Diamond Dotted Presspaper improves the mechanical strength of oil-filled transformer windings without reducing partial discharge levels. Hechin manufactures this paper by applying discrete dots of B-stage resin on both sides in a diamond pattern. The size and shape of the dots are carefully chosen to avoid interfering with vacuum drying and oil impregnation.
During B-stage, the resin dots are dry and tack-free, permitting storage and handling similar to normal presspaper. When the winding is heated for drying purposes, the adhesive dots melt and cure, thus creating permanent bonding sites unaffected by further heating cycles that may occur in service. The bonding strength is adequate to support effective gluing in unsupported coil design.
The pinhole-free multi-ply paper allows single layer application in LV foil windings. Temperature rise time in the drying oven is important, particularly during the final transition to the temperature at which the resin starts to melt. To obtain maximum bond strength, this transition should be completed as swiftly as possible. The drying requirements of the transformer normally provide for adequate curing of the resin.
The presspahn I diamond is formed by a base of high density paper manufactured from virgin pulp printed on both sides with a thin layer of epoxy resin in state B rhomboid. The B-staged resin has been applied at low temperature in order to retain its shape but is not fully polymerized. a temperature above 105 ° C is required to complete the curing process.
The times and temperatures recommended process must be respected to ensure maximum strength and durability of the assembly.
To prevent premature polymerization of the resin is recommended to keep the presspahn I diamond in a cool environment at all times.
1).Density :0.85~1.10 g/cm3
2). Width: 800mm, 960mm, 1000mm, 1050mm, 1200mm, 1300mm
3).Thickness:0.08mm, 0.13mm, 0.18mm, 0.25mm
4). good dielectric properties and good mechanical properties after heat solidification
2. Color: nature,brown
3. Application :It is to be used in oil-immersed transformers for the insulation between coils. On the insulation layer, there is a layer dotted epoxy resin that will be changed with high temperature change that is to be called as felt.
Hechin can custom slit-to-width, die cut and punch press custom parts, and sheet Kraft paper to your specification, along with other customized solutions. Request your quote for custom parts today!