How to identify the melting point of plastic PET

How to distinguish between high-temperature PET and low-temperature PET? I believe this is a problem that we all very much want to understand. Today, the experts of China Bottle Bottle Network have specially arranged for everyone in the form of a question and answer, hoping to help everyone A : For the recycled material, can it be separated with the naked eye or some simple method?
B: If you have a melting point tester, I believe you will do it very easily. By the way, telling you that a melting point tester costs about 20,000 yuan, it can be taken away like a briefcase. Do PET bottles without this stuff you can be left behind.
When the ignition is burning, the wire is pulled and stretched, and then the wire is broken. If the broken wire can be rolled into several rolls, the melting point is normal, and the more instructions are higher. In this respect, I am not qualified because of my lack of experience. I cannot do this with a few volumes. You can experiment more with yourself.
In addition, in the ignition, if the melting is rapid, it means that the melting point is low, and that the burned bottle pieces become particularly black, indicating that the melting point is low, and the other is that if the taste smells sweet, it may also be a low melting point. . This is what the older generation said.
1, smell the smell first, the taste of PET is different from normal plastic. Burn it with a lighter, then it will smell very aromatic and comfortable (by burning a bottle to smell), if PET contains other ingredients, the taste is very pungent One type of bottle containing SEBS cannot be used.
2, to see the burned part, if the distribution of black or oil drops quickly, most of the melting point is not normal, which is often found in PET film.
3, drawing, when burning in the lighter to pull the wire, see the silk does not grow long, and then pulled out of the silk pull off to see the middle of the breakpoint, the wire is not rolled into a small circle, the more volume More to explain the high melting point. But generally if it is a bottle, there shouldn't be any big problems. The key point is to tell whether it contains PVC, which is a fatal injury to PET.
Miscellaneous: When the ignition is burning, the wire is pulled and stretched, and then the wire is broken. If the broken wire can be rolled into several rolls, it means that the melting point is normal, and the more the instructions are higher. In this respect, because of my lack of experience, I can't specify several volumes to be qualified. In addition, when I ignite, if I melt quickly, it means that the melting point is low, and that the burned bottle pieces become particularly black, indicating that the melting point is low. If the taste is particularly sweet, it may also be low melting point.