JP3463541B2 - Manufacturing method of inorganic plate - 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 manufacturing an inorganic plate, and more particularly to a method for manufacturing an inorganic plate useful for building boards such as roof tiles and exterior materials.

[0002]

2. Description of the Related Art Conventionally, as a method for producing an inorganic plate having a pattern pattern such as unevenness on the surface, a papermaking method such as a Haschek method or a Fourdrinier method, or extrusion molding or cast molding is used. The method of manufacturing by the method of was known. Among these, the method of manufacturing an inorganic plate by the papermaking method,
It has been commonly practiced because of its excellent productivity.

[0003]

However, in such a method for producing an inorganic plate, a flat plate-like material cannot be provided and it is difficult to achieve a high design of a housing member in recent years. It is necessary to increase the plate thickness of this flat plate-shaped product, resulting in a large weight, which makes it difficult to carry out work during construction.

Further, if the thickness of the plate-like material is to be suppressed,
It is a flat plate that must be molded by bending, which reduces productivity and makes it difficult to form sharp bent edges. The crack was generated.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to produce an inorganic plate having a thin feeling and a high sense of thickness with high productivity. An object of the present invention is to provide a method for producing an inorganic plate that can be manufactured.

[0006]

The method for producing an inorganic plate according to claim 1 of the present invention has a three-dimensional shape when an aqueous slurry (5) containing cement as a main component is used as a green sheet (1). It dehydrates in the dehydration zone (9).

Furthermore, the production method of the inorganic board according to claim 1 of the present invention, the dewatering zone (9) along the longitudinal direction at the end of the suction box (3) and the suction box (3) standing The suction box (3) has a raised deckle (2), and is characterized in that the suction box (3) has a convex cross-sectional shape.

The method for producing an inorganic plate according to a second aspect of the present invention is characterized in that the aqueous slurry (5) is vibrated in the dehydration zone (9).

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.

FIG. 1 is a schematic view showing a method for manufacturing an inorganic plate according to an embodiment of the present invention. FIG. 2A shows
It is the perspective view which showed the dehydration zone which concerns on one Embodiment used for the manufacturing method of the inorganic board of this invention, (b) of FIG.
2 is a sectional view of FIG. 2 (a), and FIG. 2 (c) is
It is a perspective view of the green sheet concerning one embodiment obtained by a manufacturing method of an inorganic board of the present invention.

As shown in FIG. 1, the method for producing an inorganic plate of the present invention comprises an aqueous slurry (5) containing cement as a main component.
Is used as a green sheet (1) for dehydration in a dehydration zone (9) having a three-dimensional shape.

The above-mentioned aqueous slurry (5) contains cement as a main component, and is contained in a flow box (4) as shown in FIG. 1, for example. In addition to the above, the aqueous slurry (5) further contains an aggregate and, if necessary, a reinforcing material, a fiber and the like as auxiliary components.

As the cement, for example, Portland cement, fly ash cement, blast furnace cement or the like is used.

Further, as the aggregate, crushed stone such as granite, serpentine, silica stone powder, shirasu balloon, glass balloon, silica, pearlite, sand, and beads are used.

Pulp powder or the like is usually used as a reinforcing material to be blended if necessary. further,
As the fibers, for example, cellulose-based pulp fibers, mineral fibers such as asbestos, organic resin fibers such as polypropylene and vinylon, glass fibers, carbon fibers, metal fibers and the like can be used.

The green sheet (1) is formed, for example, as shown in FIG. 1, by making the aqueous slurry (5) by a papermaking machine (8).
The green sheet (1) may be provided with a pattern such as unevenness on the surface.
The papermaking machine (8) is not particularly limited, and examples thereof include a papermaking machine such as a Hatschek system and a fourdrinier system.

For example, the above aqueous slurry (5) is prepared as shown in FIG.
As shown in Fig. 3, the green sheet (1) is carried by the endless felt (7) wound in an annular shape by the roll (6) and further passes through the dehydration zone (9) while being carried by the felt (7). It does not matter even if it is formed as.

