Process for making a corrugated tube

Details Process for making a corrugated tube Process for making a corrugated tube

1990-12-20

1992-07-21

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

264322, 264DIG42, 4253871, 425393, 425403, B29C 3504, B29C 2318

Patent

active

051320738

ABSTRACT:
A corrugated elastomeric tube having a smooth interior surface (28) generally free from nipples is produced. A first step in the process is carried out by positioning an unvulcanized elastomeric tubing (14) over a mandrel (12) having a corrugated outer surface (13). The mandrel (12) has an exterior surface (30) which is free from holes. Next, each end of the tubing (14) is clamped to the mandrel (12). The tubing (14) and the mandrel (12) are heated to soften and vulcanizing the tubing (14). Also, pressure is provided to cause the tubing (14) to conform with the corrugated outer surface (13) of the mandrel (12). The vulcanized corrugated tube is then removed from the mandrel (12).

REFERENCES:
patent: 1665309 (1928-04-01), Laursen
patent: 2699575 (1955-01-01), Haury
patent: 2903744 (1959-09-01), Harrison

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