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US 4,857,379 AGranted
Sheetlike structure of fibers, especially as a reinforcement for plastics components
AssigneeVerseidag Industrietextilien GmbH
InventorsMargret Plontges, Herbert Cox
Life of this patent
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Abstract
A sheetlike structure of fibres is provided, useful as a reinforcement for plastic components. A plurality of threads are arranged in the warp and weft directions, and some of the threads are made of a material which shrinks when subjected to heat treatment at a temperature below its melting point and which substantially regains its original strength after being subjected to heat shrinking and cooling.
Claims9
A sheetlike structure of fibres comprising:
- a plurality of threads arranged in directions crossing each other and in intimate contact with a plastic material which they reinforce, wherein at least some of the threads comprise a material which shrinks when subjected to heat treatment at a temperature below its melting point and which substantially regains its original strength upon cooling after being subjected to heat shrinking, whereby at least some of the threads, after heat shrinking, are prestressed in said plastic.
A pre-stressed reinforced plastic sheet comprising:
- a sheetlike structure of fibres having a plurality of high tenacity threads arranged in groups crossing each other
- a plastic material impregnated by heat into said sheetlike structure,
- at least some of the threads comprising a material which shrinks when subjected to heat at a temperature of impregnation with said plastic material and which substantially regains its original strength upon cooling after said heat shrinking.
- said plastic sheet after cooling being pre-stressed and reinforced under tension by the shrunken fibres.
1 more element
Dependencies are inferred from the claim text.