Pressboard is a tried and tested flat insulation material based on cellulose for insulation class A.
Properties of pressboard
Depending on the type of cellulose, fiber preparation and machine settings, different types of pressboard with very special properties can be offered.
The properties and properties of press chips are standardized in DIN 7733 and IEC 60641.
In addition to the high dielectric strength and the good ability to be impregnated with transformer oil, press chips do not have a melting point. Therefore, short-term, high thermal loads (eg a few seconds at 350 ° C) can be withstood.
Processing of pressboard
Press chips can be punched, folded, cut and partially deformed as well as laminated with various foils.
Stamped parts from pressboard
Pressboard can be processed into stamped parts and molded parts for insulation purposes using all common stamping processes.
Pressboard adhesive tapes
Pressboard can be coated with various adhesive systems in order to then use it as an adhesive tape. Adhesive punched parts can then also be delivered on a roll.
Sources of supply for pressboard
Pressboard can be bought from us or from our dealers and distributors.
Dr. Dietrich Müller GmbH also supplies press chips with a diamond-shaped resin coating. After curing, the partial resin coating leads to a partial gluing of the electrical conductors to the layer insulation. The ducts created allow air and moisture to be removed from the transformer in a short time and liquid insulating agents to be poured in.
Corrugated chipboard with different geometries as well as bar grids and bar carpets are also used to form cooling channels. Molded parts made of pressboard can be supplied as barriers at the coil ends of power transformers.
Pressboard is a very strong fine cardboard made from high-quality raw materials with a glossy, smooth surface.
- Insulation class A (up to 105 ° C)
- made of unbleached sulphate pulp
- high flexibility
- high tensile and compressive strength
- Compatibility with impregnating and trickling resins
- good impregnation ability
- also with polyester film inner and outer layer
brands available from us:
Flexiso®, Trivolton®, Triflexil®