Abstract
The extrusion molding process is less progressed in thermostting resins compared with that in thermoplastics, due to difficulties in analizing a complex change in flow of the compounds in a heating cylinder : on their melting, simultaneously takes place partial crosslinking which gives us technical tasks to be studied.
The extrusion molding has an advantage of higher efficiency in industrial production than the injection molding. The technical developement in the extrusion of thermosetting resins has been performed since the latter half of 1970's, from the viewpoints of both hardware (molding machines & equipment) and software (molding materials). This, as a result, led several companies in the world to a success in commercializing the technology.
This article describes the development in the extrusion technique of thermosetting resins, the difference in the extrusion technology between thermoplastics and thermosets, and a practice in the phenolic pipe extrusion.
