Method of manufacturing an inorganic board
AssigneeNichiha Corporation
InventorsShiro Nakajima, Masaki Kanai
Life of this patent
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Abstract
An inorganic board consisting of a cured base mat and a cured surface mat is manufactured by forming a surface mat by the dry method on a base mat formed by a paper making method, embossing the composite mat, and curing the embossed composite mat. Ridges each having an enlarged top are formed on the surface of the base mat when a plural number of single mats formed by the paper making method are rolled and laminated around a making roll having a surface on which a plural number of ring grooves are formed. The ridges of the base mat engage the surface mat since each ridge has an enlarged top to improve the interlaminate strength between a cured base mat and a cured surface mat of the resulting inorganic board.
Claims4
A method of manufacturing an inorganic board comprising the steps of:
- forming a single mat by a paper making method from a slurry substantially consisting of a cement material and reinforcing fiber;
- rolling and laminating a plural number of said single mats around a making roll to form a base mat, said making roll having a surface on which a plural number of ring grooves are formed;
- unrolling said base mat rolled and laminated around said making roll by cutting said base mat in a fixed length and stripping said cut base mat from said making roll;
- pressing the surface of said base mat to enlarge the top of ridges formed on the surface of said base mat by the ring grooves of said making roll;
- spreading a powdery mixture substantially consisting of cement material and reinforcing fiber to form a surface mat on said base mat to form a composite mat;
- embossing the composite mat;
- and
- incubating said embossed composite mat to cure the cement material in said composite mat.
Dependencies are inferred from the claim text.