Wenzhou Detai has innovating experience in valve bag, multi-layer paper bag over 20 years, and possesses core technology in producing multi-layer paper bag, valve bag, paste bottom bag, open mouth bag, paper-plastic lamination bag, cleft film suture line, engineering fiber, etc. These technologies are widely used in various fields, such as chemical valve bag(titanium dioxide, carbon black), building material valve bag(cement, thermal mortar), grain valve bag(rice, flour, starch), livestock husba