JPH02143829A - Extrusion method of bulk material - Google Patents

Abstract

PURPOSE:To produce proper bulk material and reduce brittleness, which develops crack and the like, by a method wherein a mold, in which tubular resin efflux gaps are produced multiply by opposedly clamping an upper mold and a lower mold each other, is set on an extruder and the multiply tubular resin bodies extruded from the molds are narrowed radially at the end of the extruder so as to be made into an integral body by being compressed during extrusion. CONSTITUTION:A nesting mold 2 is piled up to a base mold 1 by supporting the supporting pieces 9 and 9 of the nesting mold 2 onto the engaging grooves 6 and 6 of the base mold 1. In this case, a resin efflux gas 16 is formed between the inner surface of the though-like mold body 5 of the base mold 1 and the outer surface of the through-like mold body 7 of the nesting mold 2. Similarly, the nesting mold 2 and a nesting mold 3 are piled up, resulting in forming a resin efflux gap 17. Similarly, a resin efflux gap 18 is formed through the piling-up of the nesting mold 3 and a nesting mold 4. By opposedly clamping an upper mold B, which is nested similarly as the lower mold A, and the lower mold A each other so as to form as multi-layer tubular resin efflux gaps in order to form a mold. When resin is extruded under the condition that said mold is set to an extruder, the resin is extruded through the tubular resin efflux gaps. In this case, since the inner diameter is further restricted from the mold toward the end of the extruder, the multiply tubular resin bodies are made into an integral body by being compressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The bulk material is porous and has a light lid. Producing a molded bulk material that is brittle can expand the uses of the bulk material and is of industrial significance.

[Conventional technology]

Conventionally, as a bulk material extrusion molding method, a large number of round rods are extruded, these many round rods are polymerized in parallel, and the sizing die is used to solidify them into one piece, which maintains porosity due to the voids between the round rods. It was something to do.

[Problem to be solved by the invention]

In the bulk material extrusion molding method described in the conventional technology, a large number of round rods are polymerized and solidified into one body, so if you want to maintain a large gap between the round rods, you can solidify the round rods strongly into one body. First, the bonding force between the round rod-like bodies became small, making them prone to cracking. On the other hand, in an attempt to increase the bonding force between the round rods, if the rods are hardened together with great pressure, the voids between the rods become smaller, which often results in the product not being suitable as a bulk material.

The present invention has been made in order to solve the drawbacks of the prior art, and its purpose is to provide a bulk material extrusion method that is suitable for bulk materials and is less brittle and prone to cracking. be.

[Means for resolving line order]

In the bulk material extrusion molding method of the present invention, a large number of gutter-like outflow gaps are formed on the stack to form a lower mold, and an upper mold formed in the same manner as the upper mold is coupled oppositely to the lower mold to form a cylindrical resin. A mold is formed by forming multiple outflow gaps, the mold is installed in an extrusion molding machine, and the multiple cylindrical resin body extruded from the mold is narrowed in diameter at the end of the extrusion molding machine and extruded as a compressed unit. It is something to be molded.

〔Example〕

Hereinafter, the present invention will be explained based on drawings of embodiments.

FIG. 1 shows an exploded perspective view of the lower mold A, where 1 is the basic mold and 2.3.4 is the 1-shaped mold. Basic mold 1 is gutter-shaped mold 5
A locking groove 6.6 is formed on the upper edge of the rain cover. The stacked mold 2 has a locking groove 8.8 on the upper edge of the persimmon-shaped mold body 7.
and a support piece 9 projecting outwardly from the upper edge of the rain.
9. Layered type 3.4 is also layered type 2
It is formed in the same manner as 10.13, a gutter-like mold body, 11.14, a locking groove, and 1 and 2, support pieces.

The lower mold A is constructed as shown in FIG.

At the same time, the supporting piece 9 of the overlapping mold 2 is inserted into the locking groove 6.6 of the basic mold 1.
．． 9 is supported, and the overlapping mold 2 is superposed on the base mold 1. In this case, a resin outflow gap 16 is formed between the inner surface of the gutter-like mold body 5 of the basic mold 1 and the outer surface of the gutter-like mold body 7 of the stacked mold 2. The stacked molds 2 and 3 are similarly polymerized to form a resin flow gap 17, and the stacked molds 3 and 4 are also polymerized in the same manner to form a resin outflow gap.

FIG. 3 shows a mold in which a lower mold A and an upper mold B formed in the same manner are coupled oppositely to each other to form a multi-layered cylindrical resin flow gap.

When this mold is installed in an extrusion molding machine and the resin is extruded, the resin is extruded from the cylindrical resin outflow gap. In this case, the resin is extruded as multiple cylindrical resin bodies. The inner diameter of the extruder is further reduced in the end direction than the mold of the extrusion molding machine, and the multiple cylindrical resin body is integrated with H-compression. After this, it is extruded from an extruder and cooled to form a bulk material. Note that the resin used in the present invention is a thermoplastic resin that can be extruded.

〔Effect of the invention〕

Since the present invention has a queen-sized structure, the extruded bulk material is difficult to crack.

That is, since it is formed by compressing multiple cylindrical resin bodies,
The outermost layer is originally formed by deforming an integrated cylindrical part and is not joined later, so it is difficult to break even if it is not compressed with a large pressure.

However, since it does not need to be compressed with a large pressure, many and large voids are formed, making it suitable as a bulk material.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a lower mold used in the present invention, FIG. 2 is a cross-sectional view of the lower mold shown in FIG. 1, and FIG. 3 is a cross-sectional view of the mold used in the present invention. A...lower mold, B...upper mold, 1...basic mold, 2,3
．． 4...Stacked type. Figure 1 [12 Figure 153 Co29 \1//

Claims (1)

[Claims] A number of gutter-like outflow gaps are formed on the stack to form a lower mold, and an upper mold formed in the same manner as the lower mold is coupled oppositely to the lower mold to form multiple cylindrical resin outflow gaps and molded. A bulk material extrusion molding method in which the mold is set in an extrusion molding machine, and the multiple cylindrical resin bodies extruded from the mold are narrowed in diameter at the end of the extrusion molding machine and extruded as a compressed integral body.