Method of forming a sporting implement
A method of forming a sporting implement includes placing a plurality of fibers in a cavity formed in a first portion of a mold, the mold having an inlet and an outlet. A second portion of the mold is positioned in contact with the first portion such that the cavity cooperates with the second portion of the mold to define a chamber. A first material is mixed with a second material to form a thermoplastic resin. The thermoplastic resin is injected into the chamber through the inlet. The inlet and outlet are closed, and the thermoplastic resin completely polymerizes so as to form a fiber reinforced sporting element in the chamber, and the sporting element is removed from the chamber.
1 . A method of forming a sporting implement comprising:
pulling a plurality of bundles of fiberglass or carbon fibers from a plurality of spools and a first mat of fibers from a first spool positioned above the bundles and a second mat of fibers from a second spool positioned below the bundles to form a precursor;
pulling the precursor through a guide of a pultrusion device, the guide having a predetermined profile which forms the precursor with a closed and hollow cross-section;
pulling the precursor through a resin impregnator in which resin is injected into the precursor at a first temperature;
pulling the precursor through a preformer;
pulling the precursor through a heated die at a second temperature higher than the first temperature, the heated die curing the precursor so as to form a continuous linear member; and
cutting the continuous linear member into a sporting element having a predetermined length.
2 . The method of claim 1 , wherein at least one reciprocating pulling device pulls the precursor.
3 . The method of claim 1 , wherein the mat is formed of glass fibers.
4 . The method of claim 1 , wherein the mat is formed of one of a tri-axial fabric having fibers oriented at 0°, +45°, and −45° with respect to a longitudinal axis of the mat, and a biaxial fabric having fibers oriented at +45° and −45° with respect to a longitudinal axis of the mat.
5 . The method of claim 1 , wherein the resin is a liquid thermoplastic resin.
6 . The method of claim 1 , wherein a saw is used to cut the continuous linear member.
7 . The method of claim 1 , wherein the first temperature at which the resin is injected at approximately 70° C.
8 . The method of claim 1 , wherein a first portion of the heated die is approximately 85° C., a second portion of the heated die positioned downstream of the first portion is approximately 95° C., and a third portion of the heated die positioned downstream of the second portion is approximately 105° C.
9 . The method of claim 1 , wherein the guide provides the precursor with a rectangular cross-section.
10 . The method of claim 1 , wherein the preformer provides the precursor and surfacing material with a rectangular cross-section.
11 . The method of claim 1 , wherein the mat is pulled from a spool.
12 . The method of claim 1 , further comprising
pulling a second plurality of fiberglass fibers and a second mat through the guide to form a second precursor around an internal mandrel;
pulling the second precursor through the resin impregnator in which resin is injected into the second precursor, wherein the mandrel is located in a middle of a cavity in the resin impregnator;
pulling a second surfacing material and the second precursor through the preformer downstream of the resin impregnator;
pulling the second precursor through the heated die, the heated die curing the second precursor so as to form a second continuous linear member, wherein the mandrel extends to a position upstream of an end of the heated die; and
cutting the second continuous linear member into a second sporting element having a predetermined length.
13 . The method of claim 1 wherein the resin impregnator comprises injection ports positioned at a top and a bottom of the resin impregnator.
14 . The method of claim 1 wherein the first temperature is room temperature.
15 . A method of forming a sporting implement comprising:
pulling a plurality of bundles of fiberglass or carbon fibers from a plurality of spools and a first mat of fibers from a first spool positioned above the bundles and a second mat of fibers from a second spool positioned below the bundles to form a precursor;
pulling the precursor through a guide of a pultrusion device, the guide having a predetermined profile which forms the precursor with a closed and hollow cross-section;
pulling the precursor through a resin impregnator in which resin is injected into the precursor at a first temperature;
pulling the precursor through a heated die wherein a first portion of the heated die is heated to a second temperature higher than the first temperature, a second portion of the heated die positioned downstream of the first portion is heated to a third temperature higher than the second temperature, and a third portion of the heated die positioned downstream of the second portion is heated to a fourth temperature higher than the third temperature, the heated die curing the precursor so as to form a continuous linear member; and
cutting the continuous linear member into a sporting element having a predetermined length.
16 . The method of claim 15 wherein the resin impregnator is positioned upstream of the heated die.
17 . The method of claim 15 wherein the resin impregnator comprises injection ports positioned at a top and a bottom of the resin impregnator.
18 . The method of claim 15 wherein the first temperature is room temperature.