FLEXIBLE CORRUGATED RUBBER TUBING WITH INTERNAL REINFORCEMENT

摘要

FLEXIBLE CORRUGATED RUBBER TUBING WITH INTERNAL REINFORCEMENT A method for making flexible, corrugated rubber tubing with internal reinforcement. An extruded sleeve of uncured rubber is slid axially onto an elongated internal forming member, after which an external forming means is placed around the assembled sleeve and used to form corrugations. The resulting product is heat-treated to set the corrugations and thus to form a flexible corrugated tube length. A helix formed of flexible, resilient wire rod is pulled through the corrugated tubing in an axial direction and simultaneously rotated in a direction to thread the helical rod into the internal hellcal groove in the sorrugated product. At the same time, the helix is axially extended to reduce its helix diameter. When the helix has been completely extended through the corrugated tubing, it is released so that it expands radially into tight conformance with the internal helical groove.