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elinpack & Yili: Project Delivery of elinpack’s 25kg Whole Milk Powder Fully Automated Packaging and Robotic Palletizing Line
elinpack & Yili: Project Delivery of elinpack’s 25kg Whole Milk Powder Fully Automated Packaging and Robotic Palletizing Line
Sep Tue,2026
In the production operations of large-scale food enterprises, packaging is not merely the critical final step before product dispatch, but a pivotal link governing overall
operational efficiency.As a leading brand in China’s dairy industry, Yili has seen continuous production expansion, leaving traditional labor-intensive packaging methods increasingly inadequate. Stringent requirements — such as dust-tight workshop environments, high-precision metering, and uninterrupted high-load line operation — have progressively imposed higher demands on packaging systems. For a top-tier enterprise like Yili, these challenges define exceptionally high engineering benchmarks for further packaging process upgrades.
Recently, the integrated production line featuring elinpack’s custom-engineered ABP-580 Fully Automated Heavy-Bag Bottom-Fill Packaging System & Palletizing System was successfully delivered to Yili on schedule. This milestone not only validates elinpack’s manufacturing prowess in high-end powder automation equipment, but also serves as a benchmark for meeting a dairy giant’s rigorous requirements through precision engineering and robust execution.
I. Benchmark Pain Points: Four Core Challenges in 25kg Whole Milk Powder Packaging & Palletizing
Given the unique material properties and packaging specifications of 25kg whole milk powder, elinpack’s engineering team conducted an in-depth review
of the full-process technical challenges at the initial stage of solution design.
Dust Contamination in Workshops and Sensor Malfunctions:
Whole milk powder features high fat content and fine particle size, making it highly susceptible to adhesive airborne dust during high-speed filling and air evacuation. If sealing and dust extraction are incomplete, overflowing dust readily adheres to workshop photoelectric sensors and mechanical slide rails, triggering signal drift, frequent false alarms, and even compromising cleanroom hygiene standards.
Exacting Weight Tolerance Demands for 25kg Large Packaging:
For a heavy-duty specification of 25kg, minor fluctuations in powder batch density are exponentially magnified. Achieving an error tolerance tightly controlled within 0 to +40 g while maintaining a throughput of 120 to 180 bags/h places extreme demands on the dynamic responsespeed of load cells and the instantaneous control of auger/screw cutoff mechanisms.
Inadequate Bag Permeability Causing Bag-Top Ballooning and
Palletizing Instability: After filling and sealing 25 kg milk powder bags, excessive residual air remains inside the bag, and powder fluidity is not yet stabilized, leaving the bag in a loose, soft state characterized by a "bulky middle and weak ends". If subjected directly to robotic palletizing without sufficient air evacuation and physical shaping, the bag easily suffers from center-of-gravity imbalance, sagging corners, and carries high risks of tilting or load collapse when entering Yili’s Automated Storage and Retrieval System (AS/RS) or during forklift transit.
Outer Bag Damage Caused by High-Speed Robotic Gripping:
25 kg heavy bags generate significant inertia during high-speed pick-and-place operations. Traditional pneumatic suction pads are prone to pressure loss and dropped bags due to paper bag permeability and dust accumulation, whereas standard rigid side-clamping jaws easily tear and abrade the outer walls of multi-layer composite paper bags during high-speed swings, creating severe risks to food packaging integrity.
25 kg heavy bags generate significant inertia during high-speed pick-and-place operations. Traditional pneumatic suction pads are prone to pressure loss and dropped bags due to paper bag permeability and dust accumulation, whereas standard rigid side-clamping jaws easily tear and abrade the outer walls of multi-layer composite paper bags during high-speed swings, creating severe risks to food packaging integrity.
II. Solution Implementation: elinpack’s Full-Chain Engineering Standard Practices
To address the aforementioned stringent metrics, elinpack custom-developed a system-level solution based on its proprietary core technology platform—the Fully Automated Heavy-Bag Bottom-Fill Packaging System & Palletizing System—optimizing mechanical configurations, electrical protection, and process details:
1. Upstream High-Precision Packaging (ABP-580 Core Drive via Negative-Pressure Degassing and Sealed Filling)
The ABP-580 machine and its core electrical control cabinet strictly comply with IP65 waterproof and dustproof standards, supporting high-pressure washdown in workshop environments.
It features a built-in sealed degassing/filling mechanism integrated with a negative-pressure dust suppression system, directly resolving issues associated with whole milk powder—such as high gas content, high material surface levels leading to poor sealing, subsequent bag ballooning during palletizing, and load instability during transit.
