Extruder and calibrating apparatus for making ribbed or grooved pipe
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United States of America Patent
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May 27, 1986
Grant Date -
N/A
app pub date -
May 8, 1985
filing date -
Sep 23, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An extruder assembly (1) for extruding round, cylindrical plastic pipe having a smooth inner pipe wall and a ribbed or ridged outer pipe wall, comprising a feed screw (2) for transporting and softening the plastic material (4), and an annular nozzle having a central mandrel (6). The mandrel constitutes a cylindrical, coaxial extension of the feed screw. The mold part (8) of the nozzle is provided with one or more parallel, helical grooves (14) with the spiral extending in the direction of rotation of the screw and mandrel, and the mold part (8) is provided with a lubricating device (17) for lubricating the molding surface of the mold part. A calibrating device (27) with helical grooves (28) is provided downstream of the annular nozzle.
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