Process and apparatus for inserting security elements into a paper web

In a process to introduce a watermark into pre-moistened but adequately strong paper web, the watermark is applied to the surface as a low pressure-regulated laminar jet. The laminar jet pressure is carefully regulated to ensure that the pressure from each jet is identical irrespective of the number...

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Bibliographische Detailangaben
Hauptverfasser:	ATTENBERGER, THOMAS, SOLTAU, RALF, HUTMANN, MANFRED, STENZEL, GERHARD
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	IMPREGNATING OR COATING OF PAPER PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	In a process to introduce a watermark into pre-moistened but adequately strong paper web, the watermark is applied to the surface as a low pressure-regulated laminar jet. The laminar jet pressure is carefully regulated to ensure that the pressure from each jet is identical irrespective of the number of jets. The fluid is a water-based marker substance. The pressure applied is in the range 30 to 200 mbar. Also clamed is a commensurate paper web (2) spray assembly with a liquid reservoir (13) discharging to jets (11). The assembly further has a pressure regulation device (P1, P2, 26)