The dehydration zone (9) is a zone for dehydration when the aqueous slurry (5) is used as the green sheet (1). The dehydration zone (9) has a three-dimensional shape, and the green sheet (1) obtained by passing through the dehydration zone (9) is not only appropriately dehydrated but also has irregularities. It will be formed into the three-dimensional shape it has. In addition, as the felt (7) described above, the material of the aqueous slurry (5) can be passed through the dehydration zone (9) in the vicinity of an inlet of the dehydration zone (9) so that the material does not overflow. It does not matter even if a device such as gradually changing the shape of the felt (7) is made.

In particular, as shown in FIGS. 1 and 2 (a) and (b), the dehydration zone (9) extends along the longitudinal direction at the suction box (3) and the end of the suction box (3). When the suction box (3) has a convex cross-sectional shape, the aqueous slurry (5) reaches the dehydration zone (9). When it is carried, it is continuously dehydrated by the suction box (3), and the aqueous slurry (5) is formed by the convex cross section of the suction box (3) and the raised deckle (2). ) Is regulated by the shape of the suction box (3), and a deformed green sheet (1) having hanging piece portions at both ends as shown in (c) of FIG. 2 can be continuously formed. As is certainly remark that thickness is thin while, in which it is possible to produce the inorganic board with a sense of thickness such shown in the figure 2 (c) in more reliably high productivity.

Further, when the aqueous slurry (5) is vibrated in the dehydration zone (9), when the aqueous slurry (5) is conveyed to the dehydration zone (9), the aqueous slurry (5 ), The water in the same aqueous slurry (5) easily escapes, and more reliable dehydration can be performed in the dehydration zone (9). As a result, the moldability of the obtained green sheet (1) is surely improved.

By the dehydration of the green sheet (1), the water content of the green sheet (1) becomes low,
Usually, it is about 50 to 70 wt%, but it is not limited to this and can be set freely according to the degree of pressing time and the like.

The green sheet (1) may be press molded using a mold or the like. As this mold, various molds can be selected according to the mold pattern to be attached to the surface of the green sheet (1). For example, a simple flat plate mold may be used, and irregularities may be formed. It does not matter if the mold that has it is used. This press molding is performed, for example, by disposing the green sheet (1) on which a mold is placed between press machines. The press molding time and the like can be freely set according to the water content of the green sheet (1).

Furthermore, after press-molding, curing may be carried out to obtain an inorganic plate.
The curing method is carried out in an autoclave, and is cured in the autoclave at a temperature of 150 to 200 ° C. for 7 to 15 hours to obtain an inorganic plate.

Before the autoclave curing, the green sheet (1) is left at room temperature for 2 to 5 hours, if necessary, and then subjected to steam and moisture curing at 50 to 90 ° C. for 10 to 100 hours. It is also possible to adopt a method of doing it.

The green sheet (1) may be cut in advance to an appropriate size according to the size desired to be obtained as an inorganic plate.

According to the present invention, when the aqueous slurry (5) is conveyed to the dehydration zone (9) by the production method as described above, the aqueous slurry (5) is continuously dehydrated by the dehydration zone (9) and the solid The shaped dehydration zone (9) regulates the aqueous slurry (5) into the three-dimensional shape of the dehydration zone (9), and the shape of the green sheet (1) is determined at the stage when the cake is formed. Therefore, the three-dimensional and irregularly shaped green sheet (1) can be continuously formed, and as a result, it is possible to manufacture an inorganic plate with a thin plate thickness and a sense of thickness with high productivity. Is something that can be done.

[0027]

EXAMPLES Examples of the present invention will be given below.

Example 1 Ordinary Portland cement and silica stone powder were mixed in a ratio of 4: 3, and pulp powder (NUKP) was added to the total amount of them.
30wt of material mixed by adding 6wt% and adding water
% Aqueous slurry (5).

This aqueous slurry (5) is made into paper by a papermaking machine (8) having a dehydration zone (9) as shown in FIGS. A green sheet (1) having a water content of 10 to 20 wt% having a shape as shown in (c) was obtained.

The obtained green sheet (1) had a maximum pressure of 50 kg / cm ² and a pressure holding time of 1.0 second for 12 seconds /
Press molding was performed in a cycle. After completion of the press molding, the finished state was examined by visually observing the state of the bent portion at the end of the green sheet (1).

