Single thread DADR & the Double thread DADR robust sewing machine closes the bag ends effectively. The main difference between single and double is that single thread is allocated into the machine
so we can say that the single needle stitches the bag continuously and the double-needle sews the bag with two linings. This twin needle, double thread give Parallel chain stitchings. The sewing
speed of the machine is approx 350 bags per hour and perform sewing jobs on all types of poly bags made from HDPE, PP, BOPP, JUTE Bags, etc.
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https://smartpackindia.com/items/bag-closing-machine/