JPS5941841B2 - Manufacturing method of inorganic board - Google Patents

Description

[Detailed description of the invention] This invention relates to a method for manufacturing an inorganic board.

In general, rock wool-based mineral fiberboards have high surface hardness because the starch reinforcing material moves to the vicinity of the surface layer after drying.

However, since such fiberboard is used as a building material, actual processing is performed on the ends.

In this case, the end surface was cut and the starch reinforcing material was removed during actual processing, resulting in a decrease in the strength of the end.

Further, since carbon dioxide gas is generated in the magnesium carbonate plate during the heating process, many carbon dioxide gas holes are generated and the strength is reduced.

For this reason, resin is injected or paint is applied, but these methods are also complicated.

Therefore, an object of the present invention is to provide a method for manufacturing an inorganic plate that has high strength at the actual processed end and is easy to manufacture.

In summary, the method of the present invention involves pressure-forming the main body of an inorganic wet mat with a pressure plate having a convex part for actual processing at the end, and compression-molding the end part of the wet mat with the convex part to form the main body. This method is characterized by obtaining an inorganic plate having an actual processed end portion having a higher specific gravity than that of the conventional method.

The inorganic wet mat is made of calcium aluminate trisulfate hydrate (3CaO・A1□03・3
Preferably, the material is composed of CaS04.31-32H20 (hereinafter abbreviated as TSH) and calcium silicate.

Note that in addition to TSH and calcium silicate, lime, other fillers, and fibrous reinforcing materials may be added freely.

These are generally wet mixed in the presence of water to form a slurry and then subjected to molding.

Next, the method of the present invention will be explained with reference to the drawings.

First, as shown in FIG. 1, a TSH-calcium silicate slurry 1 is stored in a slurry vat 2 and is scooped up by a paper making machine 3 into a wet mat 4 having a moisture content of approximately 70%.

Next, this is cut into predetermined dimensions and press-molded using a press-molding machine 5 as shown in FIG.

This press molding machine is equipped with a pressure plate 10 having a convex part 9 for actual processing at the end thereof, and press-forms the main body 4a of the wet mat 4, and compression-molds the end part 4b with the convex part 9 for actual processing. A shaped mat with processed edges is obtained.

This formed mat is dried in a dryer 6 to become an inorganic board 7 having an actual processed end portion 11, and then its surface is coated by a coating machine 8 shown in FIG.

Note that instead of press molding using the press molding machine 5, molding using a roll or the like may be performed.

As described above, in the method of the present invention, since the end portion 4b is compression molded in the state of the wet mat 4, the end portion 4b is molded by the movement of the material.
The specific gravity of b is higher than that of the main body.

Therefore, the strength of the actual processed end portion 11 is increased. On the other hand, since the main body 4a is not subjected to excessive compression, its heat insulating properties and sound absorbing properties are not impaired.

Further, since the surface of the wet mat 4 can be patterned at the same time as the molding, the process can be shortened.

Furthermore, since the moisture content of the wet mat 4 can be lowered to about 63% by pressure molding, drying becomes extremely easy.

Furthermore, since the end portions are not actually processed by cutting as in the conventional example, material loss can be reduced.

Furthermore, since the amount of grinding of the surface layer accompanying machining and finishing as in the conventional example can be reduced, the decrease in surface hardness is reduced.

Next, examples will be described.

Example: An inorganic plate was obtained from a TSH-calcium silicate slurry using the apparatus shown in FIGS. 1 to 4.

In this case, the moisture content of the wet mat at the time of papermaking is 7
0%, and the moisture content after press molding is 63-65
He was in charge.

Comparative Example: An inorganic plate was obtained by shaping a TSH-calcium silicate slurry having the same composition as in the example without press molding.

The ends of this inorganic plate were actually processed using Tenona finishing.

The results of the performance tests of the inorganic plates obtained in the above Examples and Comparative Examples are shown in the following table.

[Brief explanation of drawings]

FIGS. 1 to 4 are process explanatory diagrams of the method of the present invention. 4...Wet mat, 5...Press molding machine, 7...Inorganic board.

Claims (1)

[Scope of Claims] 1. A main body of an inorganic wet mat is pressure-molded using a pressure plate having a convex part for actual processing at the end, and the end part of this wet mat is compression-molded with the convex part, and compared with the main body. A method for manufacturing an inorganic plate, characterized in that the inorganic plate has an actual processed end portion with a high specific gravity. 2. Claim 1, wherein the inorganic wet mat is a wet mat whose main components are calcium aluminate trisulfate hydrate and calcium silicate.
Method for manufacturing an inorganic board as described in Section 1.