Colored Multiwall Bags with Enhanced Performance
Typically 70-120 GSM thickness colored multiwall bags featuring enhanced tear resistance through multi-layer construction and moisture-resistant polyethylene lining.
Product Overview
Our colored multi-layer kraft paper valve bags are manufactured from high-strength colored kraft paper with a 2 to 4-layer laminated structure that significantly enhances durability and strength. These eco-friendly industrial packaging bags utilize patented valve technology for efficient, secure sealing and are specifically engineered for dust-free filling and transportation of powdery and granular materials weighing 25 to 50 kilograms.
Key Features
- Multi-layer Durable Structure: Constructed from 80-120 GSM colored kraft paper with 2-4 layer lamination using water-based environmentally friendly adhesive. Tensile strength ≥4.5 kN/m (machine direction) and ≥3.5 kN/m (cross direction) with bursting strength ≥1400 kPa. Withstands 2-meter drops without damage.
- Customizable Color Printing: Supports spot color and four-color offset printing with vivid colors, strong adhesion, and excellent abrasion resistance. High-definition full-color printing enhances brand recognition and product differentiation.
- Valve Seal Design: Internal or external valves with ultrasonic heat sealing technology automatically close during filling to prevent powder leakage and dust dispersion. Valve dimensions precise within ±5mm for fast filling speeds and excellent sealing performance.
- Moisture and Dust Barrier: Optional PE liner provides moisture-proof and leak-resistant features, effectively blocking water vapor and dust to extend material shelf life. All-paper structure is odorless and pollution-free.
- Eco-friendly and Biodegradable: Made from renewable plant fibers, fully recyclable and naturally biodegradable. Meets plastic ban regulations and green supply chain requirements while reducing environmental costs.
- Space-saving Stackability: Square bottom three-dimensional structure ensures neat stacking and strong stability, preventing sliding and collapse. Improves warehouse space utilization and reduces logistics costs.
Technical Specifications
Material Requirements
Kraft paper made entirely from virgin wood pulp with high extensibility. Paper weight: 70-120 GSM. Material must be free from damage, unpleasant odors, or impurities.
Dimensional Tolerances
| Parameter |
Tolerance |
| Finished Product Length |
±5mm |
| Finished Product Width |
±5mm |
| Folding Edge Width |
±5mm |
| Valve Mouth Width & Length |
±5mm |
Printing and Appearance Standards
Text and patterns must be clear with consistent colors, no shadows or missing prints. Strong printed layer adhesion. Bag surface must be smooth, free from wrinkles, damage, or stains. Valve mouth properly aligned and securely sealed with no glue peeling or leakage.
Industry Applications
Chemical Industry
Carbon black, white carbon black, plastic masterbatch, pigments, dyes, additives, chemical fertilizers, and compound fertilizers. Requirements: moisture resistance, anti-static properties, corrosion resistance, dust-free filling, and high load-bearing capacity.
Building Materials Industry
Cement, dry powder mortar, gypsum powder, putty powder, lime powder, and insulation materials. Requirements: high load-bearing ability, drop resistance, powder leak prevention, stackability, and moisture protection.
Food and Feed Industry
Flour, starch, sugar, salt, feed, grains, and food additives including vitamins and amino acids. Requirements: high cleanliness, light avoidance, moisture resistance, and odor-free packaging.
Minerals and Energy Industry
Mineral powder, coal powder, metal powder, activated carbon, and graphite powder. Requirements: dust prevention, moisture resistance, high strength, and leak-proof performance.
Other Industries
Pharmaceutical intermediates, daily chemical powders, refractory materials, and other chemical raw materials in 25 to 50 kg granular or powder forms.
Customization Services
HUAYUAN offers customizable Colored Multiwall Bags (Model: 250000) with weight capacity from 5 Kg to 50 Kg and thickness typically 70-120 GSM. Perfect for packaging grains, flour, seeds, animal feed, and serving as reusable kraft paper gift bags.
Specification Customization
- Dimensions: Length: 500-900 mm, Width: 300-600 mm, Fold edges: 50-150 mm (non-standard sizes available)
- Load Capacity: 25 kg, 30 kg, 40 kg, 50 kg (design layers and paper weight tailored as required)
- Layers: 2, 3, or 4 layers (standard: 3 layers - 2 paper layers plus 1 film layer)
Color and Printing Customization
- Colors: Customized spot colors (red, yellow, blue, green, black, white) with Pantone color matching
- Printing: High-definition 1 to 4 color printing for logos, company names, product specifications, QR codes
- Techniques: Offset printing, embossing, intaglio printing, and lamination
Functional Customization
- Reinforcements: Double-layer bottom reinforcement, side stiffening ribs, valve mouth strengthening
- Openings: Inner valves, outer valves, easy-tear openings, air vents to prevent bag bloating
Cooperation Process
- Requirement Communication: Confirm material characteristics, load capacity, dimensions, colors, printing, and functional needs
- Solution Design: Free design drawings and sample confirmation
- Production and Delivery: 20-30 day lead time with logistics services and full tracking
- After-Sales Guarantee: Unconditional returns and exchanges for quality issues with technical support
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