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Drying process of super thick insulated pressboard

A technology of insulating cardboard and drying process, which is applied in the direction of papermaking, fiberboard, paper machine, etc., can solve the problems of affecting the withstand voltage performance, complex processing methods, and low production efficiency, so as to improve electrical insulation performance, reduce secondary pollution, reduce The effect on labor productivity

Active Publication Date: 2010-07-21
XINSHAO GUANGXIN ELECTRICAL INSULATING MATERIALS
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AI Technical Summary

Problems solved by technology

At present, the laminated cardboard used by transformers to make insulating structural parts is made of cardboard bonding and drying. Voltage resistance performance, super thick insulating paperboard quality and applicability are better than laminated paperboard and laminated wood

Method used

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  • Drying process of super thick insulated pressboard

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Experimental program
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Embodiment Construction

[0011] Embodiment 1 and 2, the parameter of embodiment 2 is the data in brackets.

[0012] The wood pulp 1 is purified and pretreated 2, and the pulp crushed by the pulper 3 is concentrated 4 to a concentration of 3.5 (4.5)% and enters the coarse pulp pool 5, and the pulp is sent to the refiner 7 by the pulp pump 6, and ground into Slurry with a percussion degree of 28 (32) ° SR and a wet weight of 11 (15) grams is sent to the slurry tank 8, and then the ground slurry is made into a slurry with a concentration of 0.5 (0.7)% and sent to the high-efficiency and low-efficiency pulp by the slurry pump 9. Concentrated slag remover 10, after removing slag, enters pulp stabilization box 11, and then sends it to wet paper blank forming device 13 through pulp pump 12, and sends the prepared wet paper blank 14 into the mold 15 with inner net 16 set, Send the mold together with the press machine 17 to squeeze the water, the pressure is 0.7 (0.9) MPa, the vacuum pump 18 assists the suctio...

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Abstract

The invention belongs to a drying process of a super thick insulated pressboard. In the process, 0.5-0.7 percent pulp is prepared by insulation pulp through conventional treatment, enters a pulp stabilization box and is sent into a wet ground paper forming device through a pulp pump, a prepared wet ground paper is sent into a die which is sleeved with an inner net and is sent into a pressurizer with the die together for water extrusion with the pressure of 0.7-0.9MPa, a vacuum pump assists with water suction and absorption, the wet ground paper is taken out when the moisture achieves 40-50 percent, is sent into a micorwave drying box to be dried through a conveyor belt and is pulled out and sent into a hot press to be dried with the temperature of 115-125 DEG C when being dried with the water content of 25-35 percent, the drying time is determined by the thickness, the wet ground paper is dried until the pressboard water content achieves 4-6 percent and enters a half finished chamber to be in balance treatment for 3-5 days after board disassembly, the paper is treated by edge trimming and finishing and is packaged to be put into a storage after passing the inspections.

Description

technical field [0001] The invention relates to a drying process for ultra-thick insulating cardboard, and belongs to the fields of papermaking technology and insulating material manufacturing for transformers. Background technique [0002] Ultra-thick insulating cardboard is mainly used to replace laminated cardboard with a thickness of ≥12mm and used for transformer insulation structural parts. At present, the laminated cardboard used by transformers to make insulating structural parts is made of cardboard bonding and drying. Voltage resistance performance, super thick insulating paperboard quality and applicability are better than laminated paperboard and laminated wood. Contents of the invention [0003] The purpose of the invention is to provide a drying process for one-time forming ultra-thick insulating cardboard. [0004] The present invention is realized in the following way: the highly chemically pure insulating wood pulp is pretreated, pulped, concentrated to ...

Claims

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Application Information

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IPC IPC(8): D21J1/20D21J1/04D21J1/06D21F13/10D21C3/22D21D1/20
Inventor 刘德云郑小玲
Owner XINSHAO GUANGXIN ELECTRICAL INSULATING MATERIALS
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