Improving adhesion of a security stripe or patch to paper sheets having reinforcing corner and edge watermarks

The invention concerns security documents having edge or corner reinforcing watermarks consisting of spaced bars 13a. If a planar security feature 15 such as a stripe or patch is applied over the watermarks then poor adhesion to the paper substrate results because the feature bridges the gaps betwee...

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Bibliographische Detailangaben
Hauptverfasser:	ADRIAN DONALD ASH, ANDREW MALCOLM MACEY, MALCOLM PAUL BAKER
Format:	Patent
Sprache:	eng
Schlagworte:	BOOK COVERS BOOKBINDING COLOUR PRINTING DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR FILES IMPREGNATING OR COATING OF PAPER LINING MACHINES LOOSE LEAVES MOVABLE-STRIP WRITING OR READING APPARATUS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PERFORMING OPERATIONS PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES PRODUCTION OF CELLULOSE PULP COMPOSITIONS SPECIAL PRINTED MATTER STAMPS TEXTILES TRANSPORTING TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G TYPEWRITERS
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Beschreibung
Zusammenfassung:	The invention concerns security documents having edge or corner reinforcing watermarks consisting of spaced bars 13a. If a planar security feature 15 such as a stripe or patch is applied over the watermarks then poor adhesion to the paper substrate results because the feature bridges the gaps between the bars and has little contact with the paper surface. The method involves forming a raised region 17, by increasing the grammage of fibres, which region joins the adjacent bars within the reinforcing watermark to form a smooth planar surface which is suitable for a subsequent application of a planar security feature.