JPH0364523A - Spinneret for carbon yarn - Google Patents

Abstract

PURPOSE:To obtain the title readily producible spinneret not generating empty holes on the section of product, not requiring concentric insertion of drill and screw into a delivery hole by engaging an induction element containing plural raw solution induction holes and radiated grooves with a main body of spinneret having the delivery holes. CONSTITUTION:An induction element 14 wherein grooves 19 are radiately arranged at the tip surface of a top projecting part 17 and plural raw solution induction holes 18 are arranged in the peripheral direction through is engaged with an induction element fixing hole 11 of a spinneret 13 having a funnel- shaped raw solution delivery holes to give the objective spinneret.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to carbon fiber spinnerets.

(Prior Art) Conventionally, in order to spin carbon fiber, a spinneret 4 with a drill 3 inserted into an extremely small diameter stock solution discharge hole 2 at the bottom of the spinneret body 1 as shown in FIG. 6 or a drill as shown in FIG. Instead of 3, a cap 6 into which a screw 5 is inserted is used.

(Problems to be Solved by the Invention) However, in the carbon fiber spinnerets 4 and 6 described above, it is difficult to insert the drill 3 and the screw 5 into the stock solution discharge hole 2, and therefore it is difficult to insert the drill 3 and the screw 5 into the stock solution discharge hole 2. It was difficult to hold it concentrically and stably within the hole 2.

In addition, when pitch is spun using the carbon fiber spinnerets 4 and 6, voids are generated in the cross section of the resulting pitch, and the cross-sectional orientation is parallel to the fiber axis, so that the fired and graphitized fibers are not sufficient. It was not possible to obtain suitable strength and elastic modulus.

Therefore, the present invention has developed a carbon fiber that can be easily produced without inserting a drill or screw into the stock solution discharge hole, and can be spun with a pitch so that no holes are generated in the cross section and the cross-sectional orientation is random. The present invention seeks to provide a fiber spinneret.

(Means for Solving the Problems) A carbon fiber spinneret of the present invention for solving the above-mentioned problems has a large-diameter tapped hole in the upper part to which a stock solution supply pipe is connected, and the tapped hole in the middle. followed by a cap body having a concentric bottomed small-diameter introducer fitting hole, and a base having an extremely small diameter stock solution discharge hole following the introducer fitting hole at the bottom; and an introducer of the cap body. It consists of an introducer that is fitted into a fitting hole, has a plurality of stock solution introduction holes passing through it in the circumferential direction, has a protruding central tip, and has grooves arranged radially on its tip surface.

(Function) When pitch is spun using the carbon fiber spinneret of the present invention configured as described above, the pitch supplied from the stock solution supply pipe connected to the spinneret body passes through the stock solution introduction hole of the introducer and passes through the tip. It passes through the radially arranged grooves on the surface and enters the discharge part of the stock solution discharge hole from the introduction part of the stock solution discharge hole, and is discharged and spun from its tip.

As a result, the spun pitch has a random carbon layer plane arrangement in the cross-sectional direction. Therefore, the carbon fiber obtained by firing and graphitizing this material has high strength, flexibility, and good elastic modulus and elongation.

(Example) An example of the carbon fiber spinneret of the present invention will be described with reference to the drawings. As shown in FIGS. 1a and 1b, there is a screw hole 10 with a diameter of 26 mm and a depth of 5 mm at the top to which the stock solution supply pipe is connected, and a screw hole 10 with a diameter of 10 mm in the middle following the screw hole 10 is opened at the base.
, has a bottomed introducer fitting hole 11 with a depth of 9 mm, and a thickness of 1
Following the introducer fitting hole 11, an introduction part 12a with an opening angle of 80°, an opening diameter of 1.5 mm, and a depth of 0° and 85 mm and a discharge part with a diameter of 0.15 mm and a depth of 0.15 mm are provided at the bottom of the mm. The introducer 14 shown in FIGS. 2a and 2b is fitted into the introducer fitting hole 11 of the cap body 13, which has a funnel-shaped stock solution discharge hole 12 consisting of 12b, as shown in FIGS. 3a and 3b. hand,
A carbon fiber spinneret 15 is configured.

