Stock material or miscellaneous articles – Composite – Of polyamide
Patent
1992-10-14
1995-08-22
Ryan, Patrick J.
Stock material or miscellaneous articles
Composite
Of polyamide
296 971, 296 972, 296 978, 296 98, 156229, 160237, 1603741, 160370A, 160120, 428906, B41M 312
Patent
active
054439230
ABSTRACT:
The invention provides a multilayer plastic sheet of self-rollable material comprising at least two layers of material joined to one another at states of different relative stretch and capable of alternating between a relaxed and a tensioned state and of inherently assuming a rolled-up configuration in said relaxed state as a result of the different states of stretch of the respective layers and to retain said inherent property of spontaneous rolling up even after prolonged exposure to sunlight and heat. The invention also provides a process for preparing a rollable sheet containing at least one layer of laminatable plastic material, said sheet being capable of alternating between a relaxed and a tensioned state and of inherently assuming a rolled up configuration in said relaxed state and retaining said inherent property of spontaneous rolling up even after prolonged exposure to sunlight and heat, said process comprising heating and stretching a first sheet of plastic material and laminating said first sheet of prestretched plastic material to a second sheet of non-stretched material, to form a self-rollable composite sheet.
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patent: 4615922 (1986-10-01), Newsome et al.
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patent: 5176774 (1993-01-01), Laniado et al.
Har-El Moshe
Laniado Josephe
Dixon Merrick
Roll-Screens, Inc.
Ryan Patrick J.
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