Wood cement board

Abstract

Provided is a wood cement board that has a pattern of acute-angled and deep recesses and projections on its surface, and that tends not to cause cracking during a hardening and curing process, a drying process, a transportation process and so on. The wood cement board has a pattern of recesses and projections on its surface, in which the distance from the apex of the projections to the rear face is 9 mm or more, and the distance from the apex of the projections to the base point of the recesses is 2 mm or more, and is equal to or less than half the distance from the apex of the projections to the rear face. The average specific gravity of the wood cement board as a whole, and the specific gravities of the projections and the recesses are each 1.1 or more, and the difference between the specific gravity of the projections and the specific gravity of the recesses is less than 0.1.

Description

technical field [0001] The present invention relates to a wood cement board having a concave-convex pattern surface on the surface, and more specifically, to a wood cement board having an acute-angled and deep concave-convex pattern surface on the surface, and is hard to generate cracks in the curing curing process, drying process, and handling process. . Background technique [0002] Wood-cement boards are manufactured by forming a base plate using a raw material mixture of hydraulic materials, silicic acid substances, wood reinforcements, and other materials as required, pressing the base plate, and performing curing and curing. Moreover, the wood cement board is widely used as exterior wall parts or base parts of ceramic tiles and other residential parts. In order to improve the appearance, the surface of the wood cement board for exterior wall parts is formed by adding irregularities such as brick patterns and blind seams. of various patterns. [0003] In recent years,...

AI Technical Summary

Problems solved by technology

[0011] However, in the method of Patent Document 1, the work of arranging the partition and the work of removing the partition are necessary, so the production efficiency is poor.

[0012] In addition, it is necessary to prepare various spacers depending on the depth, width, and length of the recesses, so it costs an initial cost. In the case of a pattern with a large number of recesses or a pattern with recesses of various shapes, the work becomes difficult. Complicated, further reducing production efficiency

[0013] In addition, when the concave portion is elongated across the surface of the wood-cement board, or has a large width, the workability is also poor, and the production efficiency is low.

[0014] Furthermore, the lower part of the floor layer after removing the partition is easy to crack, and it is difficult to make the difference in specific gravity between the convex part and the concave part less than 0.1. Cracks, in the coating process, the paint will be absorbed into the base material of the wood cement board, the strength, water resistance, frost resistance, weather resistance, etc. of the wood cement board will be greatly reduced, more paint is required, and the coating state is uneven question

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