... kraft bag 3.use for industrial bag closing 100% spun polyester sewing thread 12/4 Weight/cone: 200~250g, 8oz, 1 ... ~10kg, 4.5~20lb1)high quality Spun Polyester Bag Closing Threads ... . Industrial closing machines: Cone weight 1kg, 2.5lb, 2 kg, 4.5lb, 5lb, 3kg, 4kg, 5kg, 18lb, 9kg, 20lb & ... were using for some automatic plantsewing works applications. 12/4 100% polyester sewing thread