Spun Polyester Bag Closing Thread(12/4,20/6 and other specifications) Made of spun polyester fiber, TATH bag closing thread is with good silicone and knotless, and has high resistance to abrasion/ corrosion/ acid, is widely used in the agricultural field, industrial packing for sewing, closing open mouth bags, like sugar bags, pp woven sacks, multi-wall paper bags, sandbags, mesh bags, and others. TATH bag closing thread is suitable for high-speed bag packing systems such as NEWLONG, FISCHBEIN, UNION-SPECIAL. YAO-HAN, SIRUBA, JUKI, can effectively increase productivity in the sewing process. Main Uses Closing Bags. Product Features High Resistance to Abrasion/ Excellent Seam Strength & Appearance/ Chemical Resistance/ Without knot/ High Productivity/ Economical.