A human hair is approximately 70 micrometers in diameter. At the same time, advanced ultra-fine fibers can be only a few micrometers across—and specialized technologies can push fiber dimensions toward the submicron scale. In microfiber production, PET resin is more than simply a conventional polyester raw material. As fiber structures become finer and more complex,
Cationic dyeable polyester refers to polyester produced by chemical modification, typically by introducing sulfonic acid groups during PET polymerization, thereby enabling it to be dyed with cationic dyes. Its processing characteristics are particularly evident in both the spinning (POY) and texturing (DTY) stages. 1. Differences in Raw Materials and Basic Properties Lower melting point:The melting
PET chips are usually sorted into bright, semi-dull, or full-dull grades, based on how much titanium dioxide (TiO₂) they contain. But here's the strange part: at the very same spinning position, switching from semi-dull to bright chips can suddenly make spinnability much worse. Semi-dull and bright differ by only a small amount of TiO₂. So
