Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1978-07-14
1980-08-05
Michl, Paul R.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
198661, 425208, 366 79, 366 89, B29F 302
Patent
active
042159784
ABSTRACT:
In a resin moulding screw provided with helical flight and valley, the bottom surface of valley is divided into a plurality of portions along a dividing line, and the divided portions are alternately displaced in the radial direction to form wavy contours. Barriers are provided to cross the dividing line to form dams which prevent intercommunication of the valleys at the bottom of the screw groove to prevent decrease of the thrust pressure along the flight for efficiently blending and melting solid and molten resins.
REFERENCES:
patent: 3698541 (1972-10-01), Barr
patent: 3701512 (1972-10-01), Schippers et al.
patent: 4128341 (1978-12-01), Hsu
Hashimoto Kiyoshi
Takayama Seizo
Hamrick Claude A. S.
Michl Paul R.
Ube Industries Ltd.
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