Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1984-11-30
1990-11-13
Fertig, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
26421121, 26421123, 425202, 425311, B29B 906, B29C 4766
Patent
active
049700405
ABSTRACT:
In a case of a process for producing pourable spherical-segment-shaped packing material particles made of a plastic material which have an external convex and an internal concave surface, the plastic material is fed in by means of a feeding funnel through an opening in a bush surrounding the extrusion screw. The plastic material is plasticized and, because of the difference in speed existing over the cross section of the mass, comes out of an opening in the die with a bent surface. The extruded plastic material is cut off directly at the opening of the die and before any considerable expansion has taken place. In this case, the plastic material is pulled into a space between the extrusion screw and a bush (28) provided with longitudinal grooves (35) in the material pull-in zone (13). The result is a possibility for some of the plastic granules to escape into the longitudinal grooves (35) and an increased and steadier transport of material through the extruder (FIG. 1).
REFERENCES:
patent: 2915957 (1959-12-01), Bowman
patent: 3259944 (1966-07-01), McIlvin
patent: 3703347 (1972-11-01), Hester et al.
patent: 3745200 (1973-07-01), Geyer
patent: 3954366 (1976-05-01), Fields
patent: 3961000 (1976-06-01), Ropiequet
Fertig Mary Lynn
Storopack Hans Reichenecker GmbH & Co.
Witherspoon John F.
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