Offset Quality Control - Application of Wetting Liquids (4)

Nine, the test of two fountain solutions

Because the conductivity of tap water is high, and the pH of pure water is low, the conductivity is 0. Therefore, the water prepared in a ratio of 3:1 is selected in this experiment.

The tap water has a pH of 7.4 and a conductivity of 890us/cm; the purified water has a pH of 5.6 and a conductivity of zero. According to the ratio of purified water and tap water of 3:1, the pH of the water is 7.02, and the conductivity is 270us/cm.

The test results are shown in the figure below

Ten, test analysis

From the test chart, it can be seen that both A and B dampening fluids are "buffered" fountain solutions. Not suitable for automatic addition of the machine, the concentration of the fountain solution should be manually configured.

A dampening solution PH value: 4.5-5.5; concentration: 4%-0.6%; conductivity: 1500-400us/cm.

B fountain solution PH value: 4.5-5.5; concentration: 5.2% -0.5%; conductivity: 2500-500us/cm.

The two fountain solution additives have different conductivity in the same water quality and same concentration ratio.

Fountain solution suppliers recommend the ratio requirements: A dampening fluid standard concentration of 2% -2.5%, PH value of 4.5-5.5; B dampening fluid standard concentration of 2% (soft water), 3% (hard water), The PH value is 4.9-5.2.

According to the test results: A fountain solution with a concentration of 2%, a pH of 4.7, conductivity of 820us/cm. B fountain solution with a concentration of 2%, PH value of 4.85, conductivity of 1382us/cm.

Due to the need to add about 10% of isopropanol, when the actual ratio is added, the amount of fountain solution should be calculated by adding the total volume of isopropanol. Otherwise, the concentration of fountain solution will be insufficient and the pH will increase. , affect the wetting effect.

Through actual verification in production, from automatic addition to manual addition, the concentration of the fountain solution is accurately controlled, the wetting performance is good, and the printing failure caused by the fountain solution is effectively reduced.

(to be continued)

We can combine non-stick Frying Pan , Saucepan , saucepot, Grill Pan , Pizza Pan , Crepe Pan with different size & thickness freely, many non-stick coatings and handles can be available. 

Production process: Pressed Aluminum Cookware

Forged Aluminum Cookware

Die-cast Aluminum Cookware

Size: 14 / 16 / 18 / 20 / 22 / 24 / 26 / 28 / 30 / 32cm

Thickness: 2.0-5.0mm


safe cookware that doesn`t contain any toxic chemicals or persistent pollutants and is easy to use

non-stick is manufactured without PFAS, PFOA, lead, and cadmium. The coating won`t blister, peel or release any harmful fumes, even if you accidently overheat the cookware

With durable construction for excellent heat conduction and reliable cooking results

The riveted or welded handles are contoured for a relaxed and comfortable grip

The convenient glass lids allow for easy food monitoring without losing the heat and are oven safe up to 420°F

Dishwasher safe

Non-stick Cookware

Non-Stick Cookware,Ceramic Coated Cookware,Marble Coated Cookware,Aluminum Cookware Set

Zhejiang Haoqi Industry And Trade Co.,Ltd. ,