Multilayer plastics containers and methods of producing the same

Details Multilayer plastics containers and methods of producing the same Multilayer plastics containers and methods of producing the same

1990-10-25

1992-11-24

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 359, 428192, 428121, 220356, 220359, B32B 706, B65D 7720

Patent

active

051659743

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 et al.

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