As the global movement toward sustainable fashion continues to gain momentum, lightweight, cool-touch, and biodegradable knitted fabrics have become a major development trend for spring/summer apparel and casual knitwear. Drawing on years of experience in paper yarn R&D and knitting application development, we focus on the specialized optimization of fine-count paper yarns, with circular knitting as a key application area. By addressing the technical challenges associated with knitting fine-count paper yarns, we provide knitting mills and apparel brands worldwide with eco-friendly paper yarns that offer stable performance, excellent knittability, and distinctive aesthetics. Traditional paper yarns are generally produced in coarser counts and are mainly used for heavy-gauge sweaters. Fine-count paper yarns made with conventional processes often suffer from uneven yarn consistency, unstable tension, frequent yarn breakage during high-speed circular knitting, and excessive fabric defects. These issues significantly limit their use in fine weft-knitted products such as underwear, T-shirts, knitted base