When processing adhesives and sealants, as well as epoxy resin and silicone, continuous metering is necessary for certain applications. Metering systems with progressive cavity pumps are suitable for this task. This work is based on the volumetric metering principle, meaning that they enable precise metering of the material quantity.
The two new products include the Rotordis for processing single-component materials and Rotormix for metering and mixing multi-component materials.
Progressive cavity pumps work with no pulsation. Consisting of two components, the stator-rotor combination is part of the progressive cavity pump. This is a volumetric metering system that is sealed leak-free. It conveys the material continuously without any restrictions on volume, with low shear and gently in an axial direction. Progressive cavity pumps are therefore suitable for processing filled and abrasive materials. Rotordis and Rotormix are each available in four different nominal sizes: 0.01, 0.05, 0.15 and 0.30 ml/U. Rotordis enables shot sizes from 0.002 ml (2 μl) to be processed at a discharge rate of 0.13–45 ml/min, while Rotormix enables shot sizes from 0.006 ml (6 μl) to be processed at a discharge rate of 0.26–90 ml/min. In both cases, this is dependent on the viscosity and, in the case of Rotormix, also on the mixing ratio. Metering precision is ± 1 per cent.
With Rotordis and Rotormix, materials with different viscosities can be processed, ranging from water-thin to highly viscous or pasty. Depending on the viscosity, cartridges, pressure tanks or barrel pumps can be used. With both systems, application is generally carried out directly from the metering system onto the component by means of a nozzle or mixing tube. A DC drive enables dynamic metering and a controllable back suction effect. This ensures a clean thread break. A specially developed electronic metering control unit ensures optimal adaptation of all application-specific parameters. In addition, straightforward integration into automated production processes is enabled thanks to a standardised interface.
