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What Materials Are Suitable for External Vacuum Sealing Machines?
Discover which materials are suitable for an external vacuum sealing machine, including plastic pellets, chemical granules, fertilizers and industrial powders. Learn how to choose the right vacuum sealing solution for your packaging needs.
Choosing a vacuum sealing machine is not only about the equipment itself. The material being packaged plays an important role in determining whether the solution will achieve stable packaging results.
An external vacuum sealing machine is widely used in industrial packaging because it can handle different bag sizes, support flexible production processes, and integrate with automatic packaging systems. If you're comparing it with a chamber vacuum system, read our guide on External Vacuum Sealer vs Chamber Vacuum Sealer: Differences, Pros & Cons, and How to Choose before selecting your equipment.
However, not every product requires the same vacuum packaging method. Materials such as plastic pellets, chemical granules, fertilizers, and other bulk materials often benefit from external vacuum sealing. On the other hand, some ultra-fine powders or products with extremely strict vacuum requirements may require specialized vacuum or degassing solutions. Understanding the characteristics of your material before selecting equipment can help avoid unnecessary investment and improve packaging performance.
This guide explains which materials are suitable for external vacuum sealers, what factors should be considered, and when another packaging solution may be more appropriate.
How Does an External Vacuum Sealing Machine Work?
An external vacuum sealer removes air from the bag through a suction nozzle placed at the opening of the bag.
Unlike a chamber vacuum sealer, the entire package does not need to be placed inside a vacuum chamber. This allows the machine to handle larger bags and different packaging formats.
The basic process includes:
- Bag positioning
- Vacuum extraction through the nozzle
- Heat sealing of the bag opening
- Removal of the finished package
Because of this working principle, external vacuum sealing machines are especially suitable for:
- Large industrial bags
- Open-mouth bags
- PE bags
- Woven bags
- Composite film bags
1. Plastic Pellets and Resin Granules
One of the Most Common Applications for External Vacuum Sealing Machines
Plastic pellets are among the most widely used materials for industrial vacuum packaging. They are commonly supplied in large quantities and transported over long distances, making packaging stability an important consideration.
Typical materials include:
- PE pellets
- PP pellets
- ABS resin
- PVC granules
- Engineering plastics
- Masterbatch
During conventional bag packaging, air trapped inside the bag can cause several problems:
- Bulky package shape
- Unstable stacking during transportation
- Increased storage space requirements
- Poor appearance of finished bags
For plastic pellet manufacturers, the purpose of vacuum sealing is usually not to achieve the highest possible vacuum level, but to remove excess air and create a more compact and stable package.
An external vacuum sealing machine is often suitable for this application because plastic pellets usually have good flowability and relatively uniform particle sizes. The machine can work with common industrial packaging formats, including PE bags, composite bags, and woven bags.
For example, manufacturers packaging 25kg or 40kg bags of resin pellets may use an external vacuum sealer to improve bag stability during warehouse storage and international transportation.
When selecting equipment for plastic pellets, manufacturers should consider:
- Pellet size and shape
- Bag material and thickness
- Required packaging speed
- Whether automatic filling and conveying systems are required
2. Chemical Granules
Improving Packaging Stability for Industrial Chemicals
Chemical granules are another important application area for external vacuum sealing technology.
Typical materials include:
- Chemical additives
- Catalyst particles
- Plastic additives
- Industrial compounds
- Granular raw materials
Many chemical materials require stable packaging because they may be affected by:
- Moisture exposure
- Long transportation cycles
- Storage environment changes
- Contamination risks
During transportation, air inside the bag may create unnecessary expansion and reduce stacking stability. Vacuum sealing helps remove part of the trapped air and improves the overall package structure.
For chemical granule manufacturers, external vacuum sealing machines provide a practical solution because many granular materials have predictable flow characteristics and can be easily filled into open-mouth bags before sealing.
However, chemical materials vary significantly. Some products may generate dust during filling, while others may require corrosion-resistant contact materials.
Before selecting an external vacuum sealer, manufacturers should evaluate:
- Material dust level
- Chemical properties
- Required sealing environment
- Bag structure
For dusty chemical granules, additional solutions such as dust collection systems or customized sealing configurations may be required.
3. Fertilizer Granules
Vacuum Packaging for Storage and Transportation Efficiency
Fertilizer products are commonly packaged in medium and large industrial bags, making them suitable for external vacuum sealing applications.
Common materials include:
- NPK fertilizer
- Urea fertilizer
- Compound fertilizer
- Potassium fertilizer
- Organic fertilizer granules
Fertilizer manufacturers often face packaging challenges such as:
- High transportation volume
- Bag deformation after filling
- Moisture sensitivity
- Long storage periods
By removing excess air from the package, vacuum sealing can help create a more compact bag shape and improve stacking performance.
For fertilizer applications, the packaging solution depends heavily on bag size and production requirements.
For example:
- 25kg–50kg fertilizer bags may focus on packaging speed and sealing consistency.
- 100kg–1000kg bulk bags require stronger bag handling systems and customized vacuum sealing solutions.
