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 What to do with coextruded PET/PETG
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| Author | Topic: What to do with coextruded PET/PETG |
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vmping Member Posts: 4 |
posted May 05, 2010 08:42 AM
  
How can we convert coextruded 20%PETG/80%PET back to a useable material? Crystallizing & drying at PET temperatures cannot be done do to PETG. Is pelletizing a possibility? We do pelletize some of our HIPS & PP regrind but have never tried PET; I assume we would need some different equipment to do this, any suggestions. IP: Logged |
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Tom C Moderator Posts: 984 |
posted May 05, 2010 09:50 AM
This is just thinking out loud; You can possibly turn the regrind into pellets without drying, or limited drying, the regrind by selecting the right extrusion process. The PET and PETG are likely to be compatible and the refractive index is close so some amount of PETG may be able to be buried in a PET maxtrix. Drying and crystallization of the pelletized mixture can be tested to see what it can take and those pellets fed back into the PET stream, or used as a seperate layer in the coextrusion. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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vmping Member Posts: 4 |
posted May 05, 2010 02:06 PM
I have to agree pelletizing seems to be our best bet. I don’t believe the pelletizing equipment we have at this time would work for PET. Would you be able to send me in a direction to learn more about this process? IP: Logged |
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Tom C Moderator Posts: 984 |
posted May 05, 2010 02:21 PM
Many companies opt to have an outside toller convert the material to pellets. If I knew your location I might be able to make a recommendation. Pelletizers are supplied by Gala, Crown, Bay, Reduction Engineering, Cumberland, Reiter. Some of these companies may have changed names and ownership recently. An extruder with a vent is required. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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