Patent · US Expired

Method for incorporating feature substances into a paper web

US7175739B2 · kind B2 · utility

1Cited by

21References

13Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Thomas Attenberger · Poing, DE
Gerhard Stenzel · Germering, DE
Ralf Soltau · Moosach, DE
Manfred Hutmann · Planegg, DE

Key dates

Filing date	Jun 23, 2005
Grant date	Feb 13, 2007
Priority date	—
Expiry date	Jun 23, 2025

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H23/78
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method and apparatus for incorporating feature substances into a still moist but already sufficiently consolidated paper web provides for directing a feature substance suspension onto the surface of the paper web as a laminar jet with low jet pressure. A special pressure control circuit ensures that the jet pressure is always constant regardless of the number of parallel feature substance suspension jets directed onto the paper web. This makes it possible to incorporate a great variety of line codings in paper under the same process conditions without any visible changes in fiber structure occurring in the paper.

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