JPH06346310A - Spinneret - Google Patents

Abstract

PURPOSE:To provide a spinneret capable of readily and efficiently preparing spinning holes arranged at equal spaces and, in addition, efficiently producing a laminate of fiber bundles having uniform fiber density. CONSTITUTION:This spinneret forms plural spinning holes 4 in a spinneret plate 2 and the plane shape of the spinneret plate 2 is polygon such as quadrilateral. These spinning holes 4 are arranged in zig zag state. In this spinneret 1, positioning and inspection of these spinning holes 4 can readily be carried out. Since polygonal fiber bundle having uniform fiber density is obtained by bundling fibers discharged from the spinneret 1, operability of post processing is improved and, in addition, a fiber product having high quality, e.g. a tobacco filter is obtained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel spinneret used for spinning fibers.

[0002]

2. Description of the Related Art Spinnerets having a plurality of spinning holes are widely used for spinning various fibers. For example, fibers such as cellulose acetate spun from a spinneret are bundled to obtain a fiber bundle, and a plurality of the fiber bundles are laminated to form a plate-shaped fiber bundle laminate, which is then crimped to form a tobacco filter or the like. Fiber bundle products can be manufactured.

Conventionally, a spinneret plate having a plurality of spinning holes has a circular planar shape. When forming a spinning hole in such a spinneret, the spinning hole is usually formed on a concentric circumference. But with this method,
Since the circumferences of the spinning holes are different depending on the radius, it is extremely difficult to form the spinning holes, especially the circumferential holes adjacent to each other at equal intervals. Therefore, it is not possible to easily manufacture a spinneret for obtaining a fiber bundle having a uniform fiber density. Further, since the holes are not arranged on the straight line passing through the center of the circle, the spinning hole arrangement inspection cannot be performed easily and efficiently.

FIG. 4 is a schematic process diagram showing a process for producing a fiber bundle laminate from fibers spun using a conventional spinneret having a circular spinneret. When spinning is performed using a spinneret having a circular spinneret, bundle-shaped fibers 11 having a circular cross section are obtained corresponding to the planar shape of the spinneret. A fiber bundle laminate 13 is obtained by bundling these fibers into a fiber bundle 12 and stacking a plurality of the fibers in the longitudinal and lateral directions. In this case, even if the spinning holes are formed at equal intervals, the fiber bundle 9 has a substantially elliptic cylindrical shape, so that the fiber density at both ends in the major axis direction is lower than that at the center. Moreover, there is a gap between each fiber bundle. Therefore, even if the fiber bundle laminate thus obtained is crimped, a high-performance cigarette filter or the like having a uniform fiber density cannot be obtained. Further, since the fiber bundle has a substantially elliptic cylindrical shape, it easily rolls and is inferior in positioning stability. Therefore, the workability when laminating the fiber bundles or subjecting the obtained laminated body to the post-processing is likely to deteriorate.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a spinneret which can easily and efficiently prepare spinning holes arranged at equal intervals and can easily carry out an alignment inspection of the spinning holes. To provide.

Another object of the present invention is to provide a spinneret capable of obtaining a laminate of fiber bundles having a uniform fiber density and improving the workability of post-processing of spun fibers.

[0007]

Means for Solving the Problems As a result of earnest studies for achieving the above-mentioned object, the present inventor has found that a bundle of fibers corresponds to the planar shape of the die plate, and that the plane shape of the die plate is polygonal. Spin holes can be easily formed in the lengthwise and crosswise directions, thus facilitating alignment inspection and defect inspection of the spinneret, and the fact that the fiber bundle obtained by such a spinneret has edges and is stable and easy to stack. Found out,
The present invention has been completed. That is, the present invention provides a spinneret in which a plurality of spinning holes are formed in a spinneret plate, and the planar shape of the spinneret plate is a polygon.

[0008]

In the spinneret having the above construction, a plurality of spinning holes are formed in the spinneret plate, so that a bundle of fibers can be obtained by spinning.

