Valve bags are made from 100% wood pulp paper, available in white kraft and natural kraft colors. The bag strength can be customized from 1 to 6 layers, with integrated printing and bag-making. Valve bags are typically made with square bottom design, commonly featuring a three-ply kraft paper with one layer of PE film inside, offering excellent moisture-proof, damp-proof, and leak-proof performance!

Paper-plastic composite bottom valve bags: Made by integrating kraft paper, composite resin, and woven fabric as base materials through extruded film lamination, forming a high-strength base material. The bag bottom is aligned and folded, sealed with environmentally friendly adhesive, manually flipped, to create packaging bags with a sealed bottom and an open top, with a reinforced cover paper made of kraft paper attached to the bottom!

Multi-layer kraft paper valve bags and paper-plastic composite valve bags are sealed at both top and bottom, leaving an opening for machine filling. The packaged products are filled into the valve bags through the filling opening under the action of pneumatic or mechanical power. The valve opening is moisture-proof, with both inward and outward orientations, ensuring a good sealing effect.