Product category:
Printing Presses Ancillary Equipment
News Release from: Weko UK | Subject: Remoistening System
Edited by the Printingtalk Editorial
Team on 20 February 2004
Weko Improves Productivity For Jehovah
Weko has supplied an RFS remoistening system to the Jehovah's Witness print centre in London in the first of seven Weko installations in the organisation's print facilities around the world.
Weko has supplied an RFS remoistening system to the Jehovah's Witness print centre in London in the first of seven Weko installations in the organisation's print facilities around the world The Weko-RFS at the group's UK print centre is integrated into a 64ppm, MAN Roland Lithoman IV web press to replace moisture lost in the drying process
This article was originally published on Printingtalk on 9 Apr 2004 at 8.00am (UK)
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The addition of the Weko-RFS unit allows printed material to recover its natural moisture after leaving the dryer - thereby restoring the original characteristics of the paper.
The Weko-RFS alleviates problems associated with dry-out to improve productivity and quality.
The MAN Roland Lithoman IV with Weko-RFS is currently printing both the 'Watchtower' and 'Awake', two official publications of the Jehovah's Witnesses.
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Each thirty-two-page publication is printed in 148 languages.
Three languages are printed on the MAN of which 1.1 million copies a week are in English.
Peter Bell, the organisation's print centre co-ordinator, explained: "The MAN Roland IV contributes to our overall print capability of around 3.2 million copies a week and usually prints around 90,000 magazines an hour.
At that kind of capacity, we don't want to be inconvenienced by problems with dried-out, brittle paper which might ultimately jam or break the web and lead to unwanted press downtime." The remoistening features of the Weko-RFS also eradicates problems associated with the build up of static electricity, he added, thereby removing concerns about problems in the folding unit, added Bell.
Stacks of finished magazines were also much flatter because of the remoistening system.
The growth of pages after finishing is also avoided as sufficient moisture is added to prevent the paper from absorbing further humidity from the atmosphere.
"We print on MFC 54gsm wood-based papers and would typically lose around 10mm of web width on our other presses that aren't fitted with the Weko unit.
That is avoided as the paper is effectively being re-conditioned and shrinkage is compensated for, so we hardly lose any width at all," commented Bell.
The system works by moistening each side of the web with an applicator unit, consisting of a rotor carrier with a number of rotors or spray plates that correspond to the working width.
The rotors spray a fine fan of moisture onto a precision rubber roller, which in turn presses the damping fluid into the paper web, using a pre-defined amount of pressure.
The amount of moisture that is transferred can be set according to requirements.
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