Processing And Production Technology Of PE Breathable Film
1. Cast compounding. This kind of processing technology is to rely on the viscosity of the plastic itself to compound after hot-melting plastic particles. In fact, this is a very common non-woven fabric coating. The disadvantage is that it is hardly breathable. At present, there is no highly breathable PE breathable film
produced by this process.
2. Glue spraying or squeegee compounding (hot melt compounding). This process was first applied to sanitary napkins, diapers, and protective clothing. At present, some manufacturers are still using this process to produce highly breathable waterproof and breathable materials. Since this glue is actually a pressure-sensitive adhesive, this PE breathable film
can only be a shrunken version of the real waterproof breathable membrane, and the glue will be opened soon after being placed for a period of time.
3. Hot pressing compound. At present, there are already many manufacturers using this process, and the application is becoming more and more mature, which has well realized the high air permeability, high temperature resistance, anti-aging and other properties of PE breathable film.
Application Of PE Breathable Film
PE breathable film
is a new type of waterproof material that has appeared in recent years, and it is the core item in disposable sanitary products. During the epidemic, PE breathable film played an important role, because it is the most important raw material for making protective clothing. It not only needs to block germs, but also ensure ventilation, otherwise it is easy to burn people, so PE breathable film is indispensable. .
The Principle Of PE Breathable Film
The PE breathable film
is made by adding about 50% special calcium carbonate to the LDPE/LLDPE polyethylene resin carrier for blending, and then directional stretching at a certain ratio after being extruded into a film.
Since polyethylene resin is a thermoplastic material, it can be stretched and crystallized under certain conditions. During stretching, interfacial peeling occurs between the polymer and calcium carbonate particles, and interconnected meandering pores are formed around the calcium carbonate particles. Or channels, it is these pores and channels that give the film its breathable (wet) function, thereby communicating the environment on both sides of the film.