JP2000271914A - Manufacture of inorganic plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inorganic sheet with high base quality and improved patterning properties at a low running cost by pouring a raw material slurry for a cement product into a press mold and superposing a paper-making processing sheet for the raw material on the slurry and dehydrating and press-molding the raw material. SOLUTION: A raw material slurry 1 for a cement product is poured into a press mold 2 of a resin mold and a paper-making processing sheet 3 for the raw material are superposed on the slurry 1 using an adsorbing pad 4. Further, the upper face of the sheet 3 is softly pressed by roll press 5 and a dehydrating plate 7 with a filter cloth 6 is brought into contact with the lower face. In addition, the materials 1, 3 are sucked using a vacuum pump 8 and press-molded with the help of a press 9 while being dehydrated to obtain an inorganic plate 10. The raw material slurry 1 is obtained by mixing cement such as blast furnaces cement, aggregates such as crushed stones and reinfing materials such as asbestos together with a specified amount of water into a slurry form. For a base material part which has noting to do with surface patterning, the sheet 3 which shoes a low running cost and a superb quality as a base is used. Thus the satisfactory surface patterning properties, high base quality and low running cost are ensured.

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 an inorganic plate. More specifically, the invention of this application relates to a method for producing an inorganic plate which has a low running cost, is excellent in substrate quality and surface patternability, and can produce an inorganic plate useful as an exterior material for houses and the like. .

[0002]

2. Description of the Related Art Conventionally, when manufacturing an inorganic plate used as an exterior material such as an outer wall material of a house or the like or a roof material, it is manufactured by a paper making method or an extrusion method or a casting method.

[0003]

However, in the paper making method (paper making to press molding), the running cost is low and the substrate quality such as strength is excellent. Due to the low fluidity of the sheet (because the water content is about 60% by weight), when press-formed after papermaking, the filling of the paper-made sheet into the press mold is poor, and a deep and sharp pattern cannot be formed. However, there is a problem that surface patternability is poor.

In addition, the extrusion method and the casting method have the advantage of excellent surface patternability, but have a high running cost and are hardly satisfactory in terms of substrate quality such as strength. There was a problem. For this reason, the invention of this application provides a method for producing an inorganic plate in which running costs are low and a papermaking method capable of producing an inorganic plate with excellent substrate quality is mainly used, and the drawback of the surface is improved. It is intended to be.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a first invention is to inject a raw material slurry of a cement-based product into a press mold, and to use the same. Provided is a method for producing an inorganic plate, comprising laminating a raw material sheet on top of the sheet and press-forming while dewatering.

A second invention relates to a method for producing the above-mentioned inorganic plate wherein the solid content of the raw material slurry and the raw material sheet is equalized. According to a fourth aspect of the present invention, there is provided a method for producing any one of the above inorganic plates, wherein the water content of the raw material sheet is adjusted to 40 to 70% by weight. According to a fifth aspect of the present invention, there is provided a method for producing any one of the above-mentioned inorganic plates, wherein the raw material sheet-forming sheets are press-formed while being dewatered from above.
In the invention of the press molding while dewatering,
The present invention provides a method for producing any one of the above inorganic plates, wherein the upper surface of the raw material sheet is pressed by a roll press, and then dewatered and press-formed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the features as described above, and embodiments thereof will be described below. FIG. 1 is a manufacturing process diagram showing an embodiment of the invention of this application. As illustrated in FIG.
According to the invention of this application, a raw material slurry sheet (1) of a cement-based product is poured into a press die (2) made of a resin mold, and then a raw material sheet formed by a paper machine (not shown). (3) is overlapped using the suction pad (4), and if necessary, the upper surface of the raw material sheet (3) is lightly pressed by a roll press (5), and then the filter cloth (6) is applied to the lower surface.
Abuts a dehydrator (7) equipped with a vacuum pump (8)
A press (9) is used to perform press molding while suctioning and dewatering to produce an inorganic plate (10).

In the invention of the present application, a raw material slurry for a cement-based product (1) refers to a raw material used for producing a cement-based product such as a cement board, for example, a cement such as Portland cement or blast furnace cement. And aggregates such as fly ash, silica sand powder, crushed stone, shirasu balloon, glass balloon, silica, perlite,
A material obtained by mixing a reinforcing material such as asbestos, pulp, synthetic resin fiber, and glass fiber with a required amount of water to form a slurry.

The mixing ratio of the raw material slurry (1) is, for example, most preferably 35 to 50 parts by weight of cement, 15 to 30 parts by weight of fly ash, 5 to 15 parts by weight of silica sand powder, and 5 to 15 parts by weight of pulp. is there. The raw material sheet (3) is, for example, a sheet obtained by forming the same raw material slurry as described above using a paper machine (not shown).

When the raw material slurry (1) is injected into the press mold (2), for example, the uneven pattern (11) such as a texture pattern (joint pattern) formed at the bottom of the press mold (2). The raw material slurry (1) is poured to the depth of the unevenness of (1), and if necessary, vibration is applied, so that the raw material slurry (1) can be smoothly filled into every corner of the uneven pattern (11).

In FIG. 1, (12) is an endless felt, and (13) is a bed. In the method for producing an inorganic plate according to the invention of the present application, the first invention is characterized in that the surface portion in contact with the press mold (2) relating to the surface patternability has high fluidity, and the corner of the press mold (2) is high. Use raw material slurry (1), which is easy to form into a deep and sharp pattern by filling up to various levels, and a raw material papermaking sheet with low running cost and excellent substrate quality for base materials that are not related to surface patternability By using (3), the running cost is low and the main feature is a papermaking method that can produce an inorganic plate with excellent substrate quality, and it is characterized in that its drawback, surface drawability, has been improved. is there.

