Method for forming tubing utilizing suction and pneumatic...

Details Method for forming tubing utilizing suction and pneumatic... Method for forming tubing utilizing suction and pneumatic...

B - Operations, Transporting

29

C

18/787

B29C 49/00 (2006.01) B29C 47/00 (2006.01) B29C 47/12 (2006.01) B29C 47/90 (2006.01) B29C 49/22 (2006.01)

Patent

CA 1329871

ABSTRACT The invention concerns a cooling plug for sizing the interior surface of thermoplastic extruded pipe. Vacuum and/or pneumatic pressure is applied at the surface of the plug. The pneumatic pressure may cause the inner wall to balloon outwardly to form bells within a mold or within an outer wall, to fit into corrugations of an outer corrugated tube, etc. The vacuum may be used to pull the inner wall back to the surface of the plug after application of pneumatic pressure.

599965

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