The introducer 14 has a diameter of 10 m as shown in Figure 2 a and b.
m, a protrusion 17 with a height of 1.5 mm and a diameter of 4.5 mm is formed in the center by cutting out the outer peripheral side of the tip of a cylindrical block 16 with a length of 9 mm, and an arcuate cross section extending over a range of 45 degrees on the outer peripheral side. Four stock solution introduction holes 18 penetrate vertically at equal angular intervals, and four openings 0.3 mm in width, 0.3 mm in depth, and 0.1 mm in bottom width are arranged radially in the center of the tip surface of the tip protrusion 17. Grooves 19 are arranged radially.

When pitch is spun using the carbon fiber spinneret 15 of the embodiment shown in FIGS. 3a and 3b constructed in this manner, a stock solution supply pipe 20 connected to the spinneret body 13 as shown by the chain line in FIG. The supplied pitch passes through the stock solution introduction hole 18 with an arcuate cross section of the introducer 14, enters the annular passage 17a formed by the notch on the outer circumferential side of the tip, and from there passes through the radial direction of the tip surface of the introducer 14. It passes through the array of grooves 19, enters the introduction part 12a of the stock solution discharge hole 12, and is discharged and spun from the tip of the discharge part 12b of the stock solution discharge hole 12. In this way, the pitch of 8 μm in diameter spun by the spinneret 15 of the example results in a random carbon layer plane arrangement in the cross-sectional direction. Therefore, the carbon fiber obtained by firing and graphitizing the carbon fiber has high strength, flexibility, and good elastic modulus and elongation.

Note that the stock solution discharge hole 12 at the bottom of the spinneret body 13 of the carbon fiber spinneret 15 is a stock solution discharge hole 12' having a cross-sectional shape as shown in FIG.
``It may be replaced with ``.

Further, the stock solution introduction hole 17 of the introducer 14 is not limited to a circular cross section, and may be provided in a large number instead of a circular cross section.

(Effects of the Invention) As can be seen from the above description, according to the carbon fiber spinneret of the present invention, no voids are generated in the cross section, and it is possible to spin pitches that have a random carbon layer plane arrangement in the cross-sectional direction. Therefore, the carbon fiber obtained by firing and graphitizing the carbon fiber has high strength, flexibility, and good elastic modulus and elongation.

In addition, the carbon fiber spinneret of the present invention is easy to assemble and manufacture;
Porous structure is also possible.

[Brief explanation of drawings]

FIG. 1 shows a spinneret body in an embodiment of the carbon fiber spinneret of the present invention, in which a is a longitudinal sectional view, b is a plan view, and FIG. 2 is an introduction that fits into the spinneret body of FIG. 1. Fig. 3 shows an embodiment of the carbon delicate spinneret of the present invention;
is a longitudinal sectional view, b is a plan view, FIGS. 4 and 5 are sectional views of main parts showing other examples of the stock solution discharge hole at the bottom of the base body, and FIGS. 6 and 7 are respectively of conventional carbon FIG. 2 is a longitudinal cross-sectional view of a main part showing a fiber spinneret.

Claims (1)

[Claims] 1. The upper part has a large diameter screw hole to which the stock solution supply pipe is connected, the middle has a concentric bottomed small diameter introducer fitting hole following the screw hole, and the bottom part has a small diameter introducer fitting hole. A cap body that has an extremely small diameter stock solution discharge hole concentrically following the mounting hole, and the introducer fitting hole of the cap body is fitted, a plurality of stock solution introduction holes are passed through in the circumferential direction, and the center of the tip protrudes. A carbon fiber spinneret consisting of an introducer having grooves in a radial arrangement on its tip surface.