Corrugated mold block

Details Corrugated mold block Corrugated mold block

B - Operations, Transporting

29

C

18/1204

B29C 33/42 (2006.01) B29C 33/10 (2006.01) B29C 49/00 (2006.01)

Patent

CA 2011057

A corrugated mold block for a vacuum machine for molding corrugated tubes is formed of a plurality of sub- blocks rigidly secured end to end. Each sub-block has an arcuate face which is corrugated with not more than one com- plete wavelength of circumferential grooves and lands, and two longitudinally spaced end surfaces. A vacuum channel is provided about one of the end surfaces of each sub-block, and openings in each sub-block connect the channel and the face. When the sub-blocks are secured together into a mold block (and when mold blocks abut during molding), the vacuum channels and openings together define vacuum passages for each of the corrugation grooves, which passages are all con- nected to a vacuum source for drawing a vacuum during mold- ing.

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