PURPOSE: To obtain a pipe whose mechanical strength at any part of the pipe is uniform, by a method wherein fiber-reinforced plastic rings, to the circumferential surface of which pins are set up, are fitted over both the ends of a mandrel and resin-impregnated fiber is wound round the mandrel while it is being folded back by the pins of the ring.
CONSTITUTION: An iron plate, for example, on which a plurality of holes corresponding to pins 3 is provided is arranged on the surface of a prepreg sheet in a state of a flat bar 4 to be obtained by impregnating glass cloth with liquid resin, the hole is filled with glass fiber impregnated with the liquid resin of the same quality with the prepreg sheet, which is made to cure and a ring 2 is formed by removing the iron plate. Then the ring 2 is fitted over the surface of the mandrel 1 through an adhesive layer 6 having compatibility with the innermost layer 5 of the prepreg sheet which is of the same quality with the ring 2 laminated beforehand on the surface of the mandrel 1. Then pipe having no slip of the glass roving is obtained by pulling off resin impregnated fiber which is of the same quality with the ring 2 from the mandrel 1 after it has been cured by winding round the mandrel 1 while the resin impregnated fiber is being folded back by the pin 3.
MIYAMAE HIDEAKI
HIRAYAMA YOSHIAKI
| JPS4918749A | 1974-02-19 |