Supply square bottom valve bags at reasonable prices

Does anyone know? Square bottom valve bags, also known as paste bottom bags, the bottom of ordinary open bags is simply sewn into a straight line, while the top and bottom of square bottom valve bags have rectangular bottoms that are folded manually or machine-brushed. Glue, hot press to form two square bottoms, upper and lower, and make a filling valve port on the upper right corner. Square bottom valve bags are divided into paper-plastic composite, woven cloth, kraft paper, etc. according to their materials. All three materials have moisture-proof effect.
If a filling machine is used to fill materials, pores of different densities can be punched in the square bottom valve bag body according to the filling requirements.
Square bottom valve bag is an internationally popular packaging style, which is convenient for stacking, beautiful and elegant, and convenient for loading, unloading and transportation.