paper valve bag

1.specification:L*W*H in general have 12/13/15/18/21cm 2.Printing:1-4 colors 3.Material:woven, paper-plastic composite,full of paper 2-6layers,PE 4.usage:widely used in packaging to carbon black, silica,titanium dioxide, building materials, cellulose, chlorinated polyethylene and other chemical product , feed, sugar, starch powder.etc.packaging. 5.Feature:valve bag was cube loading, easy filling,easy to stack, stacked neatly packages,and high intensity, with a saving of raw materials, easy handing, moisture-proof,self-styled, anti-uv.