Coarse and Fine Dosing

Efficiency and precision combined

In processes where both speed and precision are essential, a combination of coarse and fine dosing offers the ideal solution. This type of dosing system allows large quantities of material to be processed quickly, while the final dosing is finely tuned with high accuracy.

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Coarse and fine dosing with a Dosing ScrewA single dosing system for both large and small quantities

Many dosing processes require capacities that range from very small to very large. This is not easy to achieve. That’s why Klinkenberg has developed a system that combines coarse and fine dosing. The system dispenses the bulk of the materials at a high capacity and doses the remaining residue with precision. Our coarse and fine dosing systems are designed specifically for your sector, so you benefit from an extremely efficient setup.

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Dual Dosing Screw can be used independently
Designed to handle a wide capacity range
Simplicity
Designed to customer specifications

Applications of Coarse and Fine Dosing Systems

These systems are widely used in industries such as food, chemicals, and pharmaceuticals. They are especially suitable for processes that require fast handling with highly accurate final dosing. Typical use cases include filling packaging, ingredient mixing, or the controlled feeding of raw materials into a production process.

Advantages of a Dual Dosing System

Fast throughput with precise finishing

The combination of coarse and fine dosing makes it possible to process large amounts of material quickly without sacrificing accuracy.

Flexible control

Both screws can be controlled independently, allowing precise adaptation of the dosing process.

Wide applicability

Suitable for a variety of materials, from free-flowing powders to more difficult granulates and blends.

Hygienic design

Specially designed versions with removable screws simplify cleaning and maintenance, which is crucial in hygiene-sensitive sectors.

What is the difference between coarse and fine dosing?

Coarse and fine dosing are often combined in a dosing system with two separate screws. The coarse dosing screw is larger and provides fast delivery of the bulk material. The fine dosing screw is smaller and more precise, ensuring the exact amount is added with high accuracy.

When the target quantity is nearly reached, the coarse screw stops and the fine screw takes over to add the remaining amount precisely. This system is particularly suited for applications that require weight control or constant mixing ratios.

Dosing with Tubular or Trough Screw Conveyors

Some applications demand a wide capacity range, requiring control ratios of 1:20 or even more. Additionally, the center-to-center distance between inlet and outlet may be large.

Precise dosing through dual screw blade
Simple concept
Easy to maintain
Compact design

Combination of Coarse and Fine Dosing for Maximum Flexibility

Klinkenberg solved this by combining a coarse dosing screw with a fine dosing screw, allowing high dosing capacity and long inlet-to-outlet reach with the coarse screw. A fine dosing screw is integrated below the outlet side to precisely finish the dosing of the last few liters.

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Customer-Specific Dosing Screws

As many customers as there are solids to dose in customer-specific production processes. Each powder has its own characteristics relating to flow behavior, which are influenced by particle size, shape, electrostatic charge, humidity, particle size distribution, and more.

Taking these aspects into account—along with possible additional flow analyses—Klinkenberg is highly capable of designing the right dosing screw. In addition, it's crucial to maintain a stable powder flow from storage to ensure a consistent product feed to the dosing screw.

Applied Technologies We always select the right technique for your process

Klinkenberg technology includes the following variations:

Technology, finishing, and safety.

Would you like to learn more about the underlying or applied technologies for screw conveyors, such as the use of bearings, seals, safety, ATEX, or a desired finish?

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Variants

Dosing from uniform supply

Dosing from enlarged inlet

Dosing from Big Bag supply

Dosing from own storage

Documentation Exclusive with a personal design

Dosing Screws

Product brochure

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Bulk density table

Expressed in kg/m³ and lbs/ft³

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FAQ Direct answers to your questions

Quickly find answers to frequently asked questions about Coarse and Fine Dosing. Our FAQ section helps you make the right choice.

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The choice depends on the desired capacity, type of bulk material, and required speed. For free-flowing materials, a screw with a larger pitch is often used, while poorly flowing materials may require a custom screw geometry.

A frequency controller allows for stepless adjustment of the screw speed, enabling dynamic dosing control based on process needs. This enhances both flexibility and accuracy.

Yes, but in such cases, the dosing screws and trough should have special coatings or be made of materials like stainless steel or PTFE to minimize moisture absorption.

To prevent cross-contamination or unintentional mixing, dosing screws can be equipped with dividers or a fully separated dosing path per product. Screws can also be made quick-changeable or easy to clean.

The accuracy of a coarse and fine dosing system depends on the control system and material behavior. Advanced systems can achieve an accuracy of ±1.5~2% of the total dosing quantity.

A U-shaped trough is often used for better flow and easier cleaning, while a tubular housing is more suited for airtight and pressure-resistant applications or for materials that flow like water.

Yes, ATEX-certified versions are available, with motors, seals, and controls compliant with explosion safety guidelines.

These systems are suitable for a wide range of bulk materials, including powders, granules, and poorly flowing products.

Accuracy is achieved by operating the fine dosing screw at a lower speed and optimizing control via weighing or regulation technology.

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Coarse and fine dosing with a Dosing ScrewA single dosing system for both large and small quantities