The kraft paper valve bag is a specially designed packaging solution developed for ultrafine powders, chemical powders, and building material granules. Engineered for fully automatic filling processes, it ensures efficiency and ease of use in industrial applications.

This packaging utilizes multi-layer, high-strength virgin kraft paper composite inner film technology. Combined with a square bottom valve structure, it effectively replaces traditional open-mouth bags, offering improved protection and convenience during use.

Currently serving as the mainstream standardized packaging in various industries including carbon black, white carbon black, titanium dioxide, pigments, additives, and building material powders, its advanced design meets the demanding requirements of these sectors.

• Dust-Leak Prevention: Valve-mouth self-sealing design effectively prevents dust leakage. Equipped with internal or external valve mouths precisely compatible with fully automatic filling machines. Valves automatically close under air pressure after filling, eliminating manual sealing requirements.
• Stable Stacking: Three-dimensional square bottom design ensures bags stand upright and stable without collapsing. Integrated block-shaped base keeps bag body firm and upright, allowing neat multi-layer pallet stacking with even weight distribution.
• Durable Construction: Multiple thick layers provide excellent resistance to impact and tearing. Made from 2 to 4 layers of all-wood pulp stretch kraft paper with strong tensile strength and high toughness.
• Moisture Protection: Food-grade PE moisture-proof liner isolates air, water vapor, and humidity. Prevents ultra-fine powders from absorbing moisture, agglomerating, caking, color fading, and performance degradation.
• Automation Ready: Designed for high-speed automated production with uniform shape, hardness, and precisely fitted valve mouths. Compatible with various domestic and international automatic powder filling machines.
• Brand Enhancement: Supports high-definition flexographic and full-area printing. Can display company logos, product models, net weight, standards, storage and transportation marks, and English export labels.

• Chemical Powder Industry: Compatible with various carbon black types, fumed silica, titanium dioxide, zinc oxide, nano powders, chemical fillers, and additive powders. Meets national general packaging standards for new materials and carbon black enterprises.
• Pigment and Coating Industry: Specifically designed for iron oxide pigments, organic pigments, pearlescent powders, wax powders, matting powders, and color masterbatches. Ensures moisture protection and color lock for domestic and international shipping.
• Building Material Dry Powder Industry: Suitable for tile adhesives, putty powder, dry mortar, gypsum powder, heavy calcium carbonate, talc powder, and insulation powders. Offers stable stacking and strong load-bearing capabilities.
• Rubber and Plastic Industry: Accommodates rubber reinforcement powders, plastic fillers, and modified powders with anti-static and dust-proof features. Designed for automated feeding production lines in rubber mixing workshops.

• Size Customization: Standard stock sizes include 10kg, 20kg, and 25kg bags. Custom sizes available from 5kg to 50kg with special bag styles to fit various filling equipment.
• Material and Process Customization:
  • Standard Version: Multi-layer kraft paper with PE moisture-proof inner film for general powder materials
  • Explosion-Proof Version: Multi-layer kraft paper with anti-static inner film for carbon black and nano powders
• Printing Customization: High-definition flexographic printing supports 1 to 4 colors. Customizable elements include company logos, product information, handling marks, QR codes, and contact details.
• Detail Customization: Extended valve openings, reinforced bag bottoms, overall waterproof lamination, anti-slip surfaces, special breathable designs, and customized hardness/weight adjustments available.