With the in-depth implementation of the new national standards for infant formula milk powder and continuous improvement of consumers’ requirements for dairy product quality, nitrogen-filled packaging has become a core technical means to guarantee product freshness and extend shelf life during milk powder production. As a powerful original manufacturer with 26 years of experience in packaging machinery, Guangzhou Marchi Packaging Equipment Co., Ltd. and Hefei Marchi Packaging Equipment Co., Ltd. leverage the collaborative manufacturing advantages of dual production bases to provide fully automatic integrated nitrogen-filled packaging and palletizing solutions covering the whole process from material feeding to palletizing for milk powder and various powder materials.
I. Working Principle of Nitrogen Flush Freshness-Locking Technology and Core Equipment Advantages
The core technical principle of nitrogen-filled packaging for milk powder adopts a two-step process of "vacuum pumping + nitrogen displacement": the equipment first extracts air inside packaging bags via a negative pressure system to reduce oxygen concentration, then injects high-purity nitrogen (purity ≥99.5%) into the bags. Relying on the inert property of nitrogen, oxygen is isolated to effectively inhibit fat oxidation and microbial reproduction in milk powder. Marchi nitrogen-filled packaging machines are equipped with a three-stage vacuum displacement system; the measured residual oxygen content can be controlled below 0.3%, and an online nitrogen purity monitoring module is configured.
The advantages of Marchi’s fully automatic milk powder packaging machines are summarized as follows:Intelligent control systemEquipped with a PLC intelligent control system and human-machine interface, the machine delivers intuitive and convenient operation. It can monitor operating status in real time and adjust parameters according to production demands to ensure accurate metering and ideal packaging effect for each bag of products.
High-precision metering and feedingThe weigher adopts vertical single-screw feeding. The screw is directly driven by a servo motor; weighing sensors and weighing controllers process signals in real time and output weight data, achieving packaging accuracy of ±0.1%～0.2%.
Automatic bag width adjustmentBag width adjustment is motor-controlled. All clamping hands can be synchronously adjusted with one single button to quickly switch between different bag specifications and drastically shorten product changeover time.
Multiple safety detection and protection functionsThe machine features multiple protection mechanisms: no feeding without bags or incompletely opened bags, no discharging without bag opening, no sealing without bags or feeding. Optional functions including door opening alarm, ribbon missing alarm, insufficient air pressure alarm and abnormal sealing temperature alarm enable timely machine shutdown upon abnormalities.
Sanitation-grade material standardsAll parts in contact with materials are made of 304/316 stainless steel or food-grade plastic to comply with food hygiene requirements.
II. Wide Application Scenarios and Material Adaptability
Marchi milk powder packaging machines are applicable not only to dairy products including whole milk powder, skim milk powder, infant formula milk powder, adult milk powder, middle-aged and elderly milk powder and modified milk powder, but also widely used for automatic packaging of goat milk powder, cow milk powder, soymilk powder, soybean powder, protein powder, whey powder, non-dairy creamer, maltodextrin, condensed milk powder, cream powder, collagen powder, rice protein powder, glucose powder, corn starch, potato starch, cocoa powder, matcha powder, coconut milk powder, almond powder, oat powder, black bean powder, sesame paste powder, meal replacement powder, mixed grain powder, grain powder, solid beverages, milk tea powder, coffee powder, seasoning powder, premix powder, baking powder, enzyme powder, probiotic powder, nutritional food additives and other powdery materials.
The machine supports composite films such as PE composite film, aluminum foil film and aluminized film, and adapts to various bag types including stand-up pouches, zipper pouches, angle spout stand-up pouches and flat pouches (3-side sealed bags, 4-side sealed bags, hand-held bags, back-sealed bags, gusseted bags, etc.).
III. Complete Fully Automatic Packaging and Palletizing Process
Marchi’s fully automatic milk powder packaging production line forms a closed-loop workflow from material feeding to finished product warehousing. The technological process of the entire production line is as follows: Feeding → Mixing → Lifting → Auger metering → Automatic packaging → Heat sealing & bag stitching → Weight inspection → Metal detection → Robotic palletizing → Warehousing system.
Taking the MCGD8-230 fully automatic premade bag packaging machine as an example for the core packaging process, the packaging procedures are rigorous and detailed:
Bag loading: The machine automatically picks bags from the bag storage bin, conveys them forward after centering positioning, and completes bag mouth positioning and pre-opening.
