Heating of a foam cup to increase stiffness

Details Heating of a foam cup to increase stiffness Heating of a foam cup to increase stiffness

1988-05-27

1989-11-07

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 83, 220902, 229 15B, 264321, 428913, B32B 3126

Patent

active

048789704

ABSTRACT:
The method of improving the stiffness of a polystyrene foam cup having a generally closed cell foam sidewall and bottom and a solid plastic film coating on at least the outer surface thereof comprising placing said cup around a heated mandrel, said mandrel having an outside diameter sufficiently less than an inside diameter of said cup to allow the cup sidewall to expand, at a temperature and for a time sufficient to expand the sidewall.

REFERENCES:
patent: 3344222 (1967-09-01), Shapiro et al.
patent: 3616020 (1971-10-01), Whelan et al.
patent: 3669794 (1972-06-01), Mazur
patent: 3967991 (1976-07-01), Shimano et al.
patent: 4359160 (1982-11-01), Myers et al.
patent: 4547412 (1985-10-01), Schneider et al.
patent: 4579275 (1986-04-01), Peelman et al.

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