Production of sheet material

Details Production of sheet material Production of sheet material

1981-06-01

1983-08-09

Dawson, Robert A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156322, 156324, 264137, 427316, 427412, 4274342, 428262, 428264, 428265, 428442, 428520, B32B 2712, B32B 3112

Patent

active

043979092

ABSTRACT:
A method of producing sheet material comprises heating a web 10 of closely woven fabric to a temperature of at least 50.degree. C., and preferably to about 150.degree. C., and then impregnating the hot fabric with polyvinylchloride (PVC) paste containing a bonding agent, thereby to provide a material in which the fabric is coated with PVC on each side thereof. Impregnation takes place in a bath 14 with pinch rollers 16 through which the web passes. The pinch rollers 16 squeeze surplus PVC from the web and enhance impregnation. Thereafter the coating can be built up to the desired thickness by dip-coating (in a bath 18) or by a lamination process, whereafter the coated web is cooled in cooling rollers 34 and wound up by a wind-up device 36.

REFERENCES:
patent: 2186183 (1940-01-01), Trumbull
patent: 3562043 (1971-02-01), Eddy
patent: 3632383 (1972-01-01), Dominick et al.
patent: 3740298 (1973-06-01), Swindells
patent: 3809534 (1974-05-01), Palmer
patent: 4332842 (1982-06-01), Litchield et al.
patent: 4341822 (1982-07-01), Singer et al.

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