Choosing the right milk powder filling line is an important decision for factories that need accurate, hygienic and efficient can packaging. A suitable line should match the powder filling requirements, can size, filling weight, production capacity, filling accuracy and product protection requirements.

For milk powder packaging, a complete automatic line can include can unscrambling, UV sterilization, weighing type powder filling, vacuum nitrogen flushing and can sealing, can body cleaning, capping and can collecting.

The right configuration depends on the actual packaging requirements of your factory. This guide explains the main factors to consider before purchasing a milk powder filling line and how each part of the line contributes to the packaging process.

What Is a Milk Powder Filling Line?

A milk powder filling line is an automated packaging system used to fill milk powder into cans or other suitable containers and complete the following packaging processes.

A typical line may include:

• Can unscrambling

• UV sterilization

• Powder filling

• Vacuuming

• Nitrogen filling

• Can sealing

• Can body cleaning

• Capping

• Can collecting

Each machine performs a specific function. The machines work together to move cans through the packaging process with less manual handling.

For milk powder packaging, the filling system is one of the most important parts of the line. A weighing type powder filling machine can use a two stage filling process to improve filling accuracy. The large screw first fills most of the target weight, while the small screw completes the remaining amount according to weighing feedback.

The sealing process is also important because milk powder can be sensitive to oxygen and moisture. A vacuum and nitrogen filling process can reduce the oxygen inside the can before sealing.

Therefore, when choosing a milk powder filling line, it is better to evaluate the complete packaging process rather than looking at the filling machine alone.

8 Key Factors to Consider When Choosing a Milk Powder Filling Line

1. Consider the Characteristics of Your Milk Powder

Different powder products can have different flow characteristics. Powder density, particle size, moisture content and flowability can affect the filling process.

Milk powder can also produce dust during filling. Therefore, the filling system should be selected according to the actual product and filling requirements.

Before purchasing a powder filling machine, it is recommended to test the actual milk powder with the filling equipment. A material test can help determine whether the screw filling system, weighing system and other machine settings are suitable for the product.

This is especially important when filling accuracy is a key requirement.

A supplier should understand the actual product instead of selecting a machine based only on a general powder filling specification.

2. Determine the Required Filling Weight

Filling weight is another important factor when selecting a milk powder filling line.

For example, a factory may need to fill different can sizes or different product specifications. The filling system should therefore be selected according to the required filling range.

The filling weight can affect:

• Screw size

• Weighing system

• Filling speed

• Machine configuration

• Filling accuracy

Before requesting a quotation, it is useful to provide the supplier with the target filling weight and any other filling specifications.

If several filling weights will be used in the future, this should also be considered during the initial machine selection.

3. Pay Attention to Filling Accuracy

Filling accuracy is one of the most important considerations for milk powder packaging.

An inaccurate filling process can lead to inconsistent product weight and unnecessary product loss. For this reason, factories with strict weight requirements may consider a weighing type milk powder filling machine.

The dual screw system used in a weighing type powder filling machine does not mean that two cans are filled at the same time.

Instead, the two screw heads work on the same can in two stages.

The large screw first fills most of the target weight. The weighing system then checks the actual weight. Based on the weighing feedback, the small screw fills the remaining amount.

For example, if the target filling weight is 1,000 grams, the large screw may first fill most of the required amount. The system then checks the actual weight and calculates the remaining amount. The small screw completes the final filling.

This two stage process allows the machine to combine faster main filling with more precise fine filling.

4. Check Can Size and Container Compatibility

The can size should be confirmed before selecting the filling line.

Important information includes:

• Can diameter

• Can height

• Can shape

• Can material

• Filling weight

• Lid type

• Cap type

The dimensions of the can affect the design and adjustment of different machines in the line. For example, the can unscrambler needs to handle the empty cans correctly. The powder filling machine needs to position the cans accurately under the filling head. The can sealing machine needs to match the can and lid. The capping machine also needs to accommodate the can height and cap specifications.

If your factory plans to use different can sizes, tell the supplier before ordering the line. The machine configuration can then be evaluated according to your actual requirements.

Providing can samples is also helpful when discussing a new packaging project.

5. Match the Production Capacity of the Complete Line

Production capacity should not be determined only by the maximum speed of the powder filling machine.

A complete milk powder filling line contains several machines. These machines need to work together at a suitable speed.

