JPH03230907A - Extrusion molding method for inorganic products with reinforcing net - Google Patents

Abstract

PURPOSE:To obtain the title method capable of uniformly embedding a reinforcing material by a method wherein reinforcing net supporting blocks are provided to the inner bottom surface of a molding die at an appropriate interval in the lateral direction of the molding die so as to freely protrude into and retract from the die and an inorg. kneaded material is subjected to extrusion molding while a reinforcing net is supplied to the reinforcing net supporting blocks from the rear of the molding die. CONSTITUTION:Five blocks 2... 2 each having a width of 2cm are provided at the inner bottom part 1A of a molding die 1 for the extrusion molding of a plate-shaped body so as to be freely protrude into and retract from the molding die 1 by adjust bolts 3... 3 to be set to a protruding height of 5mm from the inner bottom part 1A and a cement compound for extrusion molding prepared according to a usual method is supplied to the molding die to perform extrusion molding and, at the same time, a glass fiber net 4 having a mesh size of 20mm is supplied from the rear of the molding die 1. As a result, the reinforcing net 4 becomes a state embedded in the material and the embedding position thereof can be accurately prescribed by the supporting blocks and, therefore, the extrusion molding of a molded product G excellent in average strength becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a method for extrusion molding inorganic products containing reinforcing nets.

[Conventional technology]

BACKGROUND ART Conventionally, construction boards and the like have been manufactured by extrusion molding a kneaded material whose main raw material is cement or the like.

In this case, in order to improve the strength of the molded product, reinforcing bars may be embedded in the molded product and extrusion molded.

As a means of extrusion molding while embedding reinforcing bars, a cross-head die is used, as disclosed in Japanese Patent Publication No. 53-47261, and the reinforcing bars are supplied from the back side of the forming die toward the confluence point. Kotoya, special public official Sho 61-59886
It is known to continuously insert reinforcing bars into a molding die along the flow direction of the kneaded material, as disclosed in No.

[Problems with conventional technology]

However, when using the crosshead manufacturing method,
Since the cross-wire material is supplied from different directions across the reinforcing bars, there is a drawback that the adhesion between these material layers is poor and interface peeling is likely to occur.

In the latter case, the reinforcing bars may be exposed on the surface of the product, or the reinforcing bars may be embedded in a wavy manner due to the influence of the flow of the extruded material without being positioned in the product. There was a problem that a sufficient reinforcing effect could not be obtained.

[Problem to be solved by the invention]

In view of the above-mentioned problems, the present invention aims to provide a method for extrusion molding a single inorganic product containing a reinforcing net, which allows reinforcing material to be embedded in a uniform state, and which has low extrusion resistance and can extrude an inorganic product. It was done for a purpose.

[Technology that led to solving the problem]

That is, in the extrusion molding method of an inorganic product containing a reinforcing net according to the present invention, when a plate-shaped inorganic molded body is extruded, the reinforcing net supporting blocks are placed on the inner bottom surface of a molding die at appropriate intervals in the width direction. The inorganic kneaded material is extrusion-molded while the reinforcing net is provided so as to be freely protrusive and retractable into the forming die, and the reinforcing net is supplied from the rear of the forming die onto the reinforcing net supporting block body.

[Effect]

When forming an inorganic kneaded material into a plate by extrusion molding,
In order to embed the reinforcing bars, the reinforcing bars can be inserted by inserting the reinforcing bars from the rear of the molding die toward the molding die along the extrusion direction.

However, in this case, if the reinforcement is in the form of a single fiber, the embedment position cannot be determined as described above, and if it is in the form of a net, the material is pushed by the flow and becomes exposed on the surface of the molded product. Put it away.

Therefore, blocks for supporting the net-like reinforcing material are provided at appropriate intervals on the inner bottom surface of the molding die, and the blocks regulate the embedding position of the reinforcing net in the molded product.

Further, since the kneaded material flows into the gaps between the blocks from between the net-like reinforcing bars and fills the gaps, the entire net-like reinforcing bars are not exposed on the surface of the molded product.

Note that in order to allow the cross-wire material to flow through the net-like reinforcing bars, it is desirable that the mesh opening be 20 mm or more.

〔Example〕

Next, the present invention will be explained in detail.

FIG. 1 is a sectional view of an apparatus for carrying out the method of the present invention, and FIG.
The figure is a front view taken along the line nn in FIG. 1, and FIG. 3 is a sectional view of the obtained molded body.

(Example 1) A block 2 with a width of 2 clll was placed on the inner bottom part IA of a molding die 1 for extrusion molding a plate-shaped body with a thickness of 3 cm and a width of 30 cm.
For extrusion molding, 5 pieces of 2 are provided inwardly in the molding die 1 so as to be freely protrusive and retractable by adjustment poles 1-3...3, and set to have a protruding height of 5 mm from the inner bottom IA. At the same time as the cement mixture is supplied and extruded, a glass fiber net 4 with an opening of 20 mm is inserted from the rear of the molding die 1.
was supplied.

The cross-sectional shape of the obtained molded product G is as shown in Fig. 3.
It was observed that the back side had a concave-convex pattern in which the supporting blocks 2...2 were concave, and that the net-like reinforcing bars 4 were exposed in some places at the bottom of the concave portions 2'.

As the net-like reinforcing bars 4, a net made of vinylon, polypropylene, carbon fiber, aramid fiber, and stainless steel was used, and extrusion molding was performed in the same manner as in the example.

(Comparative Example 1) Extrusion molding was carried out in the same manner as in Example 1, except that net-shaped reinforcing bars with an opening of 10 mm were used in place of the net-shaped reinforcing bars with an opening of 20 mm in Example 1. Only parts with incomplete molding cross sections were able to be molded.

(Comparative Example 2) A molded product having the same shape as in Example 1 was extruded without using any of the net-like reinforcing bars in Example 1.

Next, when the bending strength of Example and Comparative Example 2 was measured, the Example had an average of 127 k in the JIS No. d bending test.
g/, ffl, whereas the comparative example had an intensity of 58k.
g/cd.

〔effect〕

As explained above, in this invention, the reinforcing bars are embedded in the material, and the embedded position can be precisely regulated by the support block, so it is possible to extrude molded products with excellent average strength. It will become.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an apparatus for carrying out the method of the present invention;
The figure is a front view taken along the line ■--■ in FIG. 1, and FIG. 3 is a sectional view of the obtained molded body.

Claims (1)

[Claims] (1) In the case of extrusion molding a plate-shaped inorganic molded body, reinforcing net supporting blocks are provided on the inner bottom surface of the molding die at appropriate intervals in the width direction so as to be freely retractable into the molding die,
An extrusion molding method for an inorganic product containing a reinforcing net, characterized in that the inorganic kneaded material is extruded while supplying the reinforcing net from the rear of the molding die onto the reinforcing net supporting block body.