Apparatus for making tubing from thermoplastic synthetic material

摘要

A tubular parison of synthetic plastic material in thermoplastic condition is extruded into a travelling mold wherein it is formed into a corrugated tube. The travelling mold is formed when cooperating mold sections of two endless strings of such mold sections move together and travel for some distance in a straight path before moving apart again. Each mold section has front and rear guide rollers which travel in guide channels that are so configurated as to impart to the mold sections the aforementioned movements toward and away from each other.