Apparatus for internally calibrating an extruded synthetic-resin

Details Apparatus for internally calibrating an extruded synthetic-resin Apparatus for internally calibrating an extruded synthetic-resin

1974-11-18

1976-11-09

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

425 72R, B29F 308

Patent

active

039908283

ABSTRACT:
A synthetic-resin tube as it emerges longitudinally from an extruder is passed over a two-part mandrel. A coolant such as water issuing from the upstream part of the mandrel passes axially downstream around the mandrel and is drawn into openings at the downstream part of the mandrel to draw the tube inwardly by suction toward the mandrel and impart to this tube the exact shape of the mandrel. Either or both of these parts may be formed as a longitudinal succession of transverse vanes having external peripheral shapes corresponding to the desired internal shape to be imparted to the tube. It is also possible to form either or both of the parts of the mandrel as a hollow cylindrical body formed with intake or output openings constituted as slits running either in the direction of travel or transverse thereto.

REFERENCES:
patent: 2987765 (1961-06-01), Cichelli
patent: 3212135 (1965-10-01), Branscum
patent: 3307219 (1967-03-01), Bigland
patent: 3329999 (1967-07-01), Cook
patent: 3445891 (1969-05-01), Thordarson
patent: 3762853 (1973-10-01), Upmeier
patent: 3898028 (1975-08-01), Upmeier

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