Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1987-03-09
1988-10-04
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
521 40, 521 455, 528502, B07B 700, B29B 1700, C08J 1106
Patent
active
047756977
ABSTRACT:
Pure polymer, such as polyester used in photographic film and in plastic walls of drink bottles or polycarbonate used in high-quality plastic beverage bottles, is separated from thin saran and like coating layers of a multi-layer film or sheet in a dry process. The coating layer is typically 1/2% or less of the total sheet or film thickness. The dry abrasion process in one form comprises rotating and mixing a volume of dry plastic chips of said film or sheet with about two volumes of small, hard abrasive particles such as quartzite aggregate, glass cullet, or the like, for a time just sufficient to abrade the thin coating layer from the film or sheet. The abrasive particles and the coating dust are separated from the pure polymer by air classifiers. The resulting polymer chips are clean and dry and are immediately available for pelletizing and reuse. Polymer may also be recovered from the dust, as by electrostatic separation.
REFERENCES:
patent: 3335966 (1967-08-01), Haveman
patent: 3928253 (1975-02-01), Thornton et al.
patent: 3969601 (1973-10-01), Knox
patent: 4020020 (1977-04-01), Appleyard et al.
patent: 4602046 (1986-07-01), Buser et al.
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