JPH01266937A - Manufacture of bushing for spinning modified glass fiber - Google Patents

Abstract

PURPOSE:To easily form with good dimensional accuracy the bushing having many modified projecting nozzles by making a circular projection type nozzle as the base and forming thereon. CONSTITUTION:Many circular projecting nozzles 3 having a nozzle hole 2 are formed by punching at certain intervals on a bushing plate material 1. The isometric four way of the outer periphery of the front half part of this respective projection nozzle 3 is formed in a cross shaped projection nozzle 5 by forming by the press operation of the press machine fitted with a tool 4. The bushing 6 spinning the glass fiber of a cruciform sectional shape is thus obtd. The bushing 6 having many modified projection type nozzles 3 having a high cooling efficiency immediately after spinning, high reflection and refraction of a light and enough strength as the reinforcing material of a composite material can therefore be made easily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a bushing for spinning novel glass fibers of unusual shape.

(Prior Art) Conventionally, glass fibers have been spun using a bushing 8 having a large number of circular convex nozzles 7 at regular intervals, as shown in FIG. Therefore, all the glass fibers obtained had a circular cross section.

(Problems to be Solved by the Invention) Glass fibers with a circular cross section have low cooling efficiency immediately after spinning, and weakly reflect and refract light.Furthermore, glass fibers with a circular cross section have insufficient strength as reinforcing materials for composite materials. cannot be said.

For this reason, there is a demand for a glass fiber that has high cooling efficiency immediately after spinning, strong light reflection and refraction, and sufficient strength as a reinforcing material for composite materials.

Glass fibers with irregular cross-sections such as T-shaped, seven-shaped, triangular, square, oval, peanut-shaped, etc. are said to be suitable as glass fibers that can meet these requirements. Bushings that can be used to spin fibers are extremely difficult to manufacture and have not yet appeared.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a method for easily producing a bushing capable of spinning glass fibers having irregular cross-sections.

(Means for Solving the Problems) In order to solve the problem described in item 1, the manufacturing method of the bushing for irregularly shaped glass fiber spinning of the present invention is to provide a bushing plate material with a large number of circular convex nozzles at regular intervals. It is characterized in that it is formed by punching, and then the outer periphery of this convex nozzle is shaped using a tool of a desired shape to form an irregularly shaped convex nozzle.

(Function) As described above, the method for producing a bushing for spinning irregularly shaped glass fibers of the present invention is extremely easy to manufacture because a irregularly shaped convex nozzle can be obtained by adding a molding process to the circular convex nozzle. Moreover, a bushing with uniform wall thickness of each nozzle and high dimensional accuracy can be obtained.

(Example) An example of the method for manufacturing a bunsink for spinning irregularly shaped glass fibers according to the present invention will be described with reference to the drawings.

As shown in Fig. 1a, the vertical 1
00+nm, width 250mm, thickness 2mm bushing plate material 1, as shown in Figure 1, in a staggered arrangement with 5mm intervals in the vertical direction and 5mm intervals in the horizontal direction, the tip outer diameter is 2.2mm,
Two circular convex nozzles 3 with a height of 4 mm each having a nozzle hole 2 with a base end outer diameter of 4 mm, a diameter of 1.6 mm, and a vertical portion of 2 mm are formed by punching, and then the outer periphery of each convex nozzle 3 is The first half, that is, the outer circumference of the part with an outer diameter of 2.2 mm and a length of 2n+m, is formed from equiangular squares by the pressing operation of a press machine equipped with the forming tool 4 shown in FIG. As shown, a bushing 6 is formed into a cross-shaped convex nozzle 5 to spin glass fiber having a cross-section.

The thus obtained bushing 6 has high dimensional accuracy, with variations in the number of cross-shaped convex nozzles 5 being ±20 μm or less, and deviations in the outer peripheral shape being ±20 μm or less.

The forming tool 4 has a forming die 4b in which the intersecting corners of the cross-shaped slits 4a are made into an arc shape in order to perform a process in which the equiangular sides of the outer circumference of the circular convex nozzle 3 are recessed into an arc shape. ,
A pin 4c to be inserted into the nozzle hole 2 is provided at the center of the intersection of the sulins 4a.

However, when glass fiber is spun using the bushing 6 manufactured as described above, the molten glass G is discharged from the convex nozzle 5 as shown in FIG. 2, wets and spreads on the tip surface, and is drawn in this state. Therefore, the obtained glass fiber F has a cross-shaped cross-sectional shape that is the same as the outer shape of the tip of the convex nozzle 5. Therefore, since the length in the circumferential direction is longer and the area of the outer circumferential surface is significantly larger than that of conventional glass fibers having a circular cross section, the cooling efficiency immediately after spinning is increased and elongation of the glass fibers is prevented.

Further, since the glass fiber F thus obtained has a cross-shaped cross section, the incident angle of light varies depending on the circumferential position of the outer circumferential surface, and light is strongly reflected and refracted. Furthermore, when this glass fiber is twisted, it has sufficient strength as a reinforcing material for a composite material because it is intertwined with each other and does not slip as in the case of circular glass fibers.

Incidentally, the manufacturing method of the bushing for spinning glass fiber having an irregular shape in the above embodiment is for producing a bushing for spinning glass fiber having a cross-shaped cross section. When making the bushings 68 to 6e of the convex nozzles 5a to 5e shown in FIGS. 4a to 4e for spinning, it is preferable to use the forming tools 48 to 4e shown in FIGS. 5a to 5e.

(Effects of the Invention) As can be seen from the above explanation, according to the manufacturing method of the bushing for spinning irregularly shaped glass fibers of the present invention, the cooling efficiency immediately after spinning is high, the reflection and refraction of light are strong, and the composite material is strengthened. The present invention has an excellent effect in that a bushing having a large number of irregularly shaped convex nozzles capable of spinning irregularly shaped glass fibers having sufficient strength as a material can be manufactured with good dimensional accuracy and extremely easily.

[Brief explanation of the drawing]

Figures 1a to d are diagrams showing the steps of an embodiment of the method for manufacturing a bushing for spinning irregularly shaped glass fibers of the present invention;
The figure is a perspective view of the main parts showing the state in which glass fibers with a cross-section are spun using the bushing obtained by the manufacturing method shown in Figure 1, and Figures 3a to 3e each show the cross-sectional shape of the irregularly shaped glass fibers. Figures 4a to 4e are diagrams showing the shapes of the convex nozzles for spinning the glass fibers of Figures 3a to e, respectively, and Figures 5a to e are diagrams showing the convex nozzles of Figures 4a to e, respectively. Figure 6 showing the shape of a forming tool for forming
The figure is a perspective view of main parts of a conventional bushing. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd., page 7 (d) (Kbuchi 5d)

Claims (1)

[Claims] 1. Form a large number of circular convex nozzles at regular intervals on the bushing plate material by punching, then mold the outer periphery of the convex nozzles using a tool of the desired shape to form irregularly shaped convex nozzles. A method for producing a bushing plate for spinning irregularly shaped glass fibers.