High Tensile Strength Moisture-Resistant Kraft Paper Valve Bags with Customizabl

Typically 80 to 100 grams per bag, these durable packaging bags are designed for industrial powder and granular material packaging.

Kraft paper valve bags represent the leading high-end packaging solution for automated packaging of industrial powders and granular materials. Manufactured from multi-layered, high-strength imported or domestic all-wood pulp kraft paper through composite forming, these bags feature a specialized one-way valve design and are available in two main series: standard paper and paper-film composite for moisture resistance.

The manufacturing process utilizes precision composite bonding, edge-lock stitching, and integrated glued bottom technology, ensuring square, sturdy shapes with stable structures perfectly suited for fully automated high-speed filling production lines. After filling, bags automatically form into cubic shapes, enabling tidy stacking and reducing collapse risks.

These bags offer multiple advantages including high strength and damage resistance, dust and leak prevention, moisture protection, freshness preservation, environmental friendliness, and biodegradability. They meet packaging standards for hazardous powder materials transportation and are compatible with both domestic and international export requirements.

• High Strength Load Bearing, Explosion-Resistant and Durable Constructed with 2-4 layers of thickened high-strength kraft paper composite structure featuring dense paper fibers with excellent tensile toughness. Stitching strength and burst resistance exceed ordinary paper bag standards. Capable of holding 25-50kg materials while withstanding high-speed filling impacts, long-distance transportation friction, and multilayer stacking pressure.
• One-way Valve Opening for Dust-free Filling Proprietary valve with backflow prevention design allows smooth air intake during automated filling. Valve automatically closes and locks air after filling, eliminating manual sealing requirements. Ensures no dust spills throughout the process, maintaining high workshop cleanliness.
• Moisture-proof Sealing to Preserve Material Quality Customizable PE coating film effectively blocks air, moisture, and dust intrusion. Prevents materials like cement, putty powder, and chemical powders from moisture absorption, caking, deterioration, or failure. Ideal for humid storage environments and outdoor transit conditions.
• Stable Stacking and Space-saving Maintains neat, square shape after filling with uniform force distribution and high flatness. Supports tidy multi-layer stacking without deformation or collapsing, improving storage utilization and reducing costs.
• Compatible with Automation, Doubling Efficiency Flat, dimensionally accurate bag mouth with standard valve alignment compatible with all full-automatic and semi-automatic powder filling equipment. Ensures smooth filling without jamming or material leakage.
• Exquisite Printing for Brand Empowerment Supports 4-color high-definition flexographic printing with clear, firmly affixed patterns that do not fade. Can be printed with corporate logos, product specifications, execution standards, UN markings, and traceability information.

Main body made from high-quality pure wood pulp and strong kraft paper with uniform weight, free from impurities, grease, and brittleness. Laminated versions use high-adhesion, weather-resistant PE waterproof film with firm composite bonding. Industrial, eco-friendly, weatherproof glue withstands high temperatures and humidity without losing adhesion.

• Standard layers: 2, 3, and 4 layers with PE lamination for moisture-proof composite structures
• Valve types: inner valve, outer valve, and widened reinforced valves for different filling equipment
• Dimensional tolerance: ±5mm for length, width, and valve size with flat bag body without distortion

Bag surface must be clean, intact, without holes or significant wrinkles. Printed graphics and text should be clear and complete with uniform colors. Seams, valves, and reinforced bottoms need to be flat and sturdy with no glue separation, loose threads, or cracks. Each batch undergoes thorough inspection to ensure minimal defect rates.

Suitable net weights: 10kg, 20kg, 25kg, 40kg, and 50kg. Custom load capacities and sizes available based on material density, filling equipment, and stacking requirements.

• Building Materials Industry: Packaging for ordinary cement, white cement, quick-setting cement, dry powder mortar, tile adhesive, putty powder, joint filler, thermal insulation mortar, gypsum powder, talcum powder, and other dry powder building materials
• Chemical Powder Industry: Packaging services for industrial fillers, pigment powders, chemical dry powders, bentonite, fly ash, mineral powder, lime powder, and flame retardant powders
• Mining and Metallurgical Sectors: Sealed packaging solutions for mineral powders, quartz powder, metal powders, refractory powders, and abrasive powders
• Agriculture and Food Additives: Packaging for powdered fertilizers, soil conditioners, feed powders, starch, and industrial auxiliary powders

Fully customizable sizes with any length and width dimensions. Available in 2 to 4 layers with load capacities from 10 to 50 kilograms. Non-standard sizes and special proportions produced according to specific requirements.

Options include single or double-sided PE lamination, reinforced and thickened materials, widened valve openings, strengthened bottoms, breathable pressure relief features, and leak-proof sealing. Adaptations designed for humid environments, long-distance transportation, and frequent handling conditions.

High-definition printing services in single color or four colors. Custom prints include corporate logos, brand information, product specifications, compliance standards, UN markings, batch tracking codes, contact details, and promotional content.

Choose from standard kraft paper, reinforced high-strength kraft paper, and waterproof composite paper to match different budgets and specific usage scenarios.