Printing, Relief & Offset

Impact of Uncontrolled Humidity

Uncontrolled humidity in printing facilities can lead to various issues affecting the quality of printed materials. Paper, the primary material used in printing, is highly sensitive to changes in humidity. Expansion and contraction of paper due to high humidity can result in weak stencils, pinholing, sticking of photopositives, lengthened drying times, and poor imaging quality.

Consequences of High Humidity

High humidity conditions affect different stages of the printing process. In platemaking, maintaining a constant dry bulb temperature and relative humidity is crucial to produce plates at known control points. Additionally, air cleanliness and ventilation are essential to eliminate chemical fumes and dust errors in plates. In printing, whether using letterpress, lithography, gravure, or digital methods, high humidity can cause issues such as toner adhesion problems, paper jams, ink and paper interaction issues, and ink spreading.

Additional Effects

In digital printing, high humidity can lead to drying delays, ink show-through, and dot gain. Paper storage and shipping are also affected, as exposure to low temperatures can cause rapid moisture absorption and paper distortion.

Causes of Uncontrolled Humidity

Uncontrolled humidity in printing facilities can be caused by various factors such as inadequate ventilation, fluctuations in external weather conditions, and improper storage of paper.

Recommendation

To address the challenges posed by uncontrolled humidity in the printing industry, maintaining optimal temperature and humidity levels is essential. The recommended temperature and relative humidity conditions are between 25 to 27°C and 43 to 47%, respectively, to ensure ideal printing conditions.

Solution

Josem offers adsorption dehumidifying equipment designed specifically for independent humidity control in printing facilities. These dehumidifiers, equipped with provisions for cooling, provide an ideal solution to mitigate the moisture-related challenges faced by the printing industry. From compact units suitable for installation under false ceilings to engineered systems, Josem’s dehumidifiers ensure efficient moisture removal through continuous physical adsorption, helping to maintain optimal printing conditions and improve overall print quality.