Abstract: A fiber-reinforced thermoplastic composite comprising a fiber reinforcement, a first thermoplastic polymer about said fiber reinforcement, and a second thermoplastic polymer interposed between said fiber reinforcement and said first thermoplastic polymer; said second thermoplastic polymer being different from and compatible with said first thermoplastic polyer and capable of wetting said fiber reinforcement; and to the process of making such composite.

Abstract: In the process for manufacturing thermoplastic polymer articles reinforced with long continuous fibers by pultrusion, including impregnating tufts of fibers with thermoplastic resin, circulating an assemblage of said impregnated tufts in a heat assembly so as to melt the resin, and then hot shaping the article in an appropriate die to give it essentially its final shape before passing it through a second cooling die, the improvement including compressing the assemblage of impregnated tufts in the heated assembly consisting essentially of a flat die having an inlet zone and an exit zone, the inlet being wide enough to allow the initial volume of the impregnated tufts to pass through and a horizontal gap adapted to be varied in thickness, and allowing the emerging assembly of impregnated tufts to be brought to the shape of a sheet of minmimium thickness before shaping, and the flat die and rigid polyvinyl chloride article prepared by the process.

Abstract: A fiber-reinforced thermoplastic composite comprising a fiber reinforcement, a first thermoplastic polymer about said fiber reinforcement, and a second thermoplastic polymer interposed between said fiber reinforcement and said first thermoplastic polymer; said second thermoplastic polymer being different from and compatible with said first thermoplastic polymer and capable of wetting said fiber reinforcement; and to the process of making such composite.

Abstract: An apparatus for the manufacture of sections of thermoplastic resin reinforced with continuous fibers. The apparatus includes coating rovings, having their fibers previously arranged in the form of a sheet by passage through a baffle zone having at least one transverse baffle, in a coating zone fed with a molten thermoplastic, then, to ensure impregnation of each of the fibers of the rovings, the coated rovings are passed into a forced impregnation zone having at least two baffles parallel to the baffle in the baffle zone prior to passing into the channel for shaping the final product.

Abstract: A process is provided for producing thermoplastic resins reinforced with long fibers in which rovings are impregnated with a wetting thermoplastic polymer by means of a die and a baffle zone, then taking up the impregnated rovings in a second die where they are then covered with a thermoplastic polymer.

Abstract: In the process for the manufacture of a polyamide composite material reinforced with long fibers, the improvement comprising impregnating the fibers with a polyamide oligomer or prepolymer, heat-treating the impregnated fiber to increase the length of the polymer chain, and then shaping the impregnated fiber by pultrusion.

Abstract: The invention is a process for the manufacture of sections of thermoplastic resin reinforced with continuous fibers and the equipment for carrying out the process. The process consists of coating rovings, having their fibers previously arranged in the form of a sheet, in a coating zone fed with a molten thermoplastic, then, to ensure impregnation of each of the fibers of the rovings, the coated rovings are passed into a forced impregnation zone prior to passing into the channel for shaping the final product.