Pharma-grade  PVC/PVDC/PE compound film is add high obstract material PVDC between PVC and PE. In practical application process, put liquid in PVC/PE compound film, if there is any liquid which has strong volatility, after a period of time stored, the liquid will volatilize, the quantity will reduce and the face of the product will inward
depression. It will reduce the effective protection capablity of the medicine. Seriously, it will cause the disput with consumers. Then the economy and the image of the company will be damaged. Due to the good obstruct ability of PVDC, it plays a good anti-infiltrate effect to the product in packing, it's the ideal packing material for easy humidity absorb medicine.
    PVDC material itself is the latex character, has quite big brittleness after the solidification. In the coating process and post-processing, the pivotal technical is to reduce its brittleness, make it normally used in the room temperature environment. Before, the technical ability is too poor to do so. That is one of the technical difficulties of PVDC compound material. However, the three compound processing technology is more difficult. At present, only few companies which has independent research and development ability can do it in China.