Method of producing an easily openable multilayer plastic contai

Details Method of producing an easily openable multilayer plastic contai Method of producing an easily openable multilayer plastic contai

1991-10-04

1992-12-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264522, 156 69, 156344, 53456, 53478, B29C 5110, B29C 5114, B29C 5142

Patent

active

051679000

ABSTRACT:
A multilayer container with a flange for sealing with a lid, wherein the thickness of the inner surface layer at the inner edge of the flange is thinner than that in the sealing area, is produced by a method wherein a circular portion of a multilayer sheet to be the flange is held at a certain pressure while the multilayer sheet is being thermoformed under specified molding conditions, with the other portion than the circular portion being stretched. Even a seal ring having an even surface serves as a means for sealing the resulting multilayer container with a lid while ensuring easy openability.

REFERENCES:
patent: 4905838 (1990-03-01), Suzuki

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