Method of recycling polyester foam

Details Method of recycling polyester foam Method of recycling polyester foam

1997-05-20

2000-10-10

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

156 84, 156 99, 264 37, 264321, 264322, 264342R, 264DIG71, C08J 1104

Patent

active

061302619

ABSTRACT:
PET foam is processed into flakes. The flakes are densified in a pellet mill at between about 300.degree. F. and about 350.degree. F. to produce pellets. The pellets are then dried in a desiccant dryer at about 350.degree. F. for about 6 hours, so that the dew point of the pellets reaches about -40.degree. F. The dried pellets have an intrinsic viscosity about equal to virgin PET and a crystallinity greater than 20%. This material can be reused as if it were virgin PET.

REFERENCES:
patent: 3607999 (1971-09-01), Corbett et al.
patent: 3746610 (1973-07-01), Hoegger
patent: 4417932 (1983-11-01), Breitscheidel et al.
patent: 5258085 (1993-11-01), Breitscheidel et al.
patent: 5286321 (1994-02-01), Fuss
patent: 5695133 (1997-12-01), Morse, Jr. et al.
"The World's Largest designer and manufacturer of pellet mills and pelleting equipment," California Pellet Mill Co., Crawfordsville, IN (1993).

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