مهندسی خوردگی

Pultrusion is a continuous process of manufacturing of composite materials with constant cross-section whereby reinforced fibers are pulled through a resin, possibly followed by a separate preforming system, and into a heated die, where the resin undergoes polymerization. Many resin types may be used in pultrusion including polyester, polyurethane, vinylester and epoxy.

But the technology isn't limited to duroplastic resins. More recently, Pultrusion has also been successfully used with thermoplastic matrices such as Polybutylene terephthalate (PBT) either by powder impregnation of the glass fiber or by surrounding it with sheet material of the thermoplastic matrix which is then molten up.

The design of pultrusion machines varies. Two often used types are reciprocating (hand-over-hand) and continuous (cat-track).

The term is a portmanteau word, combining "pull" and "extrusion".