Processing method of high pressrun printing plate and printing plate material thereof

Abstract

The invention relates to a processing method of a high pressrun printing plate, comprising: setting a photosensitive layer on a surface of a lipophilic substrate layer, irradiating the photosensitive layer with laser, to make the lipophilic substrate layer of the parts irradiated by the laser to be exposed after development; and then setting a metal hydrophilic layer on the exposed part of the lipophilic substrate layer, removing the residual photosensitive layer, and completing the process after maintaining and cutting. The process method has characteristics of simple preparation process, low environment pollution, high product quality and high pressrun of the obtained printing plate. Furthermore, a printing plate material can be formed by pre-setting the photosensitive layer on the surface of the lipophilic substate layer. By mass production of the printing plate material, making efficiency of the printing plate is higher, and quality is more stable.

Description

technical field

[0001] The invention relates to a processing method of a printing plate with high printing resistance and its printing plate material, belonging to the field of printing plate making. Background technique

[0002] The printing plate of the printing machine is referred to as the printing plate, which refers to the carrier for printing graphics and texts that transfers ink to the substrate. It is usually divided into four categories: letterpress, gravure, lithography and stencil. Among them, lithography means that the graphic part and the non-graphic part on the printing plate are basically on the same plane, the graphic part is made of lipophilic materials, and the non-graphic part is made of hydrophilic materials; when printing, according to the immiscibility of oil and water According to the principle, the water supply device of the printing machine supplies water to the non-graphic part of the lithographic plate, and then the ink supply device of the printi...

Examples

Embodiment 1

[0037] (1) The 0.25mm thick cold-rolled and calendered brass layer is subjected to single-side grinding treatment to form a grain structure on the surface, and then the impurities and oil stains on the surface of the above-mentioned brass layer are removed; Roller coating coats a photosensitive layer with a thickness of 3 μm, and obtains a printing plate after drying;

[0038] (2) Use a resolution of 2400dpi and an intensity of 120mJ / cm 2 The 405nm ultraviolet laser irradiates the photosensitive layer of the above-mentioned printing plate, and after development, the brass layer is exposed at the part irradiated by the above-mentioned laser;

[0039] (3) Electroplate a layer of 0.003mm thick chromium layer on the exposed brass layer, then react with 5wt% NaOH solution to dissolve the remaining photosensitive adhesive, and obtain printing plate A after repairing and cutting.

Embodiment 2

[0041](1) The 0.4mm thick cold-rolled and calendered brass layer is subjected to single-sided grinding to form a grain structure on the surface, and then the impurities and oil stains on the surface of the above-mentioned brass layer are removed; Centrifugally coat a photosensitive layer with a thickness of 4 μm, and obtain a printing plate after drying;

[0042] (2) Use a resolution of 2500dpi and an intensity of 180mJ / cm 2 The 830nm heat-sensitive laser irradiates the photosensitive layer of the above-mentioned printing plate, and after development, the brass layer is exposed at the part irradiated by the above-mentioned laser;

[0043] (3) Electroplate a layer of 0.004mm thick chromium layer on the exposed brass layer above, then react with 8wt% NaOH solution to dissolve the remaining photosensitive adhesive, and obtain printing plate B after repairing and cutting.

Embodiment 3

[0045] (1) The 0.5mm thick cold-rolled calendered copper layer is subjected to single-side grinding treatment to form a grain structure on the surface, and then the impurities and oil stains on the surface of the above-mentioned copper layer are removed; then glue is applied on the ground-treated side Coating a photosensitive layer with a thickness of 5 μm, and drying to obtain a printing plate;

[0046] (2) Use a resolution of 2500dpi and an intensity of 240mJ / cm 2 The 830nm thermal laser irradiates the photosensitive layer of the above-mentioned printing plate, and after development, the copper layer is exposed at the part irradiated by the above-mentioned laser;

[0047] (3) Electroplate a layer of 0.005mm thick chromium layer on the above exposed part of the copper layer, then react with 10wt% NaOH solution to dissolve the remaining photosensitive adhesive, and obtain the printing plate C after repairing and cutting.

technical field

[0001] The invention relates to a processing method of a printing plate with high printing resistance and its printing plate material, belonging to the field of printing plate making. Background technique

[0002] The printing plate of the printing machine is referred to as the printing plate, which refers to the carrier for printing graphics and texts that transfers ink to the substrate. It is usually divided into four categories: letterpress, gravure, lithography and stencil. Among them, lithography means that the graphic part and the non-graphic part on the printing plate are basically on the same plane, the graphic part is made of lipophilic materials, and the non-graphic part is made of hydrophilic materials; when printing, according to the immiscibility of oil and water According to the principle, the water supply device of the printing machine supplies water to the non-graphic part of the lithographic plate, and then the ink supply device of the printi...

Examples

Embodiment 1

[0037] (1) The 0.25mm thick cold-rolled and calendered brass layer is subjected to single-side grinding treatment to form a grain structure on the surface, and then the impurities and oil stains on the surface of the above-mentioned brass layer are removed; Roller coating coats a photosensitive layer with a thickness of 3 μm, and obtains a printing plate after drying;

[0038] (2) Use a resolution of 2400dpi and an intensity of 120mJ / cm 2 The 405nm ultraviolet laser irradiates the photosensitive layer of the above-mentioned printing plate, and after development, the brass layer is exposed at the part irradiated by the above-mentioned laser;

[0039] (3) Electroplate a layer of 0.003mm thick chromium layer on the exposed brass layer, then react with 5wt% NaOH solution to dissolve the remaining photosensitive adhesive, and obtain printing plate A after repairing and cutting.

Embodiment 2

[0041](1) The 0.4mm thick cold-rolled and calendered brass layer is subjected to single-sided grinding to form a grain structure on the surface, and then the impurities and oil stains on the surface of the above-mentioned brass layer are removed; Centrifugally coat a photosensitive layer with a thickness of 4 μm, and obtain a printing plate after drying;

[0042] (2) Use a resolution of 2500dpi and an intensity of 180mJ / cm 2 The 830nm heat-sensitive laser irradiates the photosensitive layer of the above-mentioned printing plate, and after development, the brass layer is exposed at the part irradiated by the above-mentioned laser;

[0043] (3) Electroplate a layer of 0.004mm thick chromium layer on the exposed brass layer above, then react with 8wt% NaOH solution to dissolve the remaining photosensitive adhesive, and obtain printing plate B after repairing and cutting.

Embodiment 3

[0045] (1) The 0.5mm thick cold-rolled calendered copper layer is subjected to single-side grinding treatment to form a grain structure on the surface, and then the impurities and oil stains on the surface of the above-mentioned copper layer are removed; then glue is applied on the ground-treated side Coating a photosensitive layer with a thickness of 5 μm, and drying to obtain a printing plate;

[0046] (2) Use a resolution of 2500dpi and an intensity of 240mJ / cm 2 The 830nm thermal laser irradiates the photosensitive layer of the above-mentioned printing plate, and after development, the copper layer is exposed at the part irradiated by the above-mentioned laser;

[0047] (3) Electroplate a layer of 0.005mm thick chromium layer on the above exposed part of the copper layer, then react with 10wt% NaOH solution to dissolve the remaining photosensitive adhesive, and obtain the printing plate C after repairing and cutting.

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