What are the types and uses of white kraft paper bags?

　　Based on material, they can be categorized as follows: a. Pure kraft paper bags; b. Paper-aluminum composite kraft paper bags (kraft paper laminated with aluminum foil); c. Woven bags combined with kraft paper (typically used for larger bag sizes).

　　Three-layer white kraft paper bags: These bags can be laminated with a layer of PP material on the paper to provide waterproof protection. They are made from imported Canadian white kraft paper and can also be customized with an additional inner liner bag or offered in full-color offset printing. Available in a sewn-bottom, open-mouth design, these bags boast eco-friendly and hygienic features. Multi-layer kraft paper bags come in both imported and domestically produced white kraft varieties, combining the strength of white kraft paper with the durability of newly-molded PP woven fabric. For added safety, a PE plastic liner can be inserted inside the bag, ensuring it meets strict food-grade standards. You can choose the perfect packaging option tailored to your needs. Available styles include: sewn-bottom open-mouth bags, glued-bottom open-mouth bags, as well as specialized valve-pocket and flat-bottom valve-pocket designs ideal for filling equipment. Among these, valve pockets and flat-bottom open-mouth bags remain the most popular choices—particularly favored by export-oriented businesses for their versatility and efficiency.

　　Multi-layer kraft paper bag

　　Multi-layer white kraft paper bags: (four-ply bags) — these are high-strength packaging solutions crafted from premium-quality white kraft paper and other materials. Typically, the outer layer is made from imported white kraft paper, while the inner layer uses imported yellow kraft paper; alternatively, a four-ply combination of yellow and white imported kraft paper can also be used. Leveraging the exceptional strength and durability of kraft paper, these bags offer excellent tear resistance. Additionally, a waterproof film can be applied to one of the paper layers, providing superior water- and moisture-proof properties. For added protection, an inner PE film liner can be incorporated—either in low-pressure or high-pressure versions. The bottom and top edges are sealed using either corrugated paper stitching or heat-sealing with hot-melt adhesive. These versatile packaging bags are ideally suited for products such as pigments, dyes, starch, food additives, plastics, chemical compounds, pharmaceutical raw materials, carbon black, and more.

　　Seamless bottom-opening kraft paper bag

　　Three-layer paper bags with PE inner liners: Made from imported Canadian white kraft paper, these bags are available for full-color offset printing. They feature a sewn-bottom, open-top design and boast eco-friendly and hygienic qualities. Available in both imported kraft paper and domestically produced white kraft paper, we can also provide food-grade inner liner options. All products come with QS quality certification. The primary function of the PE inner liner is to prevent moisture absorption. Our products meet stringent food hygiene standards, containing minimal levels of fine impurities, making them suitable for food-related inspections—including general commercial inspections as well as SGS-certified component testing. We ensure that all materials used are 100% virgin plastic and pure wood-pulp kraft paper, never incorporating recycled or reclaimed materials like regrind or secondary waste. This guarantees premium-quality performance. These bags are ideal for packaging powders, granules, flakes, and solid materials, offering neat and visually appealing stacking. They represent a sustainable, green packaging solution. Suitable applications include packaging pigments, dyes, starch, flour, food additives, plastics, chemical products, carbon black, and more.

　　Seamed Bottom Open-End Paper Bags: Seamed bottom bags come in two main types—paper-plastic composite and all-paper designs. Typically, they feature an M-shaped folded edge on both sides, though flat-style versions are also available. The material used is either paper-plastic composite fabric or multi-layer kraft paper. For sealing the bottom, a combination of thread stitching along with heat-sealed corrugated paper or jute rope is commonly employed, often reinforced with hot-melt adhesive tape. Alternatively, an additional PE inner liner bag can be added. This type of bag is widely adopted today, allowing direct top-loading and filling during use. It’s an eco-friendly packaging solution, making it ideal for export-oriented businesses. These bags are extensively used across industries such as chemical raw materials, food additives, engineering plastics, and dry powder construction materials.

　　Bottom-seamed gusseted pockets: Ideal for automated packaging equipment. These pockets come in two types—paper-plastic composite and all-paper designs. Typically featuring an M-shaped folded edge, they’re made from either paper-plastic composite fabric or multi-layer kraft paper. The bottom seam is reinforced with a combination of thread stitching and either corrugated paper or jute rope, sealed with heat-applied adhesive tape. During use, materials are automatically fed in through the gusseted opening; once packaged, the valve opening can be securely closed. This is a new, eco-friendly packaging solution, perfectly suited for items like chemical products, feed additives, fine minerals, pigments, resins, and dry-mix building materials such as dry mortar powders.