All-plastic heat-sealable container material and method of makin

Details All-plastic heat-sealable container material and method of makin All-plastic heat-sealable container material and method of makin

1976-07-02

1978-11-21

Dixon, Jr., William R.

Envelopes, wrappers, and paperboard boxes

Wrapper

Bottle

428 36, 428 12, 428 57, 428129, 428215, 428516, 264173, B65D 572, B32B 304

Patent

active

041262620

ABSTRACT:
The invention provides a dynamic system for heat-sealing an all-plastic material in a continuous process at high speed. The invention includes an all-plastic heat-sealable container material comprising a multiple-layer composite, in sheet form, including a core layer and at least one outer layer on one side thereof. The layers preferably comprise thermoplastic material, the core layer material having a higher softening point than the outer layer material. The composite sheet is conveyed through a converting, side-seaming or other apparatus at high speed, the system being tuned to dynamically heat the outer layers to a molten state for heat sealing, while the core does not soften but remains undistorted. The core is thus thermally insensitive to heat at speeds used in side-seaming the composite, and as such it supports and maintains the structure of the sealing outer layers on its exterior while they are in a molten condition.

REFERENCES:
patent: 2956723 (1960-10-01), Tritsch
patent: 3110611 (1963-01-01), Powelson
patent: 3120333 (1964-02-01), Seiple
patent: 3162349 (1964-12-01), Kelly
patent: 3223761 (1965-12-01), Raley
patent: 3389849 (1968-06-01), Egleston
patent: 3589976 (1971-06-01), Erb
patent: 3595735 (1971-07-01), Tyrrell
patent: 3939976 (1976-02-01), Mayworm
patent: 3979048 (1976-09-01), Stark et al.

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