Application of non-woven materials

Application of non-woven materials

1). Non-woven material

Non-woven materials are composite materials processed through non-woven manufacturing processes using various types of fibers, and belong to industrial textiles. Non-woven material production processes include spunlace, heat sealing, pulp air-laid, wet process, spunbond, meltblown, needle punching, etc. Non-woven materials have the characteristics of porous and loose structure, good processability, light and thin materials, and low prices. They have broad application prospects in the fields of household appliances, automobile manufacturing, and construction.

2). Principle of sound insulation

Non-woven material has the advantages of numerous pores of fiber accumulation, low weight, excellent mechanical properties and low price, and is an ideal porous sound-absorbing material. According to the sound absorption mechanism of porous sound-absorbing materials, when sound waves are incident on the surface of the material, the sound waves vibrate and cause air movement in the voids within the material and the pores of the fibers. The air itself has the function of attenuating high-frequency sound waves. At the same time, the movement of the air causes friction between the fiber and the fiber and the inner hole wall of the fiber. Due to the friction and viscous force, part of the sound energy is converted into heat energy and the sound wave is attenuated.

The non-woven fabric felt has a loose and porous structure, and a large amount of air that is not easy to flow can be stored inside. Therefore, the voids in the textile material and the air in the pores can only exchange heat with the surrounding environment in a fixed manner, which causes a small loss of heat energy, which makes the non-woven material have better thermal insulation properties.

3). Application of air conditioner

In household air conditioners, the level of noise is a very important performance indicator, which directly affects consumers' experience. The purpose of split air conditioners is to place strong noise sources such as compressors outdoors to reduce the impact on the indoor sound environment. The noise of the outdoor unit comes from the noise of components such as axial fans, blades, compressors, etc.; the second is the impact and vibration of the above components and other parts of the body, especially when they resonate, the noise is relatively large. Wrap sound insulation pads around the above components can reduce the noise intensity very well. Therefore, sound insulation pads are indispensable in air conditioning accessories.

Air conditioners can be divided into fixed frequency air conditioners and inverter air conditioners. Inverter air conditioners are popular in the market due to their high energy efficiency and precise temperature control. Compared with fixed frequency air conditioners, inverter air conditioners use more complicated frequency conversion control circuits and electronic expansion valves. Although there is almost no noise during low-frequency operation, strong high-frequency noise will be generated during high-frequency operation. Therefore, fixed frequency air conditioners only need to use 1-2 pieces of soundproof cotton, while inverter air conditioners need to use 3-4 pieces to reduce the unnecessary noise caused by frequency conversion.

4). Application on the car

There are many types of non-woven materials required for automobile production, and the requirements for the production process of non-woven materials are also more complicated. Different from non-woven materials in air conditioners, non-woven materials on automobiles are used in small interior spaces, and they come in contact with the human body more frequently. If the non-woven materials have peculiar smells, it will seriously affect the comfort of the vehicle. Therefore, non-woven materials used for automotive interiors need to pass a series of certifications and tests such as TS16949 quality management system certification, automotive interior materials CCC certification, and odor detection.

According to the function of non-woven materials for automobiles, they can be divided into: ①molded interior parts, used for roof, rear hatch, door interior and headrest, molded carpet, etc.; ② sound insulation materials (sound, Thermal insulation materials, fluffy fiber-based cushions can be molded); ③ three types of composite laminate materials (high-performance fiber, natural fiber non-woven sheet, glass fiber non-woven sheet and others).

non woven materials

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