Further, in this spinneret, the plane shape of the spinneret plate is polygonal, so that spinning holes can be formed in the longitudinal and transverse directions of the spinneret plate. Therefore, it is possible to easily and efficiently perforate the spinneret plate at equal intervals. Therefore, it is relatively easy to judge whether or not the positions of the holes are accurate in the inspection of the arrangement of the spinning holes. In addition, for example, when performing defect inspection of the spinning hole after use or after washing,
The spinning holes can be easily positioned, and the presence or absence of defects such as clogging of the spinning holes can be easily inspected.

Further, when fibers spun from the spinneret are bundled to obtain a fiber bundle and a plurality of the fiber bundles are laminated to form a plate-shaped fiber bundle laminate, the fiber bundle is not curved but flat. Since it can be formed, stability is increased and a gap is less likely to occur between each fiber bundle.

Therefore, a fiber bundle laminate having a uniform fiber density can be obtained, and the working efficiency is significantly improved.

In particular, when the die plate has a quadrangular planar shape, the stability of the obtained fiber bundle and the workability in stacking are greatly improved.

Further, in the spinneret in which the spinning holes are arranged in a staggered manner, the positioning of the spinning holes is easy, and the spinning holes are regularly arranged, so that the spinning hole arrangement inspection can be easily performed. .

[0014]

EXAMPLES The spinneret of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the spinneret of the present invention. FIG. 2 is a partially cutaway schematic plan view showing a spinneret plate of the spinneret shown in FIG. 1. FIG. 3 is a schematic process drawing showing a process for producing a fiber bundle laminate from fibers spun using the spinneret of FIG. 1.

The spinneret 1 shown in FIG. 1 is in the shape of a box, has a square planar shape, and has a spinneret plate 2 in which a large number of spinnerets 4 are formed, and a spinneret plate 2 formed on the periphery of the spinneret plate 2. It is composed of the side wall 3.

Since the planar shape of the die plate 2 is square,
The spinning holes can be easily formed at equal intervals in the vertical and horizontal directions.

The size of the spinneret plate 2 is appropriately determined within a range in which spinning is smoothly performed, and the length of one side is, for example, 10
It is about 500 mm and the thickness is about 0.2 to 15 mm.
The height of the side wall 3 is, for example, about 5 to 100 mm. In addition, a flange may be formed on the upper end of the side wall 3 for connection with a pipe or the like.

In this example, the spinning holes 4 are arranged in a staggered shape. Further, three adjacent spinning holes are formed so as to be located at the vertices of an equilateral triangle.
Therefore, the number of holes in the vertical and horizontal directions is substantially the same, the positioning of the spinning holes is easy, and the spinning holes can be efficiently drilled. Also, because the arrangement of spinning holes is regular,
It is possible to easily inspect whether the positions of the holes are accurate. Further, when spun, a bundle of fibers having a uniform fiber density can be obtained.

The number of spinning holes 5 can be appropriately selected depending on the type of fiber and the application, but is, for example, 0.04 to 2000 / c.
m ² , preferably about ² to 200 pieces / cm ² .

The spinning hole 4 is usually composed of an introducing section for introducing the spinning solution and an ejecting section for ejecting fibers which is formed below the introducing section. Examples of the shape of the introduction portion include an inverted truncated cone shape such as an inverted truncated cone shape. The shape of the discharge part can be appropriately selected according to the type and use of the fiber, and for example, a columnar shape;
Examples thereof include polygonal prisms such as triangular prisms, quadrangular prisms, and pentagonal prisms, and other columnar columns having irregular cross sections.

