Dry fresh air is supplied to the building by the ventilation system, and this can be especially dry in winter. The air is then heated causing the relative humidity to drop. Cold air holds less water than warm air. As the air is warmed the relative humidity therefore drops.
Cooling with air conditioning systems during the summer also dries the air because water is extracted from the air, again causing the relative humidity to drop.
Once the humidity drops below 40% friction causes materials to become electrically loaded and static electricity can build up. This causes paper distortions and the sheets stick together causing problems in the paper inlet of the printers.
By keeping the relative humidity at the required level these problems are prevented. A humidification system will assist in you getting the maximum output from your printer and further provides the following advantages:
• Prevents a halt in production
• Prevents a loss of production
• No build up of static electricity
• No paper distortion
It is impossible to get good printing results without the correct water-ink balance. Poor quality water used in a printing press can greatly reduce the lifespan of the ink and water rollers.
Normal tap water contains calcium carbonate and other minerals, as well as bacteria, and is not suitable for use in the press. Further, the quality of the water varies.
In the past these water fluctuations where kept under control by the use of IPA (alcohol). However IPA is damaging to the environment and its use is becoming more and more restricted. It can also cause serious health problems and is a poison. This has been recognised in the printing and graphics industries and in the Netherlands for example, agreements have been signed to further reduce the use of IPA.
Reverse osmosis water is ideal as the basis for print water because almost all the minerals and bacteria have been removed. By the addition of the appropriate chemicals the RO water is then perfect for use in the press. The clean and stable water created by combining these two processes delivers the following advantages:
• A longer lifespan of the ink and water rollers
• A reduction in the use of IPA
• Stable process water
• A healthier environment
This video shows examples of Cumulus humidification installations at work. Many different types of printing presses and humidifiers are shown: ultrasonic, high pressure and air assisted humidifiers. Our humidifiers will increase output by all types of press: pre-press CTP, offset, rotary presses and digital print.