In one of your recent videos "step by step: how to recycle PET bottles from A-Z" I can see, that your Airid uses a different user Interface. When I try to set the temperature at your recommended 140°C for PET drying, it only lets me set it to a maximum of 110°C. An Update for the Airid is not available on your homepage. I want to recycle PET bottels too, so I would like to be able to use the same settings as a benchmark for my kind of PET.
Hello @hsu_hh ,
Thank you for being interesting in our PET videos 😉
I am sorry, for it took me a bit of time to investigate the situation. You are totally right : PET should be dried at 140°C. Our Airid Dryers are capable of reaching 160°C.
Your Airid currently runs an older firmware version. I will send you a private email with more detail in just a moment.
I am very sorry about the inconvenience.
Hello and thank you for the very instructive forum.
To build on this topic, I have dried my PET for 4hours at 160 C qui I see no change in weight.
As far as I know, by releasing its moister the pet should lose weight right?
From videos seen here and there is should be about 5%.
Am I right?
ok I found my answer - it seems the weight moisture weight is only about o.o5%.
So quite difficult to measure.
Hello @valentin ,
Thank you very much for asking, and also for replying 😉
You are right : the target moisture content is typically 0.05%wt. Some manufacturers even recommend 0.025%wt.
In order to measure this, you would need to use a special moisture analyzer device. (this would pretty much be a very accurate weighing scale combined with a heated chamber).
If you do not have access to such a device, you can try extruding your PET. If the extrusion test is succesful without any bubbles, then it means the drying step was good enough.
Do you have any further questions ? I would be curious to hear about your results.
This video might help https://youtu.be/HBCOyyY73e0