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The packaging bag refers to the bag used to pack various supplies, so that the goods are convenient to transport and easy to store in the process of production and circulation.
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Composite flexible packaging materials can be used only when they are finally made into various packaging bags. There are two ways to make bags, one is that the packaging manufacturers use the roll film in the automatic packaging machine filling, and molding packaging into a variety of bags; The other is due to the bag-making mechanism into various bags and then fill the contents. Due to the precise control of professional bag making, beautiful bag shape, large bag making changes, and many bag types, therefore, in quite a few cases, bags are made first. The main varieties of bags are: three-side sealing bag (palm sealing bag), back sealing bag, folding tip (organ bag), upright bag and so on.