Production process of sulfur-free circuit board isolation paper

Abstract

The invention discloses a production process of sulfur-free circuit board isolation paper. The production process comprises the following steps: S1, pulp preparation: adopting bleached sulfate softwood pulp and bleached sulfate hardwood pulp as raw materials, mixing the raw materials, adding water, and pulping for 8-10min to obtain pulp with the concentration of 4.5-5.0%; S2, primary dilution: transferring the slurry obtained in the step S1 to a 1 # mixed slurry tank, and adding water to dilute to 3.0-3.5%; S3, concentration: concentrating the slurry hydraulic fluid obtained in the step S2 until the concentration is 25-30%; S4, secondary dilution: adding water into the slurry obtained in the step S3 in a 2 # mixed slurry tank to dilute the slurry to 4.5-5.0%; S5, grinding into thick liquid: transferring the thick liquid obtained in the step S4 into a pre-beating thick liquid pool, and feeding the thick liquid into a grinding machine for grinding into thick liquid; S6, forming is conducted; S7, surface sizing; and S8, calendaring and coiling. The invention has the advantages that the content of water-soluble chloride and water-soluble sulfate in the raw materials is reduced, and meanwhile, the uniformity and the surface strength are good.

Description

technical field [0001] The invention relates to the technical field of papermaking, more specifically, it relates to a production process of a sulfur-free circuit board release paper. Background technique [0002] The electronic circuit board is composed of an insulating base plate, connecting wires and pads for assembling and welding electronic components, and has the dual functions of a conductive line and an insulating base plate. Small in size and low in cost, it has been widely used in the production and manufacture of electronic products. [0003] Sulfur-free circuit board release paper is a special paper used to isolate electronic circuit boards. Its main function is to protect the surface of electronic circuit boards from scratches during production and transportation. It cannot be oxidized with the electronic circuit, causing problems such as corrosion of the electronic circuit. Therefore, the release paper is required to achieve uniform fiber structure, neutral p...

AI Technical Summary

Problems solved by technology

If papermaking is carried out through ordinary papermaking procedures (pulping, filtering, refining, forming, sizing, drying), a certain amount of water-soluble chlorides and water-soluble sulfates will adhere to the fibers, which cannot meet the requirements.

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