EP 2860310 A1 20150415 - Improvements in paper manufacturing
Title (en)
Improvements in paper manufacturing
Title (de)
Verbesserungen bei der Papierherstellung
Title (fr)
Améliorations dans la fabrication du papier
Publication
Application
Priority
GB 201317860 A 20131009
Abstract (en)
The present invention relates to improvements in methods of manufacturing paper, and in particular to improvements in forming stacks of sheets and cylinder moulds for manufacturing paper incorporating security elements. The method of forming a stack of sheets, comprises the steps of making a continuous web of paper having a plurality of sets of counterpoint watermarks (30) distributed along a longitudinal direction of the web. The sets of counterpoint watermarks (30) comprise at least a first set (45) of counterpoint watermarks having a first pattern and a second set (46) of counterpoint watermarks having a second pattern different from the first pattern. The web is slit in a transverse direction of the web into a plurality of interim sheets (31, 32), each sheet comprising one set of counterpoint watermarks (30). The interim sheets (31, 32) are stacked so that the counterpoint watermarks (30) of the first and second sets (45, 46) on the stacked interim sheets (31, 32) overlap each other at a plurality of overlap points (33) and the counterpoint watermarks comprise watermarks having positive regions.
IPC 8 full level
D21F 1/46 (2006.01); D21F 1/60 (2006.01); D21F 11/00 (2006.01); D21F 13/00 (2006.01)
CPC (source: EP GB)
D21F 1/44 (2013.01 - GB); D21F 1/46 (2013.01 - EP GB); D21F 1/60 (2013.01 - EP); D21F 11/008 (2013.01 - EP); D21F 13/00 (2013.01 - EP)
Citation (search report)
- [X] GB 2458485 A 20090923 - RUE DE INT LTD [GB]
- [X] EP 0579461 A1 19940119 - WIGGINS TEAPE GROUP LTD [GB]
- [X] DE 102010034693 A1 20120223 - GIESECKE & DEVRIENT GMBH [DE]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2860310 A1 20150415; GB 201317860 D0 20131120; GB 2519104 A 20150415
DOCDB simple family (application)
EP 14184871 A 20140916; GB 201317860 A 20131009