At present, except for a small amount of light printing that still uses zinc oxide paper as the base plate for offset printing in China, most of them are PS plates based on aluminum plates. At present, the annual consumption of PS plates in China is 130 million to 140 million square meters, which means that a large amount of aluminum metal is consumed. In order to make full use of resources, many domestic printing companies have adopted recycled PS plates, that is, used PS plate regeneration technology to recycle the used PS plates and reuse them to recycle resources, while saving raw materials, and obtaining economic benefits and social benefits. benefit.

In general, the PS plate regeneration process is: first remove the used printing plate ink and photosensitive glue (stripping technology), then undergo electrolytic sand mesh, anodizing, sealing and other treatments, and finally apply photosensitive liquid to make a recycled PS plate . Peeling technology is an indispensable technology of PS plate regeneration process, that is, the ink and photosensitive glue on the used printing plate are completely peeled off from the aluminum plate base, so as to provide a good foundation for PS plate regeneration.

Plate stripping technology

The printing plate peeling technique is closely related to the stripping agent used. Currently, the commonly used printing plate peeling agent and printing plate peeling method are as follows.

1. Strong acid stripping agent

Immerse the used printing plate in strong acid for 10-30 minutes to peel off the ink and photosensitive glue. Strong acid is usually used in concentrated acid. Although strong acid can be used to strip ink and photosensitive glue more thoroughly, sulfuric acid is highly corrosive, corroding the operator's skin, corroding equipment, and polluting the environment. The working environment of workers is extremely poor.

2. Dry ink stripping cleaning agent

The main components of the dry ink stripping cleaning agent are the solvent of ink and photosensitive glue, and various chemical additives such as penetrant, emulsifier, solubilizer, and thinner are added. Wiping the printing plate with dry ink stripping cleaning agent can peel off the ink and photosensitive glue on the printing plate, but because the solvents used are all organic solvents, which are flammable and pollute the environment, and can only be peeled off by hand, which is not conducive to mass mechanization Processing, and the peeling effect is poor, and the cost is high.

3. Pure solvent stripping agent

The pure solvent type stripping agent is a mixed solvent, such as methanol, ethanol, propanol, butanol series mixed with acetone, butanone, ethyl acetate, etc. to form a mixed solvent. This pure solvent type stripping liquid uses all organic solvents, which is not only flammable, but also pollutes the environment due to a large amount of solvent volatilization, and the cost is relatively high.

4. Environmentally friendly ink stripping agent

The main component of the environmentally friendly ink stripper is water, mixed with organic surfactants, of which alkyl phenol oxyethylene ether, polyoxyethylene sorbitan monooleate, etc. account for 1% to 1.5%; inorganic surfactants Sodium tripolyphosphate, sodium silicate, etc. account for 1.2% to 1.4%; organic solvents ethanol, ethylene glycol, benzyl alcohol, etc. account for 10% to 20%; acetic acid, oxalic acid, sulfuric acid, phosphoric acid, etc., 6% to 8%; the rest For water. Since 70% to 80% of the ingredients in the environmentally friendly ink stripper are water, only a small amount of solvent and acid are mixed, so it is not easy to volatilize or burn, does not pollute the environment, and is less corrosive, which is conducive to protecting the health of the operator. Environmentally friendly recycled PS plate ink stripping agent, and has the characteristics of fast stripping speed, low cost and simple process.

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Peeling mechanism of environment-friendly ink stripping agent

Environmentally friendly ink strippers mainly use the activity of surfactants, that is, the presence of both hydrophilic and hydrophobic groups in the surfactant molecules, which have an adsorption effect on the interface, reduce the surface tension of the printing plate, through wetting, penetration, adsorption, The effects of dispersion and peeling make the ink separate from the original surface, so as to achieve the purpose of peeling. The specific process is that the surfactant first penetrates into the interface of the ink and the plate base, which weakens the adsorption of the ink and the photoresist and the plate surface, and together with the wetting and solubilizing effect of the solvent, the ink and the photoresist are rolled in a spherical shape. The wiping effect is separated from the plate base.

In addition, since the presence of acid has a certain corrosive effect on the ink and the photosensitive adhesive layer, it can further promote the separation of the ink and the photosensitive adhesive layer from the plate base, and improve the peeling speed and quality.

The environment-friendly ink stripping agent has strong stripping ability and fast stripping speed. It can not only strip the proofing plate at high speed, but also process the machine plate, and can carry out continuous stripping treatment. The stripping speed is 300-350 sheets (off PS version) / hour. Save time and manpower, and reduce comprehensive costs. Another advantage of the environmentally friendly PS plate ink stripping agent is that it can be filtered and supplemented and recycled, and there is basically no waste liquid discharge, which fundamentally solves the pollution problem of regenerated PS plates.

How to use environmentally friendly ink stripping agent

1. Preparation method

Add the material in the mixing tank by weight percentage, add water first, then add the surfactant to the mixing tank and stir for 30 minutes, then add the acid to stir, and finally add the organic solvent to stir for 1 hour, mix evenly to make an environmentally friendly ink stripper .

2. Intermittent stripping

After pouring the environment-friendly ink stripping agent into the water tank, put the old printing plate to be stripped in the stripping tank, soak it at room temperature for 10 to 20 minutes, take out the clean water to rinse and dry, and then the ink and the photoresist are peeled off.

3. Continuous stripping

Put the printing plate to be peeled on the continuous running peeling production line, and the environmentally friendly ink peeling agent is sprayed onto the plate through the pump, usually after 2 to 6 minutes of spraying, and then washed and dried to complete the peeling treatment.

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