What is varnish impregnation process?
Impregnation varnish: impregnation involves covering the winding with a varnish dissolved in a solvent or in water. These commonly used insulating varnishes are based on epoxides, phenolics, polyesters, polyurethanes, silicones or acrylics.
What is impregnation plant?
Vacuum Impregnation Plant is a process in which resins, varnish is forced into integrate parts of its winding to achieve void the insulation. Resin/Varnish Vacuum Pressure Impregnation (for electrical insulation application)
What is vacuum impregnation plant?
Vacuum Pressure Impregnation (VPI) is a process that uses vacuum and pressure to seal porous materials with varnish or resin. The process is used primarily for high-voltage motors and generators to fill gaps in materials to create a void free insulation in various devices.
What is VPI varnish?
VPI (Vacuum Pressure Impregnation) is a process that is a technological step forward from varnishing electric motors. The old dip and bake (in varnish) method of “insulating” motors is replaced by the VPI process for specific reasons: Harsh Environment. Improved Efficiency (through better heat transfer)
How do you impregnate timber?
The impregnation process is carried out by using autoclave, where chemicals are impregnated into timber using vacuum and pressure:
- Timber will be taken into autoclave and primary vacum is established.
- Autoclave is filled with timber preservative;
- Pressure is used to compress protective chemicals into timber cells;
What is pressure impregnated timber?
Pressure-treated lumber is wood that has been immersed in a liquid preservative and placed in a pressure chamber. The chamber forces the chemical into the wood fibers.
What is resin rich?
Resin-rich zones are a common phenomenon in liquid composite molding processes causing unwanted residual stress and deformation. They are normally caused by the gaps between the fiber preform and the internal mold surface due to mold closure.
What is VPI resin?
Within the industry there are basically two types of insulation production methods. One method is referred to as VPI (Vacuum Pressure Impregnation) technology. After undergoing the Vacuum Pressure Impregnation process, the resin penetrated, final product is cured afterwards in an oven.
What does impregnated pinewood mean?
jpg. In Finland, Impregnated timber is pine timber that has been impregnated with an impregnation agent containing copper compounds (C impregnation) into classes A and AB. In terms of colours, in addition to the traditional green there is also brown, which is made by adding a coloured pigment to the impregnation agent.
Why is wood impregnated?
Outdoor wood is threatened by a number of pests such as mold, fungi, insects. Whereas pressure treated timber is protected from any previous threats. The impregnation process is carried out by using autoclave, where chemicals are impregnated into timber using vacum and pressure.