Apparatus for producing a helical tube

Details Apparatus for producing a helical tube Apparatus for producing a helical tube

1988-07-11

1990-05-29

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

72137, 198624, 2642094, 264281, 264295, 264DIG40, 425335, 425392, B29C 5308

Patent

active

049291670

ABSTRACT:
An apparatus for producing a curved tube, the apparatus comprising an extruder for extruding a tube having a wall including a first portion having a thickness, and a second portion diametrically opposite the first portion and having a thickness less than the thickness of the first portion, and rollers for forming the tube into a curve with the first portion being radially outward and with the second portion being radially inward so that the thickness of the first portion becomes substantially equal to the thickness of the second portion.

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