JPH04250003A - Manufacture of fiber-reinforced cement board - Google Patents

Abstract

PURPOSE:To manufacture a light-weight fiber-reinforced cement board by enabling continuous molding even if a material is hard to knead, by a method wherein fiber-reinforced cement mortar is fed between molded boards arranged on a molding head by facing on each other and the same is moved while striking the same with a hammer. CONSTITUTION:A truck 2 is provided so that the same sits astride a beltlike steel molding head. A hopper 3 for mortar and a material extruding screw 4 are fitted onto the truck 2. Further, a pair of molding boards 5 are fitted to the undersurface of the truck 2 at internals of a width of a boardlike molding G so that they come into contact with the top of the molding head 1. Then a guide boards 6 are constructed between the molding boards 5 and a hammer plate 7 having the planar bottom is fitted between the guide boards 6 so as to be capable of performing an up-and=down-motion. Then the cement mortar is loaded into a hopper 3, fed between the molding boards 5 through the screw 4, the truck 2 is moved while striking by the hammer plate 7 and fiber- reinforced cement board is molded continuously.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fiber-reinforced cement board, and more particularly to a method for continuously forming a fiber-reinforced cement board reinforced with glass fibers.

0002

[Prior Art] Among fiber-reinforced cement boards, glass fiber-reinforced cement boards (
GRC) and carbon fiber reinforced cement board (CFRC) are
When kneading materials prior to molding, it is difficult to mix them uniformly due to the added fibers, and the moldability of extrusion molding and casting methods is also not very good, so it is difficult to mold fiber-reinforced cement boards using these materials. The main method used is to spray the material into the formwork using a direct spray method or the like.

0003

[Problems with the prior art] However, since the above method involves spraying and forming cement mortar and reinforcing fibers, the material structure tends to become very dense, and the finished product has a high specific gravity and is also hard, making it difficult to cut with a saw. There were also problems such as poor workability such as nailing performance.

[0004] Furthermore, in order to reduce the weight of the wall board, a mold having a frame for forming ribs is used, and the cross section of the product shape is made thinner, and the strength is supplemented by the ribs.
In this case, the mold becomes complicated and demolding becomes difficult, resulting in poor productivity.

[0005]

[Problems to be Solved by the Invention] In view of the above-mentioned problems, the present invention aims to provide a method for manufacturing fiber-reinforced cement boards that can be continuously molded even with materials that are difficult to knead and that are lightweight as a result. It was done for a purpose.

[0006]

[Means for Solving the Problems] That is, the method for manufacturing a fiber-reinforced cement board of the present invention involves placing a pair of molded plates facing each other with a width interval of the plate-shaped molded product on a molding bed extending in a strip shape. A fiber-reinforced cement mortar with a low slump value is supplied between the pair of molding plates, and the fiber-reinforced cement mortar between the molding plates is uniformly hammered with a plate-shaped hammer, while the pair of molding plates is placed on the molding bed. It is characterized in that it is moved along the extending direction in accordance with the amount of cement mortar supplied.

[0007]

[Operation] The mortar material and reinforcing fibers used in this invention are difficult to knead uniformly in a hydrated state.
Mortar materials containing aggregate, reinforcing fibers such as glass fibers and carbon fibers are used. In the present invention, the mortar materials are mixed in a small amount of water within a range that allows uniform mixing, and specifically, a zero slump mortar with a water/cement ratio of 26% or less is obtained.

[0008] The present invention supplies this fiber-reinforced cement mortar with a low moisture content between molding plates arranged on a molding bed that regulate the width of the product. Hit evenly with a hammer and form between the forming plates. At the same time, by moving the molding plate along the molding bed, the fiber-reinforced cement board is continuously molded. The molded product discharged from the molded plate will not naturally deform unless external force is applied, since the cement mortar has zero slump. Note that after the molded product has been cured to the extent that it can be handled, it is cut into arbitrary lengths and sent to a curing process.

[0009]

[Example] Next, an example of the present invention will be described. FIG. 1 is a side view of an apparatus for implementing the method of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view of a hammer plate of the implementation apparatus, and FIG.
shows a side view of another hammer plate of the implementation device. On a band-shaped steel forming bed 1 with a width of 1 m and a length of 60 m,
A cart 2 is provided so as to straddle the cart, and a mortar hopper 3 and a material extrusion screw 4 are attached to the upper surface of the cart 2, and a pair of plate-shaped molded products G with a width interval of 45 cm are attached to the bottom surface of the cart 2. The plates 5, 5 are attached so as to be in contact with the upper surface of the molding bed 1, and a guide plate 6 is installed between the molding plates 5, 5.
, 6 were constructed, and a hammer plate 7 whose bottom surface was flat as shown in FIG. 2 was attached therebetween so as to be movable up and down. In the figure, 8 indicates a hammer drive device, and 4A indicates a screw drive motor.

Next, 330 parts by weight of cement, 150 parts by weight of perlite, 270 parts by weight of lightweight aggregate, and 4 parts by weight of silica sand.
00 parts by weight, 14 parts by weight of glass fiber, and 85 parts by weight of water were mixed in a mixer to obtain a cement mortar with a slump value of 0. This was put into the hopper 3, and the material was fed between the molding plates 5 through the screw 4, and molded. While hitting the material between the plates 5 and 5 with a hammer plate 7 at a pitch of 120 times/min, the cart was moved at a speed of 6 m/min to continuously form plates with a thickness of 3 cm.

After leaving it as it is for 6 hours, the molded plate G was 1.
It was cut at intervals of 8 m and steam-cured or autoclaved. The physical properties of the obtained molded plate G were as shown in Table 1.

Table 1

In Table 1, Comparative Example shows the physical properties of fiber-reinforced cement boards of the same shape obtained by the direct spray method. As is clear from Table 1, it was found that it exhibited physical properties comparable to those of conventional fiber-reinforced cement boards in terms of specific gravity and bending strength, as well as good water absorption and thermal conductivity. Further, in order to provide surface irregularities, molding was performed in the same manner using the hammer plate 7 shown in FIG. 3, which had a downward convex shape, and a plate body with a peripheral edge was molded.

Effects of the Invention As explained above, according to the method of the present invention, it is possible to mold materials with almost zero slump, so even if reinforcing fibers such as glass fibers are used, the materials can be kneaded uniformly. It also enables continuous molding of long board materials, and has various effects such as the ability to mold fiber-reinforced cement boards with high efficiency.

[Brief explanation of the drawing]

1 is a side view of an apparatus implementing the method of the invention; FIG.

FIG. 2 is a plan view of an apparatus implementing the method of the invention;

FIG. 3 is a side view of a hammer plate according to an embodiment of the invention.

FIG. 4 is a side view of another hammer plate according to an embodiment of the invention.

[Explanation of symbols]

1 Molded bed 2 Trolley 3 Hopper for mortar 4 Extrusion screw 5 Molded plate 6 Guide plate 7 Hammer plate G　Plate-shaped molded product

Claims (1)

[Claims] Claim 1: A pair of molded plates are arranged facing each other with a width interval of the plate-shaped molded product on a molded bed extending in a belt shape, and a fiber-reinforced cement mortar with a low moisture content is placed between the pair of molded plates. and moving the pair of molding plates along the extending direction of the molding bed in accordance with the amount of cement mortar supplied while uniformly hitting the fiber-reinforced cement mortar between the molding plates with a plate-shaped hammer. A method for manufacturing a fiber-reinforced cement board characterized by: