Resin moulding screws

Details Resin moulding screws Resin moulding screws

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

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