Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1979-03-26
1981-01-13
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
2642107, 264230, B29D 2700, B29C 1702
Patent
active
042449006
ABSTRACT:
This invention relates to the treatment of plastic sheet material and especially co-extruded sheet of orientable plastic material which is comprised of film and foam layers which are continuously stretched in a longitudinal direction. The stretching is effected between a pair of rolls which are maintained at different temperatures and rotated at different rates of rotation to effect a cold stretching of the film-foam laminate to improve its shrink capability and lower its shrink temperature upon usage in various packaging applications. A preferred material is polyethylene which is co-extruded into a laminate of film and foam layers and which exhibits improved shrinkage characteristics when employed in the form of tubular sleeves for container labels or bands.
REFERENCES:
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patent: 3855376 (1974-12-01), Ono et al.
patent: 4038446 (1977-07-01), Rhoads
patent: 4071597 (1978-01-01), Karabedian
Pearson, J. R. A. "Mechanical Principles of Polymer Melt Processing", New York, Pergamon Press, .COPYRGT.1966, pp. 123-126.
Anderson Philip
Click M. E.
Holler E. J.
Owens--Illinois, Inc.
Wilson D. H.
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