Breathable membrane is a kind of environment-friendly functional material for breathable (vapor) and water (liquid, bacteria and dust). The appearance of microporous breathable membrane has a history of more than 20 years, and has developed rapidly in recent 10 years. China is in the primary stage in terms of technology, market and application. Polyolefin breathable membrane is prepared by adding inert filler into PE or PP carrier, making membrane and stretching. For personal hygiene care products, breathable membrane is an upgraded product of ordinary waterproof membrane. The breathable membrane and ordinary membrane cannot be simply replaced. Whether the structural design of the final product is reasonable or not is very important to the embodiment of the breathable effect of the breathable membrane!

According to my professional experience, this paper discusses with you the performance setting, manufacturing technology, control means, application field, development trend and other issues of breathable membrane that people in employment pay attention to, hoping to be helpful to the production and use of breathable membrane.
Ventilation principle of breathable membrane
In short, the function of breathable membrane is water-proof and breathable (moisture).
Because of the structural characteristics of the breathable membrane, it also has the barrier effect on other liquids, dust and bacteria, so that it has a wider application space.
How does the breathable membrane realize the breathable function?
Take the most commonly used permeable membrane with PE as the carrier as an example.
Basic film forming principle: PE + CaCO3 --- film forming --- stretching --- breathable film
Permeability (vapor) refers to the ability of gas (vapor) body to penetrate materials under certain conditions.

Principle of using breathable membrane

1. The inherent characteristics of the breathable membrane are the basis for the final embodiment of the breathable effect, but the structural design of personal health care products is the key;
2. As a water barrier material, the safety of breathable membrane (water barrier) is the premise, and the permeability can be discussed only on the premise of ensuring safety;
3. It is necessary to use breathable membrane materials for nursing products with "wide relatively wide", "thin thin, close fitting", "bag relatively closed" structure and relatively long-term use (such as diapers, pads, etc.);
4. Compared with ordinary PE embossed film, breathable film has its inherent shortcomings. Therefore, the design of products should be good at avoiding shortcomings and giving full play to their strengths. The thermal stability of the film is relatively low, such as the color of the film is monotonous, and the lateral permeability is poor;
5. The final ventilation effect is directly proportional to the actual ventilation area of the breathable membrane. When designing products, we should cherish and protect the effective air permeability area;
6. The design of the final product should consider the convection of the small environment;
7. The performance of breathable products on users has time lag. The efficacy of breathable products needs publicity.
Composite breathable membrane
Breathable membrane is a very good functional material, but it still has many areas to be improved, such as CD strength, appearance, cost, hand feel, etc. Therefore, non-woven fabrics and their composite materials should be accumulated.
Because we can use non-woven fabrics with different materials, different structures and different base weights, combined with different composite methods, we can derive various types of composite materials to meet the use requirements of different products and consumer classes
Nanjing Zhuye Precision Machinery Co., Ltd. has a professional sheet production line. The company's main sheet machine manufacturing production lines include: pet/pret sheet production line, PP sheet production line, PP vacuum profile extrusion production line, pp/pc vacuum plate production line, pc/pp corrugated plate production line, PVDF photovoltaic backplane production line, PMMA acrylic sheet production line, PE waterproof coiled material production line, high-performance barrier sheet production line, optical panel production line, Multi layer co extrusion sheet production line, etc.
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