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The inflatable shaft has many names, but it works the same way. Inflation shaft, inflation sleeve is very convenient to use, fast, just bring your own air source, air pressure control in the 6-8 kg/CM2 range, need to lock the external parts (such as circular paper tube) , as long as the air gun on the inflation axis of the air nozzle can be completed, against the external parts (such as circular paper tube) , to relax the paper discharge, remove by pressing a hand on a sliding outer part of the nozzle, such as a circular paper tube.