Method of producing an internally smooth, externally ribbed tube

Details Method of producing an internally smooth, externally ribbed tube Method of producing an internally smooth, externally ribbed tube

1990-01-04

1991-01-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

2642094, 2642098, 4253261, 425393, 425396, 425812, B29C 4776, B29C 4788

Patent

active

049833472

ABSTRACT:
In the production of plastic tubes or pipes which are internally smooth-walled but have peripheral ribs externally, in particular from extrudable, more especially thermoplastic plastic such as PVC, a good filling of the cavities in the moving mold which are provided to form the ribs, is achieved in that said cavities are filled with the molten plastic first at a distance from the separating plane of the moving mold and last in the region of said separating plane.

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patent: 4402898 (1983-09-01), Rosenbaum
patent: 4710337 (1987-12-01), Nordstrom
patent: 4721594 (1988-01-01), Jarvenkyla

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