According to the different thickness of PVC film and its use, PVC bags, PVC cosmetic bags, stationery bags, craft jewelry bags, gift bags and other products are packaged. Many high-end product manufacturers generally use PVC bags for packaging, beauty products, and upgrade product grades, 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 light transmittance of the crop is small, and the wavelength of 0.3μm is only 20%, so it often becomes the material of the PVC bag, and the poly The ethylene (PE) shed film penetrates 60%; the condensation is light after the shed, and the effect on light transmission is smaller than that of the PE shed film. However, after a period of use, the dust is adhered due to the precipitation of the plasticizer, and the light transmittance is lowered.
2. PVC bag has excellent moisture retention and low thermal conductivity. In particular, the long-wave radiation transmittance of 6-15 μm emitted from the nighttime surface is small, and the PVC plastic bag is only about 20% (PE film is more than 70%). The average temperature increase of ground temperature is 1.23 ° C and 1.05 ° C higher than that of PE film.
3. PVC bag has good air tightness, and the gas permeability to nitrogen, oxygen and carbon dioxide is 3.0, 9.0 and 75 (×10-14cm3/mm·cm2·S·Pa), respectively, but water vapor permeability (6.9×103g/mm). · 24h · m2 · Pa) larger than LDPE film.
The above introduction about PVC bags is here, I hope to help you.