Wood cement board and method for the manufacturing thereof

Abstract

The object of the present invention is to provide a light weight wood cement board having high strength and sufficient toughness. To attain the object, the present invention provides a wood cement board made of a cured raw material mixture of cementitious inorganic powder (C), a material containing silica (S), bundled wood fiber, and mica, wherein the weight ratio of said cementitious inorganic powder and said material containing silica is set to be in the range of between 40:60 and 50:50. The bundled wood fiber has a bulky shape, and gives good toughness to said wood cement board, with the mica improving its dimensional stability. In a case where the C / S is set to be in the range of 40:60 and 50:50, the curing of said board proceeds smoothly, leaving little unreacted material remaining in the board.

Description

technical field [0001] The invention relates to a wood cement board and a manufacturing method of the wood cement board. Background technique [0002] In the prior art, cement boards, i.e., wood cement boards, which use wood chips, shavings, wood fibers (pulp), etc. ). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 9-87002 [0004] Patent Document 2: Japanese Unexamined Patent Publication No. 9-39154 [0005] Patent Document 3: Patent No. 2913016 [0006] Patent Document 4: JP-A-2000-264701 [0007] The above-mentioned wood-cement board can be produced, for example, by a dry method in which a predetermined amount of water is added to a raw material mixture containing cement-like inorganic powder and the above-mentioned wood reinforcing material and spread on a formwork, thereby forming a bottom plate of the raw material mixture, The soleplate is then compacted and cured to harden it. This dry method is appreciated as a highly efficient productio...

AI Technical Summary

Problems solved by technology

[0008] As the above-mentioned wood-based reinforcing material, in the wood chip cement board using wood chips, long fibers are not contained in the raw material mixture, so the reinforcing effect due to the entanglement of long fibers in the bottom plate of the formed raw material mixture cannot be expected. , the strength of the bottom plate is also insufficient, so there is a problem that the bottom plate is prone to collapse during use, and there is also the possibility that the wood chip reinforcement effect of the product is insufficient and the mechanical strength is insufficient.

[0009] As the above-mentioned wood-based reinforcing material, in the particle cement board using shavings, the shavings are easily entangled in the raw material mixture, and it is difficult to uniformly mix the raw material mixture, and when the raw material mixture is spread on the formwork, there is a problem that it is difficult to spread the raw material mixture evenly. , so the above-mentioned dry method is difficult to apply. Therefore, the inefficient method is usually used, that is, adding water to the raw material mixture to make it into a slurry, and then filling it into the mold

In addition, since the shavings have a rough shape, there may be a problem that the strength of the unhardened molded product and the product are not sufficiently improved due to mutual entanglement.