Method for punching a sealed package from first and second webs

Details Method for punching a sealed package from first and second webs Method for punching a sealed package from first and second webs

1997-03-03

2000-06-06

Dexter, Clark F.

Cutting

Processes

83 18, 83 55, 83685, 83687, 83945, 83946, 533295, 264153, B65B 6106, B26D 106, B26D 714

Patent

active

060705078

ABSTRACT:
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.

REFERENCES:
patent: 2864221 (1958-12-01), Jones, Jr. et al.
patent: 3580120 (1971-05-01), Adams et al.
patent: 3808927 (1974-05-01), Neil
patent: 3868917 (1975-03-01), Arfert
patent: 4317399 (1982-03-01), Romagnoli
patent: 4913307 (1990-04-01), Takata et al.
patent: 5118002 (1992-06-01), Sugiyama et al.
Patent Abstracts of Japan, vol. 013, No. 090 (M-803), JP 63 281908 (Nov. 18, 1988).

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