Patent · US Active

Papermaking mould for producing two-stage watermarks and method for producing the same

US8524039B2 · kind B2 · utility

1Cited by

8References

21Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Wittich Kaule · Grafing, DE
Karlheinz Mayer · Grünenbach, DE
Bernd Stumbeck · Waakirchen, DE
Wolfgang Wensauer · Tegernsee, DE
Guenther Wild · Hausham, DE
Thomas Gerhardt · Munich, DE
Andreas Aigner · Valley, DE

Key dates

Filing date	Sep 13, 2002
Grant date	Sep 3, 2013
Priority date	—
Expiry date	Jul 28, 2027

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21F11/006
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A screen for producing two-level watermarks is produced by completely closing part of the screen with a viscous sealing compound, which is subsequently cured actively or passively. At the thus closed partial areas of the screen, paper deposit is hindered during papermaking so that the finished paper appears light in transmission in the areas. A mask is used for exactly positioning the sealing compound in the partial areas of the screen and/or for curing the sealing compound only in the given partial areas, whereby in the latter case the uncured areas of the sealing compound are washed out.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.