Method for the formation of a hole in a plastic pipe

Details Method for the formation of a hole in a plastic pipe Method for the formation of a hole in a plastic pipe

1988-07-07

1989-10-10

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Perforation by differential fluid pressure; or smoothing,...

264508, 264521, 264526, 264571, 425290, 425303, 4253261, 425336, 4253421, 4253871, 425388, 425396, 425DIG119, B29C 4904, B29C 4938

Patent

active

048730483

ABSTRACT:
A method of forming a hole in a plastic pipe feeds a plastic layer for the plastic pipe from a nozzle about a mandrel into chill moulds being displaced along an elongated mould cavity about the mandrel formed by the chill moulds. All of the plastic layer is pressed into the chill moulds with a pressure medium between the mandrel and all of an inner surface of the plastic layer for forming the plastic pipe therefrom. Only portions of the plastic layer of the plastic pipe are then subjected to a local pressure difference exceeding the breaking limit of the plastic layer between the inner surface and an opposite, outer surface of the plastic layer at least in part from a flowing medium for forming a hole in the plastic layer of the plastic pipe, the flowing medium being one of a gas and a liquid and flowing from the mandrel at a pressure higher than that of the pressure medium pressing the plastic layer of the plastic pipe.

REFERENCES:
patent: 3349156 (1967-10-01), Zieg
patent: 3708253 (1974-04-01), Lemelson
patent: 3947174 (1976-03-01), Hureau et al.
patent: 4303609 (1981-12-01), Hureau et al.
patent: 4541794 (1985-09-01), Raley et al.
patent: 4655986 (1987-04-01), Cothran et al.

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