Global Patent Index - EP 2860310 A1

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

EP 2860310 A1 20150415 (EN)

Application

EP 14184871 A 20140916

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)

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