Manufacture of cementitious board

Details Manufacture of cementitious board Manufacture of cementitious board

1973-11-06

1976-06-22

Van Balen, William J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

52631, 156202, 156245, 156257, 156268, 264333, 428 70, 428192, B32B 104, B32B 3118

Patent

active

039649440

ABSTRACT:
The invention relates to the manufacture of cementitious board, such as gypsum board, faced with paper or other sheets and having an improved accuracy of edge profile. A sheet to be folded at the lateral edges of the board is scored, and quick-setting adhesive, preferably a hot melt adhesive, is applied along the lines of folding. The sheet is then folded to the desired configuration and held until the adhesive has set thus establishing an accurate profile that withstands the action of the aqueous slurry of cementitious material and the application of the other sheet. The invention can be applied to various profiles, including square edge, tapered edge, rebated and tongue-and-groove.

REFERENCES:
patent: 1671084 (1928-05-01), Meyercord
patent: 1750621 (1930-03-01), Brookby
patent: 1846881 (1932-02-01), Lewis
patent: 2213249 (1940-09-01), Kelley
patent: 3241276 (1966-03-01), Vance et al.
patent: 3435582 (1969-04-01), Disney et al.
patent: 3563843 (1971-02-01), Wagers et al.

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