The bottom valve pocket: commonly known as: paste bag, is a packaging efficiency, convenient transport packaging ideas under the guidance of birth.Bag of the overall appearance is square, very suitable for stacking transport;At the bottom of the valve port, convenient filling material, easy and sealing.Applied to a new type of green packaging, canned equipment can be divided into: paper-plastic composite valve pocket or multilayer paper valve pocket.Filled in order to convenient, can be punched on the bag body, convenient and gas discharge, prevent the filling bags.Paper in the middle can add a layer of plastic film, which is used to package need moistureproof products.