Apparatus for forming unevenness on an outer surface of a synthe

Details Apparatus for forming unevenness on an outer surface of a synthe Apparatus for forming unevenness on an outer surface of a synthe

1986-05-09

1987-09-29

Lowe, James

Plastic article or earthenware shaping or treating: apparatus

Three or more platens movable on intersecting paths to...

264293, 264320, 425385, 425392, 425397, 425DIG218, B29C 5902

Patent

active

046966358

ABSTRACT:
In order to improve the bonding strength between a synthetic resin-coated steel pipe and concrete applied around the synthetic resin-coated steel pipe for weight coating or protection, unevenness formed of groove portions and ridge portions arranged alternately is formed on the outer surface of the synthetic resin-coated steel pipe by pressing the synthetic resin coating layer with a working tool having an uneven inner surface under a condition where at least one member of the working tool and the synthetic resin coating layer is kept at a temperature at which the synthetic resin is melted.

REFERENCES:
patent: 452204 (1891-05-01), Weiet
patent: 2175099 (1939-10-01), Abbott
patent: 2867001 (1959-01-01), Lewis et al.
patent: 3387330 (1968-06-01), Lemelson
patent: 3470286 (1969-09-01), Weber

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