How does a container mixer compare with a permanently installed vertical mixer in terms of investment and operating costs?
A container mixer (IBC blender) is often economically advantageous where product variety is high and formulations change frequently, because cleaning and setting up largely take place offline and downtimes at the mixing station fall considerably. Permanently installed vertical mixers are frequently more favourable where there are few formulations and large, recurring batches, since the investment is spread over high volumes and operation can be very efficient with a constant product flow.
Investment costs
Container mixers are usually more expensive to purchase than a single stationary mixer, but they reduce the need for permanently installed infrastructure such as complex pipework, large platforms, additional mixing rooms or extensive cleaning systems. The concept is particularly attractive where one mixing station is to serve several containers, products and batch sizes flexibly. For smaller operations or start-ups, a container mixer can also be appealing because it can initially be operated and validated without a high degree of automation.
Permanently installed vertical mixers often have a lower basic price for the machine itself, but they require additional peripherals (conveying technology, extraction, CIP systems, explosion protection, structural modifications). As a result, the turnkey plant as a whole can end up more expensive despite the favourably priced individual machine.
Operating costs
Container mixers reduce operating costs above all through rapid product changes, less cleaning and validation effort at the mixing station and a lower risk of cross-contamination, since the main cleaning is carried out on the container. Set against this are the additional effort for transport, storage and internal container logistics as well as the energy needed to move whole vessels.
Permanently installed vertical mixers score where throughput is high, automation is extensive and specific costs per tonne are low, provided long runs are produced with the same product. Longer cleaning and drying times and the complete plant shutdown during product changes count against them.
Economic assessment
As a rule of thumb: high product variance, frequent batch changes and strict hygiene or contamination requirements argue for the container mixer. Low variance, large lot sizes and (quasi-)continuous operation argue for the permanently installed vertical mixer.
For a sound evaluation, floor space, degree of automation, cleaning effort, quality costs, intralogistics and the planned OEE (overall equipment effectiveness) of the mixing station should be considered alongside CAPEX and OPEX.
Container mixer or permanently installed vertical mixer? How amixon® compares investment and operation
Equally good mixing quality in line with the ideal random distribution, but different logistics
Both amixon® concepts deliver the technically ideal random mixture – the decision is therefore made on production logistics rather than on mixing quality. The COM container mixer (100–4,000 litres) uses the vessel as the mixing chamber, so no transfer is required. The container serves at the same time as a dosing, transport and holding vessel. Permanently installed vertical mixers (VM, SpherHelics®, conical mixer AM, HM, 100 to 50,000 litres in 100-litre increments) maximise batch size and throughput per unit of floor space.
Where the COM wins economically
Where formulations and products change frequently, weighing, mixing and filling are decoupled spatially: while one area is being cleaned or set up, the others continue to produce. Mixing-related downtimes shrink as a result, and product-dedicated Mixtainer® units minimise cross-contamination risks (relevant where allergens are involved). A Washtainer® automates the cleaning of the tools. On the investment side the system grows modularly: further containers are purchased rather than further mixers.
Where the classic batch mixer wins economically
With large, consistent batches and high utilisation, direct charging and discharge without container handling is the obvious choice. Batch sizes far beyond 4,000 litres are possible. ComDisc® residual discharge reaches 99.997 % and better and DosiFlap® direct filling is likewise available. Fill-level-independent mixing quality (10–100 %) gives the fixed mixer formulation flexibility as well.
Operating costs are low in both cases
Low-speed operation (minimal energy input), a mixing tool mounted at the top only (few wear parts), longevity (many amixon® machines have been in daily use for over 30 years) and lifelong spare parts service apply to both designs.
A sound basis for the decision
amixon® sets both scenarios against each other using the operator's real batch spectrums, changeover frequencies and cleaning regimes, and verifies mixing and changeover times in the pilot plant with the original product before the investment is made.
Hygienic design as the constructional basis
All the properties described rest on the amixon® hygienic design: mixing chamber and mixing tool are welded free of crevices and ground smooth, and the mixing tool is mounted at the top only – the contamination-critical lower shaft passage is eliminated. Large Clever-Cut® inspection doors with permanently dead-space-free OmgaSeal® seals provide ergonomic access to all product-contact surfaces. Dead-space-free discharge devices and integrated washing lances permit validatable dry and wet cleaning in accordance with the EHEDG guidelines, the FDA hygiene guidelines and the 3-A Sanitary Standards.
Run reproducibly, documented without gaps
The mixing programmes – that is, the recipes with mixing times, rotational frequencies, dosing and temperature profiles – are stored in the PLC and run identically for every batch. Integration into the operator's ERP system is provided for. A barcode scanner can be integrated for real-time documentation. Recipe, batch and process parameters thus remain linked without gaps – the basis for batch traceability, OEE evaluation and validations in regulated environments.