In the storage, transportation and trade links of bulk bulk materials, the accuracy of quantitative packaging directly affects enterprises' cost control and product reputation. As key equipment between fully automatic and manual packaging, the semi-automatic bulk bag quantitative packaging machine requires manual assistance for bag loading and hanging, while core actions such as weighing, filling and bag releasing are automatically completed by the machine. This mode balances automatic efficiency and equipment investment cost, and is especially suitable for production scenarios with small and medium batches, multiple specifications and high flexibility requirements. As an original manufacturer with years of packaging machine manufacturing experience, Marchi Packaging Equipment focuses on the R&D and production of semi-automatic bulk bag quantitative packaging machines, and provides professional bulk bag quantitative packaging solutions for industries such as starch, flour, chemical raw materials, building materials and grain.
I. Core Equipment Composition and Technical Advantages
Marchi MCJBP-2000SS stainless steel bulk bag quantitative packaging machine adopts gross weight weighing and metering mode. The bulk bag is suspended on the weighing platform, and materials directly enter the packaging bag for metering by weighing sensors. The whole machine consists of six core modules: feeding device, weighing platform, lifting mechanism, bag hanging-releasing / bag clamping device, air inflation / return air dust removal pipeline and steel frame structure.
The feeding device adopts a double-screw feeding structure to feed materials by self-weight. Variable frequency speed regulation realizes independent setting and control of coarse and fine feeding flow. A cut-off butterfly valve is installed at the outlet of the single arc feeding gate to effectively prevent residual materials from falling and affecting packaging accuracy. The professionally designed pneumatic shifting fork mechanism can effectively prevent powder from arching and bridging in the feeding area, ensuring continuous and stable feeding.
The weighing platform is equipped with high-precision and impact-resistant weighing sensors, matched with special force transmission connecting mechanisms, with multiple protection functions such as overload and limit. The system has functions of automatic tare removal, automatic zero calibration and automatic drop compensation to ensure accurate transmission of bag weight. The lifting mechanism is fixed on the weighing platform, which can lift and lower the bags according to actual conditions during filling to guarantee filling effect; after weighing, the heavy bags are lowered to the ground or pallets for automatic bag mouth release and automatic sling unhooking. The bag hanging-releasing / bag clamping device can adapt to packaging bags with nominal volume ranging from 1200 to 1400L, and has functions of manual sling hanging, pneumatic bag mouth clamping, automatic bag mouth loosening and unhooking. The equipment adopts stainless steel structure, and all parts in contact with materials are made of 316L material.
Key Parameters
Model MCJBP-2000SS, packaging accuracy ±0.1%～±0.3%, packaging speed 5-6 bags per hour (subject to weighing weight and material characteristics), single bag packaging weight 400-600KG, power 2.45KW, power supply AC380V 50Hz.
II. Applicable Materials and Equipment Selection
The selection of semi-automatic bulk bag quantitative packaging machine needs comprehensive consideration based on material characteristics, packaging specifications and production capacity requirements. MCJBP-2000SS is widely applicable to quantitative packaging of various powder and granular materials: starch categories including corn starch, wheat starch, cassava starch; plastic raw materials such as PVC, PE, PP, PET; fine chemicals including titanium dioxide, carbon black, graphite, pigments, dyes, lithium carbonate, lithium chloride, white carbon black; building materials including gypsum powder, dry-mixed mortar, cement; food fields including flour, food additives, crystalline sugar, chemical fertilizers, feed, etc. The equipment can realize stable packaging by adjusting parameters for powders with good fluidity or easy bridging, meeting production demands of multi-variety switching.
III. Complete Packaging Process of Semi-automatic Bulk Bag Quantitative Packaging Machine
The semi-automatic bulk bag quantitative packaging process covers complete procedures from empty bag loading to heavy bag output: Manual bag hanging and clamping. Operators hang the slings of empty bulk bags on the hooks of the bag hanging-releasing device, sleeve the bag mouths into the bag clamping device, and the pneumatic mechanism automatically clamps the bag mouths to ensure tight docking between bag mouths and the outlet of the feeding device. After pressing the start button, the system automatically detects voltage, air pressure, dust removal and weight data, and starts the packaging procedure after confirming normal status.
