Meltblown nonwoven fabric is a kind of nonwoven fabric with ultra-fine fiber structure prepared by melt-blown process and the stretching action of high-pressure hot air. Meltblown nonwovens have become more and more important filter materials due to their excellent filtration performance, high yield and simple processing technology. The filter material prepared by melt-blown method has adjustable fiber fineness, messy and fluffy three-dimensional structure, and high filtration efficiency. It plays an important role in the fields of medical and health, food chemical industry, microelectronics, environmental protection and so on.
On the premise that other process parameters remain unchanged, the hot air pressure has a great influence on the performance of the non-woven fabric. As the hot air pressure gradually increases, the air permeability of the product gradually decreases, that is, the air permeability decreases. After the fibers are ejected from the spinneret holes, they are further stretched and refined under the traction of hot air. Higher hot air pressure is more conducive to fiber refinement. Therefore, as the hot air pressure gradually increases, the fiber diameter also becomes thinner. When countless fibers are disorderly and irregularly stacked on the mesh equipment to form meltblown non-woven products, the finer the fibers, the easier it is to form non-woven fabrics with high porosity and high specific surface area. The pore size is relatively small, so the interception efficiency of particles is also high.
On the premise that other process parameters remain unchanged, the hot air pressure has a great influence on the performance of the non-woven fabric. As the temperature of the hot air gradually increases,
The breathability of the product decreases gradually, that is, the breathability decreases. After the fibers are ejected from the spinneret holes, they are further refined under the pulling of hot air. Higher hot air temperature can provide more heat, thus slowing down the fiber cooling process, which is more conducive to fiber drawing and refinement. Therefore, as the hot air temperature gradually increases, the fiber diameter becomes thinner. When countless fibers are randomly stacked and bonded on a mesh device to form a meltblown nonwoven product, the finer fibers are more likely to form a nonwoven fabric with a high porosity and high specific surface area structure. The pore size is relatively small, so the interception efficiency of particles is also high.
When the PET meltblown nonwoven is prepared by the meltblown method, the hot air pressure, hot air temperature and resin viscosity have a great influence on the performance of the PET meltblown nonwoven. Increasing the hot air pressure and temperature, reducing the viscosity of the PET resin, is conducive to the formation of a fine-diameter fiber structure, and is conducive to improving the retention efficiency of particles.
Melt-blown non-woven fabrics are one of the fastest-growing non-woven fabrics, and are known as the one-step polymer production process with the shortest process in foreign countries. Its products have many obvious advantages such as high filtration efficiency, low resistance, softness, and the network can bind and bond itself. Therefore, it is widely used in various countries. Its main uses are medium-efficiency and sub-efficient filtration, including air filtration, acid breaking. Liquid filtration, food hygiene filtration, industrial dust mask production, etc. In addition, it can also be used as medical and sanitary products, industrial precision wipes, thermal insulation materials, oil-absorbing materials, battery separators, imitation leather base cloth, etc. It outperforms its traditional textile counterparts in many respects. With the continuous development of post-processing technology, the application fields of meltblown non-woven fabrics will be more extensive.
1. Application in the field of air purification
Used in air purifiers, as sub-efficient, high-efficiency air filter and coarse and medium-efficiency air filtration for larger flow rates. It has the advantages of low resistance, high strength, excellent acid and alkali resistance, corrosion resistance, stable efficiency, long service life and low price. There is no lint phenomenon that the filter material falls off in the gas purified with it.
2. Application in the field of health care
The dust-proof port made of melt-blown cloth has small breathing resistance, no stuffiness, and dust-proof efficiency as high as 99%. It is widely used in hospitals, food processing, mines and other workplaces that require dust-proof and anti-bacteria after special treatment. The anti-inflammatory and analgesic film made of the film has good air permeability, no toxic and side effects, and is convenient to use.
3. Liquid filter material and battery separator
Polypropylene meltblown cloth has very good performance for filtering acidic and alkaline liquids, oils, oils, etc. It has been regarded as a good diaphragm material by the battery industry at home and abroad, and has been widely used, not only reducing battery costs, but also The process is simplified, and the weight and volume of the battery are greatly reduced.
4. Oil-absorbing materials and industrial wipes
Various oil absorbing materials made of polypropylene meltblown cloth can absorb 14-15 times of its own weight. It is widely used in environmental protection projects and oil-water separation projects. In addition, in industrial production, it can be used as a clean material for oil and dust. These applications give full play to the characteristics of polypropylene itself and the adsorption of ultrafine fibers made by meltblown.
5. Thermal material
The average diameter of the melt-blown ultrafine fibers is between 0.5 and 5 m, the specific surface area is large, a large number of fine pores are formed in the cloth, and the porosity is high. A large amount of air is stored in this structure, which can effectively prevent heat loss and has excellent thermal insulation, and is widely used in the production of clothing and various thermal insulation materials. Such as leather jackets, ski shirts, winter clothing, cotton cloth, etc., with the advantages of light weight, warmth, no moisture absorption, good air permeability, no mildew and so on. There is also non woven fabric slitting machine at SUNTECH. Any interest, please click the link to discover more.