Integrally shaped crosslinked polymer foam box

Details Integrally shaped crosslinked polymer foam box Integrally shaped crosslinked polymer foam box

1995-04-13

2000-03-28

Shoap, Allan N.

Receptacles

Sectional

Container formed of only two similar sections

220 424, 220 6222, 220839, B65D 122, B65D 4316

Patent

active

060419571

ABSTRACT:
A one-piece box for storing small objects, molded from a flexible polymer foam material comprising an integrally formed bottom section, cover and hinge, characterized in that the hinge section is resilient and is capable of repeated articulation, said hinge section comprising compressed foam having a density of greater than that of the bottom and cover sections, and wherein the bottom section and cover contain means for sealingly engaging said bottom and cover sections. In method form, the method comprises supplying a sheet of crosslinked polymer foam of thickness x, heating said sheet to a temperature sufficient to substantially uniformly heat the entire cross-section of said foam sheet, and placing said heated sheet into an unheated compression mold containing a hinge forming section of essentially zero tolerance and forming said box under a compression pressure sufficient to reduce the thickness x of the polymer foam sheet by a factor of about 15 at the hinge section.

REFERENCES:
patent: 4298133 (1981-11-01), Davis
patent: 4382536 (1983-05-01), Congleton
patent: 4552708 (1985-11-01), Kimura et al.
patent: 4848543 (1989-07-01), Doboze
patent: 4885820 (1989-12-01), Erceg et al.
patent: 5183159 (1993-02-01), Hojnacki et al.
patent: 5555671 (1996-09-01), Voight et al.
patent: 5564623 (1996-10-01), Kiley

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