... up (4)Piled in good order -------- Description of pe valve bag---------------- 1) Material: commonly HDPE or ... valve bags, plastic bags (heavy-duty packing bags), color film bags, paper-plastic bags, container bags, etc. 60 ... coating machine, one bag-making machine and two film blowing machines. At present, we have more than ... technical secondary school diploma. heavy duty film PE flat bottom valve bag