Method of manufacturing printing plate

FIELD: printing.

SUBSTANCE: method comprises exposing photosensitive layer applied on magnesium plate to ultraviolet radiation, etching in nitrogen acid, removing photosensitive layer, washing in fresh water, and drying.

EFFECT: enhanced quality of printing plate.

3 cl

 

The invention relates to a method of manufacturing a printing plate (cliché) for hot stamping.

A known method of manufacturing printing plates, consisting in the transfer on the surface of a metal printing plate lines and the contour of the specified figure, the formation of grooves engraved on these lines and remove material outside contour (EN 21133567 C1, 41N 1/06, publ. 20.06.1998).

The disadvantage of this form is that the engraving provides no more than 20 lines of 1 cm, which may not provide a high degree of protection securities, which directly depends on the complexity and uniqueness of the protective figure.

A known method of manufacturing printing plates, consisting in the transfer of the specified figure by the imagesetter its positive image on the magnesium plate by exposure to ultraviolet light photosensitive layer applied on the plate surface, followed by etching in the machine in 7% nitric acid when heated following the sequence of several modes of rotation, removing solvent residues photosensitive layer, washing with running water and drying (EN 2207959 C1, 41N 1/06, published. 10.07.2003).

The disadvantage of this method is the high complexity, the complexity of the hardware design.

The claimed method allows to simplify the method of manufacturing a PE is atoi form through the use of certain parameters on the stage of development of the image, which simplifies subsequent processing cycles, allows the use of less aggressive environment, reduces the complexity of the process. In addition, the claimed method provides improved quality of lamination by hot stamping foil by creating a clearer path.

This technical result is achieved due to the fact that in the method of manufacturing a printing form, comprising the imagesetter positive image on the magnesium plate by exposure to ultraviolet light photosensitive layer applied on the plate surface, etching in nitric acid, removing the photosensitive layer, wash with running water and drying, beginning from the image develop in black and white with thick black lines of the drawing, corresponding with positive imagesetter protruding lines on the sheet, not less than 0.08 mm and the distance between the lines is not less than 0.15 mm, and the edge of the image printing plates form a loop with the line thickness not less than 0.5 mm and offset from the edge of not more than 0.7 mm, the plate using a thickness of 2-7 mm, the etching of lead in 5% nitric acid at room temperature, drying is performed by the dryer at 60±3, the remnants of the photosensitive layer are removed chalk powder, optionally chemically polished 3% nitric acid for 15-20 with until a mirror finish, the village is E. why spend a manual filing out a printed form.

In addition, when developing the image with a linear pattern at different angles, refraction angles are used not less than 45 degrees.

In addition, when the imagesetter use a resolution of at least 2500 dpi.

In addition, the exposure time is not less than 45 when the power of UV lamps of not less than 3 kW.

All signs of the claimed method are complexly interrelated set of essential features that are required to obtain the claimed technical result.

The present invention is illustrated in specific examples of implementation.

Example 1.

Development of the image of the specified drawing was done in black and white in vector Corel Draw. The black line on the sheet will be serving at the imagesetter "live image" - positive. Printed form was designed for stamping on glossy coated paper. The thick black lines were set to 0.08 mm, the distance between lines of 0.15 mm On the edge of the image is indented 0.7 mm was applied additional circuit line thickness 0.5 mm

The imagesetter was prepared for permission to 2500 dpi. Image direct, positive, that is readable from the emulsion side (without translation in the negative). In this work was used fotovideo device company MAKO, model of ECRM-46.

Fotovista film was applied emulsion is at the forefront to the magnesium plate thickness of 2 mm, which is pre-charged with a protective film. Illumination of the polymer layer is UV-rays with a wavelength of 360 nm. The exposure time of 45 s at power UV lamps of not less than 3 kW. The etching process was performed manually at room temperature of about 20°C. prior To commencement of work were prepared by two solution of nitric acid 3% and 5%. Etching was performed in a cuvette in a 5% solution of nitric acid using a wide brush with a soft bristle.

The time of etching was chosen depending on the thickness and density of the lines. For image with high density and fine lines time amounted to 40 C. When the etching depth was 0.1 to 0.2 mm, Then acid washed in running water, dried by a dryer at 60°, fotolog washed away and the remains were removed with a light rubbing chalk powder over the plate. Washed away the chalk and conducted chemical polishing 3% nitric acid for 15 s until a mirror finish. The filing out performed manually with the jigsaw. For stamping microrelease clichés with a complex contour in place of wyprawki used re-etching with pre-lacquered those parts of the image which should be visible during embossing. The embossing was carried out on coated paper gilding on pressie at a temperature of 90-100°C. the Foil was used firm Kurts. A simple and efficient method of manufacturing a cliché allowed DOS is ICI imprint complex microrelease picture high-definition.

