Some Factors of Poor Quality of Insulating Fiberglass Board for Transformer (1)

In this paper, some factors that may cause poor surface quality of insulating  materials fiberglass board in the process of production and processing are summarized as follows:
1. Problems in processing of insulating glass fiber board base material for transformer:
Especially for some thin substrates (generally less than 0.8mm), because of the poor rigidity of the substrates, it is not suitable to use the brush machine to brush the plates.
In this way, it may not be able to effectively remove the protective layer specially treated to prevent the oxidation of the copper foil on the board during the production and processing of the base plate. Although this layer is thin and easy to be removed by brushing the board, it is difficult to use chemical treatment. Therefore, it is important to pay attention to the control during the production and processing to avoid the foaming problem caused by the poor binding force between the copper foil on the board and the chemical copper In the case of blackening of thin inner layer, there are also some problems, such as bad blackening and browning, uneven color and poor local blackening and browning.

2. The surface of insulating fiberglass board for transformer is polluted by oil or other liquid dust during machining (drilling, laminating, milling, etc.) and the surface treatment is poor.
3. The copper brush plate of insulating glass fiber board for transformer is poor:
If the pressure of the grinding plate before copper deposition is too large, it will cause the deformation of the orifice and brush out the round corner of the orifice copper foil or even the leakage of the base material from the orifice, which will cause the blistering of the orifice in the process of copper deposition, electroplating, tin spraying and welding; even if the brush plate does not cause the leakage of the base material, the heavy brush plate will increase the roughness of the copper at the orifice, so the copper foil is prone to over roughening in the process of micro erosion and coarsening, which will also exist Therefore, it is necessary to strengthen the control of the brush plate process, and adjust the parameters of the brush plate process to the best through the abrasion test and water film test.

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