초록 ▼

Process for producing resin-impregnated fiber tow or strand in the form of prepreg tape which includes unique coating wheels for surface-coating the strand with molten, flowable resin and a kneading section to work the strand and disperse the molten resin uniformly among and between the individual f

Process for producing resin-impregnated fiber tow or strand in the form of prepreg tape which includes unique coating wheels for surface-coating the strand with molten, flowable resin and a kneading section to work the strand and disperse the molten resin uniformly among and between the individual fibers of the strand. The strand, after chilling, has good dimensional stability and is useful as prepreg in forming composite structures.

대표청구항 ▼

A process for preparing prepreg comprising the steps of: (a) conveying and moving lengthwise a continuous fiber strand; (b) engaging and working said strand with a plurality of roll means, spreading the fibers thereof transversely to form a band; (c) conveying said band continuously through rolling

A process for preparing prepreg comprising the steps of: (a) conveying and moving lengthwise a continuous fiber strand; (b) engaging and working said strand with a plurality of roll means, spreading the fibers thereof transversely to form a band; (c) conveying said band continuously through rolling die means and coating the opposing faces of said band with molten, flowable solvent-free resin; (d) engaging the resin-coated band with a plurality of roll means while maintaining said resin in a molten state, thereby kneading the moving band and dispersing the molten resin between the fibers of the band, forming a resin-impregnated band; (e) conveying the resin-impregnated band continuously through the nip opening of a pair of counter-rotating compression roll means while maintaining the resin in a molten state, compressing said band and reducing the thickness thereof to form a resin-impregnated tape; and (f) engaging the resin-impregnated tape with chill roll means, thereby chilling said tape and forming a dimensionally-stable prepreg.