SU1384408A1 - Method of treatment of photopolymeric printing plates - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to printing and allows for improved process efficiency and environmental protection. A washing solution is prepared for leaching the gapless printing elements from the spent alkaline aqueous solution by extracting high molecular weight substances from a mixture to a low molecular weight content not exceeding 4.37 g / l of the solution by treating it with montmorillonite clay and flocculating with neutralization between treatment stages given pH. Then, this solution is used to process photopolymer printing forms. 1 tab.

Description

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The invention relates to the printing industry and can be used in the manufacture of embossed forms based on photopolymerizable - DIJA compositions.

The purpose of the invention is to increase the efficiency of the process and environmental protection.

Example 1. In the FTT-21 washer, 8 liters of the washout solution — 0.3% sodium hydroxide solution — are prepared, heated to 29. C, the sample of the exposed photopolymer plate is mounted on the Spine-containing plate and the whitewash elements are washed out until complete washing out the photopolymer layer (FPS) in wide gaps, controlling the completeness and time of leaching of gaps. In this solution, the next batch of homopolymer plates is extruded to the maximum saturation with the components of the photopolymer layer (FPS) of 2 g / l.

The original solution (composition 1) - O, 3% aqueous solution of sodium hydroxide; pH of 12.4.

Processed vmeshny solution, (composition 11) contains, g / l:

Cellulose 0,729 Polyethylene glycol (TsEG-115) 0,267

Sodium acetate 0,277 Sodium phthalate 0,652 Sodium methacrylate 0,303 Triethylene glycol O, .140

Glycerol 0.084

Total content

components in a solution of 2,452

pH of 12.4.

Indicators of FIF quality are presented in the table.

PRI me R 2, The spent washout solution (OVR) obtained in example 1 (composition M) is treated with 3.0 g / l of montmorillonite clay, neutralized to pH 7.0, treated with flocculant. The solution, free of cellulose and polyethylene glycol, spaced over 4 hours, is poured into the washing machine and used to prepare a 0.3% sodium hydroxide solution, and this solution is washed out with the next batch of photopolymer plates. The leaching of the whitespace elements is carried out until the complete leaching of the FPS in wide spaces is achieved.

Purified vyv.vnon solution (composition 111) contains, g / l;

Sodium acetate sodium phthalate sodium methacrylate triethylene glycol glycerol

The total content of components in the solution is 1.456 pH of the solution 7.0. IAD after washing out the second batch

photopolymer plates (composition IV)

contains, g / l:

Cellulose 0.729

Polyethylene glycol (PEG-115) 0.267

Sodium acetate 0,554 Phthalate sodium J, 304 Sodium methacrylate 0,606 Triethylene glycol 0,280 Glycerol O, 168

Total content

components in a solution 3,907 pH of a solution of 12.4. The quality indicators of the photopolymer form (FPP) are presented in the table.

Example 3. OVR, obtained in example 2 (composition IV), is treated with 3.0 g / l of montmorillonite clay, neutralized to pH 7.0, treated with flocculant. A solution free of cellulose and polyethylene glycol, spaced over 4 hours, is poured into a washing machine and used to prepare a 0.3% sodium hydroxide solution and the next batch of photopolymer plates is washed out with this solution. The leaching of the gap elements is carried out until the complete disappearance of the FPS in wide gaps, controlling the completeness and time of leaching of the gaps.

The purified waste washout solution (composition V) contains, g / l: sodium acetate 0.554 sodium phthalate 1.304 sodium methacrylate 0.606 triethylene glycol O, 280 GlycerinO, 168

The total content of the components in the solution is 2.911 pH of the solution 7.0 „

OVR after leaching of the third batch of photopolymer plates (composition VI) content of salt, g / l:

Cellulose Polyethylene glycol () Sodium acetate Phthalate sodium Methacrylate Triethylene glycol Glycerin

Total content

components in a solution of 5,346

pH of 12.4.

The quality indicators of FPP are presented in the table.

Example 4. The ODS obtained in Example 3 (Composition VI) is treated with 3.0 g / l of montmorillonite clay, neutralized to pH 7.0, treated with flocculant. The solution, which does not contain cellulose and polyethylene glycol and settled for 4 hours, is poured into the stripping machine and used to prepare a 0.3% aqueous solution of sodium hydroxide and the next batch of photopolymer plates is washed out with this solution.

