JPH0773845B2 - Extrusion molding method for inorganic products with reinforced net - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for extrusion-molding an inorganic product containing a reinforcing net.

[Conventional technology]

BACKGROUND ART Heretofore, a kneaded product containing cement or the like as a main raw material has been extruded to produce a building board or the like.

In this case, a reinforcing bar may be embedded in the molded product for extrusion molding for the purpose of improving the strength of the molded product.

As disclosed in Japanese Patent Publication No. 53-47261, a crosshead die is used as a means for extrusion molding while embedding the reinforcing bar, and the reinforcing bar is supplied from the rear surface of the molding die toward the confluence point. It is known that, as disclosed in Japanese Patent Publication No. 61-59886, reinforcing bars are continuously inserted into a molding die along the flow direction of the kneaded material.

[Problems of conventional technology]

However, when using the crosshead manufacturing method,
Since the kneading material is supplied from another method with the reinforcing bar as a boundary, there is a drawback that the adhesion between these material layers is poor and the interfacial peeling is likely to occur.

In the latter case, the reinforcing bar may be exposed on the surface of the product, or the position in the product may not be fixed and the reinforcing bar may be embedded in a wavy manner due to the influence of the flow of the extruded material, There was a problem that a sufficient reinforcing effect could not be obtained.

[Problems to be Solved by the Invention]

In view of the above problems, the present invention has an object of obtaining an extrusion molding method of a reinforcing net-containing inorganic product capable of embedding a reinforcing material in a uniform state, and capable of extruding an inorganic product with low extrusion resistance. It was made.

[Technology that has solved the problem]

That is, the extrusion molding method of an inorganic product containing a reinforcing net of the present invention, in the case of extrusion molding a plate-shaped inorganic molded body, on the inner bottom surface of the molding die, the reinforcing net supporting block body at the appropriate intervals in the width direction, It is characterized in that it is provided so as to be retractable into and out of a molding die, and an inorganic kneaded material is extrusion-molded while supplying a reinforcing net from the rear of the molding die onto the reinforcing net supporting block body.

[Action]

When molding the inorganic kneaded product into a plate-like body by extrusion molding,
In order to embed the reinforcing bar, it is possible to embed it by inserting the reinforcing bar from the rear of the molding die toward the molding die along the extrusion direction.

However, in this case, when the reinforcing bar is a single fiber, the embedding position is not fixed as described above, and when it is a net, the material is pushed by the flow and is exposed on the surface of the molded product. I will end up.

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 embedding position of the reinforcing net in the molded product is regulated by these blocks.

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

Since the net-shaped reinforcing bar allows the kneaded material to flow through, it is desirable that the opening be 20 mm or more.

〔Example〕

 Next, an embodiment of the present invention will be described.

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

(Example 1) Five blocks 2 ... 2 each having a width of 2 cm are formed on the inner bottom portion 1A of a molding die 1 for extruding a plate having a thickness of 3 cm and a width of 30 cm.
It is provided inward and downward by adjusting bolts 3 ... 3 so that it can project and retract, and the projection height is set to 5 mm from the inner bottom 1A. A glass fiber net 4 having an opening of 20 mm was supplied from the rear of the molding die 1.

The cross-sectional shape of the obtained molded product G is as shown in FIG.
It was observed that the concave and convex pattern in which the supporting blocks 2 ... 2 were concave was provided on the back surface side, and that the net-shaped reinforcing bars 4 were exposed in places at the bottom of the concave portions 2 '.

As the net-shaped reinforcing bar 4, vinylon, polypropylene net, carbon fiber, aramid fiber, and stainless net were 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 the net-shaped reinforcing bar having an opening of 20 mm was used instead of the net-shaped reinforcing bar having an opening of 20 mm. Only the incompletely shaped cross section of the part could be formed.

(Comparative Example 2) A molded product having the same shape as that of Example was extrusion-molded without using the net-shaped reinforcing bar in Example 1.

Next, when the bending strength was measured for Examples and Comparative Example 2, the average strength was 127 kg / cm ^{2 in} the JIS No. 4 bending test in the Examples, whereas it was 58 kg / cm ² in the Comparative Examples. .

〔effect〕

As described above, according to the present invention, the reinforcing bar is embedded in the material, and the embedding position can be accurately regulated by the supporting block. Therefore, it is possible to extrude a molded article having excellent average strength. It will be.

[Brief description of drawings]

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

Claims (1)

[Claims] 1. When extrusion-molding a plate-shaped inorganic molded body, a reinforcing net supporting block body is provided on the inner bottom surface of the molding die at appropriate intervals in the width direction so as to be retractable into and out of the molding die. An extrusion molding method for an inorganic product containing a reinforcing net, which comprises extruding an inorganic kneaded product while supplying the reinforcing net from the rear of the die onto the block body for supporting the reinforcing net.