Flexographic printing experience
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One issue that is often mentioned in training at flexographic printing companies is ink management. If the ink management is in place, the efficiency of the press will be improved to some extent, and the loss will be reduced. Frequently mentioned problems are as follows (only a few are listed here): standardization of cell volume in the entire printing shop; standardization of the ink supply system (scraping knife on all presses); ink dispensing procedure; inventory control between inks; manual proofing machine Relevance to the printing press. In this practical article we will discuss the relationship between proofing and printing.
Test procedure for manual proofer and press correlation:
1. Before starting the operation, confirm and mark the three test inks to ensure that the pH and viscosity of the ink are normal. Choose a red, blue and green tinge
2. Collect three to four commonly used substrates for testing;
3. Debug the printing press and select the anilox roller used for spot color printing;
4. Install a layered version on one plate cylinder and a solid negative plate on the other roller;
5. The test ink is used to print the field on each substrate using a layered and negative version. If the sleeve has not been used in production, a tone jump may occur. The hardness of the sleeve and the plate material is different, and the amount of ink transferred may vary. Therefore, the testing and comparison of the two is very important.
6. The technical data of the anilox roller (the cell volume bcm and the number of mesh lines and the anilox roller label) were recorded, and the printed samples were labeled. Bring the proofs and test ink back to the varnishing room. Use a simple form to determine the appropriate anilox roll;
7. Select the manual proofing machine anilox roller closest to the cell volume of the anilox roller used on the printing press, and install it on the manual proofing machine;
8. Use the manual proofer to compare with the sample of the printing press; repeat the above process until the proof proof and the printed proof match to determine the matching proofing roller;
9. Confirm the proof with the data measured by the naked eye or spectrophotometer;
10. Use other test inks for proofing to confirm the test results;
11. Record the test results in the corresponding anilox roll table;
Reasonable use of manual proofing machine to maintain accurate records, reduce color calibration time, reduce waste and improve printing machine operation efficiency through this simple link. For more help, contact the supplier of inks and anilox rolls. Easily respond and keep relevant records at any time.
Tools to be configured in the ink mixing room
Efficient ink management must ensure that at least the following instruments and equipment are available:
1. High quality manual proofing machine with squeegee to ensure stable ink metering;
2. A microbalance for measuring and making test samples, suitable for weighing balance inks;
3. The latest version of the Pantone manual;
4. a sample look-up table for detecting color samples;
5. A pH meter (measured pH) and a Zahn cup to ensure stable ink performance;
6. Spectrophotometer
In this article series, Mr. Vincent DiTrolio, President of the DiTrolio Flexographic Printing Association, will explain the practical problems that are common in flexographic printing. Mr. Vincent DiTrolio has 19 years of experience in the flexo industry and has been providing training and consulting services to the industry through the DiTrolio Flexographic Printing Association he founded. The association is approved by the Illinois Department of Education and the US Department of Veterans Affairs. established.
Is the press operator Joe still using a $300,000 printing press as a color proofer? Is Joe still thinking that his color calibration on the press is faster than in the ink? Indeed, Joe can adjust the amount of ink to perform on-site color correction, and finally get a satisfactory sample. But the downside is that there will be some problems next. Joe had to retry the next time he printed, and when he recalled it before adding or reducing, the press would stop waiting. Now we think that Joe is a great operator, he can use the conditions he has to produce high quality products, but in order to further improve his ability to remain competitive in the global economic environment, we need to provide the right instruments. , operational processes and practical capabilities to improve operational efficiency and productivity.