On August 7, 2001, the plastic gravure cylinder R&D team personally went to a large gift package printing company in the United States. There, water-based inks were used to perform high-speed printing tests on plastic gravure cylinders. Previously, the team had been using water-based inks to conduct tests with Sun Chemical, and the test performed by the large gift-wrapping company above was the first production test.
The printing job selected three-color packaging jobs, using water-based inks, printing a total of 1.5 million feet. Six printing cylinders were processed by Richmond Graphics of Southern Graphics System. Three of the rollers were machined in the traditional way, and the other three rollers were sent to Matrix. Patented technology was used to attach a plastic gravure image carrier (plate) to Southern Graphics Systems for engraving. Both drums use the same CELL processing standard. In addition, the Southern Graphics System Company is responsible for the proofing of the six rollers. Microscopic examination showed that the engraving quality of the plastic roller was superior. When proofing, the amount of ink transferred by the plastic roller was slightly higher than that of a copper roller. There is no difference in the shape of the ink holes between the two sets of rollers. All six rollers are finally sent to the packaging printer.
After arriving at the printer on the evening of August 7, the research team immediately met the director of the company's project and environmental engineering department, and after discussion, determined the following test standards.
1, no special settings for the printing press;
2, using ordinary water-based ink printing;
3. The printing speed of the printing press is set at an average of 1,000 feet per minute;
4, the use of standard steel squeegee;
5. After the start of printing, compare the ink color of the print with the ink color of the previous several times to see whether it is stable or not;
6. After determining the color matching standards, all 1.5 million-foot jobs must be printed by the manager in charge of printing production.
On the morning of August 8, printing production personnel began installing a plastic gravure cylinder on a 8-color Cerutti gravure press. The ink tank and ink fountain are all updated. The used reel line, squeegee and setting parameters are the same as before. After the printing machine is turned on, each printing color group is run separately, so that each color sheet can be sampled and checked separately. Next, each roller is registered and positioned, and then a proof sheet is printed out for the production manager to use when color matching the sample.
After the study confirmed that the color effect is excellent, the registration is correct and can be printed. The research team agreed that the following test requirements have been met so far:
1. Using an ordinary engraving system to carry out engraving processing on the surface of the plastic drum;
2. The same diamond-shaped dots are used for the copper roller and the plastic roller.
3, using the same printing ink;
4, squeegee knife is also the same.
About the drum performance and time test After the test print was performed for 2 hours, a yellow stain began to appear on the web. After the inspection of the yellow printing group, it was found that some dry solid ink appeared in the ink fountain. These dry solid inks eventually landed on the printing cylinder via the ink return line, and some of them accumulated on the surface of the doctor blade, so that the ink could not be transferred to the scraper. Ink knife scraping pressure. Such "dry" spots cause scratches on the surface of the plastic roller, resulting in the appearance of a small portion of the water-soluble adhesive layer between the plastic plate and the roller. As a result, the adhesive fastness is greatly reduced. The study decided to remove the yellow plastic drum and replace it with a common copper drum.
When the trial printing was carried out for 4 hours, it was found that a 3 inch wide color-streaked bar appeared on the printed paper surface of the cyan printing color group. The shutdown inspection also did not see the kind of wear on the yellow printing cylinder, but found that the amount of ink scraped in one place of the squeegee blade was too large. The printing production personnel discovered the squeegee device. The squeegee pressure at the decolorization site is too large, which is equivalent to 3 times the squeegee pressure at other sites. As a result, the squeegee blade is distorted and the pressure at the operation side is increased. After adjusting the squeegee pressure, it was decided to replace the plastic roller, because the ink could not be transferred to the damaged part.
When the test printing was carried out for 6 hours, a color patch similar to the yellow printing color group appeared again on the magenta printing color group. After the shutdown inspection, it was found that dry ink was also found in ink fountains and ink tanks. This time, there was still a situation where the surface of the squeegee did not stick wet ink and scratched the printing roller. The last plastic drum was replaced, replaced by a normal drum, and the rest of the work was printed.
After analyzing and contrasting the test data, the research team considered the following facts to be true:
1. The tolerance of deep polymer layer of plastic roller is very accurate;
2. The surface of the drum polished by ordinary techniques is the same as the surface of the chrome metal;
3, the engraving material is the same as copper;
4, the transmission of ink quality is better than chrome metal surface;
5, can use ordinary squeegee;
6, printing characteristics and universal drum exactly the same;
7, the use of solvent-based ink when short-run printing durability is quite good;
8, the use of water-based ink fashion needs further testing.
