Plastic bags is a kind of plastic as raw material, used in the production of various supplies in the packaging bags, widely used in daily life and industrial production, has been widely welcomed by the people.
Some plastic bags are sealed, and some are breathable, so what is the cause of this situation?
We have learned in physics that the velocity of the gas is proportional to the exposed area of the film. When they reach a constant state, the amount of gas or different vapor permeated should be inversely proportional to the thickness of the film. This shows that when the thickness of the coating increases, the coating film also increases the isolation performance, the transmittance also decreases.
Since the effect of temperature on the air permeability is not large, the effect of the layer of paper outside the bag on the bag plays a major role.
