It can be said that more than 70% of the faults in gravure printing occur between the doctor blade and the plate roller. So, what are the main manifestations of blade failure? Today, the editor will simply sort it out.
1. Scraper line
Phenomenon: Unrelated long lines appear in the printed matter and non-line drawing parts.
Cause: Striated dirt lines with foreign objects between the blade and the plate roller are generated, or the blade is poorly ground and damaged. Thin thick lines: There are hard inclusions that cause damage to the blade: Thick thick lines: There are soft inclusions, and double patterns appear in the central part of the pattern.
Countermeasures: Ink should be filtered before and after use; the scraper should be reground or replaced; the filter should be filtered during the use of the circulating pump.
2. Scraper dust
Phenomenon: The solid part and the end part of the bold type have silky dirt lines.
Cause: There is a buildup of soft foreign objects on the inside of the scraper. Due to the transfer of the scraper at the end of the pattern, the foreign objects are left out and produce stains.
Countermeasure: Remove debris: Ink filtering and cleaning the inside of the blade; reduce the viscosity of the ink; when installing the blade, you should pay attention to the length of the blade to avoid the blade being too hard or too soft.
3. Random drawing marks
Phenomenon: In the pattern and non-line drawing part of the printed matter, a stain line with a height of 1-50px is randomly generated.
Cause: Small and soft inclusions, after flowing out from the gap between the doctor blade and the plate roller, become dirty.
Countermeasures: Ink filtration; environment re-cleaning; the roll width of the printing plate must be reset before printing.
In the case of squeegee failure, the inclusion of inclusions is the most common phenomenon. Thoroughly filtering the ink (150-200 mesh) can prevent the mixing of dust in the printing room. It is also an important part to pay attention to the cleaning of the environmental hygiene of the printing room at any time.
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