The sachet packaging machine automates the entire packaging process—from bag forming, filling, and sealing to cutting individual sachets—to produce single-dose packaged products. Equipped with suitable dosing mechanisms, the equipment can handle a wide range of materials, including free-flowing liquids, viscous pastes, fine powders, and coarse granules.
Different Types of Sachet Filling Machines
Sachet filling machines are generally classified according to the product being packaged and the filling method used.
The main categories include:
- Powder Sachet Filling Machine
- Liquid Sachet Filling Machine
- Paste Sachet Filling Machine
- Granule Sachet Filling Machine
- Multi-Lane Sachet Filling Machine
- Complete Sachet Packaging Line
The filling system is one of the most important differences between these machines.
1. Powder Sachet Filling Machine
A powder sachet filling machine is used to pack powdered products such as milk powder, coffee powder, spices, nutritional powders, and some chemical powders into small sachets.
An auger filling system is commonly used for powder filling. To dose fine materials into individual sachets, the equipment relies on a rotating screw—an auger setup that measures and dispenses powder unit by unit—though choosing the right system ultimately hinges on a web of physical factors (bulk density, moisture content, dusting tendency, and flowability) balanced against your target fill weight.
For powders with poor flowability, the equipment can be fitted with additional feeding or agitation devices to assist the flow of powder into the filling system.
SUNHAN Automatic High Speed Three Sides Seal Vertical Form Powder Small Sachet Auger Filling Sealing Packaging Machine is an ideal sachet filling machine for packaging powder.
- Measured by auger, it has high filling accuracy.
- Different sealing methods can be customized as needed.
2. Liquid Sachet Filling Machine
Liquid sachet machines are designed for products that can flow through a filling pump and nozzle.
Typical applications include:
- Water-based liquids
- Juice and beverages
- Sauces
- Syrups
- Oils
- Detergents
- Cosmetic liquids
- Liquid supplements
The filling system can vary according to the product. Piston pumps, magnetic pumps, peristaltic pumps, and other liquid dosing systems can be used in different machine configurations. For example, lists magnetic, peristaltic, gear, and piston pump configurations across its sachet packaging range.
The product's viscosity and foaming behavior are important when selecting the pump and nozzle. A thin liquid and a high-viscosity liquid may require different filling configurations.
To meet these packaging requirements, SUNHAN offers the SH-FS240LC VFFS Automatic Ceramic Pump Cosmetic Mouthwash Liquid Sachet Filling Sealing Packing Machine With Laser Coder, designed for packaging powder products.
- Ceramic pump for accurate dosing
- Servo-controlled film feeding
- Customizable sealing methods
- Optional laser coding
3. Paste Sachet Filling Machine
Paste sachet machines are designed for products with higher viscosity than conventional liquids.
Examples include:
- Honey
- Ketchup
- Mayonnaise
- Cosmetic creams
- Gels
- Thick sauces
- Toothpaste-like products
- Other viscous products
Piston pumps are commonly used to handle viscous materials because they employ a positive-displacement principle to dispense precise quantities of product. For particularly viscous materials, the equipment may also require the heating & mixing hopper, the feeding pump and etc.
So choosing a sachet filling machine for pastes, considering viscosity alone is insufficient. We also need to know whether the product contains particulates, requires heating and how well it flows into the filling system.
For handling paste products, choosing SH-FS240LS Automatic Piston Pump Vertical Form Serums Conditioner Liquid Paste Sachet Stick Filling Sealing Machine can help to improve packaging process.
- Piston pump for accurate liquid or paste filling
- Heating and mixing hopper available
- Customizable sealing methods
4. Granule Sachet Filling Machine
Granule sachet machines are designed for products consisting of small particles or granules.
Typical products include:
- Sugar
- Salt
- Coffee granules
- Seeds
- Seasoning granules
- Small food particles
- Chemical granules
Depending on your filling material, a volumetric cup filling machine, a weighing system, or another metering system suitable for the product may be used.
Before selecting a metering method, factors such as granule size, bulk density, flowability, and the required fill weight should be considered.
For example, a free-flowing sugar product and a fragile irregular-shaped product may require different feeding and dosing arrangements.
Among the available packaging solutions, the SH-FS250KQ Automatic Vertical VFFS Quantitative Granule Sachet Filling Sealing Packaging Machine With Date Coder is designed for packaging granule products.
- Measuring cup system for accurate granule filling
- Adjustable sealing temperature
- With high-sensitivity sensor
- Optional date coder
Can One Sachet Machine Fill Both Liquid and Paste?
Yes. Some sachet filling machines can be configured for both liquid and paste products.
This does not mean that one standard filling pump can handle every liquid and paste. Instead, the machine can be configured with a suitable filling system according to the product.
For example, manufacturers offer sachet systems described as liquid & paste machines, with pump configurations selected according to the product.
A machine for both liquid and paste products may use different pump configurations or interchangeable filling components.
For example:
- Liquid product → Magnetic pump / peristaltic pump / piston pump
- Viscous product → Piston pump / other product-matched positive-displacement pump
The correct configuration depends on the actual product rather than simply whether the product is called a “liquid” or “paste.”
What should be confirmed before ordering?
If you want one machine to handle both liquid and paste products, provide the manufacturer with: Product name, viscosity, filling volume, product temperature, whether the product contains particles, required filling accuracy, sachet dimensions, required production capacity.
