Reduced volume: huge potential for a more efficient process chain

Advantages of VACUPRESS

In process engineering, processors of bulk solids are constantly confronted with the challenges of high volumes. The product-friendly deaeration and compaction of fine, free-flowing bulk solids with Grenzebach’s VACUPRESS opens up new possibilities for optimization:

With possible volume reductions of up to 75%, and a simultaneous increase in bulk density, the VACUPRESS creates the optimal starting point for your transport and storage processes. Specifically, not only can the space required for storage be significantly minimized, but a higher quantity can be transported. This added value directly opens up new cost advantages for you as a user.

High levels of air entrapment, which previously caused bulk solids to flow like water and generated large amounts of dust, can be bypassed in the future with the unique deaeration and compaction principle characterizing the VACUPRESS. Benefit from optimized handling properties that enable faster, dust-free dosing and packaging processes.



VACUPRESS units sold means our experts can draw on a wealth of project experience. Combining this experience with our in-depth process engineering knowhow, we develop the efficient solution for you!

Perfectly integrated into your process environment

The VACUPRESS powder compactor from Grenzebach shows its strengths wherever an increase in bulk density and a reduction in the volume of fine powders is required, for example for packaging, storage or further processing. Thanks to its small size and light weight, the VACUPRESS can be integrated into your existing process chain extremely economically and flexibly.

Thus, the VACUPRESS can be used upstream of the following process stations:

  • Packing equipment
  • Silos
  • Dosing units
  • Granulators
  • Pelleting presses
  • Briquetting presses

For a wide range of bulk materials

Possible applications of the VACUPRESS

The VACUPRESS can be used to compact all types of bulk solids. Ideally, they should have a particle size of less than 40 µm and an initial bulk density of less than 750 g/l. Especially significant volume reductions are achieved with fine-grained bulk solids and powders. We present some selected examples to show where the powder compactor is used today.

If we haven’t mentioned the bulk material you are working with, please don’t hesitate to contact us! Thanks to a wide range of filter media and configuration options, the VACUPRESS can be individually adjusted and optimally adapted to the material to be deaerated. You get a solution that exactly meets your needs!

Volume reduction of Silica


Silica is most commonly used as a filler for plastics and sealants, but it is also a component of paints, coatings and adhesives. Over a wide range of applications, the VACUPRESS® offers the following volume and bulk density optimizations:


Reference value uncompacted: 30 g/dm3

Reference value compacted: 110 g/dm3

Bulk density increase: approx. 267%

Volume reduction: approx. 73%


Compaction_Carbon Black

Carbon black

Industrial carbon black is produced as a base material and is used as a filler in the rubber industry or in the production of car tires. Color carbon black is also used as a black pigment in the production of printing inks or for coloring plastics. The following volume optimizations can be achieved here:


Reference value uncompressed: 22 g/dm3

Reference value compacted: 85 g/dm3

Bulk density increase: approx. 286%

Volume reduction: approx. 74%

Weight and volume optimizations of aluminium hydroxide

Aluminum hydroxide

Aluminum hydroxide is the world’s most important mineral flame retardant. It is used to prevent fire from breaking out or to inhibit its spread. When used in your process chain, the VACUPRESS offers you the following weight and volume optimizations:


Reference value uncompacted: 196 g/dm3

Reference value compacted: 470 g/dm3

Bulk density increase: approx. 140%

Volume reduction: approx. 58%


Compaction of Magnesiumhydroxid


Today, magnesium hydroxide is used in the food industry as well as in the medical sector. It serves as a flame retardant in plastics, an additive in detergents and a flocculant in wastewater treatment. The VACUPRESS achieves the following volume optimizations here:


Reference value uncompressed: 260 g/dm3

Reference value compacted: 650 g/dm3

Bulk density increase: approx. 150%

Volume reduction: approx. 60%


Compaction Zinc oxide

Zinc oxide

Zinc oxide is a chemical compound of zinc and oxygen. Today, it mainly serves as a pigment, although it is also used for light-emitting diodes and solar cells. Zinc oxide powder is a common additive in thermal conductive pastes. In this context, the VACUPRESS offers the following potential for compaction:


Reference value uncompacted: 425 g/dm3

Reference value compacted: 980 g/dm3

Bulk density increase: approx. 131%

Volume reduction: approx. 57%

Compaction of Talkum


Talc is used to impart water-repellent qualities to fabrics. In addition, it is a filler in the industrial production of paper, pulp, paints and coatings. Talcum powder is often used in the cosmetics industry. The VACUPRESS offers the following weight and volume optimizations for talc:


Reference value uncompacted: 210 g/dm3

Reference value compacted: 560 g/dm3

Bulk density increase: approx. 167%

Volume reduction: approx. 63%

Compaction of Phosphat


In the food sector, phosphates are used as preservatives, acidifiers or release agents. Today, the largest quantities are processed into fertilizers. Other products are flame retardants or corrosion inhibitors. For this purpose, the VACUPRESS offers the following compaction potential:


Reference value uncompacted: 241 g/dm3

Reference value compacted: 410 g/dm3

Bulk density increase: approx. 70%

Volume reduction: approx. 41%

VACUPRESS - Product-friendly compaction with low pressing forces

Functional principle

Used as an upstream powder deaerator, Grenzebach’s VACUPRESS extracts the air from the spaces between fine-grained bulk materials and powders. The greatest advantage here, compared to other systems, is the extremely low pressing force applied during compaction. This means that your products always retain their high quality. Even without applying large shear forces, your bulk materials can be returned to their original fine-powdered state at any time, for example by pneumatic conveying – without negative quality effects on downstream process steps. To see how the VACUPRESS works in detail and how you can benefit from it, check out in this video here

Process parameters of the VACUPRESS at a glance:

  • Throughput capacity from 30 up to 10,000 kg/h
  • Volume reduction up to 75%
  • Product temperatures up to 100°C
  • Particle size max. 40 µm
  • Initial bulk density max. 750 g/m³
  • ATEX-compliant available
Feasibility Test for compacting fine-grained bulk solids

Material analyses and trials at the Grenzebach Technical Center

With the analysis of raw materials and process engineering feasibility tests, Grenzebach creates a secure basis for your investment at an early stage. To this end, we analyze the material properties of your bulk materials in our own construction materials laboratory in Bad Hersfeld. The knowledge we gain in this way is directly incorporated into the development of the solution. Thanks to the wide range of test facilities in our technical center, we can move directly into practical testing with your bulk materials. We are also available to carry out larger tests at your site with our various kinds of rental equipment. Through specific tests with your starting material, we can determine in advance what kind of volume reduction you can achieve.

Further process technology solutions

Vibration tube mill: Grinding medium-hard and hard products

Grenzebach’s vibrating tube mills are the solution for grinding medium-hard to hard, abrasive products. For example, they can grind slags, ashes or fireclay and operate according to the vibromill principle. In this process, Grenzebach’s vibration tube mill achieves consistently high throughput rates with low energy consumption.

Jet Airstream Sifter: Separating fine, medium and coarse material

With the Grenzebach Jet Airstream Sifter, powders from all areas of solids processing technology can be separated into three fractions – fine, medium and coarse material – in just one step. The Jet Airstream Sifter is suitable for sifting bulk materials and for separating fines without spattering.


Your contact person: Philip Wagner

Do you have questions about the functions of the VACUPRESS? Would you like to discuss a special use case? Feel free to contact us. Grenzebach’s experts are always at your disposal.

Philip Wagner Grenzebach