In the production and circulation links of alumina, aluminum hydroxide and various ultra-fine powders, the packaging process is often a key node affecting overall plant efficiency and production environment. Especially for activated alumina, flame-retardant grade aluminum hydroxide, high-white filler aluminum hydroxide and alumina micropowder, enterprises are generally faced with challenges such as high air content, uneven fluidity, easy dust emission and high labor intensity of manual bagging.
As an original machinery manufacturing enterprise with independent R&D strength, Guangzhou Marchi Packaging Equipment Co., Ltd. relies on years of technical accumulation in the field of powder packaging, and launches fully automatic heavy bag packaging production lines and semi-automatic bottom-filling degassing packaging machines. Its products have been applied and implemented in many regions nationwide including Shandong, Henan, Shanxi, Guangdong, Sichuan, Liaoning and Xinjiang. Combined with actual working conditions, this paper elaborates on the technical advantages, packaging process and common pain point solutions of Marchi alumina packaging series.
I. Accurate Model Selection: How to Choose Between Fully Automatic and Semi-automatic
According to different enterprise automation levels, factory conditions and budgets, Guangzhou Marchi mainly recommends the following two core equipment:
Category 1: Fully Automatic Alumina Heavy Bag Packaging Machine
The unit consists of a bag storage warehouse, bag picking and arranging device, bag feeding manipulator, bag clamping and discharging device, bag holding and pushing device, bag mouth guiding device and other components, realizing unmanned operation of automatic metering — automatic bag feeding — automatic filling — automatic heat sealing and sewing. The weighing system adopts vertical single screw feeding directly driven by a servo motor to ensure metering accuracy and speed.
Key Parameters:
Packing weight range: 5～25 kg
Packaging accuracy: ≤±0.1～0.2%
Packaging speed: 1.5～2 bags per minute
Bag size: Length 500～1000 mm
Applicable bag materials: Laminated kraft paper bag, woven bag, plastic woven bag, plastic bag, etc.
Category 2: Semi-automatic 25kg Bottom-filling Packaging Machine
Adopting bottom-filling type filling, the filling inlet feeds materials from the bottom with small drop and no dust emission. It is suitable for materials with large fluidity difference such as ultra-fine aluminum hydroxide powder, white carbon black, precipitated barium sulfate, talc powder and heavy calcium carbonate. It features all stainless steel structure, PLC control and touch screen operation, with up to 10 groups of formula storage.
Key Parameters:
Packing weight: 5～25 kg
Packaging accuracy: ±0.1～0.5%
Packaging speed: 1～4 bags per minute
Power supply: 3P AC 208～415V 50/60Hz
Total power: 2.87 kW
Overall weight: 450 kg
II. Core Configuration and Process Details: Full Chain from Feeding to Palletizing
Taking a complete aluminum hydroxide degassing packaging production line as an example, the operation process of Marchi equipment is clearly divided into the following links:
- Bag Preparation and Bag Feeding
The fully automatic production line stores prefabricated bags (woven bags or kraft paper bags) in the bag storage warehouse. The bag arranging device centers and positions the bags, the manipulator blade inserts into the bag mouth, and air grippers clamp both sides of the bag mouth to complete bag feeding. For the semi-automatic line, bags are manually sleeved and automatically clamped by the pneumatic bag clamping device.
- Metering, Filling and Degassing
Degassed aluminum hydroxide powder enters the vertical screw feeding mechanism, and servo control realizes dual feeding of high-speed and fine dosing. For ultra-fine powder with high air content, the degassing device is started synchronously to discharge internal air of materials, avoiding splashing or uneven sealing caused by air pressure accumulation in the bag.
- Bag Mouth Guidance and Sealing
Filled bags are sent to the bag mouth guiding mechanism by the bag holding and pushing device, and then enter the integrated heat sealing and sewing machine. According to bag material types, it can select woven bag edge folding sewing, hot melt adhesive sealing or kraft paper heat sealing, with beautiful and firm sealing effect.
- Conveying and High-level Palletizing
Sealed finished bags are sent to the high-level palletizing station through a variable frequency belt conveyor. Marchi supporting palletizers group layer by layer according to preset stacking types such as five-flower stack or rotary stack. Each layer is leveled and sorted by the flattening mechanism to ensure neat stack shape. Finally, the whole stack is delivered out and directly connected with forklifts for warehousing.
III. Targeted Solutions for Customer Pain Points: Three Major Problems of Dust, Degassing and Accuracy
In serving aluminum hydroxide powder production and processing enterprises in Hunan, Jiangxi, Fujian, Yunnan, Guizhou, Inner Mongolia and other regions, Guangzhou Marchi has summarized three most concerned problems and put forward targeted solutions:
Pain Point 1: Severe dust emission during packaging, failing to meet workshop environmental protection standards.
Solution: The fully automatic model is equipped with negative pressure dust collection interface and sealed bag clamping device, with the filling inlet closely fitted with the bag mouth; the semi-automatic model adopts bottom-filling filling mode with materials fed from the bottom, and raised dust is quickly extracted by the equipment’s built-in dust cover to control dust emission from the source.
Pain Point 2: Aluminum hydroxide powder has high air content, causing bag bulging after filling and easy material leakage at the sealing position.
Solution: An efficient degassing cavity is integrated in the filling head. Materials pass through the degassing screw before entering the bag to effectively discharge air, making bagged materials compact and convenient for sealing and palletizing. The degassing time and vacuum degree can be adjusted according to different meshes such as 1250-mesh aluminum hydroxide micropowder.
Pain Point 3: Slow manual bagging speed and large metering fluctuation.
Solution: The fully automatic model completely cancels manual bagging, which is completed by manipulators and bag storage warehouse, steadily supporting the packaging rhythm of 1.5-2 bags per minute. The weighing system adopts high-resolution sensors and has automatic drop correction function, maintaining accuracy within ±0.2% even with changes in material bulk density.
IV. Summary
In the field of powder packaging, the upgrading from single machine automation to whole line intelligence is an important path for enterprises to reduce costs, improve efficiency and achieve green development. With 26 years of industry experience, Guangzhou Marchi Packaging Equipment has continued to deepen product lines such as alumina packaging machine, aluminum hydroxide packaging machine, alumina powder packaging machine, alumina large bag packaging machine, aluminum hydroxide degassing packaging machine and aluminum hydroxide powder packaging machine. With precise metering, dust-free environmental protection and stable operation as the core design, it provides implementable one-stop packaging solutions for chemical, metallurgy, new energy and other industries. In the future, with the continuous maturity of intelligent manufacturing technology, Marchi will continue to promote packaging equipment towards higher efficiency, more economy and environmental protection, helping powder production enterprises realize high-quality packaging.
