This kraft paper valve bag is manufactured from pure wood pulp virgin kraft paper through a precise bag-making process, creating a high-performance packaging container specifically designed for granular, powdery, and flake materials. The environmentally friendly and highly durable design features an innovative valve that provides excellent sealing properties and user convenience.
During filling operations, specialized equipment can quickly complete the loading process without manual opening of the bag mouth, significantly improving packaging efficiency. The valve design effectively prevents material leakage, making it ideal for industrial-scale batch packaging requirements.
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| Parameter | Specification |
|---|---|
| Material Requirements | Base material: 100% pure wood pulp kraft paper (120-250 g/m²) Moisture-proof variant: Food-grade PE lamination Valve components: High-strength kraft paper or composite paper Adhesive: Eco-friendly water-based glue |
| Production Process | Fully automatic valve bag manufacturing Smooth surface without burrs or wrinkles Uniform stitching with no skipped stitches Flexographic printing (1-6 colors) Square or round bottom technology |
| Quality Standards | Surface free from damage, holes, stains, and wrinkles Dimensional tolerance: ±5mm (length, width, height) Valve inner diameter tolerance: ±1mm Sealing performance: No leakage after 24-hour inversion test |
| Storage Requirements | Temperature: 15°C to 30°C Relative humidity: ≤60% Maximum stacking height: 1.2 meters Shelf life: 2 years (unopened) |