※Changes in ink
The purpose of the experiment is to find answers to two questions about ink
1. Ink transferability? Is printing controlled by color, viscosity, and pH adjustment?
2· Is the printing effect of different ink supply factories different?
Therefore, the answer is to use 3 kinds of viscosities and 3 kinds of PH values ​​to test from the 3 colors of 3 suppliers. There are 81 changes in the 3X3X3X3. To simplify the procedure, we still use only one ink (GCMI 39) to reduce the number of tests to 27.
The condition of the ink was recorded according to the condition of the time of shipment. The #1 and #3 inks were delivered in 5 gallon barrels (19 liters) and the #1 pH was 9.0 viscosity in 23 seconds. The pH of #3 is 9.1 with a viscosity of 30 seconds. The ink for #2 is a two-tank and one-gallon barrel with a PH of 8.6 and a viscosity of 46 seconds.
Before testing, we adjusted the printing ink to 9 kinds of suitable conditions: 3 kinds of inks each with 3 PH values ​​and 3 kinds of viscosities. The data is PH/9.2/8.8/8.4 with viscosity of 24/21/ 18 seconds, use pure water to adjust the ink viscosity. The adjustment of the pH value uses the ammonia supplied by each supplier separately, and the dilution uses the method of adding water or opening the lid to let it evaporate naturally. Water with a neutral <7.0PH> can also be adjusted down the PH value.
Nine kinds of inks were then used to test the original used plates and materials with the IGT F1 tester. The lowest pressure was <30n> roll pressure and <45n> print pressure. The speed is 0.3 meters/second, and the ink roll is 9.0 bcm/in2.
So there are 405 points to determine the change of ink (3 brands X 9 adjustments X 5 samples X 3 samples for each type of test).
The purpose of the experiment is to find answers to two questions about ink
1. Ink transferability? Is printing controlled by color, viscosity, and pH adjustment?
2· Is the printing effect of different ink supply factories different?
Therefore, the answer is to use 3 kinds of viscosities and 3 kinds of PH values ​​to test from the 3 colors of 3 suppliers. There are 81 changes in the 3X3X3X3. To simplify the procedure, we still use only one ink (GCMI 39) to reduce the number of tests to 27.
The condition of the ink was recorded according to the condition of the time of shipment. The #1 and #3 inks were delivered in 5 gallon barrels (19 liters) and the #1 pH was 9.0 viscosity in 23 seconds. The pH of #3 is 9.1 with a viscosity of 30 seconds. The ink for #2 is a two-tank and one-gallon barrel with a PH of 8.6 and a viscosity of 46 seconds.
Before testing, we adjusted the printing ink to 9 kinds of suitable conditions: 3 kinds of inks each with 3 PH values ​​and 3 kinds of viscosities. The data is PH/9.2/8.8/8.4 with viscosity of 24/21/ 18 seconds, use pure water to adjust the ink viscosity. The adjustment of the pH value uses the ammonia supplied by each supplier separately, and the dilution uses the method of adding water or opening the lid to let it evaporate naturally. Water with a neutral <7.0PH> can also be adjusted down the PH value.
Nine kinds of inks were then used to test the original used plates and materials with the IGT F1 tester. The lowest pressure was <30n> roll pressure and <45n> print pressure. The speed is 0.3 meters/second, and the ink roll is 9.0 bcm/in2.
So there are 405 points to determine the change of ink (3 brands X 9 adjustments X 5 samples X 3 samples for each type of test).
<Table 3>
※ Result report
Hue increases along the a* yellow/green b* red/blue axis, and the hue has always been improved due to viscosity and PH adjustments (the same for every home)
As foreseeable, the biggest change is in brightness, which varies greatly in adjustments but varies from brand to brand. Only supplier #2 reaches the limit of 1.5ΔE in the case of 9.2 pH and 24 seconds viscosity.
The difference between the average ΔE and the GCMI 39 MW standard is 13 for #1, and 7.90 for #18 is 11.49.
Comparison of GCMI 39 MW and best/worst results please refer to
<Table 4>
(to be continued)