Method for forming double-walled units

Details Method for forming double-walled units Method for forming double-walled units

1974-08-28

1976-07-27

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156224, 156229, 156494, 264 88, 264 92, 264164, 425387B, B32B 3100

Patent

active

039716872

ABSTRACT:
A method of forming a double-walled unit from thermoplastic materials, preferably polymethyl methacrylate, in which two sheets, one of which is provided with an aperture to allow the passage of air between the sheets, are stretched apart under thermoforming conditions by imposed pressure differences, the desired spatial relationship between the sheets being obtained by adjustment of the pressure differences, and in which the sheets are simultaneously bonded about their perimeters.

REFERENCES:
patent: 1310439 (1919-07-01), Roberts
patent: 2142445 (1939-01-01), Helwig
patent: 2448173 (1948-08-01), Cowan
patent: 2564656 (1951-08-01), Chedister
patent: 2599554 (1952-06-01), Howenstine
patent: 3140325 (1964-07-01), Graff
patent: 3281301 (1966-10-01), Bolesky
patent: 3390482 (1968-07-01), Holtvoigt
patent: 3616197 (1971-10-01), Amberg

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