JP2690245B2 - Extrusion molding method for net-reinforced inorganic products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extrusion-molding a net-reinforced inorganic product, and more particularly to an improvement in a method for molding an inorganic plate-shaped molded body having a reinforcing net integrally embedded on its back surface.

[0002]

2. Description of the Related Art Conventionally, a kneaded product of a cement composition has been very widely formed by extrusion. This extrusion has an advantage that a hollow product can be easily manufactured, and a lightweight product can be manufactured in spite of its wall thickness. By the way, in the extrusion molding of this kind of hollow product, it is difficult to exert sufficient strength with respect to bending strength, flexibility, etc. if it is simply extrusion molded. A reinforcing net is inserted along the extrusion direction of the material, and the reinforcement material is embedded at the same time as the extrusion molding to form a reinforcement structure (see, for example, Japanese Patent Laid-Open Publication No. Sho.
57-201611, JP-A-1-99810).

[0003]

However, in the case of the above-mentioned extrusion molding method, the extrusion kneading material is once bisected into layers at the hollow pin support holder portion for forming the hollow portion, and then rejoins at the mouthpiece outlet portion. Since they are integrated, it is considered that a structurally discontinuous portion can be formed in the central portion of the product thickness even if they cannot be distinguished visually, and there is a problem that the strength is microscopically insufficient. Therefore, no matter how the reinforcing net is inserted on the surface, if the strength at the center of the product is insufficient,
Corresponding strength cannot be improved sufficiently.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is capable of effectively preventing the production of a fragile portion of the product which is homogeneous in the thickness direction and has sufficient bending strength. It was made for the purpose of providing an extrusion molding method for a net-reinforced inorganic product.

[0005]

That is, according to the extrusion molding method of a net-reinforced inorganic product of the present invention, a concave groove is formed in a molded product G inside the extrusion molding die 1 by displacing the inner surface 1A of the die 1. The pins 2 to be formed are aligned, and the reinforcing net 3 is inserted through the insertion slit 4 by inclining from the lower side surface 1A of the extrusion molding die 1 so as to be a forward direction in the extrusion direction, and the reinforcing net 3 is extruded. Bottom 1A of the base 1 and the pins 2 ... 2
It is characterized in that extrusion molding is performed simultaneously with the extrusion kneaded material G ′ by passing s between the lower surface and the lower surface.

[0006]

1 is an enlarged vertical sectional view of an essential part of an extrusion molding apparatus used in the method of the present invention, and FIG. 2 is a horizontal sectional view of FIG.
The operation will be described with reference to this figure.

The extrusion molding apparatus used in the extrusion molding method of the net-reinforced inorganic product of the present invention forms a concave groove in the extrusion molding die 1 by displacing it to the inner lower surface 1A of the die 1. Pins 2 ... 2 are aligned and this pin 2 ... 2
A gap s through which the reinforcing net material 3 can pass is formed between and the inner lower surface 1A of the base 1. The base 2A of the pin is provided with an insertion slit 4 for the reinforcing net material 3 which is inclined from the lower side surface 1A of the extrusion molding die 1 in the forward direction of the extrusion direction.

At the time of extrusion molding, the extrusion kneaded material G'is supplied to the molding die 1, and at the same time, the reinforcing net 3 is inserted through the insertion slit 4, and the reinforcing net 3 is inserted into the bottom surface 1A of the extrusion molding die 1 and the pins 2 ... 2 The extrusion kneading material G ′ is simultaneously extruded by passing s between the lower surface and the lower surface. In the above, the reinforcing net 3 is a woven cloth net having relatively coarse mesh made of metal fiber, glass fiber, carbon fiber or synthetic fiber, and both flexible and inflexible can be used. is there.

Further, as shown in FIG. 2, it is desirable to use a pin having a distal end portion 2B spread in a tapered shape 2C. By this taper-shaped enlarged portion 2C, the extrusion kneaded material G '
This is because the pressure to the reinforcing net 3 increases and the permeation pressure of the extruded kneaded material G ′ into the reinforcing net 3 is obtained. By such an extrusion molding method, as shown in FIG.
.. G2 is formed, and the product G in which the reinforcing net 3 is integrally laminated on this parallel strip is molded.

