Among the vast range of chemical raw materials, caustic soda (sodium hydroxide, commonly known as lye and caustic alkali), a basic industrial raw material, plays an indispensable role in numerous fields including alumina production, sewage treatment, papermaking, printing and dyeing, soap manufacturing, detergent production and petrochemical industry. With the global caustic soda packaging market sales volume reaching 1.183 billion yuan in 2026, market requirements for packaging efficiency and quality of powder and granular materials such as caustic soda, soda ash, sodium bicarbonate, titanium dioxide, calcium chloride, calcium carbonate, zinc oxide, aluminum hydroxide, diammonium phosphate and compound fertilizer keep rising. As a powerful original manufacturer specializing in packaging production lines, Marchi Packaging Equipment has been deeply engaged in the field of automatic packaging for 27 years, committed to providing standardized and customized integrated packaging production line solutions for fine chemical, food raw material, new energy material and other industries.
I. Large-scale Intelligent Manufacturing Layout Consolidates Strength as an Original Manufacturer
Marchi Packaging Equipment has built a dual production and service system consisting of Guangzhou Marchi Factory and Hefei Marchi Production Base, forming an operation mode of coordinated northern and southern production and simultaneous services. The Guangzhou factory is located in Liandong U Valley, Shilou Town, Panyu District, with a workshop area of over 4,000 square meters; the Hefei production base is situated in Shuangfeng Economic Industrial Park, Changfeng County, Hefei City, Anhui Province, with a building area of over 5,500 square meters. The two factories together possess more than 9,500 square meters of standardized production workshops, realizing independent R&D and production of core equipment components and full-process in-house manufacturing. The enterprise has set up eleven professional business divisions, whose business covers vertical packaging machines, pre-made pouch packaging machines, heavy bag packaging machines, bulk bag packaging machines and full-line integrated systems.
II. Analysis of Core Advantages of Caustic Soda Packaging Machine
Targeting packaging difficulties of highly corrosive and hygroscopic materials such as caustic soda and sodium hydroxide, the fully automatic MCZD-25K packaging unit launched by Marchi replaces manual weighing, bag sleeving, conveying and other procedures with accurate and reliable mechanical operation, featuring a high degree of automation and effectively reducing labor intensity of workers. The unit integrates functions including automatic weighing, automatic bag loading, automatic filling, automatic bag delivery and automatic sealing. All execution units are equipped with control and safety devices to realize continuous automatic operation and guarantee safe and convenient operation. Adopting a fully enclosed design and fitted with safety interlock devices such as door opening detection, it fully safeguards the operation safety of staff.
The equipment is equipped with a high-precision metering system, which adopts two-stage coordinated operation of fast feeding and slow fine compensation through variable frequency speed regulation. Stable core weighing and metering accuracy helps customers reduce material loss and improve production efficiency. The machine is equipped with complete error-proof mechanisms: it automatically stops feeding when no bags or incompletely opened bags are detected, stops discharging if bags fail to open, and skips sealing without bags or materials, fundamentally eliminating material waste and defective packages. In view of the chemical properties of materials like caustic soda, all parts of the equipment in contact with materials are made of corrosion-resistant materials with sealed structures.
III. Key Equipment Parameters and Model Selection Suggestions
The maximum packaging capacity of the fully automatic MCZD-25K packaging unit is 4 to 6 bags per minute, with a filling weight of 10 to 25 kilograms per bag. It is compatible with various bag materials including paper bags, plastic bags and woven bags. The applicable bag size ranges from 600 to 1100 millimeters in length and 300 to 600 millimeters in width. The air consumption of the equipment is 750 standard liters per minute, and the total power is 3 kilowatts. Developed and designed for granular and flaky materials, the equipment ensures stable, reliable and efficient operation. During model selection, enterprises can carry out adaptive customization according to their own production capacity demands, packaging bag specifications and workshop working conditions.
