Improvements in suction applying mold blocks in pipe forming app

Details Improvements in suction applying mold blocks in pipe forming app Improvements in suction applying mold blocks in pipe forming app

1989-09-11

1991-03-26

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

4253261, 425336, 425396, B29C 5330

Patent

active

050024787

ABSTRACT:
The invention concerns apparatus for making corrugated tubing. Mold blocks for formation of a travelling mold tunnel are provided with suction to the mold face by means of communication between suction passages in the mold block and a suction chamber. Each mold block has a channel which slidingly engages a track of the suction chamber to receive suction as the mold blocks travel over the track. Tongue and groove connectors are provided between the channel of each block and the track of the suction chamber and communication surfaces of the tongue and groove connectors to provide suction from the suction chamber to the mold face.

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