The Principle of Breathable PE Film for Diapers

The principle of raw material breathable PE film in diapers is mainly based on the micro porous structure and the humidity gradient pressure difference formed by the difference in water vapor concentration. China diaper backsheet PE film is formed by combining inorganic substances with stretching process to form micro pores with appropriate size and uniform distribution. These micropores allow water vapor to pass through, but prevent liquid from penetrating, thus achieving the functions of breathability and water isolation.

Specifically, the manufacturing process of dipaer breathable PE film back sheet involves adding inert fillers to polyethylene (PE) or polypropylene (PP) carriers, followed by film making and stretching processes to form thin films with microporous structures. These micropores allow water vapor to circulate between the two sides of the film, thereby regulating the humidity environment and achieving a breathable effect. In addition, the waterproof performance of breathable membranes depends on pore size and channel length, and is usually measured by water pressure resistance (Δ P).

The role of China diaper backsheet PE film mainly includes preventing urine leakage and providing good breathability. The bottom layer of diapers is usually made of PE film or a combination of PE film and non-woven fabric. The use of breathable film allows diapers to remain dry while effectively preventing urine leakage. The breathability of the breathable film enables diapers to better regulate humidity and reduce discomfort for babies during use.