Potting in a vacuum – The process steps

The ideal potting process starts during development

Miniaturization and increasingly more complex components with several undercuts are challenging for absolute bubble-free potting. Even horizontally positioned, wide stretched component parts can trap rising air below them and prevent it from escaping. If, for example, coiled material is placed under such a surface as shown below, the remaining air caught between the wires cannot rise to the surface.

Moreover, many coils and gaps to be potted are so small that they can only be filled using the bubble-free vacuum potting process. It is therefore recommended
to take pourability for potting into account as early as during the component development stage.

Coil Potting

GLUDITEC Tests provide clarity here if necessary. If for various reasons this is not possible, potting in a vacuum always gives you peace of mind.

Once the decision has been made to use vacuum potting, the focus shifts to production. And here one thing is crucial: For completely bubble-free potting, the entire preparation, feeding and dispensing process must take place in a vacuum. After all, air bubbles are undesirable in more than just the finished potted component. They can cause a variety of problems even during potting – always at the expense of productivity. If the air bubbles reach the dispenser, they may cause errors in the quantity of potting material required and distort the mixing ratio. The consequences range from irregular production results to an increase in rejected components. The potting material is therefore already prepared in a vacuum. To prevent the degassing of micro-bubbles during vacuum potting, make sure that preparation takes place at a lower vacuum pressure than that used during the subsequent vacuum potting procedure (e. g. 5 mbar during preparation, 50 mbar during vacuum potting).

Vent holes

Horizontal workpiece surface with and without vent holes

Optimized arrangement of flat modules

Vertical arrangement compared to horizontal arrangement of workpiece surfaces

GLUDITEC Vacuum Mixing & Dispensing System

The meter-mixing module with advanced functions as auto-cleaning, liquid-level sensor, pipe, and tank heater, all play exceptionally important roles in simplifying the dispensing process.

The dispensing module with the three-axis desktop robot moving continuously and dispense in various types of the path as dot, line, arc, and circle. The whole dispensing cell is covered by a safe chamber which helps to dispense tasks perform continuously and more accurately with exceptional moving speed.

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