Back and center- seal pouches These pouches are used for a wide range of dry food applications,such as coffee,chips,candies. Zhenghui ... of our pouches(1) Our back –seal pouches are made of high oxygen and gas barrier poly film however the film can ... .Aplication: These pouches are used for a wide range of dry food applications,such as coffee,chips,candies,biscuits,nuts. ( function ...