In the milk powder packaging process, weighing accuracy and fresh-keeping effect directly affect enterprises’ production costs and product shelf life. Products such as whole milk powder and infant formula milk powder are oxygen-sensitive. Metering deviation and oxidation risks during packaging are long-standing challenges for dairy manufacturers. Developed by Marchi Packaging Machinery, the fully automatic nitrogen flushing milk powder packaging machine (Model: MCZD-25F) adopts high-precision screw metering and intelligent nitrogen flushing technology as the core, providing packaging solutions balancing efficiency and quality for dairy and powder processing enterprises.
Core Equipment Advantages
The MCZD-25F adopts vertical single-screw feeding. The screw is directly driven by a servo motor and rotates precisely for feeding according to control signals. Weighing sensors and weighing controllers collaboratively process signals, output weight data in real time and perform feedback regulation, ensuring the packaging accuracy of each bag is stably maintained at ≤±0.1%～0.2%. The equipment integrates dual functions of vacuum pumping and nitrogen displacement. After filling, air inside the bag is extracted first, followed by injection of food-grade nitrogen with purity no less than 99.5%. The inert property of nitrogen isolates oxygen, effectively delaying fat oxidation and microbial growth, and preserving the nutrition and flavor of milk powder.
The equipment realizes fully automatic operation: bags are automatically picked from the bag storage bin, followed by centering positioning, conveying, bag mouth positioning and pre-opening. The cutter of the bag loading manipulator cooperates with pneumatic grippers on both sides to complete bag loading, and then filling, heat sealing and stitching operations are carried out. The whole machine 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. All units operate coordinately and stably, with a packaging speed of 1.5～2 bags per minute. The equipment is constructed from 304 stainless steel for easy cleaning, supports non-standard customization, and comes with a one-year warranty and lifelong maintenance.
Wide Range of Applicable Materials and Application Scenarios
The equipment is applicable not only to whole milk powder, skim milk powder, infant milk powder, adult milk powder, goat milk powder, cow milk powder and soybean milk powder, but also to powdery materials including protein powder, whey powder, non-dairy creamer, maltodextrin, condensed milk powder, cream powder, soybean protein powder, pea protein powder, collagen powder, rice protein powder, glucose powder, white granulated sugar powder, corn starch, resistant maltodextrin, cyclodextrin, carboxymethyl cellulose, xanthan gum, vanillin, cocoa powder, matcha powder, non-dairy cream powder, coconut milk powder, calcium carbonate, vitamin premixes, malt powder, oat powder, black bean powder, almond powder and grain powder. It supports multiple bag types such as laminated kraft paper bags, woven bags and plastic bags with bag lengths ranging from 500 to 1000 millimeters, flexibly adapting to diverse packaging requirements.
Fully Automatic Packaging Process
The complete workflow of the whole production line is as follows: Feeding → Mixing → Lifting → Screw Metering → Automatic Packaging → Sealing and Stitching → Weight Inspection → Metal Detection → Robotic Palletizing → Warehousing. Materials are lifted into the screw feeding system for precise metering driven by a servo motor; the equipment automatically picks, opens and loads bags; vacuum pumping and nitrogen flushing are carried out after filling, followed immediately by heat sealing and stitching; finished products pass weight re-inspection and metal detection to eliminate unqualified items. Finally, fully automatic palletizing robots neatly stack products according to preset programs and send them to the warehouse. The whole process requires no manual intervention. After a well-known dairy enterprise introduced this equipment, production line efficiency increased by nearly 40%, while material waste caused by metering deviation was avoided.
Customer Pain Points and Solutions
Pain Point 1: Inaccurate metering leads to net content deviation and increased material loss.Milk powder contains fine particles with highly variable bulk density, making it difficult for traditional weighing methods to guarantee consistent weight for every bag.Solution: The servo-motor-driven vertical screw cooperates with high-precision weighing sensors to realize closed-loop control with accuracy of ≤±0.1%～0.2%, significantly reducing risks of overfilling and underfilling and saving raw material costs.
Pain Point 2: Oxidative deterioration of milk powder shortens shelf life and damages brand reputation.Milk powder rich in fat is highly susceptible to rancidity in an oxygen-rich environment.Solution: Dual processes of vacuum pumping and nitrogen flushing effectively reduce oxygen content inside bags to below 1%. Nitrogen isolates oxygen to extend shelf life. Appropriate buffer space is retained inside bags after nitrogen flushing to prevent caking caused by extrusion during long-distance transportation.
Pain Point 3: Numerous manual operation links result in high labor costs and difficult hygiene control.Relying on manual work for multiple procedures leads to low efficiency and raises risks of foreign matter contamination.Solution: The whole machine runs fully automatically from bag picking and filling to sealing and palletizing to save manpower. Meanwhile, the 304 stainless steel structure and good sealing performance meet food-grade hygiene requirements and reduce dust overflow.
Pain Point 4: Difficult bag type switching limits production flexibility.Enterprises often need to replace packaging bags of different materials and sizes.Solution: The equipment supports multiple materials including laminated kraft paper bags, woven bags and plastic bags with adjustable bag lengths from 500 to 1000 millimeters. Non-standard customization is available to flexibly meet multi-variety production demands.
With 27 years of experience in the field of automated packaging, Marchi Packaging Machinery provides reliable solutions ranging from single machines to full production lines for dairy manufacturers based on solid manufacturing experience and full-line integration capabilities, helping customers realize cost reduction, efficiency improvement and quality upgrading in packaging procedures.