It features a built-in sealed degassing/filling mechanism integrated with a negative-pressure dust suppression system, directly resolving issues associated with whole milk powder—such as high gas content, high material surface levels leading to poor sealing, subsequent bag ballooning during palletizing, and load instability during transit.
The degassing unit rapidly compacts the powder in a short timeframe, ensuring an aesthetically pleasing bag profile, neat palletized loads, and reliable stability during transit.Utilizing a bottom-fill design with a unique bag-neck clamping collar, it effectively controls dust emissions during filling to guarantee zero dust leakage. Multi-axis closed-loop servo control ensures that the 25 kg filling tolerance is firmly locked within 0 to +40 g under a stable production rhythm of 120 to 180 bags/h.
2. Midstream In-Line Quality Inspection (Flat De-aeration and Intelligent Rejection)
After the bag is heat-sealed by the automatic packaging machine and transferred to the bag-turning station, it smoothly enters the flattening/compaction unit, molding the bag into a flat, compact "standard brick shape". Metal detection and a dynamic checkweigher are integrated in-line, enabling millisecond-level automatic rejection of defective products exceeding weight tolerances or containing contaminants. A matching intelligent buffer conveyor balances upstream and downstream throughputs, eliminating bottlenecks and the risk of cascading line stoppages.
3. Downstream: Efficient and Stable Intelligent Robotic Palletizing System
The robotic arm is equipped with a specially developed "bottom-support flexible load-bearing gripper", utilizing an alloy baseplate to share the entire weight load, completely eliminating the risk of outer bag tearing during high-speed handling. Built-in self-adaptive interlocking pattern algorithms (such as standard block patterns and staggered tier configurations) ensure that complete pallets are compact, vertical, and square-edged, perfectly matching AS/RS warehousing and logistics transfer standards. An automatic pallet magazine ensures smooth, automated circulation of
empty and full pallets.
III. Quality Validation: Achieving Reliable Delivery Through High OEE Performance
III. Quality Validation: Achieving Reliable Delivery Through High OEE Performance
The ultimate criterion by which large dairy enterprises measure the value of an automated production line lies in its post-commissioning Overall Equipment Effectiveness (OEE). Guided by engineering OEE targets, elinpack embedded this focus throughout every phase, from manufacturing and
machining to factory acceptance testing (FAT):
Rigorous Loaded FAT (Factory Acceptance Testing) Verification
In elinpack’s factory acceptance testing, Yili’s actual operational conditions were fully simulated, utilizing whole milk powder for continuous, multi-batch, full-load material testing. Operating at the designed throughput of 120–180 bags/h, the ABP-580 stably met the 25 kg (0 to +40 g) metering accuracy standard, while sealing pass rates and rejection responses maintained millisecond-level stability.
Full-Factor Guarantees for High OEE Performance
High Time Operating Rate: The application of highly reliable industrial components and anti-accumulation structural designs drastically reduces unexpected downtime caused by frequent powder cleanups, jammed bags, or mechanical faults, significantly cutting down auxiliary time lost during product changeovers.
High Operating Speed Performance Rate: Elimination of throughput gaps between the ABP-580 packaging host and downstream palletizing ensures flexible, self-adaptive line conveyance, preventing throughput losses caused by material accumulation, speed reductions, or idling wait times.
High Product Pass Rate: Closed-loop servo metering linked with inline precision checkweighing and rejection ensures that out-of-specification bag rates and pallet molding rates surpass industry norms, minimizing material waste and bag breakage risks.
Food-Grade Human-Machine Safety Engineering: Palletizing zones and transmission stations are equipped with physical safety fencing complying with international standards, dual-channel safety light curtain interlocks, and emergency stop mechanisms. IP65 electrical isolation and low-noise mechanical designs provide a safe and compliantworking environment for workshop operators and maintenance personnel.
Modular Rapid Assembly and Smooth Commissioning:
Standardized piping and mechanical quick-coupling interfaces are adopted throughout the line, substantially compressing on-site assembly and joint-debugging cycles to help Yili’s plant rapidly ramp up to full production capacity.
Translating the rigorous technical specifications of a major dairy enterprise into robust engineering parameters for stable line operation is the enduring
manufacturing ethos upheld by elinpack. The successful delivery of this ABP-580 fully automated whole milk powder packaging machine and robotic palletizing system once again reaffirms elinpack’s hard-core competence in the field of non-standard heavy-load automation integration for the food and dairy industries. Moving forward, elinpack will continue to deeply cultivate precision machinery manufacturing and systems engineering, safeguarding the high-standard intelligent transformation of China’s dairy industry.