Thermoformed pack with ridge valve

Details Thermoformed pack with ridge valve Thermoformed pack with ridge valve

1997-08-27

1998-11-24

Gehman, Bryon P.

Dispensing

Collapsible wall-type container

Nonmetallic

206484, 206820, 222212, 2225416, 222547, 222564, B65D 3700, B65D 3528

Patent

active

058396098

ABSTRACT:
The thermoformed package has a positive sealing ridge valve so that portions of the thermoformed package can be dispensed at different times. There is a relatively thick, shaped bottom sheet and a relatively thin, substantially planar, top sheet. The top sheet is bonded to the shaped bottom sheet around the perimeter of the shaped bottom sheet. At one end of the shaped bottom sheet there is a narrowed region with at least two recesses and a ridge separating the recessed areas. The ridge extends to or above the top surface of the shaped bottom sheet. The top sheet and the ridge cooperate to form a ridge valve to seal the body portion of the thermoformed package from a dispensing opening until a positive force is applied to the body portion. The thermoformed package is opened by the removal of a tab located beyond the recesses and ridge. The recesses and ridge in the shaped bottom sheet and the relatively thin top sheet form an effective sealing valve.

REFERENCES:
patent: 3184121 (1965-05-01), Volckening
patent: 3278085 (1966-10-01), Brown
patent: 3635376 (1972-01-01), Hellstrom
patent: 3862684 (1975-01-01), Schmitt
patent: 4491157 (1985-01-01), Hashimoto
patent: 4759472 (1988-07-01), Strenger
patent: 4872556 (1989-10-01), Farmer
patent: 4890744 (1990-01-01), Lane, Jr. et al.
patent: 4917267 (1990-04-01), Laverdure
patent: 4921137 (1990-05-01), Heijenga
patent: 4928852 (1990-05-01), Guiffray
patent: 5131760 (1992-07-01), Farmer
patent: 5411178 (1995-05-01), Roders et al.
patent: 5529224 (1996-06-01), Chan et al.

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