SK600EM is an upright, double zipper bag making machine which is an efficient and advanced bag making machine. It features a fully automatic three-sided sealing system that ensures the bag is securely sealed on all three sides. It is suitable for all kinds of heat sealing composite materials. This double zipper bag making machine, the bag making speed is also very good, the fastest is: 180 sections/min (of course, the actual speed depends on the material and bag shape) Our bag making machine can preset the number of bags, which can save you a lot of time. If you are making food bags, our vertical double zipper bag making machine is the best.