Thermoformable lap having reinforcement fibres
A technology for reinforcing fibers and forming sheets, applied in the field of thermoformable sheets, can solve the problems of expensive production of thermoplastic materials and easy aging of sheets.
Inactive Publication Date: 2014-03-05
吉尔伯特·肖马拉
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Problems solved by technology
However, the first disadvantage is that thermoplastic production itself is relatively expensive
The second disadvantage is that the known flakes with fine powder are prone to aging and require special and strict storage conditions (short-term storage, low temperature, no UV light, etc.)
A third disadvantage is that the plies can only be cut along the preformed joining line along which the outer layers are sealed to each other
Method used
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[0041] As shown in the figures, the thermoformable sheet 1 according to the invention comprises an intermediate layer 2 arranged between a first web 3 and a second web 4 .
[0042] Said intermediate layer 2 comprises reinforcing fibers 2a and particles 2b of a second thermally reactivatable material.
[0043] Said first web 3 and said second web 4 are made of connecting fibers 3a and 4a respectively, at least the surfaces of said first and second webs are made of a first thermally reactivatable material .
[0044] The first thermally reactivatable material forming said connecting fibers 3a and 4a has a first reactivation temperature T1 of approximately between 110°C and 135°C.
[0045] Said second thermally reactivatable material in the form of particles 2b has a second thermally reactivatable temperature T2 higher than said first thermally reactivatable temperature T1.
[0046] Certain segments 3b and 4b of the connecting fibers of the first web 3 and the second web 4 protr...
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Abstract
The invention relates to a thermoformable lap (1) which 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 comprises 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.
Description
technical field [0001] The present invention relates to thermoformable sheets based on reinforcing fibers and heat-fusible or heat-reactivatable materials, which can be used for the manufacture of composite parts by hot pressing. Background technique [0002] Document US3863758A discloses a sheet based on glass fibers and thermoplastic polymer powder, which can be thermomoulded. The glass fiber and thermoplastic polymer powder are mixed and enclosed between two outer layers with sealed edges that prevent the glass fiber and thermoplastic polymer powder from escaping. The outer layer is a thermoplastic polymer film compatible with the thermoplastic polymer powder. However, a first disadvantage is that the thermoplastic material itself is relatively expensive to produce. A second disadvantage is that the known flakes with fine powder are prone to aging and require special and strict storage conditions (short-term storage, low temperature, no UV light, etc.). A third disadva...
Claims
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IPC IPC(8): D04H1/48B29C70/00D04H1/485D04H1/4218D04H1/4374D04H1/413
CPCD04H1/48D04H1/4218B29C70/50D04H1/4374D04H1/485D04H1/413Y10T428/24942
Inventor 吉尔伯特·肖马拉
Owner 吉尔伯特·肖马拉