Fourteen introductions to drying techniques for printing inks

1. Discuss work with the ink supplier prior to printing, including the paper used. The best solution to the drying problem is prevention. All paper is different. For example, ink drying on newsprint is completely different from drying on paper like Springhill Opaque Smooth.

2. When printing on dense-surfaced paper, avoid using soybean oil-based inks. Soybean oil is a semi-dry oil.

3. Keep the pH of the fountain solution in the range of 4.0 to 5.0. The higher the acidity, the slower the drying process of the ink.

4. When printing a large area on the ground, the overprinting uses a varnish containing desiccant or a transparent size.

5. Use the recommended amount of desiccant for the ink being used. Too much desiccant plasticizes the ink so that it does not dry.

6. Adding additional desiccant to the fountain solution can improve the drying performance of the ink. Graf O Siec is an example of an additional desiccant, which can be added in amounts of 1 to 3.

7. Make the stack lower at the take-up end of the press.

8. Use large particle dusting to help separate the printed paper and allow more oxygen to enter and react with the oil and the resin.

9. Let the supplier increase the strength of the ink so that it can be printed with a thinner ink layer, which can be more easily fixed and dried.

10. Pre-press the paper before printing because the temperature of the press or paper may be too low and will delay ink drying.

11. Remember that inks made with Reflex Blue extend the drying time. Discuss with the ink supplier.

12. Have sufficient drying time before running or changing work.

13. Use infrared drying to accelerate ink drying.

14. Keep in mind that inks used for film printing are fixed and hardened on tough films within a few hours. Moreover, the best course of action is to discuss the job with the ink supplier and the paper to be used. Some ink drying problems are the result of inadequate carriers, which result in low oxidation processes or lack of available catalyst. Oxidation rates can be increased by incorporating more oil or alkyd resin in the catalyst, or by completely drying the material, such as linseed oil or tung oil, instead of a semi-dry oil, such as soybean oil.

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