In the end, the research team agreed that great progress has been made in the past year. This technology has matured in several fields of gravure. The use of a plastic gravure cylinder allows gravure printers to obtain a variety of imaging solutions to solve environmental problems, facilitate the use of printing sleeves, and reduce roller transport costs. In short, the plastic gravure cylinder technology will have a major impact on the gravure printing field. [United States] Mike Kuranczak Rith
The printing job selected three-color packaging jobs, using water-based inks, printing a total of 1.5 million feet. Six printing cylinders were processed by Richmond Graphics of Southern Graphics System. Three of the rollers were machined in the traditional way, and the other three rollers were sent to Matrix. Patented technology was used to attach a plastic gravure image carrier (plate) to Southern Graphics Systems for engraving. Both drums use the same CELL processing standard. In addition, the Southern Graphics System Company is responsible for the proofing of the six rollers. Microscopic examination showed that the engraving quality of the plastic roller was superior. When proofing, the amount of ink transferred by the plastic roller was slightly higher than that of a copper roller. There is no difference in the shape of the ink holes between the two sets of rollers. All six rollers are finally sent to the packaging printer.
After arriving at the printer on the evening of August 7, the research team immediately met the director of the company's project and environmental engineering department, and after discussion, determined the following test standards.
1, no special settings for the printing press;
2, using ordinary water-based ink printing;
3. The printing speed of the printing press is set at an average of 1,000 feet per minute;
4, the use of standard steel squeegee;
5. After the start of printing, compare the ink color of the print with the ink color of the previous several times to see whether it is stable or not;
6. After determining the color matching standards, all 1.5 million-foot jobs must be printed by the manager in charge of printing production.
On the morning of August 8, printing production personnel began installing a plastic gravure cylinder on a 8-color Cerutti gravure press. The ink tank and ink fountain are all updated. The used reel line, squeegee and setting parameters are the same as before. After the printing machine is turned on, each printing color group is run separately, so that each color sheet can be sampled and checked separately. Next, each roller is registered and positioned, and then a proof sheet is printed out for the production manager to use when color matching the sample.
After the study confirmed that the color effect is excellent, the registration is correct and can be printed. The research team agreed that the following test requirements have been met so far:
1. Using an ordinary engraving system to carry out engraving processing on the surface of the plastic drum;
2. The same diamond-shaped dots are used for the copper roller and the plastic roller.
3, using the same printing ink;
4, squeegee knife is also the same.
About the drum performance and time test After the test print was performed for 2 hours, a yellow stain began to appear on the web. After the inspection of the yellow printing group, it was found that some dry solid ink appeared in the ink fountain. These dry solid inks eventually landed on the printing cylinder via the ink return line, and some of them accumulated on the surface of the doctor blade, so that the ink could not be transferred to the scraper. Ink knife scraping pressure. Such "dry" spots cause scratches on the surface of the plastic roller, resulting in the appearance of a small portion of the water-soluble adhesive layer between the plastic plate and the roller. As a result, the adhesive fastness is greatly reduced. The study decided to remove the yellow plastic drum and replace it with a common copper drum.
When the trial printing was carried out for 4 hours, it was found that a 3 inch wide color-streaked bar appeared on the printed paper surface of the cyan printing color group. The shutdown inspection also did not see the kind of wear on the yellow printing cylinder, but found that the amount of ink scraped in one place of the squeegee blade was too large. The printing production personnel discovered the squeegee device. The squeegee pressure at the decolorization site is too large, which is equivalent to 3 times the squeegee pressure at other sites. As a result, the squeegee blade is distorted and the pressure at the operation side is increased. After adjusting the squeegee pressure, it was decided to replace the plastic roller, because the ink could not be transferred to the damaged part.
When the test printing was carried out for 6 hours, a color patch similar to the yellow printing color group appeared again on the magenta printing color group. After the shutdown inspection, it was found that dry ink was also found in ink fountains and ink tanks. This time, there was still a situation where the surface of the squeegee did not stick wet ink and scratched the printing roller. The last plastic drum was replaced, replaced by a normal drum, and the rest of the work was printed.
After analyzing and contrasting the test data, the research team considered the following facts to be true:
1. The tolerance of deep polymer layer of plastic roller is very accurate;
2. The surface of the drum polished by ordinary techniques is the same as the surface of the chrome metal;
3, the engraving material is the same as copper;
4, the transmission of ink quality is better than chrome metal surface;
5, can use ordinary squeegee;
6, printing characteristics and universal drum exactly the same;
7, the use of solvent-based ink when short-run printing durability is quite good;
8, the use of water-based ink fashion needs further testing.
In the end, the research team agreed that great progress has been made in the past year. This technology has matured in several fields of gravure. The use of a plastic gravure cylinder allows gravure printers to obtain a variety of imaging solutions to solve environmental problems, facilitate the use of printing sleeves, and reduce roller transport costs. In short, the plastic gravure cylinder technology will have a major impact on the gravure printing field. [United States] Mike Kuranczak Rith
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