When selecting an external vacuum sealing machine for fertilizers, manufacturers should consider:
- Fertilizer particle size
- Dust generation during filling
- Bag material
- Required automation level
4. Mineral Materials and Industrial Granules
Suitable for Bulk Industrial Packaging Applications
Many mineral and industrial materials are packaged in large quantities and require reliable sealing performance.
Typical applications include:
- Industrial salt
- Silica materials
- Activated carbon
- Filter media
- Mineral granules
- Construction additives
These materials are usually not packaged because of extremely high vacuum requirements. Instead, the main goals are:
- Stable bag shape
- Reduced air volume
- Better transportation efficiency
- Reliable sealing performance
External vacuum sealing machines are often suitable because they can handle different industrial bag sizes and integrate with existing filling systems.
For mineral materials, the equipment selection should focus on:
- Material abrasiveness
- Particle size distribution
- Dust generation
- Bag strength
Some abrasive materials may require special consideration for machine components that contact the material.
5. Food Ingredients and Agricultural Granules
When Clean and Stable Packaging Is Required
Certain dry food ingredients and agricultural materials can also benefit from external vacuum sealing.
Examples include:
- Seeds
- Grain products
- Dried agricultural materials
- Food processing ingredients
For these applications, vacuum packaging is commonly used to:
- Reduce oxygen exposure
- Improve storage stability
- Maintain product quality
However, food-related applications usually have stricter requirements compared with general industrial packaging.
Manufacturers should consider:
- Food-grade contact materials
- Cleaning requirements
- Packaging regulations
- Production environment
The machine configuration may need to be adapted depending on whether the application is food production or industrial material packaging.
6. Powder Materials (With Application Limitations)
Suitable for Some Powders, But Not All
Powder packaging requires more careful evaluation because different powders behave very differently during vacuum extraction.
Examples include:
- Chemical powders
- Mineral powders
- Industrial additives
Some standard powders with good flowability can be packaged using external vacuum sealing equipment.
However, ultra-fine powders may create challenges because:
- Fine particles can be drawn toward the vacuum system
- Air permeability is different
- Higher vacuum control may be required
For materials such as battery-grade powders, pharmaceutical powders, or extremely fine functional materials, manufacturers usually need specialized degassing or controlled vacuum packaging solutions.
Therefore, before selecting equipment, powder characteristics should be evaluated rather than relying only on product names.
Materials That May Require Other Vacuum Solutions
Although external vacuum sealing machines are widely used, they are not suitable for every application. Very fine powders can behave differently during vacuum extraction. In these applications, a chamber vacuum sealer or a vacuum system with degassing technology can provide more stable vacuum performance and reduce the risk of material loss.
Ultra-Fine Powders
Very fine powders can behave differently during vacuum extraction.
Examples:
- Battery powders
- Pharmaceutical powders
- Nano materials
These applications may require:
- Degassing systems
- Controlled vacuum processes
- Special powder handling equipment
- Dust level
- Moisture sensitivity
- Flowability
Key Factors When Choosing an External Vacuum Sealing Machine
Before selecting equipment, manufacturers should evaluate:
1. Material Characteristics
Consider:
- Particle size
- Dust level
- Moisture sensitivity
- Flowability
2. Bag Type
Common bag types include:
- PE bags
- PP woven bags
- Kraft paper bags with inner PE film
- Composite bags
Different bags may require different sealing parameters.
3. Packaging Weight
The solution can vary significantly between:
- Small bags (1–50kg)
- Large bags (100–1000kg)
Large bags usually require different handling systems and stronger mechanical structures.
4. Automation Requirements
For factories with higher production capacity, external vacuum sealing machines can be integrated with:
- Automatic bag filling machines
- Weighing systems
- Conveyors
- Robotic palletizing systems
This helps create a complete automated packaging line.
Conclusion
An external vacuum sealing machine is a practical solution for many industrial materials, especially plastic pellets, chemical granules, fertilizers, minerals, and other bulk products.
The key is not choosing the machine with the highest vacuum level, but selecting equipment that matches:
- Material characteristics
- Bag size
- Packaging requirements
- Production process
- Automation goals
For manufacturers packaging industrial materials, external vacuum sealing technology provides flexibility, reliability, and efficient integration with modern packaging systems.
However, materials requiring extremely high vacuum control, such as some ultra-fine powders, may need specialized solutions.
Understanding your product first is the most important step in selecting the right vacuum sealing equipment.
FAQ
1. Can an external vacuum sealer package plastic pellets?
Yes. Plastic pellets are one of the most common applications. External vacuum sealers are widely used for PE pellets, PP pellets, resin, and masterbatch packaging.
2. Can an external vacuum sealing machine handle large bags?
Yes. External vacuum sealing solutions can be designed for larger industrial bags, including bulk bags depending on the machine configuration.
3. Is an external vacuum sealer suitable for powder packaging?
It depends on the powder characteristics. Standard industrial powders may be suitable, but ultra-fine powders requiring high vacuum control may need specialized solutions.
4. What industries use external vacuum sealing machines?
Common industries include:
- Plastics
- Chemicals
- Fertilizers
- Minerals
- Food ingredients
- Industrial materials
5. How do I choose the right vacuum sealing machine?
The selection should consider:
- Material type
- Bag size
- Production speed
- Vacuum requirements
- Automation level
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