In the second invention, the quality of the upper and lower layers can be approximated by making the solid content of the raw material slurry (1) and the raw material sheet (3) equal (the same or substantially the same). It is characterized in that a homogeneous inorganic plate can be produced without fear of causing peeling or warping. Further, the third invention is characterized in that the solid content concentration of the raw material slurry (1) is adjusted to 25 to 35% by weight.

That is, when the solid content is less than 25% by weight, dehydration takes a long time, and when the solid content exceeds 35% by weight, the raw material slurry to the press mold (2) is used. The filling of (1) may not be performed smoothly, and the surface patternability may be slightly deteriorated. On the other hand, when the solid content concentration is adjusted to 25 to 35% by weight, all of the above problems are solved. That is because

A fourth aspect of the present invention is characterized in that the water content of the raw material sheet (3) is adjusted to 40 to 70% by weight. That is, when the water content is less than 40% by weight, the adhesiveness and affinity between the raw material sheet (3) and the raw material slurry (1) become poor, and when the water content exceeds 70% by weight. This is because, while the dehydration takes a long time, when the water content is adjusted to 40 to 70% by weight, all of the above problems are solved.

Further, in the fifth invention, when dewatering,
As illustrated in the above, by dewatering through a dewatering machine (7) having a filter cloth (6) attached to the raw material papermaking sheet (3) overlaid on the raw material slurry (1),
In the process of moving the water upward, the raw material slurry (1) and the raw material papermaking sheet (3) fit together,
The feature is that the affinity is improved.

According to a sixth aspect of the present invention, when press-forming while dewatering, the upper surface of the raw material sheet (3) is lightly pressed by a roll press (5) in advance as shown in FIG. The raw material sheet (3) can be defoamed with the linear pressure of (5) and the raw material sheet (3) can be blended with the raw material slurry (1) to improve the adhesion and affinity between the two. It is characterized by the following.

The pressure at the time of pressing by the roll press (5) is 10 kg / cm ² or less, and the pressure at the time of press molding by the press (9) while dewatering is 30 to 60 kg / c.
m ² is optimal. In the invention of this application,
The shape of the press mold, the injection thickness of the raw material slurry, the thickness of the raw material sheet, the thickness of the inorganic plate, dehydration conditions, press molding conditions, and the like may be appropriately selected and determined according to the purpose, application, and the like.

The present invention will now be described in more detail with reference to the following examples.

[0019]

EXAMPLE Raw material slurry adjusted to a solid content concentration of 30% by adding water to 43 parts by weight of cement, 23 parts by weight of fly ash, 10 parts by weight of silica sand powder, and 10 parts by weight of pulp is poured into a press mold. A raw material sheet is prepared by adjusting the water content to 60% by weight with the same composition as the raw material slurry, and the upper surface is rolled to 9 kg.
/ Cm ² , and then dehydrated from above while applying a pressure of 45
Press molding at kg / cm ² , 250mm × 250
A cement board having a size of 12 mm × 12 mm was manufactured, and the surface patterning properties such as the pattern (joint) depth, the pattern (joint) angle, the sharpness of the pattern (joint), and the substrate quality (strength) were examined. As shown, it has a sharp pattern (joint) and the substrate quality (strength)
An excellent cement board was obtained.

[0020]

[Table 1]

For comparison, a cement board was manufactured by the papermaking method (Comparative Example 1) and the extrusion method / casting method (Comparative Example 2) with the same composition as in the above example. The results of examining the surface patternability and the substrate quality (strength) are also shown in Table 1, but all had problems with either the surface patternability or the substrate quality (strength).

[0022]

As described in detail above, according to the invention of this application, an inorganic plate having good surface patternability and excellent substrate quality can be manufactured at low running cost, and a thickness of about 12 to 15 mm (particularly, It is most suitable for producing an inorganic plate of about 12 mm).

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram showing one embodiment of the present application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material slurry 2 Press type 3 Raw material sheet 4 Adsorption pad 5 Roll press 6 Filter cloth 7 Dehydration board 8 Vacuum pump 9 Press 10 Inorganic plate 11 Uneven pattern 12 Felt 13 Bet

Claims (6)

[Claims] 1. A method for producing an inorganic plate, comprising: injecting a raw material slurry of a cement-based product into a press mold, superimposing a raw material forming sheet thereon, and press-forming while dewatering. 2. The method for producing an inorganic plate according to claim 1, wherein the solid content of the raw material slurry and the raw material sheet is equalized. 3. The solid content concentration of the raw material slurry is 25 to 3
3. The method for producing an inorganic plate according to claim 1, wherein the amount is adjusted to 5% by weight. 4. The raw material sheet is made to have a water content of 40 to 70.
The method for producing an inorganic plate according to any one of claims 1 to 3, wherein the method is adjusted to weight%. 5. The method for producing an inorganic plate according to claim 1, wherein the raw material papermaking sheets are press-formed while being dewatered from above. 6. The method for producing an inorganic plate according to claim 1, wherein when press-forming while dewatering, the upper surface of the raw material sheet is pressed in advance by a roll press, and then press-formed while dewatering.