High strength fibre reinforced polymeric fasteners having threads, for example a nut and bolt

Abstract From the Canadian patent

In the production of a fastener, reinforcing fibres are wetted out in a bath of thermoset resin, drawn together into a wetted cable which is placed in a 'U'-shaped die recess of a first die part, having parallel inner side walls a second part of the, moulding die having side walls and a concave die surface then closes the recess by slidably engaging the parallel inner side walls, and pressure is applied to the wetted cable without expulsion of wetted fibres. Both die parts have die surfaces which include contours of fastener surfaces which may be, outstanding threads, or annular buttress type projections radiating from the shank.