PVC plastic box plastic packaging box printing, processing technology introduction
2023-07-27
China's PVC film box industry is mainly concentrated in the southeast coast and the Pearl River Delta area, Foshan is China's largest PVC film production base. From the late 1950s to form an independent industrial sector, China's PVC film industry has gone through half a century, PVC film manufacturing enterprises above the scale of nearly 400, large and medium-sized enterprises about 200. Meanwhile, China's PET film manufacturing capacity has reached the world's leading level. At present, PVC film manufacturers use sieve purpose is to make the particle size of PVC resin powder uniform and consistent, easy to operate: large particles, then the plasticizing temperature is high, the time to be long, the time required to absorb plasticizer more; particles are small, then the time required to absorb the plasticizer is short, the temperature required for PVC film plasticization is low, the plasticizing time is short; particles of the particle size distribution is too wide, then the temperature and time of PET film plasticization is not easy to control. Therefore, PVC resin powder should be sieved before PVC granulation to remove the oversized PVC particles.
