80700 Double-needle 4 thread Sewing Machine This heavy-duty sewing machine features a 2-needle, 4-thread double chainstitch design with an enlarged sewing space, allowing simultaneous stitching of leak-proof strips. Optimized for container bags with filler tubes, discharge tubes, and top covers, it comes equipped with pneumatic presser foot lift and an electric-controlled heated chain thread cutter. Filler cords can also be installed upon special request, making it highly versatile for industrial bulk bag production.