Forming single wall bells in double wall pipe

Details Forming single wall bells in double wall pipe Forming single wall bells in double wall pipe

1983-09-16

1985-02-19

Silbaugh, Jan

Plastic article or earthenware shaping or treating: apparatus

Preform assembly means and means for bonding of plural...

With treatment means other than assembling, bonding, shaping...

15624414, 15624418, 425504, 425505, 4251331, 425142, 425290, 4253261, 425336, 425503, B29C 506, B29C 1707, B29C 1714, B29D 2303

Patent

active

045002843

ABSTRACT:
A method and an apparatus for producing double walled thermoplastic pipe with integral bells are disclosed. The pipe has corrugated outer wall that has the bells molded into it, and a smooth inner wall. The inner wall is removed from the bell after the pipe is formed and set. During production, the inner wall is punctured along the bell section to admit air into the chamber between the two walls. This prevents collapse of the outer wall due to reduced air pressure as the air in the chamber cools.

REFERENCES:
patent: 3479422 (1969-11-01), Zavasnik
patent: 3538209 (1970-11-01), Hegler
patent: 4184831 (1980-01-01), Hegler et al.
patent: 4226580 (1980-10-01), Lupke et al.

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