The main equipment may include:

Can Unscrambler → UV Sterilization Machine → Powder Filling Machine → Vacuum Nitrogen Flushing and Can Sealing Machine → Can Cleaning Machine → Capping Machine → Can Collecting Machine

If one machine is significantly slower than the other machines, it can affect the overall production output.

For this reason, the required production capacity should be discussed with the supplier before selecting the equipment.

You should provide information such as:

• Required cans per hour

• Required cans per minute

• Filling weight

• Can size

• Working hours per day

• Expected future production capacity

This information helps the supplier recommend a more suitable line configuration.

6. Consider Nitrogen Flushing Requirements

Nitrogen flushing is an important consideration for many milk powder can packaging applications.

After powder filling, the can may contain air. The vacuum and nitrogen flushing process can help reduce the oxygen content inside the can before sealing.

A typical process is:

Vacuuming → Nitrogen Filling → Can Sealing

The vacuum system removes air from the can. Nitrogen is then filled into the can before the container is sealed.

For the specified can sealing machine, the residual oxygen content can be less than 3% under suitable operating conditions.

Reducing oxygen exposure can help protect product quality and support a longer shelf life when combined with suitable packaging materials, sealing conditions and storage conditions.

The actual nitrogen requirement should be discussed according to the product and packaging requirements rather than assuming that every milk powder product needs exactly the same settings.

7. Consider Hygiene and Powder Dust Control

Hygiene is an important consideration when packaging milk powder.

The empty cans should be properly handled before filling. A UV sterilization machine can be installed at the beginning of the packaging line to provide UV treatment and air cleaning.

The specified UV sterilization machine combines:

• Can inversion

• Air blowing

• UV sterilization

• Ionized air cleaning

• Static removal

• Hair and dust removal

After powder filling and can sealing, some powder may remain on the outside surface of the can.

A can body cleaning machine can then remove powder and dust from the outer surface. The specified cleaning equipment can remove more than 95% of the powder and dust under suitable operating conditions.

These processes help keep the cans cleaner throughout the packaging process and reduce the need for manual cleaning.

8. Choose the Appropriate Level of Automation

The required level of automation depends on production capacity, labor availability, factory layout and production plans.

For a fully automatic packaging process, the machines can be connected to form a continuous line.

The packaging process can start with empty can unscrambling and continue through sterilization, powder filling, vacuum nitrogen flushing, can sealing, can cleaning, capping and can collecting.

A higher level of automation can reduce manual handling between different packaging steps.

However, automation should be selected according to actual production requirements. A larger or more complex line is not necessarily the best choice for every factory.

The right solution should provide the required production capacity while keeping operation, adjustment and maintenance practical.

How Does a Two Stage Weighing Powder Filler Work?

A weighing type powder filling machine with two screw heads is designed to improve filling accuracy through a two stage filling process. It is important to understand that the two screw heads do not fill two cans at the same time. Both screw heads work on the same can.

Step 1: Main Filling

The large screw fills most of the required powder into the can. The large screw can move a larger amount of powder efficiently during the initial filling stage.

Step 2: Weighing

After the main filling stage, the weighing system checks the actual weight of the powder in the can. The system compares the actual weight with the target filling weight.

Step 3: Fine Filling

The small screw then fills the remaining amount according to the weighing feedback. This allows the machine to make a more precise final adjustment instead of relying only on the initial filling amount.

Step 4: Filling Completion

Once the target weight is reached, the filling process is completed and the can moves to the next stage. This two stage filling method is useful for applications where filling accuracy and weight consistency are important.

Why Is Nitrogen Flushing Important for Milk Powder Can Packaging?

Milk powder packaging can require protection from oxygen during storage. The vacuum nitrogen flushing process provides a way to reduce the air inside the can before sealing. The process generally includes three main steps.

Vacuuming

Air is removed from the can before nitrogen is introduced.

Nitrogen Filling

Nitrogen is filled into the can to replace part of the removed air.

Can Sealing

The can is sealed after the nitrogen filling process. The specified sealing machine can achieve residual oxygen content below 3% under suitable conditions.

The vacuum system uses fluorine rubber sealing rings designed for vacuum applications. These seals provide temperature resistance and help reduce leakage. The seaming rollers and chuck are made from Cr12 die steel, providing durable operation and reliable can sealing.

For a milk powder packaging project, the required residual oxygen level should be confirmed through actual testing and according to the customer's product and packaging requirements.

What Machines Are Needed for an Automatic Milk Powder Filling Line?

The exact configuration depends on the customer's requirements, but a complete automatic milk powder can packaging line may include the following equipment.

