Method and apparatus for making flexible corrugated rubber...

Details Method and apparatus for making flexible corrugated rubber... Method and apparatus for making flexible corrugated rubber...

B - Operations, Transporting

29

D

18/941

B29D 23/18 (2006.01) B29C 53/30 (2006.01)

Patent

CA 1090080

ABSTRACT OF THE DISCLOSURE A method and apparatus for making flexible rubber tub- ing with axially spaced annular or helical corrugations. A sleeve of uncured vulcanizable rubber is slipped over a forming mandrel and an external form comprising a length of flexible, corrugated, axially compressible rubber tubing is positioned over the sleeve, The interior wall of the external form defines a shaping surface for use in forming embryonic corrugations in the sleeve. The sleeve is radially expanded into the shaping surface and the form and sleeve are axially compressed concer- tina-fashion to increase the radial dimensions of bulged por- tions of the sleeve between the corrugations of the external form to make embryonic corrugations in the sleeve. The sleeve and external form are then removed from the forming mandrel and the sleeve is placed on a curing mandrel with the corrugations at desired spacings, after which the sleeve is cured.

270330

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