Control apparatus for producing uniform thickness corrugated tub

Details Control apparatus for producing uniform thickness corrugated tub Control apparatus for producing uniform thickness corrugated tub

1978-05-26

1981-03-10

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

With electrical control system

Of diverse shaping means or sequential contact of work with...

264508, 425155, 425168, 4253261, B29C 1707, B29D 2318

Patent

active

042551072

ABSTRACT:
Apparatus and method for producing thermoplastic corrugated tubing having substantially uniform thickness throughout comprises extruder and step of forming hollow smooth-walled extrudate. Corrugating structure immediately adjacent extruder is arranged to receive extrudate and to form corrugations therein. Such structure includes continuously moving cooperating mold blocks configured to form alternating annular peak portions, valley portions and interconnecting side wall portions in extrudate when it is blown into intimate engagement with configured mold blocks. Thickness of extrudate being corrugated is controlled to provide relatively thin extrudate portions during formation of annular valley portions and relatively thick extrudate portions during formation of annular peak and interconnecting side wall portions.

REFERENCES:
patent: 2940126 (1960-06-01), Sheridan
patent: 3019481 (1962-02-01), Negoro
patent: 3349156 (1967-10-01), Zieg
patent: 3674404 (1972-07-01), Burlis et al.
patent: 4136143 (1979-01-01), Lupke et al.

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