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Problems in the Process of Pressing the Insulating Epoxy Board for Transformer

Insulating epoxy board for transformer is now commonly used as a kind of material. The raw materials for production include epoxy resin, glass fiber cloth, etc. It is a kind of composite material, which needs to be pressed at high temperature. In the process of production, there will be some problems such as surface blooming, core blackening, surface area glue and so on. In this paper, the problems and solutions in the process of epoxy plate pressing are discussed.
1. The surface of insulated epoxy board for transformer is scratched.
The reasons for this problem are uneven resin flow, damp glass cloth and too long preheating time. The resin with moderate fluidity should be used and the heating time should be well controlled.
2. The core of the insulated epoxy board for transformer is blackened and its surroundings are white.
This is due to the excessive volatility of the resin. The problem lies in the step of impregnation.
insulating epoxy board for transformer
3. Cracks on the surface of insulated epoxy board for transformer. The thinner the board, the more likely it is to have this problem.
The cracks may be caused by thermal stress, or the pressure is too large and the pressure is not timely. The solution is to adjust the temperature and pressure.
4. Surface area glue of insulated epoxy board for transformer.
This is easy to appear in thick plate, the thickness of the plate is large, the temperature transfer is slow, resulting in uneven resin flow.
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5. The transformer is laminated with insulating epoxy plates.
This may be caused by poor adhesion of resin or aging of glass cloth. The summary reason is that the quality is too poor, because the quality of raw materials is good.
6. The insulating epoxy board of transformer slides out.
Too much glue will lead to this problem, and the proportion of glue solution is very important.
7. Warpage of insulating epoxy board for transformer.
Heat expansion and cold contraction are physical laws. If it is hot and cold suddenly, it will damage internal stress and lead to product deformation. During production, there should be sufficient heating and cooling time.
insulating epoxy board for transformer

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