Paper is made of vegetal fibres (cellulose) and is intrinsically hygroscopic, which means that it is very susceptible to changes in relative humidity.
In cold seasons, as the heat generated by printing equipments and heating systems dries the air, the water content in the paper drops producing changes in the dimensions and the mechanical properties of the paper.
A correct and stable level of humidity can assure better quality prints, boost productivity, and increase efficiency minimizing costs for machinery downtime and wasted materials. A humidity control system:
• reduces printing misalignments due to dimensional variations of the paper;
• avoids paper cracking during automatic feeding;
• avoids paper curling and waving;
• eliminates electrostatic damage, adhesion and dust attraction;
• optimizes ink absorption;
• reduces paper breakages.
To guarantee optimum quality standards in the printing process the temperature of the room should be 20°C with a relative humidity from 50 to 60%.
humiSteam and compactSteam are popular choices for small & medium size printing presses. For larger presses and factories humiFog and MCmultizone water spray systems offer high output capacities, low energy consumption plus adiabatic free cooling.