The opening process is completed through two mechanical actions: pulling and crushing. After the raw materials are fed by the feeding roller and transported at a constant speed, the angle nails and serrated scrapers tear the compacted fibers at high speed, and the dust rods and grates use centrifugal force to screen out sand, debris, etc. The production follows the "first loosening then crushing, more loosening and less crushing" principle. For cotton-based raw materials, the impurities are removed earlier using multiple levels of impact; for chemical fibers, which have no impurities and are prone to static electricity, the use of low-speed comb needles for opening reduces fiber breakage. Modern production lines adopt three-stage progressive opening: the first stage removes large foreign objects through coarse opening, the second stage divides fibers into bundles, and the third stage mixes fibers evenly. The output fibers are fluffy and uniform, directly connecting to subsequent processes such as carding and needle-punched non-woven fabric.
