Guangdong Huaping Hygiene Material Industrial Co.,Ltdmain products include PE breathable membrane,PE breathable film,PE perforated film,Multicolor printed film,etc.The series of products produced by Huaping are widely used in personal hygiene care ,such as sanitary napkins,sanitary pads,baby diapers,adult diapers,protective clothing,cosmetic medical supplies and other disposable items.
disposable medical protective clothing materials need to meet the requirements of “three resistances and one resistance” (that is, water repellency, blood repellency, alcohol repellency and antistatic) at the micro-nano level. This composite material can be composited by different materials, such as polyethylene/polypropylene spunbonded nonwovens, composited with breathable microporous films or other nonwovens, or composited with spunlace nonwovens and breathable microporous films, or used Wood paddle composite spunlace nonwovens. In addition, there are some membrane materials made of polytetrafluoroethylene that can be used in the production of protective clothing fabrics. In the composite of these materials, the breathable microporous film is particularly important.
The so-called breathable film is a functional inorganic product that is evenly added to the polyolefin raw material, so that the product will have pores due to high-stretching during the film forming process, so that it has the function of ventilation and moisture conduction; the function of the breathable film In short: water-proof, breathable (moisture), take the commonly used breathable membrane as a carrier of PE as an example.
The principle of ventilation
The principle is simple: inorganic matter + stretching = micropores. In fact, the operation is very particular. Only micropores with appropriate size and uniform distribution are effective.
Basic film-forming principle of breathable film
Breathable film film forming principle: PE+CaCO3 (masterbatch) — film forming — stretching — breathable filmThe PE breathable film is made by adding about 50% of 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 winding 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.
Mechanism of breathable membrane
When the water vapor concentration on one side of the membrane is greater than the environment on the other side of the membrane, a humidity gradient pressure difference is formed. This provides the basic conditions for gas (steam) convection, and the humidity environment on both sides of the film tends to be relatively balanced due to the formation of convection.
The breathable membrane is used as a water-proof membrane and has a barrier effect on liquids. Because there are many channels in the film, the tortuous channels formed by it have a large “length-to-diameter ratio” (L/D), which can be understood as capillaries. Therefore, under the same liquid (such as water) and the same pressure, as long as the liquid column height of the capillary is smaller than the length of the capillary, the liquid can be guaranteed not to leak out.
Our domestic website:gdhuaping.com.cn
Phone:
Contact Now