background art

[0002] As a core-sheath composite spinneret, a distribution plate that already has a core component distribution hole and a sheath component distribution hole, and a core component that communicates with the sheath component supply hole and the core component distribution hole that communicate with the sheath component distribution hole, are divided. An upper base plate having a large number of core component supply holes arranged in parallel in a plurality of rows to be supplied; and a composite flow discharge hole group having a composite flow discharge hole axially aligned with the core component supply hole of the upper die plate. A lower base plate having a sheath component introduction groove between the composite flow discharge hole rows, and a gap between the upper base plate and the lower base plate to form a sheath component introduction groove force for allowing the sheath component to flow into the composite flow discharge hole. A spinneret configured with a spacer has been proposed (see Patent Document 1). The spinning spinneret, and the pore density 50 Quai ZCM ² or more, intended to enable multi Horui spoon on the spinning hole number 3000 Ke on more than, also the structure of the die, in the making of this spinneret, the publicly known A method (for example, see Patent Document 2) is used, and its manufacture is easy.

[0003] While spinning, this spinneret is used when melt-spinning a core-sheath composite such as polyester fiber or polyamide fiber or when wet spinning an acrylic core-sheath composite fiber having a relatively small number of single fibers. Although there is no particular problem, the spinning speed is slower than the melt spinning, and the number of single fibers is more than 5000. However, when the sheath component is merged around the core component flow from the core component supply hole to form a composite flow, multiple rows of core component supply holes with a significantly large number of holes are arranged in parallel. In this case, it is difficult to uniformly introduce the sheath component into each composite flow discharge hole, and the core-sheath ratio fluctuates or the core portion is eccentric. Core-sheath composite fibers.

Patent Document 1: JP-A-9-21015

Patent Document 2: JP-A-11-350241 Disclosure of the invention

Problems to be solved by the invention

[0004] The present invention is an improvement on the problems in the spinneret described above, and an object of the present invention is to eliminate variations in the core-sheath composite structure between single fibers and improve uniformity of the core-sheath composite structure. Wet spinning of acrylic core-sheath conjugate fiber with excellent productivity, stable and easy to produce, and simple structure, easy to manufacture, and with more than 5,000 spinning holes To provide a base.

Means for solving the problem

[0005] The present invention is a spinneret for wet spinning of acryl core-sheath conjugate fiber in which at least one of the core component and the sheath component is an acrylonitrile polymer, and has a distribution plate having a core component distribution hole and a sheath component distribution hole. The core component supply holes that communicate with the core component distribution holes and supply the core components in a divided manner are arranged in parallel in multiple rows, forming a square block with a hole density of 100 to 150 Zcm ² and a hole count of 100 to 500 Z blocks. A core component supply hole with a total number of 5000 to 30,000 core component supply holes in which a plurality of blocks are arranged in tandem and in parallel, and the sheath component supply hole communicating with the sheath component distribution hole is a block of the core component supply hole. An upper die plate arranged at the intersection and a plurality of blocks are provided with a plurality of blocks having an inlet hole diameter larger than an outlet hole diameter of the core component supply hole at a hole position corresponding to each core component supply hole of the upper die plate. And surrounds a block of complex flow outlets A lower base plate having a component inflow groove and a sheath component introduction groove communicating with the sheath component inflow groove and introducing a sheath component between the composite flow discharge hole rows; an outlet of the core component supply hole of the upper base plate; and a lower base plate. An acrylic core characterized by comprising a spacer that forms a gap for a flow path through which a sheath component flows into the composite flow discharge hole while causing the inlet of the composite flow discharge hole to close. Wet spinneret for sheath composite fibers.

The invention's effect

According to the present invention, the number of single fibers is increased to 5,000 to 30,000 due to the increase in the number of spinning holes, so-called multi-hole fiber, and the number of single fibers is large. Acrylic core-sheath composite fiber with excellent uniformity without variation in core-sheath composite structure can be spun stably and with good productivity, and can cope with a wide range of spinning conditions for various core components and sheath components. Accordingly, it is possible to provide a core-sheath composite spinneret having a high pore density and a large number of holes, which can be easily manufactured and has a simple structure.

Brief Description of Drawings

FIG. 1 is a perspective view (partial sectional view) of a nozzle of a spinneret of the present invention.

FIG. 2 is a partially enlarged sectional view showing a structure of a main part of a spinneret of the present invention.

FIG. 3 is a plan view showing a calculation range of the example and a graph showing the result of the example. Explanation of symbols

[0008] 1 sheath component supply hole

2 Core component supply hole

3 Upper base plate

4 Composite flow outlet

5 Sheath component inflow groove

6 Sheath component introduction groove

7 Lower base plate

8 Spacer

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to the drawings.

