Apparatus and method for forming foam cushions for packaging pur

Details Apparatus and method for forming foam cushions for packaging pur Apparatus and method for forming foam cushions for packaging pur

1988-08-22

1989-08-08

Culver, Horace M.

Package making

Methods

Applying a partial cover

53451, 53554, 53580, B65B 902, B65B 318

Patent

active

048541095

ABSTRACT:
An apparatus and method is disclosed for successively forming foam filled bags or cushions of the type wherein a foamable composition is deposited in a plastic bag. The method and apparatus includes advancing a pair of plastic webs along a substantially horizontal path of travel and through the nip of a pair of drive rollers, while heat sealing the opposing longitudinal side edges of the webs together. Periodically, a predetermined amount of the foamable composition is deposited between the advancing webs from a position offset from the center of the pair of plastic webs and the heat sealing along the side edges is periodically and momentarily interrupted to form side edge openings for the subsequent escapement of gases generated during foaming. The advance of the webs is momentarily terminated, and a heated wire then engages the webs to sever the formed bag, while forming a sealed top edge of the formed bag and a sealed bottom edge for the next succeeding bag. The advance then again commences, and the cycle is repeated to successively form the foam filled bags. The offset position from which the foamable composition is deposited prevents foamable composition from splashing outside of the bags being formed.

REFERENCES:
patent: 3011934 (1961-12-01), Bursak
patent: 3054236 (1962-09-01), Stroop
patent: 3245197 (1966-04-01), Van Mil, Jr. et al.
patent: 3874146 (1975-04-01), Watkins
patent: 4215524 (1980-08-01), Saylor
patent: 4631905 (1986-12-01), Maloney
patent: 4646510 (1987-03-01), McIntyre
patent: 4674268 (1987-06-01), Gavronsky et al.
patent: 4768330 (1988-09-01), Lane, Jr. et al.

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