Method for the continuous production of fiber reinforced plastic pipes of variable wall thickness

Abstract

Abstract Method for producing a shell of nonuniform thickness wherein hardenable shell forming materials are fed onto an envelope which is both rotated about a longitudinal axis and simultaneously advanced along the axis at a generally constant rate. The materials are fed onto the envelope from applicator means at a generally uniform and preferably uninterrupted rate. Nonuniform shell thickness is obtained, however, by moving the applicator means in one of the directions of envelope movement for a portion of a programmed cycle to give a thick shell section and returning the applicator means in the opposite direction of envelope movement to the starting point of the applicator means during another portion of the cycle to give thinner shell section. The movement of the applicator means may be longitudinally of the envelope, or may be circumfrentially of the envelope.

Inventors

• 👤 P Poulsen

Bibliographic Details