The length of the introduction portion is, for example, 0.1-10.
mm, the length of the discharge unit is, for example, 0.001 to 1
It is about mm. The length of the introduction portion is, for example, 80 to 99.9%, preferably 9 to the thickness of the die plate.
The length of the discharge portion is, for example, 0.1 to 20%, preferably 1 to 10% of the thickness of the die plate.
%. The opening diameter of the introduction portion is, for example, 0.1 to
About 10 mm, the hole diameter on the discharge part side is, for example, 0.005 to
It is about 2 mm. Also, the hole diameter on the discharge part side of the introduction part is
It is, for example, about 0.5 to 50%, preferably about 1 to 10% with respect to the opening diameter of the introduction portion. The hole diameter of the discharge part is, for example, about 0.005 to 2 mm.

The spinning holes are, for example, punched,
Drilling can be performed by cutting with a drill or the like, laser processing, or a combination thereof.

The spinneret of the present invention can be used in any spinning method such as a wet spinning method, a dry spinning method and a melt spinning method. A fiber bundle is obtained by introducing the spinning solution into the introducing portion of the spinneret and spinning from the discharging portion. Examples of the fibers include cellulose acetate, polyacrylonitrile, polyurethane, polyvinyl chloride, viscose rayon, nylon and polyester.

When spinning is performed using this spinneret, bundle-like fibers 5 having substantially the same number of strands in the longitudinal and transverse directions are obtained. When bundled, the fiber bundles 6 are substantially rectangular parallelepiped corresponding to the plane shape of the spinneret plate. Is obtained. The fiber bundle laminated body 7 can be obtained by laminating, for example, 16 bundles of the obtained fiber bundles 6.
Further, by stacking a plurality of fiber bundles 6, it is possible to obtain fiber bundle laminated bodies 8 to 10. Since the fiber bundle 6 is a substantially rectangular parallelepiped, the density of the fibers in the fiber bundle 6 is high, and the work efficiency in stacking is also improved. Moreover, a gap is unlikely to occur between the laminated fiber bundles. Therefore, by subjecting the fiber bundle laminate to a subsequent step such as crimping,
For example, a fiber product such as a high-quality tobacco filter having a uniform fiber density can be efficiently manufactured.

The planar shape of the die plate 2 may be a quadrangle such as a rectangle or a parallelogram; any polygon such as a triangle, a pentagon, a hexagon, and an octagon. Preferred planar shapes include tri- to hexagons. From the viewpoint of stability and laminating workability of the obtained fiber bundle, in particular, as the planar shape,
Squares, especially squares or rectangles, are often used.

The arrangement of the spinning holes is preferably such that adjacent spinning holes are substantially equidistant from each other. In addition to the zigzag shape described above, a preferable arrangement includes a lattice shape and the like. A particularly preferable arrangement is a staggered shape. Among them, a zigzag array in which the spinning holes adjacent to each other are formed at the vertices of a regular triangle or a regular quadrangle, particularly the vertices of a regular triangle is preferable.

[0028]

According to the spinneret of the present invention, spinning holes arranged at equal intervals can be easily and efficiently prepared, and
The arrangement inspection of the spinning holes and the defect inspection after use or after cleaning can be easily performed. Further, according to the present invention, a laminated body of fiber bundles having a uniform fiber density can be obtained, and the work efficiency of post-processing of spun fibers can be improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a spinneret of the present invention.

2 is a partially cutaway schematic plan view showing a spinneret plate of the spinneret of FIG. 1. FIG.

FIG. 3 is a schematic process drawing showing a process for producing a fiber bundle laminate from fibers spun using the spinneret of FIG.

FIG. 4 is a schematic process drawing showing a process for producing a fiber bundle laminate from fibers spun using a conventional spinneret.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spinneret 2 ... Spindle plate 3 ... Side wall 4 ... Spinning hole 5, 11 ... Spinning fiber 6, 12 ... Fiber bundle 7, 8, 9, 10, 13 ... Fiber bundle laminated body

Claims (3)

[Claims] 1. A spinneret in which a plurality of spinning holes are formed in a spinneret plate, wherein the spinneret plate has a polygonal planar shape. 2. The spinneret according to claim 1, wherein the plane shape of the spinneret plate is a quadrangle. 3. The spinneret according to claim 1, wherein the spinning holes are arranged in a staggered pattern.