Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1990-07-13
1992-05-19
Robinson, Ellis P.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 43, 428136, 426107, 426113, 2064842, 220203, 220209, 220360, B65B 2522, B65D 5116, B65D 6510
Patent
active
051147661
ABSTRACT:
A package is provided which includes a container having a chamber and provided with an opening which is closed by a multi-layered sheet. The multi-layered sheet is coupled to the container in hermetically sealed relation. The multi-layer sheet includes first and second layers in face-to-face relationship and cooperatively melded to the edge portion of the container. The first layer is adjacent to the container and obturates the opening of the container. The second layer is provided with a slit arrangement defining at least one displaceable flap. The first layer is imperforate and is relatively thin. It responds to a buildup of pressure within the container to rupture and displace the flap in order to vent the container. A third layer is further provided which is connected in face-to-face relationship with the second layer and which is also provided with the aforementioned slit arrangement. The third layer is relatively heat resistant and shape retentive and includes at least one flap in registration with the aforementioned flap. The slit arrangement is, for example, H-shaped, but may also be Z-shaped or U-shaped. Preferably, the first layer is maintained in detached relationship to the second layer in an area encompassing the slit arrangement. The first and third layers are relatively thin in comparison with the second layer.
REFERENCES:
patent: 3997677 (1976-12-01), Hirsch et al.
patent: 4141487 (1979-02-01), Faust et al.
patent: 4210674 (1980-07-01), Mitchell
patent: 4404241 (1983-09-01), Mueller et al.
patent: 4419373 (1983-12-01), Oppermann
patent: 4530440 (1985-07-01), Leong
Nold Charles R.
Robinson Ellis P.
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