Can Unscrambler

The can unscrambler automatically arranges empty cans and transfers them into the production line. This reduces manual can handling at the beginning of the packaging process.

UV Sterilization Machine

The UV sterilization machine treats the empty cans before powder filling. The machine uses air blowing, UV sterilization and ionized air to help remove static, hair and dust.

Weighing Type Powder Filling Machine

The powder filling machine fills milk powder into the cans according to the required target weight. The two screw heads perform main filling and fine filling on the same can.

Vacuum Nitrogen Flushing and Can Sealing Machine

After filling, the can enters the vacuum and nitrogen flushing process. The machine automatically performs can feeding, lid placement, vacuuming, nitrogen filling and sealing. The Siemens PLC control system helps provide stable machine operation.

Can Body Cleaning Machine

After sealing, the can passes through the cleaning machine. This equipment removes powder and dust from the outer surface of the can.

Capping Machine

The capping machine presses and tightens the cap onto the sealed can. The machine can adapt to cans with different heights by adjusting the hand wheel. The capping roller uses silicone material designed to reduce damage to the cap.

Can Collecting Machine

The collecting machine receives the finished cans from the production line and organizes them for further handling.

How to Choose the Right Milk Powder Filling Line Configuration

There is no single configuration that is suitable for every milk powder packaging project. The line should be selected according to the actual requirements.

The most important point is to consider the entire packaging process.

For example, if accurate filling is the main requirement, the powder filling machine needs to be selected carefully. If product protection is also important, the vacuum nitrogen flushing and sealing process should be included.

If the customer has strict cleanliness requirements, the UV sterilization and can body cleaning processes should also be considered.

Complete Milk Powder Filling Line Workflow

A typical automatic milk powder can packaging line can follow this process:

1. Can Unscrambling

Empty cans are automatically arranged and transferred into the production line.

2. UV Sterilization

The cans are treated with air blowing, UV sterilization and ionized air cleaning to help remove static, hair and dust.

3. Weighing Powder Filling

The large screw first fills most of the target weight. The weighing system then checks the actual weight, and the small screw completes the remaining amount.

4. Vacuum Nitrogen Flushing and Can Sealing

The filled cans enter the sealing machine. Vacuuming, nitrogen filling and can sealing are completed automatically.

5. Can Body Cleaning

The sealed cans pass through the can cleaning machine to remove powder and dust from the outer surface.

6. Capping

The cleaned cans move to the capping machine for cap placement and tightening.

7. Can Collecting

The finished cans are collected and organized for the next handling or packaging process. This configuration provides a continuous packaging process from empty can handling to finished can collection.

Common Mistakes When Choosing a Milk Powder Filling Line

Choosing packaging equipment only by looking at the machine price or maximum speed can create problems later. The following are some common points that should be considered before purchasing.

Choosing Only by Maximum Speed

A high machine speed does not automatically mean higher production efficiency. The complete line needs to be balanced according to the required output.

Ignoring the Actual Powder

Different powder characteristics can affect filling performance. The actual milk powder should be tested before finalizing the filling system whenever possible.

Focusing Only on the Filling Machine

The powder filler is important, but it is only one part of the complete packaging line. Can unscrambling, sterilization, sealing, cleaning, capping and collecting also affect the overall packaging process.

Not Providing Can Samples

Can diameter, height, shape and lid specifications can affect machine configuration. Providing can samples or detailed can dimensions can help the supplier evaluate compatibility.

Not Considering Future Production Requirements

If production is expected to increase, this should be discussed before purchasing the line. A suitable packaging line can then be planned according to both current and expected production requirements.

Choosing Equipment Without Actual Testing

A machine specification cannot always show how a specific milk powder will behave during filling. Actual powder and can testing can provide more useful information for final equipment selection.

What Information Should You Prepare Before Contacting a Supplier?

Before contacting a milk powder filling line supplier, preparing detailed packaging information can make the technical discussion more efficient.

Product Information

Provide:

• Product name

• Powder characteristics

• Product density if available

• Powder sample if available

Filling Information

Provide:

• Target filling weight

• Filling weight range

• Required filling accuracy

• Required production capacity

Can Information

Provide:

• Can diameter

• Can height

• Can shape

• Can material

• Lid specifications

• Cap specifications

Packaging Requirements

Also provide:

• Whether vacuuming is required

• Whether nitrogen flushing is required

• Required residual oxygen level if available

• Required level of automation

• Available factory space

• Power supply information

The more complete the information, the easier it is for the supplier to recommend a suitable packaging line. For new projects, it is also useful to provide product and can samples for machine testing.