Example 2.

The development of the image of the specified drawing was done in black and white in vector Corel Draw. The black line on the sheet will be serving at the imagesetter "live image" - positive. Printed form was designed for stamping on offset paper. The thick black lines were set to 0.1 mm, the distance between lines of 0.16 mm On the edge of the image is indented 0.68 mm caused an additional circuit line thickness 0,55 mm

The imagesetter was prepared for permission to 2500 dpi. Image direct positive. Used fotovideo device company MAKO, model of ECRM-46.

Fotovista film was applied an emulsion layer to the magnesium plate thickness 7 mm, which removed the protective film. Illumination of the polymer layer is UV-rays with a wavelength of 360 nm. The exposure time of 45 s at power UV lamp 3 kW. The etching process was performed manually at room temperature of about 20°C. prior To commencement of work prepared two solutions of nitric acid - 3% and 5%. Etching was performed in a cuvette in a 5% solution of nitric acid using a wide brush with a soft bristle.

The etching time is selected depending on the thickness and density of the lines. For a picture with a large relief time was 1.5 minutes Then acid washed in running water, dried by a dryer at 60°, fotolog washed away and the mod and deleted slight rubbing chalk powder over the plate. Washed away the chalk and conducted chemical polishing 3% nitric acid for 20 s until a mirror finish. The filing out performed manually by a fret saw.

The embossing was carried out on offset paper gilding on pressie at a temperature of 120-130°C. the Foil was used firm Kurts. The quality of the print on offset paper no worse than on coated as in example 1.

Example 3.

The development of the image of the given figure was carried out as in example 2. Printed form was intended for stamping on paper with watermarks. The thick black lines were set to 0.1 mm, the distance between lines of 0.17 mm On the edge of the image is indented 0.65 mm caused an additional circuit line thickness 0,55 mm

The imagesetter was prepared for permission to 2500 dpi. Image direct positive. Used fotovideo device company MAKO, model of ECRM-46.

Fotovista film was applied an emulsion layer to the magnesium plate thickness of 2 mm, which removed the protective film. Illumination of the polymer layer is UV-rays with a wavelength of 360 nm. The exposure time of 45 s at power UV lamp 3 kW. The etching process was performed manually at room temperature is about 20°C. prior To commencement of work prepared two solutions of nitric acid - 3% and 5%. Etching was performed in a cuvette in a 5% solution of nitric acid using a wide CI is ti with a soft cloth.

The time of etching and the rest of the modes as in example 1.

We used a linear raster angles. The refraction angles amounted to 45°.

The proposed method has received reprints of various patterns of high quality. The most interesting from the point of view of the effectiveness of the protective properties is the pattern with systematic refraction lines when turning the imprint of the angle of visible glare only the parts of a line located from this angle.

Thus, the developed method allows to produce printing plates for hot stamping foil with high quality print with different drawings on any paper.

1. A method of manufacturing a printing form, comprising the imagesetter positive image on the magnesium plate by exposure to ultraviolet light photosensitive layer applied on the plate surface, etching in nitric acid, removing the photosensitive layer, wash with running water and drying, characterized in that the first developing image in black and white with thick black lines of the drawing, corresponding with positive imagesetter protruding lines on the sheet, not less than 0.08 mm and the distance between the lines is not less than 0.15 mm, and the edge of the image printing plates form a loop with the line thickness of at least 0.5 mm and offset from cu the I is not more than 0.7 mm, the plate used in the thickness of 2-7 mm, the etching of lead in 5%nitric acid at room temperature, drying is performed by the dryer at 60°With the remains of the photosensitive layer are removed chalk powder, optionally chemically polished 3%nitric acid for 15-20 with until a mirror finish, then make manual filing out a printed form.

2. The method according to claim 1, characterized in that when developing the image with a linear pattern at different angles refraction angles are used not less than 45 degrees.

3. The method according to claim 1, characterized in that when the imagesetter use a resolution of at least 2500 dpi.

4. The method according to claim 1, characterized in that the exposure time is not less than 45 when the power of UV lamps of not less than 3 kW.



 

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