JP2002053776A - Remover for plate making resist, gravure ink and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remover which is a mixed liquid of low toxicity materials without containing a high toxicity solvent such as toluene and can remove, from the rolls of a gravure printing machine, sensitized films in the plate making step or coated film failures having pinholes generated due to the adhesion of stains in buffing before coating a black lacquer, the adhesion of the fats and oils content or the like, the ink after printing a proof, after printing or the like without causing an environmental pollution. SOLUTION: The remover comprises cyclohexane and the like, ketones, and alcohols at a specified ratio. The ketones are polar solvents which dissolve a polar group-containing substance, and cycohexane and the like are nonpolar solvents which effectively dissolve a nonpolar group-containing substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a coating method for a gravure plate roll which failed due to pinholes or the like caused by contamination of buffing or adhesion of grease before coating of a photosensitive film or a black lacquer in a plate making process. The present invention relates to a plate-making resist and a removing agent such as gravure ink, which can remove a film, ink after proof printing and after printing well without causing environmental pollution.

[0002]

2. Description of the Related Art Conventionally, gravure printing rolls have failed in coating of a photosensitive film due to the occurrence of pinholes due to the adhesion of dirt or grease or the like of buffing before coating the photosensitive film during plate making, and after proof printing and after printing. The ink was removed by a cleaning agent containing toluene and methanol as main components.

[0003]

Toluene is a highly toxic substance registered as a Class 1 Designated Substance by the Chemical Substance Management Promotion Act, which is the Toxic Substances Control Act, the so-called PRTR Law. Mixing toluene with methanol amplifies the skin absorption of toluene. The percutaneous percutaneous absorption allows harmful substances to penetrate through the skin instead of entering through the hand hole, so the skin absorption rate is 4-5 times that of methanol alone.
Double. Methanol has a large transdermal absorption promoting effect on toluene. Conversely, mixing toluene with benzene reduces the skin absorption of toluene. Benzene has a small transdermal absorption promoting effect on toluene. Toluene was also a causative substance of photochemical smog. Against this background, we developed a combination of detergents that do not contain toluene, are less toxic than toluene, and the combination of chemicals does not amplify the effect of promoting percutaneous absorption. There is an urgent need to replace it with a cleaning agent containing methanol as a main component.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a liquid mixture containing a low toxic material without containing a highly toxic solvent such as toluene. Good removal of unsuccessful coating film or ink after proof printing due to pinholes etc. caused by buffing stains or adhesion of oils and fats before coating of photosensitive film or black lacquer without environmental pollution It is an object of the present invention to provide a plate-making resist and a remover for gravure ink and the like, which are satisfactory in terms of environmental characteristics, toxicity and odor.

[0005]

According to the present invention, at least one of cyclohexane, methylcyclohexane, ethylcyclohexane, cyclopentane, methylcyclopentane and ethylcyclopentane, a ketone and an alcohol are contained in a required ratio. And a removing agent for gravure ink and the like.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The resist for plate making and the remover for gravure ink of the present invention include at least one of cyclohexane, methylcyclohexane, ethylcyclohexane, cyclopentane, methylcyclopentane and ethylcyclopentane, and a ketone ( For example, methyl ethyl ketone, acetone, etc.) and alcohols (methanol,
Isopropyl alcohol, etc.) in a required ratio. The removing agent of the present invention is a non-polar solvent of a non-polar group substance such as a hydrocarbon in which cyclohexane, methylcyclohexane, ethylcyclohexane, cyclopentane, methylcyclopentane and ethylcyclopentane are insoluble in water, and ketones are polar groups. Since it is a high molecular polar solvent and alcohols are high molecular solvents containing alcohols,
It has cleaning properties for various polymers, and is particularly effective for removing plate-making resists and gravure inks.

ACGIH (: American Conference of Govemment
al Industrial Hygiensts)-Data from 1999 indicate values indicative of the toxicity of various solvents and are shown in Table 1.

[Table 1]

As shown in Table 1, the allowable concentration of toluene is 10
Since the allowable concentration of methyl ethyl ketone is 200 PPM while the allowable concentration of methyl cyclohexane is 400 PPM, methyl ethyl ketone is less toxic than toluene, and methyl cyclohexane is even less toxic than methyl ethyl ketone. None of cyclohexane, methylcyclohexane, ethylcyclohexane, cyclopentane, methylcyclopentane, and ethylcyclopentane have been registered as Class 1 designated substances by the PRTR method. Neither methyl ethyl ketone nor methanol has been registered as a Class I Designated Substance by the PRTR method.

[0009]

EXAMPLE 1 A photosensitive resist was prepared by removing a photosensitive resist for plate making by using a mixture of 40% by weight of methyl ethyl ketone, 40% by weight of methanol, and 20% by weight of methylcyclohexane, applying the mixture to a plate-making roll, and drying it. Then, the photosensitive resist was successfully removed by immersion and wiping.

[0010]

EXAMPLE 2 A mixed solution composed of 40% by weight of methyl ethyl ketone, 40% by weight of methanol and 20% by weight of methylcyclopentane was prepared as a photosensitive resist removing agent for plate making, and the mixed solution was applied to a plate making roll and dried to dryness. When the resist was dipped and wiped, the photosensitive resist was successfully removed.

[0011]

Example 3 A mixture of 30% by weight of methyl ethyl ketone, 40% by weight of methanol and 30% by weight of cyclohexane was prepared as a black lacquer remover for ablation plate making. When the plate-making roll was immersed in the mixed solution and rotated to apply ultrasonic waves, the black lacquer coating was successfully removed.

[0012]

Example 4 As a black lacquer removing agent for ablation plate making, a mixed solution consisting of 30% by weight of methyl ethyl ketone, 40% by weight of methanol and 30% by weight of cyclopentane was prepared, and applied to a plate making roll and dried to obtain a black lacquer film. Then, the plate was rolled by dipping in the mixed solution, and the plate-making roll was rotated and irradiated with ultrasonic waves. As a result, the black lacquer film was successfully removed.

[0013]

Example 5 As a gravure ink remover, a mixed solution consisting of 40% by weight of methyl ethyl ketone, 30% by weight of methanol and 30% by weight of ethylcyclohexane was prepared, and the mixed solution was used to form a plate on a plate-making roll and proof printing. When used for ink removal, it was successfully removed.

[0014]

Example 6 As a gravure ink remover, a mixed solution composed of 40% by weight of methyl ethyl ketone, 30% by weight of methanol, and 30% by weight of ethylcyclopentane was prepared, and the mixed solution was formed on a plate-making roll and subjected to proof printing. When used to remove the ink, the ink was successfully removed.

The resist for plate making and the remover such as gravure ink of the present invention were able to satisfactorily remove stains from buffing and adhesion of oils and fats before coating the photosensitive film and black lacquer.

[0016]

The gravure plate-making method of the present invention is a solution prepared by mixing a low-toxicity material without containing a highly toxic solvent such as toluene and the like. The coating film that failed due to pinholes and the like caused by dirt from buffing and adhesion of oils and fats before coating, and ink removal after calibration printing and printing can be removed well without environmental pollution. It is satisfactory in terms of environmental characteristics, toxicity, and odor, and it can also satisfactorily remove buffing stains and oils and fats.

Claims (1)

[Claims] 1. A plate making method comprising at least one of cyclohexane, methylcyclohexane, ethylcyclohexane, cyclopentane, methylcyclopentane, and ethylcyclopentane, a ketone, and an alcohol in a required ratio. Remover for resist and gravure ink.