Reliable Mixing and Dosing

Experience and Precision in Every Machine Component

With our DM 50x series equipment portfolio, we offer automation solutions for the mixing and dosing of 2-component reactive materials – especially polyurethanes, silicones, and epoxy systems.

For this, the dosing components must be prepared, i.e., stirred in the tank and loaded with air, and then conveyed to the mixing head. In the mixing head, the material components are then mixed dynamically, and the liquid sealant system is dosed in precise quantities.

Each of the process steps involved has its own specific requirements that shows how good a machine it is. Our experience acquired over decades of machine development makes the difference and ensures the reliability of our mixing & dosing machines.

Material Preparation Begins with Stirring

Depending on the material system, it may be necessary to load the A component with air, for example in order to obtain a fine-cell foam, or – just the opposite – to degas it for bubble-free clear potting. The agitator therefore has the function of not only counteracting sedimentation, but also of ensuring uniform air loading or degassing and temperature distribution. For an optimal degassing process there is also the option of thin-layer degassing. This takes place in the material pressure tanks.

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Recirculation for a Constant Flow of Materials

No matter how precise a pump is: It is a real challenge to achieve accurate dosing – especially in the case of long hose routes where the material always comes to a standstill after dosing and must be set in motion again for the next dosing step.

An exact application rate is particularly difficult to achieve when small quantities are to be dosed and the valve opening times are correspondingly short. For this reason, the material flowing is kept at a consistent rate with our recirculation principle and the pressure in the system at a constant level as a result. This is ensured by the precision gear pumps installed in the dosing machine cabinet.

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Dynamic Mixing Systems for High Requirements

Dynamic mixing heads are used for our low-pressure mixing and dosing systems for the application of sealing foams, adhesives and potting compounds based on polyurethane or silicone. They are required in order to reliably process highly complex, liquid to highly viscous polymer reaction materials that are required for many industrial applications. The performance of these dynamic mixing heads exceeds the capabilities of static mixers. Depending on the mixing head, discharge rates from 0.05 to 100 g/s are possible. The mixing ratio is continuously adjustable from 100:1 to 1:100.

Furthermore, this is all possible with an extremely high dosing accuracy of ±1 % of the quantity to be applied. These values can vary depending on the mixing ratios, material viscosity, and the adaptation of pumps, hoses and mixing elements. Properties such as reactivity and abrasiveness of the material also play a major role here.

The greatest possible level of material homogeneity after mixing 2-component material systems with different viscosities – even in the case of demanding, asymmetrical mixing ratios – can only be achieved with dynamic mixing. This is performed by our MK 800 mixing heads .

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Accurate Reﬁlling for a Continuous Supply of Material

When used in fully automated manufacturing processes, automatic refilling stations ensure material-specific preparation, homogeneous consistency and a continuous supply of materials to the component containers of the mixing and dosing system – without exposure or contamination of the products to be filled. Partially equipped with an automatic lifting device for more operating convenience and greater occupational and system safety. Production interruptions are therefore a thing of the past.

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Optional Equipment Used to Increase Process and Dosing Accuracy

Additional equipment options can be ordered for the DM 50x dosing machine series which further increase the process and dosing accuracy, e. g.:

Part recognition sensor
AIR-CLEAN, pneumatic nozzle cleaning device
NOZZLE-CONTROL dosing nozzle measurement unit
WEIGHT-CONTROL dosing weight control
HOT-CLEANER UNIT for cleaning the mixing elements with PU hot cleaner.
LBM 3 air loading measuring and control unit
PELTIER mixing head cooling system

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