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[ 2018-12-25 ] Why is the thickness of the nonwoven fabric uneven?

Author : Guide Nonwoven     
The reasons for the uneven thickness of the nonwoven fabric under the same processing conditions may have the following problems:

(1) Non-uniformity of low-melting fiber and conventional fiber blending: Different fibers have different cohesion. Generally speaking, low-melting fibers have greater cohesion than conventional fibers and are less likely to be dispersed. For example, Japan 4080, South Korea 4080, South Asia's 4080 or Far East's 4080 have different cohesion. If the low-melting fiber is unevenly dispersed, the low-melting fiber content is less, because the mesh structure cannot be formed, and the nonwoven fabric is thin. Relatively thicker than the low-melting fiber content.

(2) Incomplete melting of low-melting fiber: Incomplete melting of low-melting fiber, the main reason is that the temperature is not enough. For non-woven fabrics with low basis weight, it is usually not easy to produce insufficient temperature, but for high basis weight, high Thickness products require special attention. The nonwoven fabric at the edge has a thick enough nonwoven fabric because it has sufficient heat. The nonwoven fabric is located in the middle part, because the heat is less likely to form a thinner nonwoven fabric.

(3) High shrinkage of fiber: Whether it is conventional fiber or low-melting fiber, if the hot air shrinkage rate of the fiber is high, the problem of uneven thickness is likely to occur due to the shrinkage problem during the production of the nonwoven fabric.

The problem of static electricity generated during the production of nonwoven fabrics is mainly due to the fact that the moisture content in the air when the fibers are in contact with the clothing is too low, and can be divided into the following points:

(1) The weather is too dry and the humidity is not enough.

(b) When there is no oil on the fiber, there is no antistatic agent on the fiber. Since the moisture regain of the polyester cotton is 0.3%, the lack of an antistatic agent results in generation of static electricity during production.
(3) The fiber oil is low, and the relative electrostatic agent content will also generate static electricity.
(4) SILICONE polyester cotton has almost no moisture on the oil because of the special molecular structure of the oil.  It is relatively easy to generate static electricity during production.  Usually, the slip of the hand feels proportional to the static electricity.  The smoother SILICONE cotton is more static.  Big.
(5) Methods to prevent static electricity In addition to humidification in the production work room, it is also an important task to effectively eliminate oil-free cotton during the feeding stage.

The reason for the soft and hard unevenness of the nonwoven fabric under the same processing conditions is generally similar to the reason for the formation of uneven thickness. The main reasons may be the following:

(1) The low-melting fiber and the conventional fiber are unevenly mixed, the part with a higher low melting point content is harder, and the lower part is softer.

(2) The melting of the low melting point fiber is not complete, resulting in a softer nonwoven fabric

(3) The high shrinkage rate of the fiber also causes the problem of uneven softness and hardness of the nonwoven fabric.

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