Method for heat sealing polyester film

Details Method for heat sealing polyester film Method for heat sealing polyester film

1973-12-18

1976-07-13

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156272, 156311, 156499, 428480, B32B 3126, B32B 3128

Patent

active

039691764

ABSTRACT:
A flexible heat set biaxially oriented film article having in at least one portion thereof a bead type heat seal is prepared by clamping together adjacent the portion to be heat sealed, superimposed plies of a heat set, biaxially oriented polyester film, said film being characterized as having a tensile strength of at least 15,000 psi and a ratio of tensile strengths in the TD to MD direction between about 0.67 and 1.5, imposing a heat energy source to fuse in a bead type seal the superimposed film and maintaining the plies of film pressed together until the source of heat energy is retracted therefrom.

REFERENCES:
patent: 3009851 (1961-11-01), Madsen
patent: 3165499 (1965-01-01), Alles
patent: 3321353 (1967-05-01), Zelnick
patent: 3355337 (1967-11-01), Zelnick
patent: 3413175 (1968-11-01), Rochla
patent: 3574046 (1971-04-01), Buteux
patent: 3736219 (1973-05-01), McTaggart

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