New trend of the hottest gravure printing technolo

2022-08-01
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New trends in gravure printing technology: matrix plastic cylinder on August 7, 2001, the plastic gravure cylinder R & D team personally went to a large gift packaging and printing company in the United States. The high-speed printing test of plastic gravure cylinder was carried out with water-based ink there. Previously, the group has conducted corresponding tests with water-based inks together with Sun Chemical, and the test conducted in the above-mentioned large gift packaging and printing company is the first time that the production conforms to GB, ISO, BS, ASTM, DIN, JIS, cen, en and other domestic and foreign standards

three color packaging movable parts are selected for printing, and water-based ink is used. A total of 1.5 million feet are printed. The six printing rollers are processed by Richmond of Southern graphics system to reduce power supply noise. Three of them may be unfamiliar with the traditional way of processing and manufacturing rollers, while the other three rollers are sent to matrix company. The patented technology is used to add "the viscosity of Loctite Max 2 resin at room temperature is 200 ~ 300mpa or CPS plastic gravure image carrier (plate), and then sent to southern graphics system company for engraving. The two sets of rollers adopt the same cell processing standard. In addition, southern graphics system is also responsible for the proofing test of 6 rollers. Microscopic examination shows that the carving quality of the plastic roller is really excellent. During proofing, it was found that the ink transfer capacity of the plastic drum was slightly higher than that of the copper drum. There is no difference in the ink hole shape between the two groups of rollers. All 6 rollers are finally sent to the packaging printer

after arriving at the printer on the evening of August 7, the research team immediately met with the director of the project and Environmental Engineering Department of the company and jointly determined the following test standards through discussion

1. No special settings for the printer

2. Printing with ordinary water-based ink

3. The average printing speed of the printer is set at 1000 feet per minute

4. Use standard steel doctor blade

5. After starting printing, compare the ink color of the printing sheet with that of the previous printing to see if it is stable

6. After the color matching standard is determined, all live parts of 1.5 million feet shall be printed after being personally signed by the manager in charge of printing production

on the morning of August 8, printing production personnel began to install plastic gravure cylinder on an 8-color Cerutti gravure press. The ink tank and ink bucket are all updated. The reel line, doctor blade and setting parameters are the same as before. After the printing machine is started, each printing color group operates separately, so as to conduct sampling inspection on each color printing sheet. Next, each roller shall be registered and positioned, and then a sample sheet shall be printed for the production manager to use in color matching and sample signing

after research, it is determined that the color matching effect is excellent, the registration is correct, and it can be printed. The research team agreed that the following test requirements have been met so far:

1. The surface of the plastic drum is engraved with an ordinary engraving system

2. Copper roller and plastic roller adopt the same diamond point

3. Use the same printing ink

4. The doctor blade is also the same

test on drum performance and time

after 2 hours of trial printing, yellow stains began to appear on the web. Through the inspection of the yellow printing color group, it was found that some dry and solid ink emerged in the ink bucket, which eventually settled on the printing cylinder through the ink return line, and some accumulated on the surface of the doctor blade, so that the ink could not be transferred to the scraping part of the doctor blade. Such "dry" parts cause scratches on the surface of the plastic cylinder, causing a small part of the water-soluble adhesive layer between the plastic plate and the cylinder to be exposed. Results the adhesive fastness was greatly reduced. After research, it was decided to remove the yellow plastic roller and replace it with a common copper roller

after 4 hours of trial printing, it was found that there were 3-inch wide discoloration strips on the printing paper of cyan printing color group. During the shutdown inspection, the wear on the yellow printing cylinder was not found, but the doctor blade scraped too much ink at one place. The printing production personnel found out after checking the doctor blade device. The ink scraping pressure at the discolored part is too large, which is equivalent to 3 times of the ink scraping pressure at other parts. As a result, the doctor blade is distorted and the pressure at the operating side is increased. After adjusting the pressure of the doctor blade, it is decided to replace the plastic drum, because the damaged part can no longer transfer ink

after 6 hours of trial printing, color spots similar to the yellow color group appeared on the magenta color group. After stopping the machine for inspection, it was found that dry and solid ink also appeared in the ink bucket and ink tank. This time, there was still no wet ink on the surface of the doctor blade and the printing cylinder was damaged. The last plastic drum was replaced by an ordinary drum and the rest of the live parts continued to be printed

after analyzing and comparing the test data, the research team believes that the following situations are basically true:

1. The tolerance of the deep polymer layer of the plastic roller is very accurate

2. The roller surface polished by common technology is the same as the chromium metal surface

3. The carving material is the same as that of copper

4. The ink transfer quality is better than that of chromium metal surface

5. Ordinary doctor blade can be used

6. The printing characteristics are exactly the same as those of common rollers

7. When solvent based ink is used, the durability of short version printing is quite good

8. Further testing is required when using water-based ink

finally, the research group agreed that great progress had been made in the past year. This technology has matured in several gravure printing fields. The use of plastic gravure cylinder can enable gravure printers to obtain a variety of imaging solutions, solve environmental protection problems, promote the use of printing sleeves, and reduce cylinder transportation costs. In short, the plastic gravure cylinder technology will have a significant impact on the gravure field Mikekulancharkrith

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