Method for processing waste solution in plate-making process of photosensitive lithographic printing plate

Abstract

Disclosed is a method for processing waste solution in the plate-making process of a photosensitive lithographic printing plate, wherein the maintenance performance of the equipment is excellent. Specifically disclosed is a method for processing waste solution in the plate-making process, wherein the waste solution in the plate-making process, which is discharged when the plate-making process of a photosensitive lithographic printing plate is carried out using a developer liquid for a photosensitive lithographic printing plate, said developer liquid being characterized by containing at least one sugar selected from non-reducing sugars and at least one base without containing a silicate and by having a pH within the range of 9.0-13.5, is evaporated and concentrated by an evaporative concentration apparatus, thereby being separated into water vapor and the dissolved component. In the method for processing waste solution in the plate-making process, the waste solution in the plate-making process is heated by a heating means in an evaporation pot that is provided with base resistance and the water vapor separated from the waste solution in the plate-making process is taken out of the evaporation pot and condensed in a cooling means, thereby being turned into reclaimed water.

Description

technical field [0001] The present invention relates to a treatment method for plate-making treatment waste liquid of photosensitive lithographic printing plates, and in particular to waste liquid from positive-type photosensitive lithographic printing plate plate-making treatment with a developing solution containing non-reducing sugar and alkali without using silicate. Liquid handling method. Background technique [0002] Conventionally, a cresol novolac resin has been used as a binder (binder) of the o-quinonediazide compound of the photosensitive component in the photosensitive layer of a positive photosensitive lithographic printing plate. Therefore, a strongly basic silicate of about pH 13 which can dissolve cresol novolac resin is generally used as a developer. [0003] Various alkaline aqueous solutions are known as the aqueous alkaline solution used as the developer of the above-mentioned positive photosensitive lithographic printing plate, and most commonly used a...

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Problems solved by technology

[0012] The above-mentioned methods are effective and useful methods for reducing the amount of waste liquid to be treated. However, as the concentration proceeds, it causes the generation of precipitates, high viscosity, and agglomeration. Insufficient maintenance

[0013] In addition, the following technology has been proposed: try to reduce the precipitates and adhesives in the evaporative concentration kettle, neutralize the waste liquid, add a coagulant, make the condensed components coagulate, filter, and send the filtrate to the evaporative concentration kettle (for example, Referring to Japanese Patent Application Publication No. 02-157084), there is a problem of wasting the cost of coagulant

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