As industries including dairy products, food additives and chemical raw materials continuously raise hygiene and efficiency requirements for powder packaging, large-size powder packaging is accelerating the transition to full automation. As core equipment for large-bag powder packaging, the fully automatic 25kg milk powder packaging machine has become the preferred option for packaging upgrading among numerous manufacturers thanks to its highly integrated automation capacity and stable operation performance.
As an original powerful manufacturer with 27 years of experience in packaging machinery, Guangzhou Marchi Packaging Equipment Co., Ltd. and Hefei Marchi Packaging Equipment adopt a dual-base collaborative model, focusing on the R&D of fully automatic powder packaging equipment and the delivery of full-line solutions. Marchi has served more than 5,000 customers, with equipment exported to over 50 countries covering food, pharmaceutical, daily chemical and other sectors, and provides long-term packaging support for well-known enterprises such as Yili, Xiuzheng Pharmaceutical and Liby.
I. Core Model Selection: MCZD-25F Fully Automatic Powder Packaging Machine
Targeting the demand for 25kg large-bag milk powder packaging, Marchi launches the MCZD-25F fully automatic powder packaging machine. This machine integrates bag storage, bag picking, bag opening, metering and filling, sealing and rear-end conveying functions to realize full-process automatic operation. The equipment consists of a bag storage bin, bag picking and sorting device, bag loading manipulator, bag clamping and discharging device, bag pushing device, bag mouth guiding device, vacuum system and control system. It is compatible with laminated kraft paper bags, woven bags, plastic bags and other materials, with applicable bag lengths ranging from 500 to 1000 millimeters.
II. Core Configuration and Key Parameters
- Feeding and Metering: Vertical single-screw feeding directly driven by a servo motor to guarantee metering speed and precision. Weighing sensors and controllers feed back weight signals in real time to realize precise control.
- Bag Loading and Clamping: Automatically pick bags from the bag storage bin, complete centering positioning, pre-opening of bag mouths, insertion of cutters, and clamping by pneumatic grippers on both sides without manual intervention in the whole process.
- Vacuum Nitrogen Flushing Function: Integrated vacuum pumping and nitrogen flushing system. Air inside the bag is evacuated first, followed by injection of high-purity nitrogen to effectively reduce residual oxygen content and preserve the freshness of milk powder.
Key Parameters (MCZD-25F)
- Packaging Weight: 5～25 kilograms
- Packaging Accuracy: ≤±0.1%～0.2%
- Packaging Speed: 1.5～2 bags per minute
- Applicable Bag Length: 500～1000 millimeters
- Applicable Bag Materials: laminated kraft paper bags, woven bags, plastic bags, etc.
III. Overview of Equipment Advantages
- Fully Automatic Operation: Integrated automatic metering, bag loading, filling, heat sealing and stitching, saving manpower and lowering long-term costs.
- High-precision Metering: Servo-driven screw with stable precision of ±0.1%～0.2% to ensure accurate weight of each bag.
- Vacuum Nitrogen Flushing for Freshness Locking: Measured residual oxygen content can be controlled below 0.3%, effectively inhibiting oxidation and extending shelf life.
- Wide Adaptability: Supports multiple bag types and materials to flexibly meet diverse packaging requirements.
- Full-line Coordination Capacity: Can be seamlessly connected with upstream and downstream equipment to form a complete assembly line operation.
IV. Wide Application Scenarios
The equipment is applicable not only to dairy products such as whole milk powder, skim milk powder, infant formula milk powder, goat milk powder and soybean milk powder, but also to a wide range of materials including non-dairy creamer, protein powder, maltodextrin, whey powder, soybean protein powder, collagen powder, glucose powder, white granulated sugar powder, corn starch, xanthan gum, guar gum, vanillin, cocoa powder, matcha powder, coconut milk powder, vitamin premixes, malt powder, oat powder, black bean powder, premixes, flour, coffee powder, seasoning powder, enzyme preparations, feed powder, dyestuffs, pesticide powders, veterinary drug powders, solid pharmaceuticals and various powdery additives.
V. Complete Packaging Process (Including Automatic Palletizing)
Taking Marchi’s fully automatic 25kg milk powder packaging line as an example, the complete process is as follows:
- Bag Storage and Sorting: Empty bags are stored in the bag storage bin. The bag picking and sorting device takes out empty bags and completes centering positioning. Vacuum suction cups convey bags to grippers, while printing information such as production date and batch number.
- Bag Loading: The cutter of the manipulator inserts into the bag mouth, pneumatic grippers on both sides clamp the bag mouth, and the empty bag is sleeved onto the bag clamping discharging port.
- Automatic Metering and Filling: The screw rotates to feed materials according to the set weight. Milk powder enters the weighing system for high-precision filling, and vacuum pumping or nitrogen flushing can be carried out simultaneously during filling.
- Cleaning and Nitrogen Flushing: Residual powder on the bag mouth is cleaned after discharging. Pre-vacuum pumping is then performed, followed by dynamic supplementation of high-purity nitrogen to ensure residual oxygen content meets standards.
- Heat Sealing and Stitching: The bag mouth is heated, pressed and sewn to complete sealing and prevent air leakage or moisture ingress.
- Conveying and Inspection: Finished bags are transported via belt conveyor and sequentially go through bag inverting, inkjet coding, metal detection and dynamic checkweigher.
- Fully Automatic Palletizing: Qualified finished bags are neatly stacked automatically by the palletizing system, realizing full-process automatic operation from packaging to palletizing.
VI. Customer Pain Points and Solutions
Pain Point 1: High risk of oxidative deterioration of milk powder. Traditional packaging cannot effectively isolate oxygen, leading to nutrient loss and flavor change of milk powder.Solution: Marchi fully automatic nitrogen flushing packaging machine adopts a three-stage oxygen displacement system. Air inside the bag is evacuated first before injecting high-purity nitrogen. The measured residual oxygen content is ≤0.3%, equipped with online monitoring of nitrogen purity (≥99.5%) to ensure each bag maintains an ideal fresh-keeping state.
Pain Point 2: High labor cost and low efficiency. Manual bag loading, weighing and sealing are time-consuming with continuously rising labor costs.Solution: This equipment realizes full-process automation without manual intervention. A single machine can complete all procedures and can be connected to the full line, greatly boosting output per capita.
Pain Point 3: Unstable weighing accuracy. Manual operation is susceptible to fatigue and human errors.Solution: Servo motor cooperates with real-time feedback from weighing sensors, with stable precision of ±0.1%～0.2% to guarantee consistent weight of every bag.
Pain Point 4: Limited packaging speed resulting in insufficient production capacity.Solution: The stable operating speed of MCZD-25F reaches 1.5～2 bags per minute, meeting the demands of large-scale continuous production and helping enterprises unlock production potential.
Pain Point 5: Strict hygiene standard requirements.Solution: The equipment structural design complies with food hygiene specifications, and key parts are easy to clean and maintain, supporting continuous, stable and hygienic production for enterprises.
Drawing on 27 years of industry accumulation, Marchi Packaging Equipment provides customized solutions ranging from single machines to full production lines as well as whole factory design services. Customers are welcome to contact us for consultation or visit our factory for inspection, and jointly develop efficient packaging solutions suitable for your production requirements.
