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Robust and precise mixing system for up to three components

With the EcoDose 3K, Dürr is growing its product family of paint mixing systems with a solution for three-component fluids based on the tried-and-tested two-component injection technology. The mixing system boasts a number of features including high precision, long service life, and smart functions.

Robust and precise mixing system for up to three components
The EcoDose 3K from Dürr mixes three-component fluids.

Like the proven EcoDose 2K, which is used by hundreds of customers worldwide, the new EcoDose 3K from Dürr boasts a long service life and ease of maintenance. The new mixing system is used wherever three components of a fluid need to be merged shortly before application. Three-component coating systems are popular in aviation, woodworking, and yacht and boat building.

Precise mixing thanks to injection technology

The EcoDose 3K is based on the same inline injection technology as Dürr’s established two-component mixing system. In an upgrade to the EcoDose 2K, a color changer, a measuring cell, and a mixer have additionally been integrated into the system. The controller has also been appropriately enhanced to enable it to meter, merge, and mix all three components fully automatically shortly before they are used. This is done by monitoring the continuous flow of the first component using a measuring cell. The other components to be injected are metered as appropriate to the desired mixing ratio by opening and closing valves. The metering quantity is also monitored using measuring cells to ensure the correct mixing ratio is maintained.

Particular precision is needed for the third component, which typically determines the viscosity. This is because only a very small amount of this agent is added, and it often has a very low viscosity. Dürr uses Coriolis measuring cells in the EcoDose 3K as the most efficient way of dealing with low viscosities. These are maintenance-free, offer high measurement accuracy, and provide additional measurement functions, for example for density and temperature. The EcoDose 3K meets the high precision requirements with proven Dürr valve technology that enables injections in particularly short cycles.

Robust valve technology for long service life

Despite the high clock frequency of 5 Hz, the lifetime of the Dürr valve technology is second to none: the valves from the first series, which Dürr launched three years ago, have now completed over 10 million switching cycles without any maintenance at all and are still in operation today.

In addition, the clever valve design ensures that fluids cannot get into the valve’s pilot air piston in normal operation, even in the event of minor leaks. This prevents undesired reactions with the moisture in the air. If maintenance is ever required, the valve can be quickly replaced by undoing four screws – which means that the system is ready to use again within just a few minutes.

Smart functions complement the EcoDose 3K

Dürr’s EcoDose 3K is complemented by a 7-inch color touchscreen display. Users quickly find their bearings, since operation is similar to Dürr’s other controller-based products. The standard delivery contents also include an Ethernet communication interface that can be integrated into the particular controller landscape. The mixing system also has smart functions to minimize both detergent consumption and fluid loss, and to significantly reduce the time required for rinsing and loading a new medium.

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