Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
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.
Maeda Hiroshi
Odaka Hiroshi
Takahashi Hiroyuki
Yamada Toyokazu
Idemitsu Petrochemical Co. Ltd.
Nold Charles R.
Robinson Ellis P.
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