Toray Industries, Inc.

Reo Takaiwa

Ichiro Taketa

A towpreg that is easy to unwind from a bobbin, has good width accuracy after unwinding and can produce a composite material with excellent heat resistance, and a resin composition that gives such a towpreg. A towpreg is characterized by being impregnated with an epoxy resin that contains an epoxy resin which is solid at 23° C. in an amount of 30 parts or more in 100 parts by mass of total epoxy resin components, contains a polyfunctional amine type epoxy resin which is liquid at 23° C. in an amount of 20 parts or more in 100 parts by mass of total epoxy resin components, and further contains a clay mineral.

Resin composition for carbon fiber composite material, towpreg

The present invention relates to a method for producing a towpreg by impregnating a plurality of fiber bundles with a resin to form a single towpreg, characterized in that the method comprises providing a stock of fiber bundles for preparing a towpreg; measuring a basis weight for each of the fiber bundles of said stock before impregnation by a resin; defining groups of fiber bundles from said stock based of the fiber basis weight, thereby providing determined fiber bundles; predicting a fiber basis weight of a towpreg when the plurality of fiber bundles is combined to form the towpreg, thereby providing a predicted fiber basis weight of a towpreg; and producing the towpreg using a combination of fiber bundles from all groups of determined fiber bundles in which the predicted fiber basis weight of the towpreg is in a range determined from a target value of a basis weight of a towpreg.

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PAU, France

Reo Takaiwa