Thermoformable lap having reinforcement fibres

a technology of reinforcement fibres and laps, which is applied in the direction of layered products, non-woven fabrics, textiles and paper, etc., can solve the problems of high cost of thermoplastic material powder production
US20140147643A1Inactive Publication Date: 2014-05-29CHOMARAT GILBERT
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
CHOMARAT GILBERT
Publication Date
2014-05-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

A thermoformable lap (1) includes a first web (3) and a second web (4) made of linking fibres (3a, 4a) made of a first thermoreactivatable material having a first reactivation temperature. An intermediate layer (2) is arranged between the first web (3) and the second web (4), and includes reinforcement fibres (2a) and granules (2b) of a second thermoreactivatable material having a second reactivation temperature that is higher than the first reactivation temperature. Certain sections (3b, 4b) of linking fibres of the first and second webs (3, 4) penetrate into the intermediate layer (2) and partially adhere to one another and to the reinforcement fibres (2a) of the intermediate layer (2), ensuring the cohesion of the assembly. Such a lap can be manufactured at a lower cost and at high speed, and can be used for the production of parts by heat moulding.
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Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to the thermoformable laps based on reinforcement fibers and thermofusible or thermoreactivatable material, that can be used to produce parts made of composite material by hot pressing.

[0002] The document U.S. Pat. No. 3,863,758 A discloses a lap based on glass fibers and thermoplastic polymer powder, that can be hot molded. The glass fibers and the thermoplastic polymer powder are mixed and encapsulated between two outer layers whose edges are sealed and which prevent the glass fibers and the powder from escaping. The outer layers are films of thermoplastic polymer compatible with the thermoplastic polymer powder. However, a first drawback is that the very production of the thermoplastic material in powder form is relatively costly. A second drawback is that such known laps with fine powder are sensitive to ageing, and require particular and restrictive storage conditions (short duration, low temperature, absence of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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