The leaching of the whitespace elements is carried out until the complete leaching of the FPS in wide gaps is achieved, the completeness and time of leaching of the gaps are controlled ..

Purified waste water leaching solution (composition UE) contains, g / l:

Sodium acetate sodium phthalate sodium methacrylate triethylene glycol glycerol

0.830 1.956 0.908 0.420

 0.252.

Total content

components in a solution of 4,366

pH of the solution is 7.0.

IAD after leaching of the fourth pair of photopolymer plates (VI VI P) contains, g / l:

Cellulose 0.729 Polyethylene Glycol (PEG-P) 0.267

Sodium acetate 1,107 phthalate sodium 2,607 methacrylate1,210

Triethylene glycol 0,559 Glycerin 0,336

The total content of components in solution6, 815, the pH of the solution is 12.4.

The quality indicators of FPP are presented in the table.

Example 5. OVR, prepared in example 4 (composition VI11), is treated with 3.0 g / l of montmorillonite clay, neutralized to pH 7, -O, treated with flocculant. The solution, free of cellulose and polyethylene glycol, spaced over 4 hours, is poured into the washing machine and used to prepare a 0.3% aqueous solution of sodium hydroxide, and the next batch of photopolymer plates is washed out with this solution. The leaching of the gap elements is carried out until the complete leaching of the FPS in wide gaps is achieved, controlling the completeness and time of leaching of gaps.

The purified waste washout solution (composition 1X) contains, g / l: Sodium acetate 1,107 Sodium phthalate 2,607 Sodium methacrylate 1,210 Triethylene glycol 0.559 Glycerin 0.336

Total content

components in a solution of 5.819 solution pH of 7.0.

IAD after washing out the fifth batch of photopolymer plates (composition X) contains, g / l:

Cellulose 0.729

Polyethylene glycol (PEG-115) 0.267

Sodium acetate 1,384 Sodium phthalate 3,259 Sodium methacrylate 1.513 Trie Tylen glycol 0.699 Glycerol 0.420

The total content of components in a solution of 8.271 pH of 12.4.

The quality indicators of FPP are presented in the table.

The quality of the cleaning process of the spent wash solution is controlled by the content of suspended and surfactants and the pH of the solution.

The quality of washed photopolymer plates is controlled by the following indicators: the angle at the base of the printing elements, degrees; distortion of linear dimensions of stroke elements up to 1 mm, l} the depth of narrow gaps when the distance between the strokes is 0.3-0.5 mm, mkm.

Carrying out samples of photopolymer plates (PPP). Cellulose, as described in examples 1-5, is carried out in the extrusion.

the FVT-21 machine according to the technological instructions until the photopolymer layer (FPS) is completely washed out in wide gaps (more than 1 mm wide) to the metal substrate.

As can be seen from the above examples, the spent washout solution, completely purified from high molecular weight compounds (cellulose and polyethylene glycol), can be used to re-prepare the alkaline washout solution, provided that the concentration of low molecular weight substances that cannot be cleaned does not exceed 4.37 g / l. The use of such a leaching solution instead of water makes it possible to obtain FPPs that meet the requirements of technological instructions. When the concentration of HMS is exceeded by more than 4.37 g / l, the solution is unsuitable for further use, as the washing time is doubled and the linear dimensions of the printing elements are distorted.

Using this method results in significant water savings both due to the elimination of diluted IAD in water.

100 times up to the norms of the maximum permissible concentration of soil ingestion of substances during the discharge of sewage into the sewage system, and due to the 4-fold use of purified water in the technological process of washing out the FPP.

Claims (1)

Invention Formula The method of processing photopolymer printing plates by leaching the blank printing elements with an aqueous alkaline solution of a given concentration and draining the spent solution using a washing aqueous solution to process the following 1x photopolymer forms, characterized in that, in order to increase the efficiency of the process and environmental protection, as an aqueous solution is used to use a waste solution, which is additionally exposed to montmorillonite clay and flocculant with neutralization a solution between stages of exposure to a given pH and a content of low molecular weight substances in it up to 4.37 g / l of solution. Compare the technological indicators of the quality of CellophoT-3 type A photopolymer forms using the washout solution of CBP) - 0.3Z-Horo dispenses sodium hydroxide and purified waste into a different solution (ORP) with different content of higher products