Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – Within pressurizing chamber
Patent
1986-09-16
1988-09-13
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
Within pressurizing chamber
2642098, 264540, 425376A, 425466, 425532, 4253824, B29C 4722
Patent
active
047706244
ABSTRACT:
A vertical plastic parison extruder with a relatively short vertical height and an adjustable choke between the extrusion screw and the extrusion die. The choke, in combination with a vertically moveable mandrel extending into the extrusion die, frictionally dissipates the rotational component of the moving viscous plastic between the extrusion screw and the exit of the extrusion die. The relatively short length and large diameter of the extrusion screw permits the moveable mandrel to extend through the extrusion screw and eliminates the need for lateral support of the extrusion screw and mandrel below the material feed entrance to the extrusion screw. The extrusion screw length to diameter ratio is adjusted to provide the same residence time for plasticizing the feed material as with the normally smaller diameter and longer extrusion screws.
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Chiesa Richard L.
Deimen James M.
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