1. Look at the color of the packing tape: Generally, you should choose a transparent one. This quality is better than other colors.
2. Look at the gloss of the packing tape: Generally speaking, a good gloss is better than a non-glossy one. The so-called gloss is the color of the material itself, which is what customers should pay attention to.
3. Smell the smell of the packing tape: method, use a lighter, blow it out for 2, 3 seconds, smell the smell, distinguish the difference between it and the new material PP through the smell, and pay special attention to some color toners. The smell is bigger, which will cover part of the smell of PP.
4. Identification by wire drawing: After blowing out the fire, quickly touch it with an iron object, and then quickly pull it apart to see if the wire is formed uniformly. If it is uniform, it proves to be a good material. If the wire overlaps, pull it apart again to see if it is elastic, and see if it can be stretched again and continuously, unbroken or pulled apart for a period of time, indicating that it is good material, otherwise, it is of poor quality.
5. Look at the color of the fire: it is not good if it emits black smoke or melts quickly during the burning process.
6. Use the tooth bite to identify, first experience the strength of the new material or the recycled material. In comparison, the relatively soft material is not good.
7. Judging by the section of the incision: the section is rough and not shiny, indicating that the material is of poor quality.
