Why is the weight of needle-punched non-woven fabrics unstable?

Why is the weight of needle-punched non-woven fabrics unstable?　Needle-punched non-woven fabrics are made by carding the non-woven fabric raw materials through a carding machine and then needle punching multiple layers of raw materials. In the combing process, sometimes due to uneven combing, there will be a slight difference in the final product weight, which will not be too much in general. The final product quality has a great relationship with the quality of the equipment and the technical level of the technicians. The series of needle punched non-woven fabrics are formed through fine carding, multiple precision needle punching or proper hot rolling. On the basis of introducing two high-precision acupuncture production lines at home and abroad, high-quality fibers are selected. Through the coordination of different production processes and the matching of different materials. Hundreds of different products are currently circulating on the market, including geotextiles, geomembranes, velvet fabrics, speaker blankets, electric blanket cotton, embroidered cotton, clothing cotton, Christmas crafts, artificial leather base fabrics, and special fabrics for filter materials.