Method of forming a pipe of oriented thermoplastics polymeric ma

Details Method of forming a pipe of oriented thermoplastics polymeric ma Method of forming a pipe of oriented thermoplastics polymeric ma

1981-06-01

1984-01-31

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264528, 264535, 264541, 264570, 264573, 264296, B29C 1707

Patent

active

044289006

ABSTRACT:
A pipe of oriented thermoplastic polymeric material having an integral socket is manufactured by expanding a tubular blank having a portion of greater wall thickness which is positioned in a portion of a female mould defining the socket. The tubular blank is heated by circulation of hot water to a temperature at which deformation will induce oriention of the polymer molecules, and is then expanded radially outwards against the mould by application of internal pressure. In this manner the wall thickness and rigidity of the socket are increased.

REFERENCES:
patent: 3873660 (1975-03-01), Reilly et al.
patent: 3899565 (1975-08-01), de Putter et al.
patent: 3949038 (1976-04-01), McChesney et al.
patent: 4107249 (1978-08-01), Murai et al.
P. S. Reid and J. D. Cochrane, "Big Blow Moulding," British Plastics, 5-1962, pp. 220-226.

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