Doypack (Doypack) is a flexible packing bag with a horizontal support structure at the bottom, which can stand on its own regardless of whether the bag is opened or not without any support. The English name of the stand-up bag originated from the French Thimonier Company. In 1963, Mr. M. Louisdoyen, the CEO of the French Thimonier Company, successfully applied for the patent of DOYPACK stand-up bag. Since then, DOYPACK has become the official name of the stand-up bag. By the 1990s, it was widely recognized in the American market and then popularized all over the world. Stand-up bag is a relatively new form of packaging, in the upgrade of product grade, strengthen the visual effect of shelves, portable, easy to use, fresh and sealing and many other aspects of the advantages. Stand-up bag is made of PET/PE structure lamination, according to the need to increase the oxygen protection layer, reduce the oxygen permeability rate, prolong the shelf life of the product. Application scope of stand-up bag: stand-up bag packaging is mainly used in fruit juice drinks, sports drinks, bottled drinking water, absorbable jelly, condiments and other products, in addition to the food industry, some washing supplies, daily cosmetics, medical supplies and other products are gradually increasing.