Why is the Tea/Coffee Bag ES Nonwoven Fabric produced under the same processing conditions uneven in thickness
The reasons for the uneven thickness of Tea/Coffee Bag ES Nonwoven Fabric under the same processing conditions may be as follows:
(1) Uneven blending of low melting point fibers and conventional fibers: Different fibers have different cohesion forces. Generally speaking, low melting point fibers have greater cohesion than conventional fibers and are less likely to disperse. Uneven distribution of fibers, low-melting-point fiber content is less, because it cannot form a sufficient network structure, Tea/Coffee Bag ES Nonwoven Fabric is thinner, and it is thicker than the part with more low-melting-point fiber content.
(2) Incomplete melting of low-melting-point fibers: Incomplete melting of low-melting-point fibers is mainly due to insufficient temperature. For Tea/Coffee Bag ES Nonwoven Fabric with a low basis weight, it is usually not easy to cause insufficient temperature problems, but for high Basis weight, products with high thickness need to pay special attention to whether it is enough. The Tea/Coffee Bag ES Nonwoven Fabric located on the edge has enough heat, so the nonwoven fabric is usually thicker, and the nonwoven fabric located in the middle part, because the heat is more likely to be insufficient to form a thinner nonwoven fabric,
(3) High fiber shrinkage rate: No matter it is conventional fiber or low-melting point fiber, if the hot air shrinkage rate of the fiber is high, the shrinkage problem during the production of Tea/Coffee Bag ES Nonwoven Fabric is also prone to uneven thickness.