Process for the removal of foreign materials from a post-consume

Details Process for the removal of foreign materials from a post-consume Process for the removal of foreign materials from a post-consume

1992-03-31

1993-06-29

Michl, Paul R.

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

Synthetic resins

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

521 41, 521 485, C08J 1106

Patent

active

052235440

ABSTRACT:
In today's environment, it is becoming increasingly more important to recycle plastics including polyethylene terephthalate. Technology available today allows for polyethylene terephthalate to be recycled into a wide variety of useful products. For instance, carbonated beverage bottles which are comprised of polyethylene terephthalate can be recycled into new polyethylene terephthalate beverage bottles. However, a relatively pure polyethylene terephthalate post consumer feed stream is required in many such recycling programs. Unfortunately, such feed streams are often contaminated with foreign material. This invention relates to a process for removing foreign materials from a post-consumer polyethylene terephthalate feed stream which comprises: (1) depolymerizing the polyethylene terephthalate feed stream into a melt having a melt viscosity which is within the range of 0.001 poise to 1000 poise, (2) feeding the melt into a separation device, (3) allowing low density foreign materials to float to the surface of the melt, (4) allowing high density foreign materials to sink to the bottom of the melt, and (5) removing molten polyethylene terephthalate oligomer from an area which is located intermediately between the surface of the melt and the bottom of the melt.

REFERENCES:
patent: 3108082 (1963-10-01), Riehe et al.
patent: 3652466 (1972-03-01), Hittel et al.
patent: 3884850 (1975-05-01), Ostrowski
patent: 4143001 (1979-03-01), Raab et al.
patent: 4439550 (1989-03-01), Brennan
patent: 4542239 (1985-09-01), Lamparter et al.
patent: 4605762 (1986-08-01), Mandori
patent: 4609680 (1986-09-01), Fujita et al.
patent: 5045145 (1992-03-01), Rosen
patent: 5120768 (1992-06-01), Sisson

Affiliated with

Also associated with

Rating

Process for the removal of foreign materials from a post-consume does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the removal of foreign materials from a post-consume, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the removal of foreign materials from a post-consume will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1755886