Do you Know the Production Process of Hot Air Nonwoven?

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Do you Know the Production Process of Hot Air Nonwoven?

Jul. 13, 2021

The production process of Hot Air Nonwovens: Hot air nonwovens can be realized by different heating methods. The bonding method and process, fiber type, carding process and fiber web structure will ultimately affect the performance and appearance of the nonwoven.

Hot roll bonding can be used for fiber webs containing low melting point fibers or bi-component fibers. Hot air bonding can also be used. For common thermoplastic fibers and their blends with non-thermoplastic fibers, hot roll bonding can be used. With the same web formation process, the hot bonding process has an important influence on the properties of the nonwoven and determines the use of the product.

Hot Air Nonwovens

Hot Air Nonwovens

The main factors affecting the performance of hot air nonwovens:

The heat carrier is hot air, which is in the bonding process. When hot air penetrates the web, it transfers heat to the fibers, which melts and creates bonding. Therefore, the temperature, pressure, fiber heating time and cooling rate of the hot air will directly affect the performance and quality of the product.

As the hot air temperature increases, the vertical and horizontal strength of the product will increase accordingly. However, the softness of the product decreases and becomes harder to the touch. Table 1 shows the variation of strength and softness with temperature when producing 16g/m product.

The pressure should be increased accordingly. Hot air pressure is an important parameter affecting the Hot Air Bonded Product. In general, as the basis weight and thickness of the web increases. In order for the hot air to pass smoothly through the web, but before the web is bonded, too high a pressure can damage its original structure and cause the web to be uneven.

Sufficient heating time must be available. During the production process, the heating time of the fiber web depends on the production speed. It is important to ensure that the fibers are completely melted. When changing the production speed, the hot air temperature and air pressure must be increased accordingly to ensure the stability of the product.

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