Use silicon steel as transformer core. How is the insulation between silicon steel sheets? Do you want the glue painted in the middle?
D25/D35 silicon steel sheet is coated with 1U insulation after being rolled out, the gap is small after lamination, and the iron loss in the alternating magnetic field is reduced to the minimum. After the transformer is made, the insulating varnish is soaked and treated mainly for moisture proof and curing.
In fact, the silicon steel sheet in the factory before the coating on the surface of an insulating paint, and the paint film mechanical properties and heat resistance are good, can withstand the core annealing temperature (usually 800 degrees) without damage, therefore bought back the silicon steel sheet surface no longer painted, but sometimes the silicon steel sheet after cutting or after the longitudinal shearing in the moist air surface is easy to rust, so when necessary only in the face coated with antirust varnish on the line.
But not glue is coated with an insulating varnish Tai, the general is also possible, but painted later to dry before use, or sticking together.