Solid material comminution or disintegration – Processes – With heating or cooling of material
Patent
1991-02-19
1992-05-26
Hajec, Donald T.
Solid material comminution or disintegration
Processes
With heating or cooling of material
241 99, 209 2, 209 11, 209 12, 209 17, 209173, 209539, 209930, B02C 1108
Patent
active
051159872
ABSTRACT:
A method for separation of beverage bottle components including high density polyethylene (HDPE) basecup; poly ethylene terephthalate (PET) bottle body; aluminum cap; paper/plastic labels and adhesives, including disjoining, isolating and separating the various bottle components. The method essentially involves steps of: bisecting the bottles into two halves to disengage the cap from the bottle body; heating the bisected bottle halves so as to cause thermal softening of the adhesives; mechanically isolating the thermally loosened assemblage; subjecting the isolated components to a flotation tank; collecting the light (floating fraction) and heavy (sunk fraction) fractions separately; air classifying the light HDPE fraction to remove labels; separating the components of the heavy fraction (aluminum and PET) due to their size differential.
REFERENCES:
patent: 3814240 (1974-06-01), Laundrie
patent: 4160398 (1979-07-01), Bichot et al.
patent: 4199109 (1980-04-01), Watanabe
patent: 4331227 (1982-05-01), Risley
patent: 4693379 (1987-09-01), Stehle
patent: 4832205 (1989-05-01), Bacus
Hajec Donald T.
Kaufman Joseph A.
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