FAQ – Frequently Asked Questions

Why does AVA supply both horizontal and vertical mixing and drying solutions?

Only by offering both systems from a single source can we provide solutions that best meet our customers’ application needs. We do not sell a particular system; instead, we are in the comfortable position of being able to offer the process and system ideally suited to each individual project.

What distinguishes AVA from its competitors?

From the outset, we have made it our goal to build machines that are optimally tailored to our customers’ applications. In order to live up to this claim, it is important for us to listen carefully and take a close look at the details during every project phase. Our customers’ challenges inspire us to find solutions that go above and beyond standard engineering answers. Our process engineering solutions deliver more than just mixing and drying.

Can I also run test series at AVA?

AVA has a fully equipped demo center which allows for running test series on horizontal and vertical mixers and drying mixers, reactors, and evaporators.

An experienced team of process engineers supports the testing and helps to optimize the process together with you. All AVA test machines are mobile versions, so you can test them at your site on request.

Is AVA an international player?

AVA quality ‘Made in Germany’ is in operation in many countries around the globe. You can find our machines in a cocoa processing plant in the Himalayas as well as in a diamond mine in South Africa or a snack factory in Vietnam.

Does AVA offer to tailor machines to meet existing spatial conditions and constraints?

Of course, we align our installation sizes to your building conditions and adapt them in all respects as needed.

AVA mixing elements versus plowshare shovels? What are the differences?

For a very long time, the plowshare was the unquestioned standard in mixing technology. AVA mixing elements, however, deliver the following proven advantages:

  • Shorter mixing times
  • Reduced mixing shaft abrasion due to lower rotation speeds
  • Mixing geometry is much easier to customize to product requirements
  • Complete residual discharge as the AVA mixing elements can be adjusted accordingly near the outlet (not possible with plowshare blades)
  • Longer service life of mixing elements
  • Inexpensive stocking of spare parts, because AVA mixing elements are significantly cheaper than plowshare blades

AVA mixing elements provide a more efficient solution in every respect!

AVA horizontal mixer versus twin shaft mixer?

Twin shaft mixers are frequently being replaced by AVA horizontal mixers in the power plant industry. There is a good reason for this.

  • AVA horizontal mixers achieve optimum homogeneity of the finished product thanks to very thorough backmixing and dosing variation compensation.
  • No blocking occurs in AVA horizontal mixers (in twin shaft mixers, the zones between shafts and at the outlet are prone to issues).
  • Lower servicing costs with AVA horizontal mixers as they have only two bearings and two mixing shaft seals – compared to twice the number of rotating parts, seals, and bearings in the twin shaft mixer.
  • Lower storage costs because far less agitators are needed for an optimum mixing result.
  • AVA mixers cover the entire surface of the mixing drum and therefore have a self-cleaning effect. In twin shaft mixers, the inner drum wall must be cleaned manually, as this self-cleaning effect is missing.
  • The flexible AVA mixers can be operated at fill levels between 20% and 70%. Twin shaft mixer are operated at an ever-constant fill level of 50%.
  • No abrasion-prone places in the AVA mixing drum. In twin shaft mixers, the composite body of the two drums is subject to wear.
  • Twin shaft mixers are highly susceptible to foreign bodies, compared to AVA horizontal mixers.
AVA conical mixers versus double cone?

In the field of vertical conical mixers, there are numerous systems on the market. One of these is the double cone. However, the AVA system offers numerous advantages over this.

  • Double cone feeding and emptying connections must be separated before the process starts. This cannot be automated, but requires human intervention (additional expenditure). With AVA conical mixers, all connections remain in position.
  • For each double cone, two bearings and two seals must be maintained or changed. The AVA conical mixers have just one, which is maintenance free, even in the lip ring seal version.
  • In the drying mixer version, the double cone fill level is substantially less than in the AVA cone.
  • The double cone has no agitator that projects into the product chamber. This means that the potential heating/drying capacity is substantially less than in the AVA cone.
  • The flatter cone angle of the double cone makes residual discharge far more difficult than in the AVA cone.
  • Product contamination can occur far more easily in the double cone, because the two seals and bearings come into contact with the product. With the AVA cone, this is avoided as sealing and storage are located outside the product chamber.
  • No in-process samples can be taken with the double cone.
  • Product progress monitoring through a sight glass is not possible with the double cone.
  • If CIP nozzles are installed, with the double cone there is the risk of clogging during operation. The rinsing lines must all be manually reconnected to the double cone end after the process has completed.