Expandable mandrel apparatus for manufacturing smooth-lined corr

Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means

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Details

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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patent: 3543349 (1970-12-01), Marocco
patent: 3923937 (1975-12-01), Piccioli et al.
patent: 4288653 (1981-09-01), Blom et al.

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