Method for manufacturing printing plate

A manufacturing method and printing plate technology, applied in the field of plate manufacturing, can solve problems such as difficult to judge, difficult to obtain water-ink balance, not beneficial to printing, etc., to achieve enhanced storage stability, short plate-making time, and high printing quality excellent effect

Inactive Publication Date: 2008-04-30
李伟 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like the technology provided by the patent No. EP1300257, when the Ra value is less than 0.4um, it is usually not beneficial to printing, because it is difficult to get a good water-ink balance during printing.
Moreover, the Ra value of the aluminum version itself can reach 0.3um during the rolling process, so it is difficult to judge whether the Ra value of 0.3um is caused by electrolysis or the aluminum version itself

Method used

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  • Method for manufacturing printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Please refer to Fig. 1, the method for producing positive-type thermal printing plates of the present invention comprises the following steps:

[0047] Step 100: plate degreasing process

[0048] Use a degreasing solution to remove grease from the surface of the plate, including sodium hydroxide.

[0049] Step 200: the process of electrolyzing the plate

[0050] Plates use alternating current when electrolyzing grains. The electrolyte is usually (but not limited to) nitric acid or hydrochloric acid. In order to control the grain profile, some corrosion inhibitors are usually added, such as boric acid, acetic acid, phosphoric acid, sulfuric acid or It is their salts to ensure that no particularly deep pits (valley bottoms) will appear during the electrolysis of the plate.

[0051] In the process of electrolysis, the valley peaks and contours of the grain surface of the plate are not important for the storage quality of infrared sensitive printing plates, especially pos...

Embodiment 2

[0080] The producer takes a 1030mm aluminum coil and produces printing plates on a roll-to-roll line.

[0081] The production process includes the following steps:

[0082] Oil removal step: use 32 g / L sodium hydroxide, the treatment temperature is 50° C., and the treatment time is 30 seconds.

[0083] Electrolysis step: use an electrolytic solution including 8.5 g / L hydrochloric acid and 13.5 g / L acetic acid, and process for 80 seconds at a processing temperature of 30° C., an AC voltage of 11.5 V, and a current of 1000 A.

[0084] Decontamination step: use 7.0 g / L sodium hydroxide, the treatment temperature is 25°C, and the treatment time is 70 seconds.

[0085] Oxidation step: use 200 g / L of sulfuric acid for 80 seconds at a DC voltage of 30 volts, a current of 1000 A, and a temperature of 35° C.

[0086] Post-processing: use polyvinyl phosphoric acid (the original text is Poly(vinyl phosphonic acid)) for 30 seconds at 85°C.

[0087] Then rinse off with clean water and d...

Embodiment 3

[0104] This embodiment and embodiment 2 are comparative examples.

[0105] Get the same quality and batch of aluminum coils in Example 2, use the production process in Example 2 to process and coat, but use the following electrolyte:

[0106] Contains 12 g / l hydrochloric acid and 4 g / l acetic acid.

[0107] After testing, the Ra value of the aluminum plate treated by the above process is 0.7um, and the Rv value is 4.3.

[0108] Coat and dry the same as the aluminum plate in Example 2, and store the aluminum plate in a warehouse at 35° C. for 90 days.

[0109] After processing through the steps in Example 2, it was found that the whole plate base was blue, and it was checked with a magnifying glass of 50 times, and it was found that there were a large number of blue spots on the plate after electrolytic sand molybdenum.

[0110] Because the blue dot absorbs ink during the printing process, the blank part of the printed matter is also colored, so this plate is obviously not su...

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PUM

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Abstract

The invention discloses a method for manufacturing a printing plate, which includes electrolysis of grains, oxidation, coating with heat-sensitive photoresist and subsequent drying process, wherein the heat-sensitive photoresist is decomposed by alkali after being irradiated, electrolyzed During the process, a substrate surface roughness with a maximum valley depth of 2.5 microns is produced, wherein the maximum valley depth is measured with a surface roughness meter and is called the Rv value. The beneficial technical effects of the present invention are: the produced plates can not only be stored stably for several months under the condition that the maximum temperature exceeds at least 40°C, but also its plate-making time is relatively short, the printing quality is excellent, and the process of the method has great impact on production. There are no other special requirements for the equipment, and the produced plates have excellent printing performance and stable water-ink balance.

Description

technical field [0001] The invention mainly relates to the field of plate material manufacturing, in particular to a method for manufacturing printing plate material. Background technique [0002] Computer to Plate (CTP) refers to the process of directly outputting digital pages to printing plates through a computer. This technology not only saves the traditional pre-press process procedures such as outputting film through laser phototypesetting and manual spelling and printing, but also saves the equipment and materials required in the intermediate links, avoids the disadvantages of loss, deformation, and expansion of dots, and reduces the cost of printing. The loss of color and level, and shorten the ink color calibration and registration adjustment time and ink balance time in the printing process, can greatly improve product quality and work efficiency. [0003] Pre-coated photolithography refers to the process of coating a thin heat-sensitive or photosensitive coating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/10B41C1/055B41N3/03B41M5/36
Inventor 李伟皮特·史密斯
Owner 李伟
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