Highly filled adhesives are perfectly processed using ViscoTreat-Inline

ViscoTec offers, with its ViscoTreat range, for example ViscoTreat-Inline, the optimum solution for batch filling and for continuous material processing. These are installed as a prior operation for dosing applications of low to high viscosity adhesives, thermal and solder pastes.

In order to ensure accurate dosing results of highly filled materials, their preparation before use is essential. It is often the case that fillers tend to sediment and agglomerate during longer storage and standstill times of the dosing system. As a result, exact application of the material is no longer possible. Dosing systems can become clogged and the wear of the system components is increased by the separation of the fillers from the binder. Furthermore, there are considerable deviations in the mechanical properties of the dosing material.

A further challenge in the dosing of liquids results from dissolved air in the material. Due to different local pressures within the dosing systems, unforeseen formation of gas bubbles can occur during the process. The reason for this is the dependence of the gas solubility in liquids on the partial pressures in the system. These gas bubbles have a negative effect on the repeatability of the dosing result and lead to increased waste ratio of the production

The ViscoTreat-Inline and ViscoTreat-Im materials processing and supply systems can successfully meet both obstacles in dosing technology. The processing plant, which at the same time serves as a buffer tank, allows constant stirring of the materials in order to counteract the sedimentation of the fillers. In addition, the dosing material are degassed sufficiently by means of an absolute pressure of up to 20 mbar in order to ensure process safety. The system is filled, for example, via a pail or barrel emptying. Alternatively, suction of the fluids and pastes by suction lance is possible. The material removal from the degassing vessel is carried out using ViscoTec’s tried and tested progressive cavity technology. A decisive advantage over alternative systems is the in-line degassing process, which allows simultaneous degassing of the medium and material removal under a constant process vacuum. This allows continuous production processes to be designed independently of the material supply.

For particularly sensitive and sedimentation-sensitive media, circulation is recommended – the degassing effect is increased and a homogeneous distribution of the fillers is guaranteed.

The various sizes of degassing systems allow the processing of unfilled as well as highly filled adhesives, even at the most varied viscosities of up to 1,000,000 mPas (depending on the dosing material). Critical process parameters are continuously monitored to ensure process reliability. This allows users to take advantage of a sophisticated solution for precise and reproducible dosing processes in fully automatic industrial processes.