Customized Logo Moisture-Proof Square Bottom Self-Standing Multiwall Paper Bags for Industrial Packaging

Open kraft paper bags, also known as open-mouth kraft paper bags, are widely used packaging products designed for industrial bulk materials. These bags are manufactured using multiple layers of high-strength virgin kraft paper, ensuring durability and reliability during transportation and storage.

The typical design features a fully open top for easy filling, with the bottom constructed either by stitched seams or glued formations for secure closure. These bags do not include valve openings, making them suitable for various types of dry bulk goods.

• Fully Open Mouth Design: Unobstructed opening allows efficient filling via manual, semi-automatic, or shovel loading methods with easy sealing options
• Multi-layer Thickened Material: 1-4 layers of virgin wood pulp kraft paper (80-100g/m²) bonded with eco-friendly water-based glue for exceptional strength
• Optional Moisture-Proof Inner Liner: PE moisture barrier or waterproof coating prevents clumping and extends storage life in humid environments
• Square Bottom Self-Standing Shape: Flat, firm base ensures stable stacking and optimal space utilization for pallet and container loading
• Environmentally Friendly: Fully recyclable and biodegradable kraft paper alternative to plastic woven bags
• High-Quality Printing: Multi-color offset and flexographic printing for brand logos, product information, and QR codes

• Material: Virgin wood pulp stretch kraft paper (80-100g/m² basis weight), 1-4 layers
• Adhesive: Environmentally friendly water-based glue, non-toxic and odorless
• Dimensional Tolerance: ±5mm for all measurements
• Bursting Strength: ≥400 kPa for 3+ layer structures
• Load Capacity: 25-50 kg safe carrying capacity
• Drop Test: Withstands 1.5 meter vertical drop without cracking
• Moisture Resistance: ≤30g/m² water absorption over 30 minutes
• Appearance: Flat, uniform lamination without wrinkles, stains, or deformation

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

• Size & Structure: 1-4 layer configurations, weights from 5-50kg, custom dimensions and shapes
• Materials: Natural kraft paper, refined white kraft paper, PE inner moisture barrier films
• Printing: 1-4 color high-definition printing for logos, product information, QR codes
• Functional Enhancements: Moisture-proof films, ventilation holes, reinforced bag bottoms
• Full Service: Demand coordination, specification matching, sample production, quality control