it is the long-term low operating rate taken by CS chip plants

First, it is the long-term low operating rate taken by CS chip plants, which gradually underpins chip prices. Nylon 6 CS chip plants have curtailed production significantly from 85% March, when CS chip plants were suffering losses at the end of the first quarter, to a yearly lowest rate at 55% in late November 2021. The production cut did not help to cease the decline in chip, and inventory has risen to as high as 23.5 days in mid-April and kept high around 15 days by mid-August. It has been a long time struggle for CS chip plants.