The spinneret of the present invention is used when an acrylic core-sheath conjugate fiber is produced by wet spinning. In particular, in the structure of the spinneret, an upper spinneret and a lower spinneret arranged via a spacer. Has structural features. FIG. 1 is a perspective view (partial sectional view) of a nozzle of a spinneret of the present invention, and FIG. 2 is a partially enlarged cross-sectional view showing a structure of a main part of the spinneret of the present invention. In the figure, 1 is a sheath component supply hole, 2 is a core component supply hole, 3 is an upper mouthpiece plate, 4 is a composite flow discharge hole, 5 is a sheath component inflow groove, 6 is a sheath component introduction groove, 7 is a lower mouthpiece plate, 8 indicates a spacer.

[0010] The upper die plate 3 has a core component supply hole 2 for dividing and supplying a core component distributed from the core component distribution holes of the distribution plate laminated on the upper die plate. The core component supply holes are arranged in a plurality of rows in parallel, and the core component supply holes are arranged in parallel to form a substantially rectangular square having a hole density of 100 to 150 Zcm ² and a number of holes of 100 to 500, preferably 100 to 300. To form a block. When a block is formed by arranging core component supply holes in parallel with a plurality of columns, a plurality of arrangements with different numbers of holes are arranged so that the positions of the core component supply holes in adjacent rows are shifted and staggered. It is preferable that the rows are arranged in parallel or the rows having the same number of holes are alternately shifted in position and arranged in parallel in a plurality of rows.

[0011] The upper die plate is provided with 20 to 60, preferably 25 to 40, blocks of core component supply holes in number of blocks, and 5,000 to 30,000, preferably 6,000 to 10,000 in total number of holes. A core component supply hole is provided. The blocks to be arranged are preferably a combination of blocks having the same number of holes, but may be a combination of blocks having different numbers of holes depending on the shape of the die plate, the mounting method, and the like. The number of core component supply holes arranged in parallel in one core component supply hole block is not particularly limited, but the number of core component supply holes in one row should be 10 to 20. Is preferred for forming a uniform core-sheath composite flow. The core component supply hole in the upper die plate has an inlet hole diameter of 300 to 500 111 and an outlet hole diameter of 50 to 90 μm. It is preferable for discharging and supplying as a component stream.

[0012] The blocks of the core component supply holes need to be arranged as evenly as possible on the base plate, and a plurality of blocks are arranged in a row and in parallel so as to be evenly arranged. Further, from the viewpoint of drilling holes, it is preferable that the base plate has a square shape. In addition, the upper base plate 3 has a sheath component supply hole 1 communicating with the sheath component distribution hole at a position corresponding to each corner of the square which is a section intersection of the square block of the core component supply hole. The sheath component supply hole 1 in the upper die plate 3 preferably has a hole diameter of 2.0 to 4.0 mm in order to supply the sheath component uniformly and promptly.

The lower base plate 7 is a base plate having the same shape as the upper base plate superposed on the upper base plate 3 via the spacer 8, and has a hole corresponding to each core component supply hole 2 of the upper base plate 3. At the position, a composite flow discharge hole 4 having an inlet diameter larger than the outlet diameter of the core component supply hole is arranged, and accordingly, the composite flow discharge hole 4 is formed as a plurality of blocks and has a hole density of 100 to 100 corresponding to the core component supply hole. 150 pcs / cm ² , Number of holes 100-500 pcs Z block, preferably 100-300 pcs Z block, total number of holes 5 000-30000 pcs, preferably <600-10 000 pcs. Is a sheath component inflow groove 5 that surrounds each block of composite flow discharge holes on its There is a sheath component introduction groove 6 which communicates with the sheath component inflow groove and introduces the sheath component between the composite flow discharge holes in each block.

[0014] The composite flow discharge hole 4 in the lower die plate 7 is a hole that forms and discharges a composite flow of the core component and the sheath component, and has at least an inlet hole diameter of 300 to 500 / ζπι and an outlet hole diameter of It is preferably 50 to 90 m for discharging as a stable core-sheath composite flow. The sheath component inflow groove 5 surrounding the block of the composite flow discharge hole 4 has a groove width of 2.0 to 5.0 mm, and the composite flow discharge in the block.

The sheath component introduction groove 6 for introducing the sheath component between the outlet rows is preferably 0.3 to 1.0 mm in groove width in order to form a stable core-sheath composite flow. The sheath component introduction groove 6 may be further provided at an appropriate position in the composite flow discharge hole array so as to be orthogonal to the hole array.