Product testing is particularly useful when the two products have significantly different viscosities or filling behaviors.
For this type of application, SUNHAN provides the SH-FS220U Automatic Vertical Form Servo Small Sachet Bag Cosmetic Hair Mask Liquid Paste Filling Sealing Machine, which supports both liquid and paste filling in one machine.
- Filling controlled by piston and magnetic pumps
- Dual use for liquid & paste
- Optional date coder
How Does a Sachet Filling Machine Work?
Although the exact structure varies between machines, a typical sachet packaging process can be summarized as follows.
Step 1: Film Feeding
A roll of flexible packaging film is fed into the machine.
The film must be compatible with the machine's forming and heat-sealing system.
Step 2: Sachet Forming
The film is shaped according to the selected packaging format.
Depending on your packaging requirements, machine can be produced in formats such as back-seal, three-side seal, four-side seal, or stick packs.
Step 3: Product Filling
The selected dosing system delivers the required amount of product into the sachet.
The dosing system is selected according to the product:
Auger → powder
Volumetric cup or weighing → granules
Pump → liquid
Piston or other suitable pump → viscous products
Step 4: Heat Sealing
The sealing temperature is adjusted according to your packaging film.
Step 5: Cutting
Step 6: Discharge
Finished sachets are discharged from the machine and can be transported to downstream equipment if required.
How to Choose the Right Sachet Filling Machine?
1. Type of Product
First, determine which of the following categories the product falls into: liquid, viscous liquid, paste, powder, granules, or a product containing granules.
2. Characteristics of Product
For liquids and pastes, please provide information regarding viscosity, temperature, foaming characteristics, and particle content.
For powders, please provide information on bulk density, flowability, moisture content, and dustiness.
For granular materials, properties such as particle size, shape, density, flowability, and friability are critical, as they directly influence the feeding method and equipment configuration.
3. Filling Volume of Product
The filling volume should be defined before selecting the machine. The actual filling range depends on the selected dosing system and machine configuration.
4. Size of Sachet
The required sachet width and length affect the forming system, film width, filling volume, and machine configuration.
A supplier should receive the target sachet dimensions before recommending a machine.
5. Sealing Method
Common options include three-side seal, four-side seal, back seal and stick pack.
The specific choice depends on product characteristics, fill volume, aesthetic requirements, film structure, and intended use.
6. Determine Required Output
Production requirements should be expressed in terms of "bags per minute" or "bags per hour."
Actual performance must be evaluated based on the product, packaging film, sachet dimensions, fill quantity, and other operating conditions.
Sachet Filling Machine Line for Higher-Level Automation
For manufacturers with higher production requirements, a sachet filling machine can be connected with upstream and downstream equipment.
A complete packaging line may include:
Product Preparation → Feeding → Sachet Forming & Filling → Sealing → Cutting → Inspection → Counting → Cartoning → Case Packing → Palletizing
The exact configuration depends on the industry and production requirements.
For example, pharmaceutical sachet lines can combine sachet packaging machines with sachet transfer systems, cartoners, labeling equipment, case packing, and palletizing.
This approach can reduce manual handling between packaging stages and create a more automated production process.
For businesses looking for a suitable solution, the SH-FSL220 Full Electric Automatic Servo Gear Pump Paste Sachet Filling Sealing Flat Surface Labeling Production Packing Line can help automate sachet filling, sealing, and labeling.
- Integrates sachet packaging, coding and labeling
- Servo gear pump for precise filling
- Printing information can be edited on a computer
- Flat sachet surface labeling
- Full electric operation
FAQ About Sachet Filling Machines
1. Can one machine fill both liquid and paste?
Yes. Some machines can be configured for both liquid and paste filling by using suitable pump and filling components. The actual configuration should be determined according to the viscosity and other product characteristics.
2. What filling system is used for granules?
Volumetric cup fillers and weighing systems are common options for granules. The choice depends on particle size, flowability, density, and required dose.
3. What pump is used for liquid sachets?
Depending on the application, liquid sachet machines may use piston pumps, magnetic pumps, peristaltic pumps, gear pumps, or other suitable dosing systems.
4. What sachet formats are available?
Common formats include 3-side seal, 4-side seal, back seal, and stick pack. The available format depends on the machine configuration.
5. Does product viscosity affect the machine?
Yes. Viscosity can affect pump selection, filling speed, nozzle design, product feeding, and cleaning requirements. Therefore, viscous products should be evaluated before the final machine configuration is selected.
6. Can sachet machines be integrated into a complete production line?
Yes. Depending on the application, sachet machines can be connected to upstream product feeding systems and downstream counting, cartoning, case packing, and palletizing equipment.
7. What information should I provide when asking for a quotation?
Please provide product information about filling weight, sachet dimensions, packaging format, film material and product characteristics. Product samples and film samples may also be required for testing.
Conclusion
The best way to select a sachet filling machine is to match the dosing system, sachet format, film, and production capacity to the actual product and packaging requirements. When one machine needs to handle both liquids and pastes, the filling system should be specifically configured and tested for both products rather than assuming that a standard pump can handle every formulation. If you are looking for sachet filling machine, please click on the bottom right corner to chat with us or sent us emails via info@sunhanpack.com
