Method for forming preformed material

Details Method for forming preformed material Method for forming preformed material

1989-04-17

1990-08-07

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264324, 264510, 264546, 264549, 264DIG66, 264DIG78, 425390, 425DIG19, 425DIG60, B29C 5120

Patent

active

049466402

ABSTRACT:
A method for the shaping of a sheet of preform material. A flat planar (heated) sheet of preform material is held tightly between two elastomeric sheets, the sheets and preform material forming a laminate assembly. The laminate assembly is then formed about a mold having the desired contours. The elastomeric sheets maintain the preform material parallel to the surface contours of the mold as the molding process proceeds. A fluid such as air is flowed between the mold surface and the laminate assembly during the forming process to prevent the elastomeric sheets from binding on the mold surface. Wrinkles are eliminated in the final shape of the preform material, and fiber distortion of tears or rips in the material are minimized due to the fluid lubrication between the mold surface and the laminate assembly.

REFERENCES:
patent: 2915427 (1959-12-01), Schriner et al.
patent: 2973558 (1961-03-01), Stratton, Jr.
patent: 3305618 (1967-02-01), Sucher et al.
patent: 3407104 (1968-10-01), Crandall
patent: 3492392 (1970-01-01), Kasamatsu et al.
patent: 3933562 (1976-01-01), Cruckshank
patent: 4087224 (1978-05-01), Moser
patent: 4089919 (1978-05-01), Sanson

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