In the spinneret shown in FIG. 1, the core component is guided from the core component distribution holes of the distribution plate to the respective core component supply holes 2 arranged as blocks of the core component supply holes of the upper die plate 3, It is supplied from the outlet of the core component supply hole 2 to the inlet of the composite flow discharge hole 4 as a linear discharge flow. The sheath component is supplied from the sheath component distribution hole of the distribution plate to the sheath component inflow groove 5 surrounding the block of the composite flow discharge hole 4 of the lower mouth plate 7 through the sheath component supply hole 1 of the upper mouth plate 3. It is guided from the sheath component inflow groove 5 to the sheath component introduction groove 6 between the composite flow discharge holes in each block, and flows mainly through the sheath component introduction groove 6, and further between the upper base plate 3 and the lower base plate 7. The flow is led to the sandwiching gap to give a pressure loss, so that the flow is rectified and uniformly supplied to each composite flow discharge hole 4. The rectified sheath component flow flows into the composite flow discharge hole 4 while surrounding the core component flow supplied as a discharge flow from the outlet of the core component supply hole 2 while surrounding the core component flow, forming a core-sheath composite flow, and the composite flow is discharged. It is discharged from the outlet of the hole 7. The gap between the upper base plate 3 and the lower base plate 7 is set to an arbitrary width by the spacer 8 and formed.

[0016] The first feature of the present invention is that the core component supply hole and the composite flow discharge hole are provided in the form of a block so that the sheath component is uniformly guided to each composite flow discharge hole where the core component is supplied as a discharge flow. And a uniform core-sheath composite flow can be formed. In order to produce acrylic core-sheath composite fibers with high productivity by wet spinning, it is necessary to increase the number of composite flow discharge holes from which the core-sheath composite flow is discharged. As a result, variations occur between the core-sheath composite flows formed at each composite flow discharge hole, and variations in the core-sheath composite structure between single fibers Easily occur. According to the present invention, by arranging the core component supply holes and the composite flow discharge holes in the form of a block, a uniform core-sheath composite flow is formed and the number of spinning holes is 5,000 to 30 000. Thus, it is possible to carry out multi-hole shaping in a wet core-sheath composite spinneret.

[0017] The second feature of the present invention is that the spinneret is used while the number of core component supply holes provided in the upper base plate and the number of combined flow discharge holes provided in the lower base plate are 5,000 to 30,000, respectively. It is advantageous in that it can be obtained economically. For spinnerets, it is also important that the spinnerets themselves be easy to manufacture and economically inexpensive in order to improve productivity. The spinneret for wet spinning of fibers usually has a relatively low pressure at the time of ejection, so that the ejection plate having a thinner mouthplate can be easily formed. On the other hand, in the spinneret for wet spinning of conjugate fibers, especially core-sheath conjugate fibers, the spinneret of the sheath component is rectified by a large pressure loss when passing through a narrow gap, so the die plate only withstands this pressure. Therefore, the cost of forming the discharge holes increases. Therefore, in the spinneret for the wet spinning of the core-sheath composite fiber, a substantial reduction in the manufacturing cost of the spinneret cannot be expected unless the total number of holes is suppressed.

However, in the spinneret of the present invention, if the upper and lower surfaces of the upper die plate are made flat, only the core component supply hole and the sheath component supply hole are formed, and the lower die plate is formed. If the lower surface is flat, it is manufactured by drilling of composite flow discharge holes, and linear groove cutting of the sheath component inflow groove on the plate surface and the sheath component introduction groove between the composite flow discharge hole rows. . Therefore, especially when the core component supply hole and the composite flow discharge hole have the same shape, one of the two perforated base plates is perforated with the sheath component supply hole, and the upper base plate, On the other hand, it is also possible to produce a lower die plate by subjecting the sheath component inflow groove and the sheath component introduction groove to groove cutting. The production of the die according to the present invention is relatively inexpensive and economical. It is. In the spinneret of the present invention, the upper die plate and the lower die plate can be thinned to about 5 mm each depending on the hole diameter, the number of holes, the supply pressure, the material, and the like. This facilitates not only the light weight of the base but also the cleaning work.

[0019] A third feature of the present invention is that a gap formed between the upper die plate and the lower die plate can be arbitrarily changed by interposing spacers having different thicknesses. In the case of core-sheath composite spinning, the gap between the upper and lower base plates is usually lower because the viscosity of the sheath component is lower. The smaller the viscosity, the higher the viscosity. This interval is set to an optimum value according to various spinning conditions such as the kind and combination of the core component and the sheath component, the concentration, the discharge amount, the discharge amount ratio (core-sheath ratio), and the spinning temperature. In the die of the present invention, the above interval can be easily changed in the range of 30 to 500 / zm simply by replacing a spacer having a thickness of usually 0.03 to 0.5 mm, which can be manufactured at low cost. This makes it possible to handle a wide range of spinning conditions with a single spinneret, which is extremely economical.

