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ZB 50S bottom gluing machine automatically feeding unclosed paper bag, after open bottom, insert bottom cardboard(not intermittent type),auto spray glue,bottom close and compaction out to realize the bottom close and cardboard insert function. This machine is controlled by toush screen, equipped 4 nozzles hot melt spraying system which can control the spraying length and quantity independently or synchronously. This machine spray glue evenly by high speed and precision, which can peoduce various kinds of paper bags.