Reasons for uneven thickness of non-woven fabrics during production

The reasons for uneven thickness of non-woven fabrics during production

The shrinkage rate of fibers is relatively high

Whether it is conventional fibers or low melting point fibers, if the thermal shrinkage rate of the fibers is high, it is easy to cause uneven thickness during the production of non-woven fabrics due to shrinkage problems.

Incomplete melting of low melting point fibers

This situation is mainly due to insufficient temperature. For non-woven fabrics with low basis weight, it is usually not easy to encounter the problem of insufficient temperature, but for products with high basis weight and high thickness, special attention should be paid to whether the temperature is sufficient. For example, the non-woven fabric on the edge is usually thicker due to sufficient heat, while the non-woven fabric in the middle may form a thinner fabric due to insufficient heat.

Uneven mixing of low melting point fibers and conventional fibers in cotton

Due to different fibers having different gripping forces, low melting point fibers typically have greater gripping forces than conventional fibers. If the low melting point fibers are unevenly dispersed, the parts with lower content may not be able to form a sufficient mesh structure in a timely manner, resulting in thinner non-woven fabrics produced, and thicker ones compared to areas with higher low melting point fiber content.

Other factors

In addition, equipment factors may also lead to uneven thickness of non-woven fabrics. For example, whether the speed of the web laying machine is stable, whether the speed compensation is adjusted properly, and whether the hot stamping machine is adjusted properly may all affect the thickness uniformity of the non-woven fabric.

How to solve it

To address these issues, producers should ensure that the shrinkage rate of fibers is controlled within an appropriate range, ensure complete melting of low melting point fibers, adjust the mixing ratio and uniformity of fibers, and inspect and adjust production equipment to ensure stability and accuracy.

Please note that different factories and types of non-woven fabrics may encounter different specific problems during the production process. Therefore, when solving the problem of uneven thickness of non-woven fabrics, corresponding measures should be taken according to the specific situation, and experts in relevant fields should be consulted for more professional advice.

What are the reasons for static electricity generated during the production？

1. External factors may be due to excessively dry weather and insufficient humidity.

2.When there is no anti-static agent on the fiber, the moisture regain of polyester cotton is 0.3%, and the lack of anti-static agent results in the easy generation of static electricity during non-woven fabric production.

3. Low oil content in fibers and relatively low content of electrostatic agents can also generate static electricity.

4. In addition to humidifying the production workshop, it is also very important to effectively eliminate oil-free cotton during the feeding stage to prevent static electricity.

What are the reasons for uneven softness and hardness of non-woven fabrics ?

1.Due to the uneven mixing of low melting point fibers and conventional fibers, the parts with higher low melting point content are harder, while the parts with lower content are softer.

2.In addition, incomplete melting of low melting point fibers can also easily lead to the occurrence of softer non-woven fabrics.

3. A high shrinkage rate of fibers can also cause uneven softness and hardness of non-woven fabrics.