초록 ▼

A method for supplying a prepreg having substantially no excess resin while at the same time having an aggressive tack. Small discrete amounts of additional resin are selectively applied to a surface of the prepreg sheets in a regular array. The resin is applied at a sufficient viscosity that it doe

A method for supplying a prepreg having substantially no excess resin while at the same time having an aggressive tack. Small discrete amounts of additional resin are selectively applied to a surface of the prepreg sheets in a regular array. The resin is applied at a sufficient viscosity that it does not sink into the prepreg fabric. The additional resin typically covers less than 25% of the surface and constitutes between 0.1% and 3% of the prepreg weight. The additional resin may be applied by a gravure roller having a surface etched with an appropriate array of indentations. A doctor blade partially defines a reservoir of resin in contact with a portion of the gravure roller and wipes the surface, thereby leaving resin only in the indentations. The doctor blade may be oscillated parallel to the roller axis to prevent accumulations of short fibers from impairing the wiping action.

대표청구항 ▼

A method for forming an article from a resin impregnated fabric, the fabric comprising a multitude of individual filaments distributed over the entire area of the fabric, the method comprising the steps of: impregnating the fabric with an amount of resin which is less than the desired total amount o

A method for forming an article from a resin impregnated fabric, the fabric comprising a multitude of individual filaments distributed over the entire area of the fabric, the method comprising the steps of: impregnating the fabric with an amount of resin which is less than the desired total amount of resin in the finished article, so that substantially the entire resin is absorbed into the fabric; thereafter depositing on at least one surface of the impregnated fabric an amount of resin which represents the difference between the desired amount of resin in the finished article and the amount of resin previously impregnated into the fabric by depositing the resin difference at a multitude of individual, spaced apart areas substantially equally distributed over the surface of the fabric in such a manner that the resin difference remains on that surface and renders the surface relatively tacky; thereafter placing the fabric into a mold so that the relatively tacky surface of the fabric faces a shaping surface of the mold; adhering the fabric to the shaping surface with the relatively tacky surface of the fabric; and thereafter subjecting the impregnated fabric while disposed in the mold to the required heat and pressure to conform the fabric to the shaping surface, to cause the total amount of resin to distribute itself substantially uniformly throughout the fabric, and to cure the resin and thereby finish form the article.