Slit sealing method and apparatus

Details Slit sealing method and apparatus Slit sealing method and apparatus

1986-01-09

1987-08-18

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156259, 156271, 156515, B32B 3118

Patent

active

046875328

ABSTRACT:
A method and apparatus for slit sealing thermoplastic materials, primarily linear low density polyethylene, either alone or with coextrusions of other materials. The material is passed over a presealing roll, and the area to be slit is presealed using heated air. Very quickly after the presealing, the material is slit with a heated knife blade, the slit edges being sealed by dragging along the sides of the heated blade. The cutting edge of the blade is angled to roll a bead upwardly on the material, and the slit edges are held taut and separated by an edge holding device.

REFERENCES:
patent: 2587685 (1952-03-01), Bergstein
patent: 3156010 (1964-11-01), Osborn
patent: 4070222 (1978-01-01), Olson
patent: 4259134 (1981-03-01), Joice et al.
patent: 4308087 (1981-12-01), Johnson
patent: 4318768 (1982-03-01), Johnson
patent: 4396449 (1983-08-01), Tumminia

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