[0020] The spinneret of the present invention is used as a spinneret for producing an acrylic core-sheath composite fiber having both or one of a core component and a sheath component as an acrylonitrile polymer by wet spinning. In addition, the spinneret of the present invention can produce an acrylic core-sheath composite fiber having various functions and performances with a high productivity by a combination of a core component and a sheath component. When the core component and the sheath component are acrylonitrile-based polymers, different combinations of physical properties, functions, and the like are used. As the polymer used as the core component or the sheath component other than the acrylonitrile-based polymer, a polymer capable of wet spinning may be used, and examples thereof include a salt-forming butyl polymer and a cellulose-based polymer.

Example

Under the conditions shown in Table 1, the spinning nozzle divided into a square block with 280 holes and a square block with 750 holes and a spinning nozzle divided into a square block with 750 holes Discharge Hole Force The discharge amount distribution of the spun stock solution to be discharged was calculated using the following equation (assuming the discharge amount of the furthest hole from the sheath component supply hole).

The calculation was performed for the range of 1Z4 of one block having one sheath component supply hole (the shaded portion in FIG. 3). The results are shown in FIG. 3, and the CV values are shown in Table 2.

[0022] Circular pipe pressure drop type AP = 128 r? QLZd ⁴

Rectangular flow path pressure loss formula Δ Ρ = 64 η ab x

Parallel disk channel pressure loss formula Δ P = 6 r? QL (r Zr) Z h ³ π

n 2 1

[0023] where

Δ Ρ: Pressure loss (kg / m ³ )

V: viscosity (kg's / m ² )

Q: Discharge rate (m ³ / sec) L: Length (m)

d Bore size (m)

a Long side of rectangle (m)

b Rectangular short side (m)

x

h: Parallel disk distance (m)

r Outside radius of disk (m)

2

r Radius in disk (m)

1

table 1]

* D (C), GH, DD (S), D (S), DL (S), FH, FD, SH, SD, SL and FL in the table indicate the following lengths

[Table 2]

Number of holes per block CV value

Nozzle 1 280 holes 1.1%

Nozzle 2 750 holes 4.3%

[0026] As is clear from the results in Table 2, the spinning nozzle divided into a rectangular block with 280 holes and a Z block and the spinning nozzle divided into a square block with 750 holes and a Z block It can be seen that the former has a smaller discharge variation. This variation in the amount of discharge results in variation in the fineness (thickness) of the formed fiber, and if this variation is large, there is a problem in the feeling and appearance of a fiber product.

Industrial applicability

[0027] The spinneret of the present invention has a spinning hole number of 000 to 30,000, so that the number of single fibers is 5,000 to 30,000 !, the number of single fibers is large, and the acrylic core-sheath composite fiber is wet-spun. When the core component or the sheath component is an atalylonitrile polymer, various polymers or functional polymers are used as the core component or the sheath component. By using the coalesced, the production cost of various types of acrylic core-sheath conjugate fibers that exhibit the unique properties of acrylic fibers that cannot be obtained with melt-spun polyester fibers and polyamide core-sheath conjugate fibers, is raised by wet spinning. It is possible to manufacture without any problems. In particular, when the sheath component is an acrylonitrile-based polymer, it becomes possible to produce an acrylic core-sheath composite fiber provided with various functions by the core component, while maintaining the distinctiveness of acrylic fiber.

Claims

The scope of the claims

An acrylic core-sheath conjugate fiber wet spinneret having at least one of a core component and a sheath component as an acrylonitrile polymer, a distribution plate having a core component distribution hole and a sheath component distribution hole, and a core component distribution hole. division supplies core component supply holes of the core component communicates the hole density 100-150 Ke ZCM ² are arranged in a flat row in a plurality of rows, it is divided into square shaped blocks of the hole number 100-500 Ke Z block, a plurality of blocks Has 5,000 to 30,000 core component supply holes arranged in tandem and in parallel, and the sheath component supply holes communicating with the sheath component distribution holes are arranged at the intersections of the blocks of the core component supply holes. The upper base plate and the inlet hole diameter are larger than the outlet hole diameter of the core component supply hole at the hole position corresponding to each core component supply hole of the upper base plate!ヽ Composite flow discharge holes are arranged as a plurality of blocks, and a sheath component inflow groove surrounding the block of the composite flow discharge holes, and a sheath component communicating with the sheath component inflow groove to introduce a sheath component between the composite flow discharge hole rows. A lower die plate having an introduction groove, a flow path for causing the outlet of the core component supply hole of the upper die plate and the inlet of the composite flow discharge hole of the lower die plate to flow, and for flowing the sheath component into the composite flow discharge hole. And a spacer for forming a gap for the wet spinning of an acrylic core-sheath composite fiber.