Sheet films, packaging materials, and packaging using the same h

Details Sheet films, packaging materials, and packaging using the same h Sheet films, packaging materials, and packaging using the same h

1997-07-24

2000-05-30

Dye, Rena L.

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

428 357, 428138, 426107, 426118, 426127, 383103, B65D 3301

Patent

active

06068898&

ABSTRACT:
A film sheet having a pressure valve portion with one or more holes passing partially through the sheet film on one side of the sheet film, and a thin portion covering each of the one or more holes. The thin portion is preferably constructed to rupture when a predetermined maximum sustainable pressure differential is applied across the sheet film. In one embodiment, sheet film has a first film layer; and a second film layer, having one or more through holes, laminated to the first film layer. In another embodiment, the sheet film has a first film layer, a second film layer having one or more through holes, and a third film layer having one or more through holes, wherein the second film layer is laminated on one side of the first film layer, and the third film layer is laminated on the other side of the first film layer so that the one or more through holes of the second film layer are aligned with the one or more through holes of the third film layer. The sheet film can be used to make sealed packages for containing foods and beverages.

REFERENCES:
patent: 3507443 (1970-04-01), Coerard
patent: 3628720 (1971-12-01), Schmedding
patent: 3659584 (1972-05-01), Doyle et al.
patent: 4134535 (1979-01-01), Barthels et al.
patent: 4371080 (1983-02-01), Haines
patent: 4404241 (1983-09-01), Mueller et al.
patent: 4689936 (1987-09-01), Gaikema et al.
patent: 4834247 (1989-05-01), Oshima et al.
patent: 4899976 (1990-02-01), Cederoth et al.
patent: 5012061 (1991-04-01), Lesser
patent: 5326176 (1994-07-01), Domke
patent: 5387781 (1995-02-01), Berkoff
patent: 5587192 (1996-12-01), Beizermann

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