SEG insulating varnishes have four different impregnation techniques used depending on the processing equipment, the type, the quantity of parts to be treated, and the desired result.
- This process is used for unit impregnation. It requires little material, hence its appeal.
The conditions for a good impregnation with this process are:
- quenched at room temperature.
- in certain cases, in order to promote the penetration of the varnish into the core of the winding, a preliminary preheating of the parts to a temperature of 50 ° C maximum is recommended.
- drainage proportional to the mass of the impregnated material and to the ventilation of the installation.
- temperature rise from ambient to the recommended temperature.
- bearing for solvent evaporation.
- temperature rise and polymerization.
Vacuum and pressure in autoclave
This version, more technical than the previous ones, is used in cases where penetration to the heart of difficult parts is necessary:
- dehydration at 130 ° C.
- slow admission of varnish by partial vacuum to avoid bubbling effects.
- pressurization (from 1 to 3 bars).
- gradual rise in temperature with strong ventilation.
- rise to the recommended temperature *.
* refer to the documentation for the chosen insulating varnish.