Why Choose Soonfer Machinery for Your Milk Powder Filling Line?

Choosing a packaging line supplier is not only about purchasing individual machines. The supplier should understand how the machines work together as a complete packaging system.

Soonfer Machinery focuses on bottle and can filling equipment and related filling lines. For milk powder packaging projects, the line can be configured according to the customer's product, can specifications, filling weight and production requirements.

The proposed packaging process can include:

Can Unscrambling → UV Sterilization → Weighing Powder Filling → Vacuum Nitrogen Flushing and Can Sealing → Can Body Cleaning → Capping → Can Collecting

Soonfer Machinery can provide the relevant equipment configuration and technical support according to the customer's actual packaging requirements.

For the weighing type powder filling machine, the two screw filling system provides a main filling stage and a fine filling stage. The large screw fills most of the target weight, while the small screw completes the remaining amount based on weighing feedback.

For product protection, the vacuum nitrogen flushing and sealing machine can reduce the oxygen content inside the can before sealing.

For can cleanliness, the line can include UV sterilization before filling and can body cleaning after sealing.

The final equipment configuration should always be confirmed according to the actual product, can sample, filling weight, production capacity and packaging requirements.

Frequently Asked Questions

1. What is a milk powder filling line?

A milk powder filling line is an automated packaging system that can include can unscrambling, UV sterilization, powder filling, vacuum nitrogen flushing, can sealing, can cleaning, capping and can collecting.

2. How does a weighing type powder filling machine work?

A weighing type powder filling machine checks the actual filling weight during the filling process. In a two stage system, the large screw performs the main filling and the small screw completes the remaining amount according to weighing feedback.

3. Does a dual screw powder filling machine fill two cans at the same time?

Yes. A dual head powder filling machine can be configured to fill two cans at the same time when higher production capacity is required. This configuration is suitable for applications where filling speed and output are the main priorities.

However, a dual head weighing type powder filling machine has a different working principle. The two screw heads work on the same can in two stages. The large screw performs the main filling, while the small screw completes the remaining amount according to weighing feedback. This provides higher filling accuracy and better weight consistency.

Therefore, the choice depends on your production requirements. If you need higher output, a dual head powder filling machine can be considered. If filling accuracy is the priority, a weighing type powder filling machine is a better choice.

4. Why is nitrogen flushing used for milk powder cans?

Nitrogen flushing can help reduce oxygen inside the can before sealing. This can help protect product quality when combined with suitable packaging and storage conditions.

5. Can the filling line handle different can sizes?

The ability to handle different can sizes depends on the machine configuration. Can diameter, height, shape and lid specifications should be confirmed before ordering.

6. How accurate is milk powder filling?

Filling accuracy depends on the powder characteristics, target filling weight, filling system and operating conditions. A weighing type filling system can use weighing feedback to control the final filling stage.

7. How can powder dust be removed from the can?

A can body cleaning machine can be installed after can sealing to remove powder and dust from the outside surface of the can.

8. What information should I provide when requesting a milk powder filling line?

You should provide the powder information, target filling weight, can dimensions, required production capacity, filling accuracy, nitrogen flushing requirements and desired level of automation.

9. Does the complete line include can sterilization?

The line can include a UV sterilization machine before powder filling. The specified machine combines air blowing, UV sterilization and ionized air cleaning.

10. Can Soonfer Machinery provide a complete milk powder filling line?

Yes. Soonfer Machinery can configure bottle and can filling lines according to the customer's product, container, filling and production requirements.

Conclusion

Choosing the right milk powder filling line requires more than comparing machine speed or price. The packaging system should be selected according to the powder characteristics, filling weight, filling accuracy, can size, production capacity, product protection requirements and desired level of automation.

A complete packaging line can integrate can unscrambling, UV sterilization, weighing type powder filling, vacuum nitrogen flushing and can sealing, can body cleaning, capping and can collecting.

For projects that require accurate filling, the two stage weighing system can provide main filling and fine filling on the same can. For products that require oxygen control, vacuum nitrogen flushing can be added before can sealing.

The best configuration is the one that matches your actual product and packaging requirements.

If you are planning a milk powder filling project, contact Soonfer Machinery with your powder information, can specifications, filling weight and required production capacity. Our team can help you evaluate a suitable filling line configuration for your factory.