Coding: Prints production date, batch number and other information.
Zipper opening: Automatically opens zippers for zipper pouch styles.
Bag opening: The cutter of the bag loading manipulator inserts into the bag mouth, and pneumatic grippers on both sides clamp the bag mouth to finish bag opening.
Metering and discharging: Vertical single-screw feeding driven directly by a servo motor; weighing sensors and weighing controllers process signals and output weight data in real time to guarantee both metering speed and precision.
Bag mouth cleaning: Cleans the bag mouth to ensure sealing quality.
Heat sealing: Performs sealing treatment on the bag mouth.
Shaping: Shapes finished packages to guarantee neat appearance.
After packaging, finished products are transported by conveyor belts to weight inspection and metal detection procedures to automatically reject unqualified products; qualified products are palletized automatically by robots and finally delivered into the warehousing system. The whole production line realizes fully automatic operation from feeding to palletizing and warehousing, effectively reducing manual intervention and helping manufacturers cut costs and improve efficiency.
IV. Customer Pain Points and Systematic Solutions
Pain Point 1: Milk powder oxidizes and deteriorates, making shelf life difficult to guarantee.Nutrients such as unsaturated fatty acids abundant in milk powder are extremely sensitive to oxygen; oxidation leads to nutrient loss and flavor deterioration.Solution: Marchi nitrogen-filled packaging machines adopt a dual-cycle system of "pre-vacuum pumping + dynamic nitrogen replenishment". The three-stage vacuum displacement system stably controls residual oxygen content below 0.3%, paired with online nitrogen purity monitoring to maintain optimal nitrogen-filled fresh-keeping conditions for each bag of milk powder.
Pain Point 2: Large-bag products tend to agglomerate and lose flowability during palletizing.Heavy compression during palletizing of 25kg large-bag milk powder often causes milk powder to compact and agglomerate under intense vacuum extrusion.Solution: Marchi fully automatic milk powder packaging machines adopt the process of "vacuum pumping first followed by high-purity nitrogen filling". Food-grade nitrogen is injected after air evacuation to form mild slight positive pressure inside bags, which isolates oxygen while reserving buffer space. The powder will not compact into hard lumps during long-distance transportation and multi-layer palletizing, maintaining stable flowability after bag opening.
Pain Point 3: High labor costs restrict production efficiency.Traditional packaging relies heavily on manual operation with low efficiency and high error rates.Solution: Marchi fully automatic packaging machines integrate automatic metering, automatic bag loading, automatic filling, nitrogen flushing and automatic heat sealing & stitching into one operation, drastically reducing manual participation. After a well-known milk powder manufacturer introduced Marchi milk powder packaging machines, the efficiency of its production line increased by nearly 40%.
Pain Point 4: Difficulty in equipment selection and production line matching.Different milk powder categories and packaging specifications impose varying requirements on equipment.Solution: Marchi provides one-on-one whole factory design services and supports non-standard customization. It delivers full-cycle customized services covering equipment selection, whole factory scheme design, installation & commissioning and operator training.
V. Core Equipment Parameters
Main parameters of Marchi MCGD8-230 fully automatic premade bag packaging machine are as follows:
Equipment Model: MCGD8-230
Packaging Size L×W: (50～320)×(100～230) mm
Packaging Speed: 25～70 bags per minute
Applicable Materials: PE composite film, aluminum foil film, aluminized film and other composite films
Applicable Bag Types: Stand-up pouches, zipper pouches, angle spout stand-up pouches, flat pouches
Bag Width Adjustment: Automatic adjustment
Power Supply: 380V 50Hz, 6.5kW
Compressed Air: 0.6–0.8 MPa, 0.5 m³/min
As two core production bases of Marchi Group, Guangzhou Marchi and Hefei Marchi have built a complete matrix of powder packaging equipment covering food, pharmaceutical, chemical and other sectors based on 26 years of industry accumulation and over 5,000 cooperative customer cases. Its products are exported to numerous countries and regions worldwide, and the company has become a long-term partner of many large-scale food, pharmaceutical and chemical enterprises. From standalone machines to whole factory turnkey solutions, Marchi is committed to providing professional and systematic integrated nitrogen-filled powder packaging and palletizing solutions for global customers.
