What are the advantages of PVC bags
According to the different thickness of PVC film and different uses, PVC bags, cosmetic packaging bags, stationery packaging bags, craft jewelry packaging bags, gift bags and other products are packaged. Many high-end product manufacturers generally choose PVC bags for packaging, beauty products, and upgrade product quality, but their prices are more expensive than OPP bags / PE bags.
1. The PVC bag has good light transmittance, and the new film has a total light transmittance of more than 85%; the outer light transmittance of the crop is small, and the 0.3μm wavelength only transmits 20%, so it is often used as the material of the PVC bag. Ethylene (PE) shed film penetrates 60%; condensation is light after buckling the shed, and has less effect on light transmission than PE shed film, but after using for a period of time, due to the precipitation of plasticizer and adhesion of dust, the light transmittance decreases.
2. The PVC bag has excellent moisture retention and low thermal conductivity, especially the transmittance of the long wave radiation of 6-15 μm emitted from the night surface is small, the PVC plastic bag is only about 20% (PE shed film is more than 70%), the shed temperature The average temperature increase of ground temperature is 1.23 ℃ and 1.05 ℃ higher than that of PE shed film, respectively.
3. The PVC bag has good air tightness, the permeability to nitrogen, oxygen and carbon dioxide is 3.0, 9.0 and 75 (× 10-14cm3 / mm · cm2 · S · Pa), but the water vapor permeability (6.9 × 103g / mm · 24h · m2 · Pa) is larger than LDPE film.