Method of forming closure liners

Details Method of forming closure liners Method of forming closure liners

1974-07-25

1978-03-28

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264294, 264296, B29D 3100

Patent

active

040815030

ABSTRACT:
Container closures are given the customary sealing gasket of plastics material by a two stage deformation of a pellet of the plastics material. In a first stage the material is partly deformed and is heated by direct conduction from a heated deforming member, and in the second stage a relatively cool final moulding die effects further deformation to impart the desired finished configuration to the gasket. The pressure member, and possibly also a workpiece support on which the upturned closure rests, is heated by means of a radiant heat source directing radiant heat onto a blackened roughened surface of the pressure member, and the workpiece support where applicable. The pressure member has a low-adhesion surface of polytetrafluoroethylene.

REFERENCES:
patent: 2546085 (1951-03-01), Briscoe
patent: 2688776 (1954-09-01), Evans
patent: 3135019 (1964-06-01), Aichele
patent: 3509252 (1970-04-01), Baehr

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