Plastic and nonmetallic article shaping or treating: processes – Recycling of reclaimed or purified process material – Of gaseous process material
Patent
1974-04-15
1976-08-24
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Recycling of reclaimed or purified process material
Of gaseous process material
264 401, 264140, 264176R, B29C 2900, B29D 300
Patent
active
039767302
ABSTRACT:
Method of employing a high percentage of reground polyethylene resin scrap in an extruder, wherein fluffy, low-density, polyethylene scrap resin is preferably admixed with a granular high-density polyethylene virgin resin, and the admixture fed by gravity into a first feed inlet in a screw-type conveyor, and granular polyethylene virgin resin fed by gravity into a second feed inlet generally adjacent to and downstream or the first feed inlet of the extruder. The admixture fed to the first feed inlet is insufficient to fill the volume of the extruder tube, while the virgin resin automatically fed by gravity fills up the total volume in the extruder tube, thereby preventing starvation of the resin to the extruder die in the event of blockage of the fluffy scrap resin, which technique permits high amounts of from 20 to 40% of scrap resin to be blended with virgin resin.
REFERENCES:
patent: 2540146 (1951-02-01), Stober
patent: 3342901 (1967-09-01), Kosinsky et al.
patent: 3344218 (1967-09-01), Chopra et al.
patent: 3418694 (1968-12-01), Strauss
patent: 3459840 (1969-08-01), Wood
patent: 3535408 (1970-10-01), Ronden
patent: 3672803 (1972-06-01), Rees
Crowley Richard P.
Deerfield Plastics Co., Inc.
Hoag Willard E.
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