The reasons for the uneven thickness of non-woven fabric

Update:14 Mar 2020
Summary:

The reasons for the uneven thickness of non-woven fabri […]

The reasons for the uneven thickness of non-woven fabrics under the same processing conditions may have the following points:
(I) Low-melting fibers and conventional fibers are not uniformly mixed with cotton: different fibers have different cohesion. Generally speaking, low-melting fibers have greater cohesion than conventional fibers and are less likely to disperse. For example, Japan 4080, South Korea 4080, South Asia 4080, or Far East 4080 have different cohesive forces. If the low melting point fibers are unevenly distributed, the low melting point fiber content is less, because a sufficient network structure cannot be formed, and the non-woven fabric is thin. Relative to the low-melting point fiber content is thicker.
(2) Incomplete melting of low melting point fibers: Incomplete melting of low melting point fibers is mainly due to insufficient temperature. For non-woven fabrics with low basis weight, it is not easy to cause insufficient temperature problems, but for high basis weight, high The thickness of the product requires special attention. Non-woven fabrics located on the edge have sufficient heat. Non-woven fabrics are usually thicker. Non-woven fabrics located in the middle part, because the heat is not enough to form a thin non-woven fabric.
(3) High shrinkage of fibers: Whether it is conventional fibers or low-melting fibers, if the hot air shrinkage of the fibers is too high, uneven thickness problems are likely to occur due to shrinkage problems during the production of non-woven fabrics.