Process for the welding of plastic films lying flat one on top o

Details Process for the welding of plastic films lying flat one on top o Process for the welding of plastic films lying flat one on top o

1989-03-16

1991-10-22

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156515, 156530, 1565831, B32B 3120

Patent

active

050592700

ABSTRACT:
In a process for the welding of plastic films lying flat, one on top of the other, the plastic films are brought into contact with a heated cutting edge and hot-tool welded. Two-layered or multilayered composite films of different chemical composition are used for the welding; for example, one composite film can be an opaque, colored or uncolored layer, on which there is arranged a transparent sealing layer comprised of a propylene-ethylene copolymer or a propylene-ethylene blend. The sealing layer of the opaque composite film is welded directly to a sealing layer of a second, transparent composite film.

REFERENCES:
patent: 3957569 (1976-05-01), Freitag
patent: 4268338 (1981-05-01), Peterson
patent: 4545844 (1985-10-01), Buchanan
patent: 4692135 (1987-09-01), Johnson

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