What is the reason for the uneven thickness of non-woven fabrics produced under the same conditions

Under the same production process, the non-woven fabrics produced will also have different soft and hard thicknesses. There are some differences that cannot be controlled. Let's talk about the reasons for the differences in non-woven fabrics under the same production process. First of all, there are probably the following reasons for the difference in softness and hardness of non-woven fabrics under the same production process. 1. High fiber shortening rate will also cause uneven softness and hardness of non-woven fabrics. 2. The low melting point fiber is not completely melted to form a soft non-woven fabric; 3. The part with higher low melting point content is harder, and the part with lower content is softer; low melting point fiber and conventional fiber are mixed unevenly. During the production of non-woven fabrics, the problem of uneven thickness also simply occurs due to the problem of shortening. Whether it is conventional fiber or low-melting fiber, if the fiber has a high shortening rate of hot air. This also causes the high fiber shortening rate. The non-woven fabrics located on the margins are generally thicker due to sufficient heat, and the non-woven fabrics located in the central part lack a thinner non-woven fabric due to simpler heat. Generally, it is not easy to cause temperature failure, but for products with high basis weight and high thickness, special attention must be paid to whether it is satisfied. The incomplete melting of the low-melting fiber is mainly due to the inability of the temperature, regarding non-woven fabrics with low basis weight. It also causes the incomplete melting of the low-melting fiber. Due to the inability to form a satisfactory network structure, the non-woven fabric is thinner, and is relatively thicker than the local area with more low-melting fiber content. For example, Japan 4080, South Korea 4080, South Asia 4080 or Far East 4080 have different cohesive forces. If the low-melting fiber is unevenly dispersed, the low-melting fiber content is less. Originally, different fibers have different cohesive forces. Generally speaking, low-melting-point fibers have greater cohesion than conventional fibers, and they are not easy to disperse. This also causes the uneven blending of low-melting fiber and conventional fiber.