Package bag common types: flexible packaging material to be made final before you can use all kinds of bags. Bag in two ways, one is the use of packaging manufacturers use roll film in the automatic filling and packaging machines, packaging and molded into a variety of bags; the other is due to the mechanism of the bag and then into a variety of bags filled contents . http://www.lyguosheng.net/ precise control of professional bag, pouch-type appearance, bag changes, a pouch type more, therefore, in a considerable number of cases, are first made bags. The main varieties of bags are: triangular envelope (palms envelope), back seal bags, folding help (organ bags), upright bags.