Ningbo XISXI E-commerce Co., Ltd , https://www.xisxipet.com This type of packaging paper, called PS, uses a semi-permeable membrane that can only pass through water as the surface material, and a high-permeable pressure material and a polymer water-absorbing agent on the inside. The wrapper does not damage the cells of the food tissue, but also inhibits the activity of the enzyme, prevents the decomposition of the protein, reduces the proliferation of microorganisms, and achieves the effect of maintaining the freshness of the food, concentrating the umami component, and improving the toughness.