As a result, in the obtained inorganic plate, since the shape of the green sheet (1) is determined at the stage when the cake is formed, the shape does not collapse as shown in FIG. 2 (c). It was finished nicely.

Comparative Example 1 The procedure of Example 1 was repeated except that the ordinary box-shaped suction box (3) was installed in a part of the papermaking machine (8).
Made with dehydration, and made into green sheets (1)
Became.

After that, the obtained green sheet (1)
After bending into a shape as shown in Fig. 2 (c),
In the same manner as in Example 1, after press-molding and after the press-molding was completed, the state of the bent portion at the end of the green sheet (1) was visually observed to check the finished state.

As a result, in the obtained inorganic plate, since the shape of the green sheet (1) is determined after the step of forming the cake, the green sheet (1) loses flexibility. The same flexibility was lacking, and cracks were generated in the bent portion.

Taking into consideration the above-mentioned matters, Example 1
As can be seen by comparing the sample of Comparative Example 1 with the sample of Comparative Example 1, the shape of the green sheet (1) of Example 1 is determined at the stage where the cake is formed, as compared with the sample of Comparative Example 1. For this reason, even though the plate thickness is thin, the one of Example 1 can produce a more irregularly shaped product more clearly, giving a feeling of thickness, and the one of Example 1 is continuous. Therefore, it can be said that the inorganic plate can be produced without interruption, and as a result, the productivity can be maintained high.

That is, it can be said that the production method of the present invention is capable of producing an inorganic plate with a high sense of thickness while having a small thickness.

[0037]

According to the method for producing an inorganic plate according to the first aspect of the present invention, the aqueous slurry (5) becomes the dehydration zone (9).
When it is carried to the dehydration zone (9), it is continuously dehydrated, and the three-dimensional dehydration zone (9) transforms the aqueous slurry (5) into the three-dimensional shape of this dehydration zone (9). Since the shape of the green sheet (1) is regulated at the stage where the cake is formed, the three-dimensional and irregularly shaped green sheet (1) can be continuously formed, and as a result, the plate can be formed. It is possible to manufacture an inorganic plate with a high feeling of thickness while having a small thickness with high productivity.

[0038] According to the manufacturing method for the inorganic board according to claim 1 of the present invention, in addition to the above, the aqueous slurry (5) comes transported to dewatering zone (9), successively by a suction box (3) While being dehydrated, the aqueous slurry (5) is restricted to the shape of the suction box (3) by the sectional shape of the convex suction box (3) and the raised deckle (2). , It is possible to continuously form the irregular shaped green sheet (1) having hanging piece portions at both ends, and as a result, it is possible to more reliably obtain a thick inorganic plate even though the plate thickness is surely thin. It can be manufactured with extremely high productivity.

According to the method for producing an inorganic plate according to claim 2 of the present invention, in addition to the case of claim 1 , when the aqueous slurry (5) is conveyed to the dehydration zone (9), the aqueous slurry ( Vibration is applied to 5), water in the aqueous slurry (5) is easily removed, and dehydration can be performed more reliably in the dehydration zone (9). The fluidity is improved, and as a result, the moldability of the obtained green sheet (1) is surely improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a method for manufacturing an inorganic plate according to an embodiment of the present invention.

FIG. 2A is a perspective view showing a dehydration zone according to an embodiment used in the method for producing an inorganic plate of the present invention, and FIG. 2B is a sectional view of FIG. FIG. 3C is a perspective view of a green sheet according to an embodiment obtained by the method for manufacturing an inorganic plate of the present invention.

[Explanation of symbols]

1 green sheet 2 deckles 3 suction box 5 Aqueous slurry 9 dehydration zone

Claims (2)

(57) [Claims] 1. A method for producing an inorganic plate , comprising: dehydrating in a three-dimensional dehydration zone when an aqueous slurry containing cement as a main component is used as a green sheet, wherein the dehydration zone is a suction box and this suction. at the end of the box are those having a deckle launched along the longitudinal direction, of the non-machine quality plate you characterized in that the formation of the cross-sectional shape of the suction box in a convex shape Production method. 2. A manufacturing method for the inorganic board according to claim 1, wherein the applying vibration to the aqueous slurry in the dewatering zone.