During the operation of the machine, the operator should inspect the machine and all printed jobs. Listed below are the contents that are usually checked when the printing press is running.
1. Confirm whether the printing machine has any abnormal noise caused by mechanical failure.
2. Repeatedly check the level of the ink in the ink fountain or the ink pump device. When using ink, check the flow of ink into the ink fountain.
3. Make sure that the replacement paper roll indicator is on. Be prepared to change the paper roll and pick up the paper.
4. In the operation of the printing machine, use strobe flash, video monitor and naked eye to monitor the printing quality. During the operation of the printing press, the registration of the printed product may change.
This change in registration may be due to the following reasons
â‘ The tension of the paper belt between the paper feed roller and output pull roller of the printing press is incorrect.
â‘¡ The rewinding tension is too large.
â‘¢The paper tape is misaligned.
â‘£The material for the paper roll is different.
⑤ The edge of the paper feed roll is loose, and the paper tape is biased to one side.
â‘¥ The thickness of the paper tape on the paper feed roll is not uniform with the adhesive layer.
The inspection of the print is the most accurate print quality inspection. The operator should not only check the print quality of the running paper tape, but also must use the magnifying glass to visually check the subordinate content of the print: the overprint is not allowed, and the ink Defect, color deviation, color matching, ink adhesion or fixation force, etc.
The operator should look for changes in these areas under the magnifying glass
â‘ The registration of the printed product, use a magnifying glass to check the error of the printed product.
â‘¡Cleanliness and clarity of printed products.
â‘¢ The ink color or image is true.
â‘£Ink brushing.
⑤ Defects caused by paper wool or other reasons.
â‘¥ The quality of the printed matter.
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