Moreover, since the pins 2 ... 2 for forming the parallel strips G2 ... G2 are eccentric to the inner surface 1A of the die 1, a pin holder is not required, so that the extrusion kneaded material G ′ is 2 in the die 1. It is possible to extrude a product that is structurally strong without being divided. Also, the reinforcing net 3 is a pin 2
Since the position of the reinforcing net 3 in the thickness direction is regulated by 2, the embedding depth of the reinforcing net 3 is made uniform and the reinforcing net 3 is integrally embedded in the top surface of the ridge portion of the product, so that the reinforcing effect can be sufficiently obtained.

[0011]

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

A cement kneaded product was prepared which comprises a cement, a finely divided silica sand, a reinforcing fiber to which water and methyl cellulose as an extrusion aid are added, and an extrusion molding cement mixture. Inside the base with width B = 30 cm and height H = 3 cm, width b = 2
cm, height h = 1.5 cm, 8 pins 1m from the bottom 1A inside the base
While supplying the cement kneaded material G ′ into the extrusion-molded die 1 which forms a gap of m and is arranged on the inner bottom surface of the die at equal intervals, the reinforcing net 3 made of synthetic fiber is also fed from the insertion slit 4 A product G having a cross-sectional shape shown in No. 3 was extruded. The extruded body was cut into pieces each having a length of 1 m, and naturally cured for 12 hours and then cured for 8 hours in an autoclave.

As Comparative Example 1, eight hollow forming pins having a rectangular cross section with a width of 2 cm and a height of 1 cm were extruded in a die having the same inner surface dimensions as in the embodiment, with a forming die supported in the center of the die. After molding and curing under the same conditions as in the example, a plate-shaped body having a cross-sectional shape shown in FIG. 4 was obtained.

Further, as Comparative Example 2, as in Comparative Example 1, except that the reinforcing net 3 is embedded on one surface of Comparative Example 1, FIG.
A plate-shaped body having a cross-sectional shape shown in was obtained. When the bending strength test and the bulk specific gravity measurement were performed on the plate-shaped bodies obtained in Examples and Comparative Examples 1 and 2, the results shown in the table were obtained.

[0015]

【table】

As is clear from the table, it was confirmed that the examples were lighter than the comparative examples, but had comparable bending strength. In addition, when observing the state of the fracture surface at the time of carrying out bending strength, in each of the comparative examples, a stepwise fracture surface appears in the central portion of the product thickness, and a structural discontinuous portion occurs in this portion. However, in the case of the example, such a characteristic fracture surface did not appear.

[0017]

As described above, according to the present invention, when the extrusion molding is performed, the kneaded material is extruded through a series of paths without being divided into two parts in the molding die, so that there is no thickness direction in the tissue. It is possible to obtain excellent strength in combination with the embedding of the reinforcing net without forming a continuous portion. Further, the reinforcing net is also extruded together with the product by being pressed by the pin for forming the ridge, so that it has various effects such as easy management of the embedding depth and easy molding of a homogeneous product.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a sectional view of a product obtained by the method of the present invention.

FIG. 4 is a cross-sectional view of Comparative Example 1.

5 is a cross-sectional view of Comparative Example 2. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Molding die 1A ... Inner bottom surface 2 ... Pin 3 ... Reinforcing net 4 ... Insertion slit s ... Gap G '... Extrusion kneaded material G ... Product

Claims (1)

(57) [Claims] 1. A pin 2 for forming a concave groove in a molded article G inside the extrusion die 1 by displacing the inner lower surface 1A of the die 1.
2 are aligned, the reinforcement net 3 is inserted from the lower side surface 1A of the extrusion molding die 1 so as to be forward in the extrusion direction through the insertion slit 4, and the reinforcement net 3 is placed on the inner bottom surface 1A of the extrusion molding die 1. And a lower surface of the pins 2 ... 2 are passed through and extrusion molding is performed simultaneously with the extrusion kneaded material G ′.