What are the factors affecting the permeability of plastic film?
From the effect of diamond abrasives into thermodynamic and kinetic considerations of nuclear growth, mainly include: substrate (substrate) and substrate material (substrate) pretreatment, substrate (substrate) in furnace processing, sedimentary source (gas concentration carbon), substrate (substrate), temperature effect the gas pressure and the hydrogen atoms in the deposition process.
Water column height. In the water permeability test, the water quantity in the water cup is changed, indicating that the water column height has no influence on the test result, so the water quantity is not strictly controlled, and the amount of the water can be poured into the water permeable cup with proper amount of water.
Film properties. The permeability of polymer film is related to its structure. The permeability of polar film is larger than that of non-polar film, and the amorphous film is larger than crystalline film. In addition, the permeability coefficients of some polymer films are similar to those of saturated vapor pressure. The permeability coefficient of polyethylene and nylon films is several times higher than that of moisture permeability. This is mainly due to the formation of pores between crystals or grains, which facilitates the flow of liquid water.
