Sealing lip for lid on thermoformed container

Details Sealing lip for lid on thermoformed container Sealing lip for lid on thermoformed container

1985-08-16

1986-06-17

Hall, George T.

Receptacles

Closures

Removable closure retained by adhesive or fusion means

220266, B65D 4100

Patent

active

045951179

ABSTRACT:
This relates to the forging of web-like portions of components so as to increase the density thereof and to shape the material for various purposes. In one form of the invention forging is utilized to form an upstanding sealing rib without a material orientation of the plastic which would result in distortion of the material should it be subjected to retorting. In another form of the invention forge tooling is utilized to provide an element with a hinge strip wherein the core material is compressed without an undue internal stressing of the core material. Most particularly, the tooling is heated to provide a softening of the skin surfaces of the material thereby permitting relative movement of the material which is being forged with respect to the tooling and thereby an internal compressing of the material without shear stresses being developed therein.

REFERENCES:
patent: 4044941 (1977-08-01), Knudsen
patent: 4207989 (1980-06-01), Ingemann
patent: 4215797 (1980-08-01), Chen

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