Sirospun and DREF-Siro Processes
topic
Sirospun (also written SiroSPUN) feeds two parallel rovings into the drafting system spaced 6–8 mm apart, allowing each strand to acquire some twist before merging and receiving final ply-like twist together. The product resembles a 2-ply yarn but is produced in one operation, with 20–30% less hairiness than equivalent singles ring-spun. Sirospun requires modified front roller and condensing geometry. Particularly used for wool and wool-blend yarn where two-ply structure improves fabric cover without the cost of a folding operation.
Role
Sirospun is a process innovation that reduces manufacturing steps (eliminates the separate folding/plying operation) while improving yarn structure, directly reducing production cost by 15–25% for two-ply equivalent yarns. Understanding Sirospun geometry and its quality limitations is essential for product development engineers working in wool, wool-blend, and premium cotton markets where two-ply yarn quality is required at single-yarn economics.