Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1982-12-10
1985-04-30
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264322, 264325, 264DIG66, B29G 500
Patent
active
045143544
ABSTRACT:
A method of forming pressed paperboard and pressed paperboard articles from a cellulosic fiber pulp, wherein the paperboard or paperboard articles has improved high temperature properties required of ovenable cookware. A preformed sheet or blank formed from a cellulosic fiber pulp, and having a water content in a range of from about 50% to about 100% by weight, is placed in an unheated press or mold to form the sheet or blank at a pressure in the range of from about 160 psi to about 2600 psi and then dried. When compared with hot press dried paperboard or shaped paperboard articles, such as ovenable baking trays, the products of the method of this invention have superior burst strengths after exposure to a temperature of 450.degree. F. (232.degree. C.) for one hour.
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Cerenzia Walter S.
Schlesinger Sheldon I.
Wilson Thomas D.
Aguele William A.
Hargis, III Harry W.
James River--Norwalk, Inc.
McGurk Mike
Whaley Thomas H.
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