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Kraft Paper Square Bottom Valve Bag Making Machine A specialized automated production device engineered to manufacture square-bottom valve bags using kraft paper—renowned for its high tensile strength and eco-friendliness—for packaging granular, powdery, or bulk materials (e.g., cement, flour, animal feed). It integrates multi-step processing (from paper unwinding to bag forming) into a single line, ensuring consistent bag structure, tight sealing, and compatibility with industrial filling systems. Core Features & Technical Advantages Square Bottom Forming Precision: Adopts a servo-driven folding system that creates flat, symmetrical square bottoms with a sealing strength of ≥50N. This design enhances bag stability during stacking and prevents material leakage during transportation. Valve Structure Integration: Automatically attaches and seals the valve (usually made of kraft paper or PE-lined kraft paper) at the bag’s top. The valve’s smooth inner surface enables fast, dust-free filling via industrial filling nozzles, reducing material waste. Kraft Paper Adaptability: Handles kraft paper with a basis weight of 80-200 g/m², including single-layer, multi-layer, or PE-coated kraft paper. Its adjustable paper tension control prevents paper tearing or wrinkling during processing. High Efficiency & Automation: Operates at a production speed of 30-80 bags per minute (adjustable based on bag size) and features PLC touchscreen control. It supports automatic error detection (e.g., paper breakage, incomplete sealing) with real-time alerts to minimize downtime. Application Scenarios & Customization Industrial Packaging Plants: Produces large-volume kraft paper valve bags for construction (cement, sand), agriculture (fertilizer, seeds), and food processing (flour, sugar) industries, meeting heavy-duty packaging requirements. Eco-Conscious Brands: Ideal for manufacturing recyclable, plastic-free kraft paper bags, aligning with global sustainability trends (e.g., FSC-certified kraft paper compatibility for eco-labeled packaging). Customizable Bag Specifications: Supports bag size adjustments (width: 150-400mm, height: 300-800mm) and optional add-ons, such as printing modules (for logos/barcodes), PE inner lining (for moisture resistance), or tear notches (for easy opening).