Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1978-12-05
1980-07-08
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
264566, 264568, 264167, 425376A, 425376B, 425465, B29C 1707, B29D 2303, B29F 3012
Patent
active
042115256
ABSTRACT:
What is disclosed is a method and apparatus for forming a radially expanded and stretched tube of synthetic resin having a plurality of longitudinal-support members, corrugated in the longitudinal tube direction, joined to and extending between two opposing tube walls, by extruding the tube such that that areas of the opposing walls extending between two adjacent support members comprise alternating thick and thin wall portions in the longitudinal direction and every thin portion has a laterally-adjacent thick wall portion, whereby on subsequent stretching and expansion, the thick and thin wall portions stretch disproportionately and deform the support members attached thereto unequally to effect their corrugation in the longitudinal direction.
REFERENCES:
patent: 3929951 (1975-12-01), Shibata et al.
Rohm GmbH
Silbaugh Jan H.
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