Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Perforation by differential fluid pressure; or smoothing,...
Patent
1980-09-29
1985-01-29
Parrish, John A.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Perforation by differential fluid pressure; or smoothing,...
264145, B32B 3118
Patent
active
044965150
ABSTRACT:
Gypsum board is formed into a continuous sheet by depositing an aqueous slurry of calcium sulfate hemihydrate, including conventional additives, between two paper cover sheets on a moving conveyor. After the slurry has reached the initial stiffening degree of set and before the slurry has reached a final or temperature rise set, and in the preferred form before it has reached a Vicat set, the moving sheet is transversely cut into individual boards by means of a high pressure and velocity fluid cutting jet. Since the cutting may be carried out before the Vicat set is reached, the board line may be operated at an increased velocity, thereby enabling a particular board line materially to increase its production within a given period of time and to use conveying equipment which is shorter in length.
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Mustoe Robert M.
Ptasienski Mitchell P.
Zajonc, deceased Fred H.
Didrick Robert M.
Kurlandsky Samuel
Parrish John A.
Robinson Robert H.
United States Gypsum Company
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