Why Do Sanitary Napkins and Diapers Use PE Breathable Film?

PE Breathable Film is an essential material for diapers. The structure of diapers is divided into 3 layers: surface covering layer, absorbent core layer and bottom layer.

The surface layer of diapers is made of non-woven fabric, the absorbent core layer is water-absorbing beads and fluff fibers, and the bottom layer is mainly made of PE film or PE film + non-woven fabric. The main purpose of PE breathable bottom film is to prevent leakage. Urine.

What is a breathable membrane?

Breathable film generally refers to PE functional materials with environmental protection, water-proof and breathable, mainly used for the bottom film of women's sanitary napkins, pad bottom film, baby diaper bottom film, etc., compounded with non-woven fabrics, and widely used in medical protective clothing , Medical mattresses for isolation clothing, disposable beds, home textiles, etc. Whether the breathable base film is breathable or not, in addition to its own material function, the process is also very important.

Production process of breathable membrane:

1. Cast compounding. This process relies on the viscous compounding of the plastic itself after thermal melting of plastic particles. The disadvantage is that it is hardly breathable. Later, there was no way to use this process to produce a real high-ventilation, high-temperature-resistant, waterproof and breathable membrane throughout the world.

2. Glue spraying or squeegee compounding (hot melt compounding). This process was first applied to sanitary napkins, diapers, and protective clothing. At present, almost all domestic manufacturers use this process to produce highly breathable waterproof and breathable materials. The disadvantage is that the air flow is relatively low, because the micropores in the middle air-permeable membrane are actually blocked by hot melt adhesive. In addition, the most fatal disadvantage is that the temperature resistance is very low, and it can only withstand a temperature of 60 degrees. Because this glue is actually a pressure-sensitive adhesive (self-adhesive). Therefore, this waterproof and breathable membrane can only be a fake and shoddy product of a real waterproof and breathable membrane, and there is no market at all in European and American countries.

3. Hot pressing compound. At present, the domestic market is mixed, and there are actually very few manufacturers that produce real waterproof and breathable membranes. Many factories or sellers say that their waterproof and breathable membranes are good. Almost most of the users have never thought that the waterproof and breathable membranes provided by some manufacturers are not waterproof at all. . In fact, the real waterproof and breathable membrane should be highly breathable, high temperature resistant, anti-aging, and the hydrostatic pressure should reach more than 2 meters. The production process should be pure thermal compound technology, without glue, so it can reach a temperature resistance of more than 110 degrees, high-strength anti-aging, this is currently a domestic product that can really meet the EU standard, and it is the latest domestic technology.

Application of breathable membrane in diapers:

The main factors that determine the air permeability are the number of air holes and the manufacturing process of the air-permeable bottom film. The main things to pay attention to are colloids, including urine gel and structural glue.

Although the amount of structural adhesive used in diapers is not large, the selection of high-quality structural adhesives and breathable membranes and other raw materials can ensure the high quality of diapers, which is beneficial to the safety, health and comfort of infants and young children.

With excellent products and services, Zhejiang Hengyao New Material Co., Ltd. provides advanced, high-quality PE breathable film and non-woven raw materials for sanitary products companies such as feminine care products, infant and adult diapers and nursing pads. Customers provide a full range of product solutions.