Fibre-reinforced plastics pipe with threaded end joint section.

摘要

A fiber-reinforced plastic pipe with a male-threaded and/or female-threaded end joint section having improved axial strength sand thread contour, exhibiting a high degree of seal tightness, and withstanding a high internal pressure. The female threads comprise a first resin layer, a second fiber-reinforced resin layer having continuous filaments extending at an angle of 0 +/- 15 DEG to the longitudinal axis of the pipe, and a third fiber-reinforced resin layer having continuous filaments extending at an angle of +/- 85 DEG to 90 DEG to the longitudinal axis. The male threads comprise short fibers flocked in the radial direction on a fiber-reinforced plastic substrate layer and impregnated with a resin.