Building boards, manufacturing apparatus and prefoamed plastics

Details Building boards, manufacturing apparatus and prefoamed plastics Building boards, manufacturing apparatus and prefoamed plastics

B - Operations, Transporting

32

B

B32B 3/16 (2006.01) B28B 11/04 (2006.01) B32B 5/18 (2006.01) B32B 13/12 (2006.01) E04C 2/04 (2006.01)

Patent

CA 2312657

A building board comprising a cement substrate, a top coated layer formed on the front surface of the substrate, and a plastic sheet formed on the back surface of the substrate. The plastic sheet should preferably be formed of a polyethylene sheet. Since the impregnation of water from the back surface of building board can be effectively prevented, the change in dimension of board as a whole can be minimized.

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