Abstract: Effectively reducing size-pickup not only can significantly reduce sizing costs and benefit textile mills, but also can reduce dust fall in weaving process and improve production environment. For printing & dyeing plants, this means reducing a large amount of sludge. This is currently the best solution for both textile mills and printing & dyeing plants. The paper introduces the necessary conditions for realizing low size-pickup sizing: selecting proper size with good adhesive, filming and abrasion-resistant properties and working out proper low add-on sizing process. Practical experiment was carried out on this new process,related size formula, the sizing process for 50S pure polyester fiber yarn and the sizing quality of this new process were analyzed and studied.

Key words: low size-pickup sizing; sizing costs; sizing process