Apparatus for producing multi-walled thermoplastic tubing

Details Apparatus for producing multi-walled thermoplastic tubing Apparatus for producing multi-walled thermoplastic tubing

1982-09-29

1985-04-09

Kimlin, Edward

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With work cooling means

156501, 15624415, 15624426, 156205, 425378R, 425393, 425396, 264515, B32B 3100, B29B 714, A01J 2102, A23G 102

Patent

active

045100136

ABSTRACT:
In an apparatus for producing multi-walled thermoplastic tubing in which the inner and outer tubing walls are continuously formed by extrusion one within the other, the inner tube being urged outwardly into pressing engagement with the outer tube, the mechanism for urging the inner tube outwardly into securement with the outer tube comprises a mandrel mounted coaxially with the die for extruding the inner tube and on the downstream side of it. The mandrel has an outer surface providing a tapered end portion positioned to receive the inner tube as it is extruded, and a generally cylindrical portion positioned to urge the inner tube into securement with the outer tube. To prevent sticking of the thermoplastic material to the mandrel, the outer surface of the mandrel is maintained at a temperature lower than the molding temperature and is transversely ribbed.

REFERENCES:
patent: 3538209 (1970-11-01), Hegler
patent: 3976414 (1972-07-01), Hegler
patent: 4136143 (1979-01-01), Lupke et al.
patent: 4165214 (1976-08-01), Lupke et al.
patent: 4226580 (1980-10-01), Lupke et al.
patent: 4305703 (1981-12-01), Lupke et al.
patent: 4365948 (1982-12-01), Chaplain
patent: 4370187 (1983-01-01), Katagiri et al.

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