Consumables
Humidifying system for paper printing company
Tuesday 13. May 2008 - Humidification system for paper/print media industry
Quality control is becoming more and more important compared to the past, especially in consequence of the diffusion and improvement of the machineries for printing at high speed and high quality. The new humidification plants proposed by Messrs Mendizza srl make it possible to put a stop to the many problems arising when job conditions and processing take place in not well conditioned environments.
Problems in print caused by low humidity level:
Unfortunately the air conditioning systems in the factories have not been renewed and modified to the new machineries installed. Owing to the heat and the ventilation emitted, the humidity tends to be different from the stock store and the different print processing rooms. If humidity level is low, the paper modifies its condition and becomes undulated and corrugated, causing the following problems:
1) Gaps of colour
2) Non-uniformed print
3) Reduction of the speed of the machineries
Printing problems caused by electrostatic charges:
On the contrary, the generation of electrostatic charges is not related to the humidity of the paper, but to the heat and the speed of the rollers of the printer. In other words, the printing machine can be defined as a generator of electrostatic charges, that cause the following problems:
1) Feeding stop due to paper sticking
2) Non-uniformed paper piling on delivery part
3) Misfolding of web offset
Many factories use ionizers to remove these obstacles but it is however very difficult to control every point that generates the charges.
As it is proved that at high humidity levels there are nearly no electrostatic charges, it is clear that it is better to control and regulate the humidity in printing rooms, in order to keep the RH% level between 50 and 60%, or to control and humidify specific working areas, (easier than trying to remove charges after they generated).
An appropriate humidification:
In order to oppose the unfavourable effects caused by the heat and air exhaust from printing machines, effective conditioning plants are necessary; however they lead to high installation and running costs.
An efficacious remedy to solve the problem can be the new generation of humidifiers, whose important characteristics to consider and prefer when selecting are:
1) effective humidity raising and precise control system
2) Fineness of the droplet of the mist
3) Installation, use and regulation easiness
4) Reduced maintenance and operating costs
The devices proposed by Mendizza srl prove to be winning, as they meet the above mentioned points.
Thanks to a wide range of humidifiers that suit well to any working areas, both as general humidification plant and as localised devices to support already existing conditioning systems, it is possible to restore the right humidity in printing rooms and in stock stores.
Technical characteristics:
As it is well-known, the drops with maximum diameter less than 50? can be sprayed in the air and easily evaporate. The new AKIMist device showed at DRUPA, thanks to the exclusive drop crushing process, is able to produce an excellent quality of the fog, with drops of average diameter less than 10?, (called DryFog), and so allows an efficacious humidification, also localised (very near the machineries), without the dangers of condensate or soaking.
Dryfog AKIMist works with compressed air and has a lower consumption of energy compared to other systems.