Quantitative filling and weighing. The feeding device starts, and the double-screw structure conveys materials into the bulk bag. The weighing platform monitors the material weight inside the bag in real time. The system adopts two-stage feeding control of fast filling and slow precise filling; it switches to slow feeding when materials reach 95% of the rated value, and stops feeding when reaching the set target value. During filling, the lifting mechanism can lift and lower timely according to material accumulation state to make materials evenly distributed inside the bag and improve filling density.
Weighing completion and bag releasing. Feeding stops after reaching the set weight, and the cut-off butterfly valve closes. The lifting mechanism lowers the heavy bag to the ground or pallet, and the bag changes from suspended state to bottom supporting state. The bag hanging-releasing device automatically loosens the bag mouth and unhooks the sling to complete a single packaging cycle.
Conveying and palletizing. Finished bulk bags are transported to the palletizing area by forklifts or conveying equipment, arranged and stacked regularly for convenient warehouse management and logistics transportation. The air inflation / return air dust removal pipeline works continuously throughout the whole process to effectively collect dust-containing gas generated during filling and keep the working environment clean.
IV. Core Customer Pain Points and Solutions
Pain Point 1: Unstable quantitative accuracy leading to material waste and trade disputesTraditional manual or simple equipment has large weighing errors, and out-of-tolerance bags need rework or scrapping, affecting the consistency of product batches.Solution: MCJBP-2000SS is equipped with high-precision weighing sensors and double-screw variable frequency feeding technology to realize two-stage coarse and fine feeding control, with packaging accuracy of ±0.1%～±0.3%. The system has functions of automatic tare removal, automatic zero calibration and automatic drop compensation to ensure accurate and reliable weight of each bag of materials.
Pain Point 2: Powdery materials are prone to bridging and dusting, affecting packaging continuity and production environmentPowders such as starch and carbon black are easy to arch and bridge in silos during feeding, resulting in feeding interruption; dust flies during powder filling and pollutes the workshop environment.Solution: The feeding device is equipped with a pneumatic shifting fork mechanism to effectively prevent material bridging and guarantee feeding continuity. The combination of air inflation / return air dust removal pipeline and closed operation system greatly reduces dust overflow and improves the working environment.
Pain Point 3: Many manual operation links lead to high labor intensity and limited operation efficiencyTraditional bulk bag packaging requires manual completion of multiple links such as bag hanging, bag clamping and bag releasing.Solution: While retaining the flexibility of manual bag loading, the semi-automatic bulk bag quantitative packaging machine realizes automation of core procedures including bag clamping, weighing, filling and bag releasing. The lifting mechanism automatically completes bag lifting and lowering, and the bag hanging-releasing device automatically completes sling unhooking, greatly reducing manual intervention and operation intensity.
Pain Point 4: Insufficient equipment adaptability failing to meet packaging demands of multi-variety materialsMaterials differ greatly in fluidity and bulk density, and a single piece of equipment cannot be universally applied.Solution: MCJBP-2000SS adopts modular design. The feeding device can flexibly adjust feeding flow through variable frequency speed regulation, the weighing system supports parameter setting of different weight specifications, and the bag hanging-releasing device can adapt to packaging bags with volume of 1200～1400L. The equipment can be adjusted pertinently according to different material characteristics to meet flexible production demands of multiple varieties.
Pain Point 5: Complicated equipment maintenance and long downtime affecting production continuityComponents wear under long-term dust environment, and inconvenient maintenance delays production schedule.Solution: The equipment adopts stainless steel structure with corrosion resistance, wear resistance and few vulnerable parts. Modular design facilitates disassembly and installation of all components, improves efficiency of daily maintenance and fault troubleshooting, and effectively shortens downtime.
As a professional bulk bag packaging machine manufacturer, Marchi Packaging Equipment always takes customer demands as the orientation, and provides semi-automatic bulk bag quantitative packaging machines with high precision, high reliability and high adaptability for industries such as starch, chemical industry, building materials and grain. Marchi provides full-process technical support and service guarantee covering scheme design, equipment selection, installation and commissioning, operation training and after-sales maintenance, helping customers realize quality improvement and efficiency increase in packaging links.
