Production process of ultrathick insulating paperboard

Abstract

The invention belongs to a production process of an ultrathick insulating paperboard. The process comprises the following steps of: carrying out purification pretreatment on wood pulp, concentrating the pulp which is disintegrated through a hydrapulper to the concentration of 4.2-4.8 percent, entering a pulp pool and sending the pulp to a pulping machine for pulping by a pulp pump, wherein the beating degree of the pulp is 30-34 degrees SR, and the wet weight is 11-15g; entering a pulp forming pool, sending the pulp into a high-efficiency low-concentration slag remover for slag removal by the pulp pump, then entering a pulp stabilizing tank, sending the pulp into a wet paper blank former by the pulp pump, sending the made wet paper blank into a lay-up machine for dehydration, taking out the wet paper blank when the water content reaches 40-50 percent and sending the wet paper blank into a hot press, wherein the drying temperature is 120-130 DEG C, and the drying time is determined according to thickness; taking out a paperboard when the water content of the paperboard is 4-6 percent, putting the paperboard into a constant-temperature constant-humidity chamber for balancing for more than 48 hours, sending the balanced paperboard into an edge cutter for cutting edges, carrying out vacuum packaging after the paperboard is checked to be qualified and warehousing.

Description

technical field [0001] The invention relates to a production process of super-thick insulating cardboard, and belongs to the fields of papermaking process and insulating material manufacturing for transformers. Background technique [0002] Ultra-thick insulating cardboard refers to insulating cardboard with a thickness ≥ 12mm (the current international thickness is 8mm), which is mainly used to replace laminated wood and laminated cardboard for transformer insulation. At present, the laminated wood and laminated cardboard used by transformers to make insulating structural parts are made of wood boards or cardboards, which are bonded and dried. Secondary pollution affects the withstand voltage performance. The intrinsic quality and applicability of ultra-thick insulating paperboard are much higher than that of laminated paperboard and laminated wood. Contents of the invention [0003] The purpose of the invention is to provide a production process for one-time forming sup...

AI Technical Summary

Problems solved by technology

At present, the laminated wood and laminated cardboard used by transformers to make insulating structural parts are made of wood boards or cardboards, which are bonded and dried. Sub-pollution affects the withstand voltage performance. The intrinsic quality and applicability of ultra-thick insulating cardboard are much higher than that of laminated cardboard and laminated wood.

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