Practical tip: Perfect mixing depends on the materials

Perfect mixing depends on the materials

Practical tips (2)

Static mixing tubes guarantee homogeneous mixing of two-component materials using a helical mixing shaft.

The agitators are always adapted to the particular material to achieve optimum results

In vacuum potting, mixing 2C materials takes place directly in the mixing tube prior to application. The resin and hardener are homogeneously mixed. The static mixing tube made of synthetic material is an inexpensive and effective option. This type of tube contains several helical mixing panels placed one after the other. The 2C potting material flowing through the tube is fragmented a billion times, depending on the number of deflection surfaces present and is then merged again with a phase offset until uniform mixing and thus curing is guaranteed by the reaction of the resin and hardener. Static mixing tubes are inexpensive for a variety of reasons. For example, since it is possible to dispose of and replace a mixing tube with a new one after a shift change, laborious cleaning is not necessary. 

There is also no risk of cured residue in the mixing tube soiling the newly added potting material. This system is maintenance free and the mixing tubes are affordably priced.

The metering and dispensing system determines the productivity

Practical tips (3)

Multi-nozzle dispensing, superior dispensing accuracy through volumetric dispensing and low-maintenance, robust designs make today’s cuttingedge vacuum systems extremely effective.

The key criteria here are precise and reproducible dispensing quantities of components A and B of the 2C materials. It becomes inaccurate where the dispensing is affected by pressure, temperature or viscosity fluctuations. A volumetric metering principle with mechanically defined mix ratio and monitoring of quantities to be metered increases process reliability and guarantees consistently high quality. Particularly in the case of vacuum potting, the metering and dispensing system must be perfectly synchronized to the material preparation and potting process. A user-friendly metering and dispensing system should be designed in such a way that both components only come in contact after dispensing, for example in a static mixing tube. This prevents the resin and hardener from reacting in the metering head or failure in the complete metering and dispensing system. High output and short cycle times are achieved through multi-nozzle dispensing, i. e. with systems with up to twelve outlets. Controlled release from mixing tubes or direct nozzle controls for a flexible line design is possible. No-part no-fill requirements can easily be achieved this way.

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