Why humidify in the Print industry?
Mis-registration Changes in humidity will cause the physical dimensions of the paper to change which results in mis-registration of colours in multi-pass jobs. Any change in the dimensions of the paper, however small, between runs of two or more colour processes and the colours will not line up. Paper curl Humidity control in the print and paperindustry is essential in order to maintain print quality and reduce downtime of machinery from having to addressproblems caused by a dry atmosphere.Typically low humidity environmentsare created in cold periods, as heat generated by machinery and heaters dries the air. In the depths of winter, rH levels can be as low as 15-20%rH instead of the ideal 50-60%rH. Problems caused by dry air include: In dry conditions, moisture is drawn from the exposed surfaces of stacks or rolls of paper and they shrink. However,the centre of the paper still maintains its original moisture content and this causes tight edges and the paper begins to curl. Withhumidif
