Square Bottom Multiwall Kraft Paper Bags with Custom Sizes and Eco Friendly Packaging for Bulk Industrial Use
The multi-layer kraft paper valve bag is manufactured from multiple layers of high-quality fully wood pulp stretch kraft paper. Featuring an integrated valve filling structure, this packaging solution ensures excellent formation, superior bearing capacity, and exceptional resistance to dropping and tearing.
This environmentally friendly packaging features a green overall design, is free from unpleasant odors, and is fully biodegradable. An optional laminated moisture-proof process is available to provide additional protection for your contents.
Ideal for automated filling, storage, and transportation of powder, granules, and powdered materials, these valve bags serve as an excellent replacement for traditional woven bags. They offer a clean, attractive appearance, stable stacking performance, and effectively prevent bag breakage and powder leakage.
Multi-layer kraft paper composite provides strong tensile strength and high toughness, effectively resisting tearing and impact. Ensures bags do not break, burst at the bottom, or leak during filling, handling, and stacking.
Built-in conical valve design compatible with fully automatic filling equipment. Automatically compresses and seals after filling without stitching or tying, saving time while providing excellent sealing performance.
Customizable inner PE coating or moisture-proof layer effectively blocks moisture and dust, preventing caking of hygroscopic powder materials. Suitable for long-term storage of moisture-sensitive powders.
Square bottom and three-dimensional shaping ensure the bag body stands firm and flat. Allows for neat, stable stacking in warehouses, saving storage space and preventing deformation during loading and transportation.
Made from food-grade eco-friendly kraft paper free from fluorescent agents or heavy metals. Biodegradable and complies with environmental discharge and waste classification standards.
Supports multi-color flexographic and offset printing for custom company logos, product names, specifications, warnings, and contact information. Clear, attractive layout enhances brand image effectively.
Lightweight yet strong construction ensures durability for storage and transportation with multiple reuse capability. More environmentally friendly and upscale compared to plastic woven bags.
| Parameter | Specifications |
|---|---|
| Material | 100% pure wood pulp stretch kraft paper in 2-layer, 3-layer, or 4-layer configurations with optional inner PE lamination |
| Structure | Inner valve and outer valve options with multi-layer composite bonding, hot melt reinforcement, and bottom strengthening |
| Dimensions & Capacity | Custom length, width, and height with standard capacities of 20kg, 25kg, 40kg, and 50kg |
| Physical Performance | High tensile strength longitudinally and transversely, excellent burst resistance, withstands filling pressure without rupturing |
| Printing | 1 to 4 color custom printing with logos, texts, barcodes, icons, and bilingual instructions |
| Compliance | Meets national standards for industrial packaging paper and environmentally friendly packaging |
- Building Materials & Chemical Industry: Cement, putty powder, gypsum powder, talcum powder, calcium carbonate, fly ash, lime powder, mortar additives
- Agricultural & Livestock Industry: Compound fertilizers, organic fertilizers, chemical fertilizers, feed pellets, grains, soybean meal, bran
- Food Raw Materials Industry: Flour, starch, granulated sugar, maltodextrin, food additives, baking ingredients
- Industrial Raw Materials: Chemical powders, rubber and plastic pellets, carbon black, white carbon black, pigments, resin powders, metal powders
- Other Applications: Mining powders, refractory materials, insulation materials, construction auxiliaries, bulk materials for import/export
- Number of Layers: 2-layer, 3-layer, or 4-layer solutions
- Paper Weight: 70 to 120 grams per square meter
- Moisture Protection: Standard non-laminated or inner PE lamination
- Size & Capacity: Custom length, width, and height from 20kg to 50kg
- Printing & Design: Personalized logos, branding, specifications, warnings
- Bag Styles: Internal valve, external valve, reinforced bottom, side reinforcements
- Requirement Discussion: Confirm usage, weight, dimensions, layers, moisture resistance, printing content, and order quantity
- Design Layout: Free design service with confirmation of printing proofs
- Sample Confirmation: Physical sample bags provided for verification of size, material, and print quality
- Mass Production: Formal production with strict quality control measures
- Quality Inspection & Delivery: Complete factory inspection, timely dispatch with logistics support
As a factory-direct supplier, we support large-scale custom orders with reasonable minimum quantities. Benefit from free layout design and sample delivery. Our products are environmentally compliant, robust, and stable—ideal for long-term private labeling, brand customization, and export orders.
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Have questions about our products or want to discuss a custom order? Our team is ready to help you.