| 摘要 |
PROBLEM TO BE SOLVED: To provide a tread board which is provide to the door of a bathroom, or the like, to absorb water of feet, or the like, wherein the board prevents the floor from getting wet, the sense of touch remains dry even if it gets wet, and it has the ability of absorption and durability. SOLUTION: A water absorptive tread board is formed in the shape of a plate by mixing and blending a composition, composed by adding fiber materials for preventing cracks to powdery raw diatomaceous earth and cement, with water. A small amount of a coloring agent or sizing agent can be added to the composition as required. The composition preferably has weight ratio of 5 to 50 pts.wt. of woody fiber, such as woody chips or sawdust, 5 to 50 pts.wt. of pulp fiber, such as used paper or news paper, and 20 to 100 pts.wt. of cement to 100 pts.wt. of the raw diatomaceous earth. The board is preferably formed by extruding into a block shape by a screw extruder to cure it for cutting into a plate shape in a predetermined thickness.
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