JP2647155B2 - Manufacturing method of laminated cement board - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for manufacturing a laminated cement board, and more particularly, to a method of laminating a cement layer serving as a surface layer such as a colored layer on a base layer. The present invention relates to a method for manufacturing a cement board.

[Conventional technology]

Conventionally, in the case of producing a colored cement board, a base layer is formed from a cement composition on a molding conveyor, hot water or the like is sprayed on the layer, and the colored cement composition is supplied in a layered manner.
It has been customary to press these laminates with a press roll while uncured.

In order to increase the thickness of the plate material other than the colored layer, a similar process was performed when two or more layers composed of the cement compound were laminated.

[Problems of the prior art]

However, in the case of the above-mentioned laminating means, it is necessary to smooth the surface of the base layer on the base layer in order to uniformly distribute the hot water to be sprayed and supplied. There was a disadvantage that the lamination interface became clear and peeling was easily caused from this portion.

In particular, there was a defect that peeling was remarkably caused by freeze-thaw in a cold region.

[Problems to be solved by the invention]

In view of the above disadvantages, the present invention can increase interlayer adhesion strength,
An object of the present invention is to provide a method for manufacturing a laminated cement board which does not cause delamination and is easy to carry out.

[Technology that solved the problem]

According to the method for producing a laminated cement plate of the present invention, the uncured cement plate-like molded body serving as the base layer is uniformly scratched with a roll having needle-like projections on the uncured cement plate-like molded body. The present invention is characterized in that a cement composition for forming an upper layer is supplied in layers, and a laminate is continuously compressed by a roll from the upper layer.

[Action]

Laminating a layered cement composition, activating the layers with warm water, etc., and making them adhere to each other is essential to increase the chemical bonding strength, but at the same time increases the surface area of the bonding interface and increases the physical bonding strength It is also effective.

Therefore, in the present invention, following the spraying of warm water for activating the surface on the base layer, scratches are uniformly formed on the surface of the base layer with a roll having needle-like projections, thereby increasing the surface area. , To exert the anchor effect.

These scratches are long when the needle-shaped projection roll is rotated in the opposite direction to the direction of transport of the base layer, and in the opposite case, they become pinhole-shaped scratches. Is appropriately selected depending on the properties, thickness, and amount of lamination.

Since the scratches are provided in a uniformly dispersed state, the envelope plane itself keeps smoothness, so that there is no unevenness or flow of warm water.

Finally, the laminated bodies are integrally adhered to each other by the press roll, and as a result, the interfaces of the laminated layers are tightly adhered together.

〔Example〕

 Next, an embodiment of the present invention will be described.

FIG. 1 is a side view of an apparatus for performing the method of the present invention.

(Example 1) A layer 1 made of a cement composition used in a conventional method, consisting of cement, aggregate, reinforcing fiber and water, was formed on a molding conveyor 2, and the surface was smoothed uniformly with a roll 3, followed by warm water 4. Immediately after that, the roll 5 having a large number of needle-like projections was rotated so as to be in a forward direction with respect to the transport direction of the base layer 1 to form a large number of scratches on the surface.

Next, the colored cement compound 6 compounded according to a conventional method was sprayed on the base layer 1 in a layered manner, finally smoothed with a pressing roll 7, and then cured and cured according to a conventional method.

(Example 2) Example 1 was the same as Example 1 except that the rotation direction of the roll 5 having the needle-like protrusions was rotated in the opposite direction to the base layer 1.
A plate was formed in the same manner as described above.

ASTM-C was applied to the laminated cement board obtained in Examples 1 and 2 and the laminated cement board obtained by the conventional method as a comparative example.
A freeze-thaw test using -666 gave the following results.

In the table, ○ indicates no abnormality, Δ indicates minimal peeling, and X indicates occurrence of delamination.

[Effect] As described above, since the surface of the layer to be laminated is uniformly roughened and the surface area is increased as described above, a laminated board material having extremely excellent adhesion strength between layers, particularly excellent freeze-thaw resistance can be obtained. .

In addition, the present invention has an effect that it is easy to implement since it is only necessary to add a needle-shaped projection roll to the conventional device.

[Brief description of the drawings]

FIG. 1 is a side view of an apparatus for performing the method of the present invention.

Claims (2)

(57) [Claims] 1. An uncured cement-made plate-like molded body serving as a base layer is provided with a cement composition for uniformly scratching a scratch with a roll having needle-like projections and forming an upper layer on the surface. A method for producing a laminated cement board, comprising supplying the laminate in a layered form and continuously compressing the laminate with a roll from the upper layer. 2. The method according to claim 1, wherein the cement composition for forming the upper layer is a colored cement composition for a decorative layer.