EP 1244540 A4 20021106 - PROCESS FOR PREPARING FOOD CONTACT GRADE POLYETHYLENE TEREPHTHALATE RESIN FROM WASTE PET CONTAINERS
Title (en)
PROCESS FOR PREPARING FOOD CONTACT GRADE POLYETHYLENE TEREPHTHALATE RESIN FROM WASTE PET CONTAINERS
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ZUM KONTAKT MIT LEBENSMITTELN GEEIGNETEM POLYETHYLENTEREPHTHALAT AUS PET-BEHÄLTER-ABFALL
Title (fr)
PROCEDE DE PREPARATION DE RESINE POLYETHYLENE TEREPHTHALATE APTE AU CONTACT ALIMENTAIRE A PARTIR DE RECIPIENTS PET JETABLES
Publication
Application
Priority
- AU 0001131 W 20000918
- AU PQ294699 A 19990917
Abstract (en)
[origin: WO0121373A1] A process for preparing food contact grade PET from a waste stream containing PET and non PET materials is disclosed. The process involves the steps of sorting at least some of the non PET materials from the waste stream, followed by dividing the PET containers into flakes of preferable maximum size approximately 10mm, followed by washing the flakes in a hot aqueous medium containing alkaline materials and surfactants, preferably non-ionic, to remove particulate and absorbed contaminants from the surfaces of the flakes. This step is followed by de-watering and then drying the flakes to a moisture content of 0.1 % w/w maximum, and more preferably 0.01 % w/w maximum. The next step involves removing absorbed contaminants and moisture by heating and vigorously mixing the flakes under vacuum, preferably 1-10 millibar, more preferably 2-7 millibar and at a temperature less than the melting point of PET, preferably in the range 170-220 DEG C for at least 30 minutes, preferably at least 60 minutes. The final step involves melting the flakes in a screw extruder equipped for vacuum processing and extruding the molten material to form strands that are pelletised.
IPC 1-7
IPC 8 full level
C08J 3/12 (2006.01); B29B 9/06 (2006.01); B29B 13/00 (2006.01); B29B 17/00 (2006.01); B29B 17/02 (2006.01); B29B 17/04 (2006.01); B29K 67/00 (2006.01); B29K 105/26 (2006.01)
CPC (source: EP)
B29B 17/02 (2013.01); C08J 11/04 (2013.01); B29B 17/0412 (2013.01); B29B 2013/002 (2013.01); B29B 2013/005 (2013.01); B29B 2017/0203 (2013.01); B29B 2017/0289 (2013.01); B29B 2017/0293 (2013.01); B29C 48/022 (2019.02); B29C 48/04 (2019.02); B29K 2067/00 (2013.01); B29K 2067/003 (2013.01); B29K 2105/065 (2013.01); B29K 2105/26 (2013.01); B29L 2031/712 (2013.01); B29L 2031/7158 (2013.01); C08J 2367/02 (2013.01); Y02P 20/143 (2015.11); Y02W 30/62 (2015.05)
Citation (search report)
- [X] US 5358119 A 19941025 - STAHL INGO [DE], et al
- [X] US 4830188 A 19890516 - HANNIGAN BENJAMIN R [US], et al
- [A] EP 0856537 A2 19980805 - ILLINOIS TOOL WORKS [US]
- See also references of WO 0121373A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0121373 A1 20010329; AU 7631000 A 20010424; AU 777435 B2 20041014; AU 777435 C 20060223; AU PQ294699 A0 19991014; BR 0014094 A 20020521; CA 2384878 A1 20010329; EP 1244540 A1 20021002; EP 1244540 A4 20021106; JP 2003509249 A 20030311; KR 20020055580 A 20020709; NZ 517832 A 20020628
DOCDB simple family (application)
AU 0001131 W 20000918; AU 7631000 A 20000918; AU PQ294699 A 19990917; BR 0014094 A 20000918; CA 2384878 A 20000918; EP 00965627 A 20000918; JP 2001524779 A 20000918; KR 20027003540 A 20020316; NZ 51783200 A 20000918