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US 5,176,774 AGranted
Processes for manufacturing multilayer plastic sheet
AssigneeRoll Screens, Inc.
InventorsJosephe Laniado, Moshe Har-El
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AssigneeRoll Screens, Inc.
InventorsJosephe Laniado, Moshe Har-El
Estimating the term…
The invention provides a multilayer plastic sheet of self-rollable maerial 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.
A process for preparing a multi-layer self-rollable plastic sheet for protecting the interior of a motor vehicle against sunlight and/or heat containing at least two layers of laminatable plastic material joined to one another at states of different relative stretch, said sheet being capable, upon human prompting, of alternating between a relaxed and a tensioned state and being pretreated to inherently a rolled-up configuration around an axis in said relaxed state as a result of the different states of stretch of the layers and being further pretreated to retain said inherent property of spontaneous rolling up even after prolonged exposure to sunlight and heat, said process comprising
A process for preparing a multi-layer self-rollable plastic sheet for protecting the interior of a motor vehicle against sunlight and/or heat containing at least two layers of laminatable plastic material joined to one another at states of different relative stretch, said sheet being capable, upon human prompting of alternating between a relaxed and a tensioned state and being pretreated to inherently assume a rolled up configuration around an axis in said relaxed state as a result of the different states of stretch of the layers and being further pretreated to retain said inherent property or spontaneous rolling up even after prolonged exposure to sunlight and heat, said process comprising
A process for preparing a self-rollable sheet containing at least a first layer of laminatable plastic material, the 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, the process comprising:
In a process of preparing a multi-layer self-rollable plastic sheet containing at least two layers of laminatable plastic material joined to one another at states of different relative stretch said sheet being capable, upon human prompting, of alternating between a relaxed and a tensioned state and being pretreated to inherently assume a rolled up configuration around an axis in said relaxed state as a result of the different states of stretch of the layers and being further pretreated to retain said inherent property of spontaneous rolling-up even after prolonged exposure to sunlight and heat, the process comprising heating and stretching a first sheet of plastic material, laminating the first sheet of prestretched plastic material to a second sheet of relatively non-stretched plastic material to form a self-rollable composite sheet which will roll up along the direction of stretch of the first sheet and assume the relaxed state allowing the laminated sheet to roll onto itself, and cooling the heated sheet to effect a tightening of the rolling effect of the composite sheet, the improvement comprising
In a process of preparing a multi-layer self-rollable plastic sheet containing at least two layers of laminatable plastic material joined to one another states of different relative stretch said sheet being capable, upon human prompting, of alternating between a relaxed and a tensioned state and being pretreated to inherently assume a rolled-up configuration around an axis in said relaxed state as a result of the different states of stretch of the layers and being further pretreated to retain said inherent property of spontaneous rolling-up even after prolonged exposure to sunlight and heat, the process comprising heating and stretching a first sheet of plastic material, laminating the first sheet of prestretched plastic material to a second sheet of relatively non-stretched plastic material to form a self-rollable composite sheet which will roll-up along the direction of stretch of the first sheet and assume the relaxed state allowing the laminated sheet to roll onto itself, and cooling the heated sheet to effect a tightening of the rolling effect of the composite sheet, the improvement comprising
Dependencies are inferred from the claim text.