catalogue search
P. 01
P. 02
|
|
You may also be interested in
HEPA air purifier, Storage tank, Controller, Air humidifier, Portable air purifier
Text version of the page
Web breaks In the lay-down and reel stand areas of
large-scale web-based newspaper
printers, the exposed edges of the
reels dry. As the web runs at speed
through the press, the dry edges are
under tension compared with the
centre. The slightest disruption of the
edge will result in a ‘web break’,
causing the paper to tear right across
its width. Re-feeding through the press
results in considerable downtime and
production loss. Paper cracking This can occur when the paper
becomes dry. Static electrification
Withhumidification Withouthumidification JS Humidifiers offers a comprehensive service of humidifier system design, installation and maintenance. Our range includesspray, steam and evaporative humidifiers and with over 20 years experience in print room and paper storage humidificationwe are ideally place to advise you on which type will be most suitable for your specific application.
Printing humidification
When the relative humidity drops below the electrostatic threshold of 40%rH, thebuild-up of static is enhanced. This results in sheets of paper sticking andmis-feeding on machines, not lying flat on each other or stacking properly as they emerge from the other end of the press.Printing Humidification - 19165 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.Withhumidification Withouthumidification JS Humidifiers offers a comprehensive service of humidifier system design, installation and maintenance. Our range includesspray, steam and evaporative humidifiers and with over 20 years experience in print room and paper storage humidificationwe are ideally place to advise you on which type will be most suitable for your specific application.