Customized Printing Moisture-Resistant Square Bottom Self-Standing Multiwall Paper Bags and Sewn Multiwall Bags

Open-top kraft paper bags, also known as open-mouth kraft paper bags, are widely used industrial packaging products designed for bulk materials. These bags are made from multiple layers of high-strength virgin kraft paper, ensuring durability and reliability in various industrial applications.

Typically, the structure features a fully open top for easy filling, while the bottom is either stitched or glued to form a secure base. This design does not include a valve, making it suitable for straightforward packing and handling processes.

• Open Full-Mouth Design: Convenient and efficient loading with large feeding aperture that prevents material blockages. Compatible with manual, semi-automatic, and shovel feeding methods.
• Multi-Layer Thickened Material: Constructed with 1 to 4 layers of virgin wood pulp kraft paper (80-100g/m²) for high strength and durability, capable of bearing 25-50kg loads.
• Optional Moisture-Proof Inner Liner: Full PE moisture-proof inner liner or water-resistant coating available to protect against dust, moisture, and clumping.
• Square Bottom Self-Standing Shape: Flat and sturdy base for neat stacking, reducing tipping risk and maximizing storage efficiency.
• Environmentally Friendly: Fully recyclable and biodegradable wood pulp kraft paper, compliant with environmental regulations.
• Clear and Attractive Printing: Multi-color high-definition printing for company logos, product information, and branding elements.

• Raw Material: 100% virgin wood pulp kraft paper (80-100 g/m² basis weight), 1-4 layer construction
• Dimensional Tolerance: ±5 mm for all dimensions
• Load Capacity: 25-50 kg
• Burst Strength: ≥ 400 kPa (three-ply or higher structures)
• Drop Test: Withstands 1.5 meter vertical drop when fully loaded
• Water Absorption: ≤30 g/m² (30-minute test)
• Safety Compliance: Food-grade and industrial-grade options available with compliance testing documentation

• Building Materials: Dry mortar, putty powder, gypsum powder, lime powder, waterproof powders, thermal insulation mortar
• Chemical Industry: Carbon black, pigments, dyes, plastic masterbatches, fertilizers, inorganic salts
• Food and Feed: Flour, starch, corn flour, edible sugar powder, grain granules, feed powder
• Minerals and Refractory Materials: Mineral powder, graphite powder, metal powders, activated carbon, refractory powders
• Rubber, Plastics & New Materials: Plastic pellets, rubber additives, color masterbatches, modified materials

• Size and Specification: 1-4 layer structures, 5kg to 50kg load capacities, custom dimensions
• Material and Structure: Natural yellow kraft paper, refined white kraft paper, PE inner moisture-proof linings
• Printing and Appearance: 1-4 color high-definition printing for logos, product information, QR codes
• Functional Enhancements: Moisture-proof liners, vent holes, reinforced bottoms for special requirements
• Collaboration Process: Requirement consultation, specification matching, sample confirmation, mass production with quality inspection