A new poster from the Web Offset Champion Group complements their best practice guides on paper and roll defect classifications.
Downloadable from the WOCG, the poster shows common defects in five groups – sheet, winding, slitter and mill join, non-uniform rolls, and wrapping-transit-handling defects and damage.
It is designed to provide a common communication terminology to avoid possible confusion. The classifications have been developed by WOCG from those of TAPPI and Ifra and are a useful diagnostic tool, according to founder and technical manager Marcus Edbom.
The group says that when faults occur, it is essential to make the right information available to more rapidly define a problem, its cause and to prevent its repetition. The paper supplier should be informed as soon as possible with a description of fault, a photograph of the problem is very useful; and the roll number(s) must be available to support the printer as quick as possible.
For web breaks, add the press running status, where in the reel it occurred – near the core, middle or the diameter of the reel when the break occurred – to identify any related patterns. Sending samples to the mills for further investigation will help improve quality long term.
The downloadable poster format has been developed from WOCG Best Practice Guides to provide at-a-glance reference to key practices. The PDF format allows for them to be printed on either digital proofing systems or by other digital presses in a format that can range up to A1 size.
Posters and guides are available in English, German, French, Spanish and Italian editions.
Additional information is available in ‘Best Practice Guide 2 – Web break diagnosis’ with five pages dedicated to roll defects, while ‘Guide 1 – Roll to web processing’ provides recommendations to minimise damage from roll handling and storage.
The 36-page guides are available, either for screen viewing or as a downloadable printing file, and are accompanied by two posters of the same title. Access to these downloads is free of charge to members of the Champion Club, membership of which is free available to anyone working in the web offset printing industry.
Register at http://www.weboffsetchampions.com.
A new finishing best practice guide, ‘Perfectly finished web printed products’, has just been published, and aims to improve results through better communication and understanding amongst all participants in the workflow – designers, print users, publishers, printers and binders, and their suppliers.
Formed in 1998 to champion best practice in the web-offset industry, WOCG is supported by members Aylesford Newsprint, Kodak, manroland, Megtec, Müller Martini, QuadTech, SCA and Sun Chemical, with associates including Eurografica, Eltex, Printing Industries of America, System Brunner, Timsons, Welsh Centre for Printing and Coating, Swansea University.