Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means
Patent
1981-05-18
1982-12-07
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Female mold type means
425129R, 425435, 249 65, 264 466, B29C 600
Patent
active
043624898
ABSTRACT:
A smooth, plastic-lined corrugated pipe having an intermediate layer of plastic foam. The pipe is made by internally coating a corrugated pipe with a foaming mixture and pressing an expandable cylinder of plastic sheet liner against the foaming mixture until the foam solidifies. An expandable mandrel apparatus presses the plastic sheet liner into position. The apparatus comprises a hollow cylinder, an elastomeric cylinder fitted on the outside of the hollow cylinder defining an annular space therebetween and a fluid conducting means communicating with the annular space.
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Bethlehem Steel Corporation
Biggs Anson W.
Delaney Michael J.
Flint, Jr. J. Howard
O'Keefe Joseph J.
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