Pressure forming method

Details Pressure forming method Pressure forming method

1971-08-10

1980-03-18

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With mold element formation or removal

264216, 264299, B29D 702

Patent

active

041939590

ABSTRACT:
A method is provided for embossing material, such as plastic, in the form of a sheet under controlled conditions. In one form, embossing takes place while the plastic is confined and compressed between an endless sheet or belt and an extended area of the embossing surface of a drum. Pressure applied to the material being embossed or continuously cast against the drum may be such as to provide for the controlled solidification or setting of the material so as to reduce the shrinkage and warpage thereof and to control the dimensions of the sheet and its surface formations.
In one form, a fluent material such as a molten polymer is forced under pressure between an embossing roll and the surface of a sheet compressed against peripheral or border surfaces of the roll. A dynamic seal is provided between the injector, the embossing or casting roll and the guide sheet. The seal may be partially effected by solidifying border portions of the sheet-like formation of material fed to the apparatus.

REFERENCES:
patent: 2550774 (1951-05-01), Clem
patent: 3230127 (1966-01-01), Cleeremann et al.
patent: 3267191 (1966-08-01), Williams et al.

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