Patent ID: 6270851
Filing Date: 2001-08-07
Classification: B29B,B29C

Abstract:
A process for preparing a resin coated fiber composite of a rod-shape, tubular-shape or plate-shape, a plurality of fiber filaments being continuously coated in a manner of alternating sequence through a relatively narrow flow path of a zigzag shaped tunnel formed between an inner die member and an outer die member, the process comprising steps of:spreading said plurality of fiber filaments by passing said fiber filaments through a first member having a convex-concave portion of a semi-circular ring shaped internal surface to prevent fracture of said fiber filaments, and sequentially, by tensioning through a series of second members having a semi-circular ring shaped external surface and the first member having the semi-circular ring shaped internal surface all along the relatively narrow flow path of the zigzag shaped tunnel to maximize molten resin penetrating surface area;impregnating pressurized molten resin into said plurality of widely spread fiber filaments continuously by passing said fiber filaments through said series of the first and second members all along the relatively narrow flow path of the zigzag shaped tunnel to maximize molten resin penetrating time, wherein said pressurized molten resin is filled in the relatively narrow flow path of the zigzag shaped tunnel, supplied from a plurality of resin inlet ports disposed at a center surface section of the outer die member, and exerted toward both ends of inlet and outlet nozzles, and wherein pressurization of the molten resin maximizes penetrating the molten resin into pores of the fiber filaments and minimized possibility of resin degradation;stranding a plurality of resin-coated fiber filaments continuously by passing through a final set of the first member having the convex-concave portion of the semi-circular ring shaped internal surface for strengthening the fiber filaments; andintegrating and pultruding said plurality of resin-coated fiber filaments continuously by passing along the relatively narrow flow path of the zigzag shaped tunnel to form a desired diameter through the outlet nozzle.