A multi-component mixing head has three essential functions. First, to control the quantity to be dispensed exactly via the inbuilt valve technology; second to bring the material exactly to the right point through the dispensing nozzle. The third and most difficult function, however, is to mix the material components as well as possible just before application – homogenisation – and that using a predetermined, exact ratio.
For material systems with simple mixing ratios and wide processing tolerance a static mixer is adequate. Here the two material components must be pressed singly through a mixing tube in their correct quantities. The interior baffles of the mixing tube cause so much turbulence in the material stream that satisfactory mixing is achieved.
Many industrial applications, however, require highly complex mixing systems, which go beyond the capabilities of static mixers. Here dynamic mixing systems are needed in order to make up these tricky recipes reliably enough for industrial production.
Here fluid to highly viscous reaction substances can be used. Depending on the mixing head, discharge capacities of 0.1 to 100 g/s are possible. Continuous mixing ratios from 100:1 to 1:100 are available. And that with an extremely high accuracy in the dispensing quantity of approx. +/- 1%. These values can vary, depending on the mixing ratio, material viscosity and the adaptation of pumps, tubes and mixing elements. Characteristics of the materials such as reactivity and abrasiveness play a large role here.
Because of this, Sonderhoff offers you various mixing head designs, from the simple MK 20 with static mixing to our reference models from the MK 600 series. The latter are suited not only for our low-pressure technology for the application of mixed-cell foam, but also for FERMAPOR® K31 CC medium-pressure closed-cell foam.