Process for producing a heat-weakened strip in polyolefin film

Details Process for producing a heat-weakened strip in polyolefin film Process for producing a heat-weakened strip in polyolefin film

1979-10-18

1981-05-05

Camby, John J.

Heating

Processes of heating or heater operation

Continous strip, strand or web passed longitudinally through...

219384, 219388, F27B 928

Patent

active

042656168

ABSTRACT:
A continuous process for forming a longitudinal heat-weakened strip in a cross-lapped oriented polyolefin film is disclosed. The process comprises directing heat from two longitudinally aligned sources, to opposing sides of a travelling web of the cross-lapped oriented polyolefin film, to such an extent that the tensile breaking strength at the heat-weakened strip so formed is in the range of 20 to 100 Newtons per centimeter of length of film. The film so formed is particularly useful for packaging slurry explosives.

REFERENCES:
patent: 2630519 (1953-03-01), Gard
patent: 4070222 (1978-01-01), Olson

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