Method and apparatus for making a sealing lip for lid on thermof

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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156 731, 156221, 156293, 156443, 220359, 264320, 425395, B32B 3120

Patent

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046594051

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. This abstract is not to be considered as limiting the claims of the application.

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

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