How to solve the problem of uneven thickness of spunbond nonwoven fabrics?

Dongguan Liansheng non-woven fabric manufacturer told you:

How to solve the problem of uneven thickness of non-woven fabrics? The reasons for uneven thickness of spunbond non woven fabrics under the same processing conditions may include the following:

High shrinkage rate of fibers: Whether it is conventional fibers or low melting point fibers, if the hot air shrinkage rate of fibers is too high, uneven thickness may also occur during the production of non-woven fabrics due to shrinkage issues.

Incomplete melting of low melting point fibers: The main reason for incomplete melting of low melting point fibers is insufficient temperature. For non-woven fabrics with lower base weight, it is usually not easy to have insufficient temperature. However, for products with high base weight and thickness, special attention should be paid to whether they are sufficient. Non woven fabrics located at the edges are usually thicker due to sufficient heat, and non-woven fabrics located in the middle section are usually thicker, Because the heat is easily insufficient to form a thinner non-woven fabric.

Uneven mixing of low melting point fibers and conventional fibers: Different fibers have different cohesive forces. Generally speaking, low melting point fibers have greater cohesive forces and are less easily dispersed than conventional fibers. If low melting point fibers are unevenly dispersed, the parts with less low melting point fiber content cannot form sufficient network structure, and non-woven fabrics are more durable, forming a thicker phenomenon in areas with more low melting point fiber content.

The problem of static electricity generated during the production of spunbond nonwoven fabrics is mainly caused by the low moisture content in the air when the fibers and needle fabrics come into contact, which can be divided into the following points:

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

2.When there is no oil on the fiber, there is no anti-static agent on the fiber. Because the moisture regain of polyester cotton is 0.3%, the lack of anti-static agents results in the generation of static electricity during production.

3.SILICONE polyester cotton, due to the special molecular structure of the oiling agent, contains almost no water on the oiling agent, making it relatively more prone to static electricity during production. Usually, the smoothness of the hand feel is directly proportional to static electricity, and the smoother the SILICONE cotton, the greater the static electricity.

4.The four methods for preventing static electricity are not only used to increase humidity in the production workshop, but also an important task in effectively removing oil-free cotton during the cotton feeding stage.