Method of making a refrigerator cabinet liner having non-crinkle

Details Method of making a refrigerator cabinet liner having non-crinkle Method of making a refrigerator cabinet liner having non-crinkle

1988-10-07

1990-04-17

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264 468, B29C 6722

Patent

active

049178415

ABSTRACT:
A refrigerator liner of a vacuum formed plastic with a thickness of about 0.007" to 0.050" has each corner formed without crinkling when thermal insulation material is foamed against the outer surface of the liner. The non-crinkling of each corner of the refrigerator liner is accomplished through forming each of the corners with a flat surface having its periphery as a circle during vacuum forming of the refrigerator liner rather than with a spherical radius. This enables the flat surface to be placed in tension when moved against a corresponding flat surface of a foam plug by the pressure produced during foaming of the foamed thermal insulation material. This results in each corner having a central portion with a convex cross section and an outer portion surrounding the central portion and concave in cross section whereby it does not appear to be crinkled.

REFERENCES:
patent: 3122598 (1964-02-01), Berger
patent: 3440308 (1969-04-01), Carbary et al.
patent: 3911190 (1975-10-01), Myers et al.
patent: 3944111 (1976-03-01), Nonomaque et al.
patent: 4535574 (1985-08-01), Dettelbach et al.
patent: 4676938 (1987-06-01), Karklin et al.
patent: 4771532 (1988-09-01), Taylor, Jr. et al.

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