panic! More than 70% of gravure faults are in these two places
The scraper, it can be said that more than 70% of the faults in gravure printing occur between the scraper and the platen roller. So, what are the main manifestations of the blade failure? Today, Xiaobian will simply sort it out.
1, scraper line
Phenomenon: Unrelated long lines appear in printed matter and non-lined parts.
Cause: There is a smudge line between the scraper and the plate roller with foreign matter, or the scraper is poorly ground and damaged. Thin thick line: There are hard inclusions, causing blade damage: thick thick lines: soft inclusions, double lines appear in the center of the pattern.
Countermeasure: The ink should be filtered before and after use; the scraper should be ground or replaced; the circulating pump should be filtered during use.
2, scraper dust
Phenomenon: The solid part, the end part of the bold type, has a silky dirty line.
Cause: There is a soft foreign matter accumulation on the inside of the scraper. Due to the transfer of the scraper at the end of the pattern, the foreign matter is left behind and a dirty line is generated.
Countermeasure: remove debris: ink filtration and cleaning the inside of the scraper; reduce the viscosity of the ink; when installing the scraper, you should pay attention to the length of the scraper to avoid too hard or too soft on the scraper.
3, random traces
Phenomenon: In the printed and non-lined parts of the printed matter, a dirty line of 1-50px is randomly generated.
Cause: Small and soft inclusions are dirty after flowing out of the gap between the scraper and the plate roll.
Countermeasure: filtration of the ink; re-cleaning of the environment; the width of the roll before printing must be reset.
In the blade failure, the phenomenon of inclusions is the most common. The thorough filtration of the ink (150-200 mesh) can prevent dust from entering the printing room. It is also an important part to pay attention to the cleaning of the environmental hygiene in the printing room.
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