METHOD FOR PREPARING A FIBROUS MATERIAL PRE-IMPREGNATED WITH THERMOPLASTIC POLYMER WITH THE AID OF A SUPERCRITICAL GAS
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United States of America Patent
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Dec 1, 2016
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Feb 11, 2015
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Feb 11, 2015
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Abstract
A method to produce a pre-impregnated fibrous material, in particular in ribbon form, including a fibrous reinforcement and thermoplastic polymer matrix, including a step of impregnating the fibrous material in the form of a single roving or several parallel rovings with the polymer in the molten state, the polymer in the molten state at the time of the impregnation containing a neutral gas in the supercritical state used as production aid by reducing viscosity in the molten state, preferably the gas being supercritical CO2.
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