JPH0542322B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of extrusion molding an inorganic product having recesses of a desired shape formed on its surface.

(Prior Art) Conventionally, inorganic products having recesses of a desired shape formed on their surfaces are generally manufactured by press molding. Furthermore, as seen in Japanese Patent Application Laid-Open No. 58-25917, a manufacturing method has been proposed in which an inorganic composition is extruded from a die and a concave portion is formed therein using a rotor having a convex portion on the circumferential surface.

(Problems to be Solved by the Invention) The above-described forming method using a press requires batch work, which has the disadvantage of low productivity and high cost. In addition, in the method of forming concave portions using a rotor in the molded product extruded from the die, the inorganic composition is moved by the protrusions of the rotor, so in order to maintain the dimensions and shape of the molded product, it is necessary to In other words, it is not possible to form large convex portions that would significantly change the cross-sectional shape of the molded product, in other words, it is impossible to form large recesses in the molded product.

An object of the present invention is to provide a method of forming deep recesses by extrusion at low cost.

(Means for Solving the Problems) In the present invention, an inorganic composition such as cement or gypsum is continuously forced into a die, and an inorganic molded product is extruded from the die opening. The above object is achieved by providing a rotor having a convex portion on its circumferential surface, protruding from the inner wall of the die, and rotating the rotor in synchronization with the speed at which the composition is injected.

(Function) When an inorganic composition such as cement or gypsum is continuously forced into a die and a rotor provided protruding from the inner wall of the die is rotated at the same speed as the composition is pushed, the die is On the surface of the extruded body extruded from the rotor, recesses corresponding to the protrusion shapes formed on the circumferential surface of the rotor are repeatedly formed along the extrusion direction for the number of rotations. As the recesses are formed in the molded body, the cross section of the molded body is deformed, but movement of the composition due to the deformation is regulated by the inner wall of the die. Therefore, the molded product extruded from the die is finished in a neat and specified size even if the recess of the rotary die is deep.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. Fig. 1 shows an extrusion molding apparatus used in the extrusion molding method of the present invention, and Fig. 2 A and B show one part of the die.
An example is given for each.

In the drawings, the die 1 includes one rotor 2 that is pivotally supported so as to protrude from the inner wall of the die 1, for example, from the upper surface thereof, and the die opening 3 has a rectangular cross-sectional shape.

The rotor 2 has a protrusion of a desired shape, in the illustrated embodiment a protrusion consisting of a spiral protrusion 2a, formed on its peripheral surface, and is rotated by, for example, a motor (not shown). A vacuum extruder 5 is connected to the die 1 via an adapter 4 for introducing a reinforcing member,
The inorganic composition was forced in together with the reinforcing member.

In the vacuum extruder 5, an upper screw cylinder 8 and a lower screw cylinder 9 each having a built-in screw 7 are communicated via a vacuum chamber 6.
A hopper 10 for supplying the inorganic composition 11 was formed above the upper screw cylinder 8.

The adapter 4 has an opening on its upper surface, through which the reinforcing member 14 is introduced into the adapter 4 through an impregnating bath 13 with a binder 12 such as epoxy or other room temperature or thermosetting resin. did. Although only one reinforcing member 14 is shown in the drawing, for example, three reinforcing members 14 are introduced.

A transfer conveyor 15 is disposed in front of the die 1, and a cutter 17 is provided at the front end of the transfer conveyor 15 to cut the extrusion molded product 16 into a desired length.
A pallet 18 on which the extrusion molded body 16 is placed was arranged in front of it.

Next, the extrusion molding method of the present invention using the extrusion device will be explained.

First, the hopper 10 is supplied with an inorganic composition 11 mainly consisting of cement mixed with short fibers of wholly aromatic polyamide, for example. The supplied inorganic composition 11 is transferred to the vacuum chamber 6 while being kneaded by the screw 7 inside the upper screw cylinder 8, and after being degassed within the vacuum chamber 6, it is transferred to the inside of the lower screw cylinder 9. and is guided to the adapter 4.

At the same time, a plurality of reinforcing members 14 made of long fibers made of long fibers of wholly aromatic polyamide knitted in the form of a braid are passed through an impregnating bath 13 of uncured binder 12 to form the reinforcing members 14. Impregnated with bonding agent 12, the reinforcing member 14 is introduced into the adapter 4.

In this way, the reinforcing member 14 is embedded at a desired position within the inorganic composition 11 extruded from the lower screw cylinder 9.

The inorganic composition 11 pushed into the die 1 together with the reinforcing member 14 is moved by the protrusions of the rotor 2 rotating between the side walls of the die 1, and its cross-sectional shape changes; Since it is regulated by the inner wall, it is formed into a clean surface of a desired shape from the die opening 3, and in the illustrated example, it is extruded as a plate-shaped body. The extruded molded product 16 is cut into a desired length by a cutter 17 while being transported forward by the transfer conveyor 15, and the cut extruded molded product 16 is placed on a pallet 18 in front of the conveyor 15 and placed in an autoclave (not shown). The inorganic composition 11 blended with the short fibers of the extruded body 16 and the binder 12 impregnated into the reinforcing member 14 are simultaneously cured in an autoclave to obtain a fiber-reinforced inorganic product.

The third figure shows a fiber-reinforced inorganic product 20 having a recess 19 formed by the ridges 2a of the rotor 2, manufactured by the above method.

Inorganic products produced by the method of the present invention have various uses such as building exterior walls and partitions.

(Effects of the Invention) According to the present invention, a rotor having a convex portion on its circumferential surface is provided so as to protrude from the inner wall of the die for molding the inorganic composition, and the rotor is rotated in synchronization with the pushing speed of the composition. , the movement of the composition by the rotor during molding is regulated, making it possible to extrude inorganic products with deep recesses, accurate dimensions, and a wide variety of shapes, resulting in higher productivity than conventional press molding methods. It is good and has effects such as lower cost.

[Brief explanation of drawings]

FIG. 1 is a diagram of the extrusion molding apparatus used to carry out the method of the present invention, FIGS. 2A and B are side sectional views of the die and a sectional view taken along line B-B in FIG. 2A, and FIG. 1 of the inorganic products produced by the method of the present invention
It is a perspective view of the main part of an example. 1...Dice, 2...Rotor, 2a...Protrusion (protrusion), 3...Dice mouth.

Claims (1)

[Claims] 1 In a method of continuously pushing an inorganic composition such as cement or gypsum into a die and extruding an inorganic molded product from the die opening, a convex part is formed on the peripheral surface by protruding from the inner wall of the die. 1. A method for extrusion molding an inorganic product, characterized in that a rotor is provided, and the rotor is rotated in synchronization with the pushing speed of the composition.