초록 ▼

A package is provided with a lid and container that are heat sealed together. A multi-ply sheet material is provided for being thermoformed to define the container which has a tapering wall and bulge-resistant bottom end. Prior to thermoforming the container from the sheet, the sheet is heated with

A package is provided with a lid and container that are heat sealed together. A multi-ply sheet material is provided for being thermoformed to define the container which has a tapering wall and bulge-resistant bottom end. Prior to thermoforming the container from the sheet, the sheet is heated with oval pads on a plurality of plates which are arranged in a configuration to facilitate control of the sheet temperature. A plug is used in the thermoforming process to contact the sheet and position the sheet within a die. A lid sheet is heat sealed to the container sheet over the thermoformed containers so as to produce a pair of spaced-apart, annular bead heat seals. The package is completed by severing the sealed-together sheets at the periphery of the container with a punch and die set that produces and clean, smooth cut surface.

대표청구항 ▼

[ What is claimed is:] [1.]1. A sealed package comprising:a container having a body comprising a mouth and having a flange around said mouth; anda lid disposed on said container across said mouth and flange, the lid being attached to the flange by a first heat seal and a second heat seal disposed in

[ What is claimed is:] [1.]1. A sealed package comprising:a container having a body comprising a mouth and having a flange around said mouth; anda lid disposed on said container across said mouth and flange, the lid being attached to the flange by a first heat seal and a second heat seal disposed inwardly of the first heat seal, the first heat seal including an annular first bead of a heat-sealable thermoplastic material on the flange and an annular second bead of a heat-sealable thermoplastic material on the lid, said first and second beads being sealed together at the first heat seal, the second heat seal including an annular third bead of a heat-sealable thermoplastic material on the flange and an annular fourth bead of a heat-sealable thermoplastic material on the lid, said third and fourth beads being sealed together at the second heat seal, the lid further being tacked to the flange outwardly of the first heat seal between the first heat seal and an outer edge of the flange.