IV. Wide Application Scenarios
The MCZD-25K caustic soda packaging machine is not only applicable to the automatic packaging of caustic soda and sodium hydroxide, but also shows excellent adaptability in the subdivision field of automatic packaging of powder and granular materials. It is widely used for materials in the fine chemical industry such as soda ash, sodium bicarbonate and titanium dioxide pigments; food raw materials including flour, starch, milk powder, protein powder and additives; new energy material powders such as lithium iron phosphate, anode materials and lithium carbonate; as well as various chemical and industrial raw materials including potassium chloride, calcium carbonate, zinc oxide, aluminum hydroxide, potassium perchlorate, pharmaceutical intermediates, compound fertilizer, manganese powder, calcium powder, silicon powder, gypsum powder, lime powder, talcum powder, bentonite, titanium dioxide, polymer powder and metal oxide powder.
V. Detailed Introduction to Fully Automatic Packaging Operation Process
The complete operation flow of Marchi caustic soda packaging machine covers full-chain automatic operation from feeding to finished product output. The specific procedures are as follows: Feeding and Lifting: Caustic soda materials are sent into the silo of the packaging machine via lifting equipment with fully enclosed conveying to effectively control dust overflow. Automatic Weighing and Filling: The equipment adopts a high-precision weighing system with a servo motor directly driving the screw to guarantee weighing speed and accuracy. The weighing sensor and weighing controller process weighing signals and output weight display data and control signals. The two-stage operation mode of fast feeding plus slow fine compensation ensures highly consistent net weight of each bag. Automatic Bag Loading: The unit 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. The whole bag loading process includes picking bags from the storage bin, centering and positioning bags, forward conveying of bags, bag mouth positioning, pre-opening of bag mouths, inserting the cutter of the bag loading manipulator into bag mouths, and clamping both sides of bag mouths by pneumatic grippers to complete bag loading. Automatic Sealing: After filling, the equipment automatically carries out sealing and stitching operations. In response to the particularity of caustic soda packaging, the sealing system ensures tight closure to prevent moisture and water from entering. Rear-end Inspection and Conveying: Sealed finished bags go through re-inspection weighing, metal detection and other procedures. Qualified products are conveyed in order through multiple conveying units including bag invertors, merging conveyors, bend conveyors, slope conveyors, transition conveyors, square roller conveyors, shaping and flattening machines, buffer stop conveyors and grouping conveyors. Automatic Palletizing: Grouped bags are accurately grabbed by manipulators of the palletizing mechanism according to preset programs to complete stacking operations. The whole process runs automatically and continuously, drastically reducing manual intervention.
VI. Solutions to Customer Pain Points
Enterprises generally face the following pain points in the packaging production of caustic soda and sodium hydroxide:Pain Point 1: Flying dust and workshop environmental pollutionMaterials such as caustic soda tend to generate dust during packaging, which not only pollutes the workshop environment but also poses a threat to the health of operators.Solution: MCZD-25K adopts a fully enclosed design and closed conveying structure to effectively control dust generation and diffusion during packaging, realizing dust-free operation from filling to sealing.
Pain Point 2: Strong material corrosion leading to poor equipment durabilitySodium hydroxide is strongly alkaline and corrosive, and ordinary equipment is prone to damage after long-term use.Solution: Marchi adopts corrosion-resistant materials and sealed structures tailored to the characteristics of corrosive materials to ensure long-term stable operation of the equipment in corrosive environments.
Pain Point 3: Low efficiency and high labor intensity of manual packagingTraditional semi-automatic or manual packaging involves cumbersome procedures and requires a large number of workers.Solution: The fully automatic MCZD-25K packaging unit realizes full-process automation covering automatic weighing, automatic bag loading, automatic filling, automatic sealing and rear-end conveying and palletizing. Only a small number of patrol inspectors are required for the whole production line. Enterprises can effectively save labor costs and transfer staff from physical labor to equipment management work.
Pain Point 4: Insufficient metering accuracy resulting in material loss and customer complaintsInaccurate weighing directly affects enterprises' cost control and customer satisfaction.Solution: Marchi adopts high-precision weighing systems and servo motor drive technology for stable and reliable packaging accuracy. The stable core weighing and metering accuracy helps customers effectively control material loss.
Relying on more than 20 years of R&D experience and intelligent manufacturing capacity, Marchi Equipment Company continuously provides efficient, stable and safe integrated automatic packaging production line solutions for manufacturers of chemical raw materials such as caustic soda and sodium hydroxide. From single equipment to full-line integration, from scheme design to installation, commissioning and lifelong maintenance, Marchi is committed to assisting chemical enterprises in completing intelligent production upgrading with solid intelligent manufacturing capabilities.
