During melt extrusion of PET to polyester fiber, sometimes IV of As-Spun fiber is higher than raw material chips. What is the reason of such rise?

During a process of polyester staple fiber production, while the IV (intrinsic viscosity) of PET granules is within 0.63-0.64 dl/g, the IV of as-spun fiber output from spinneret is around...

22 April 2022 9,201 3 View