Global Patent Index - EP 1052328 A3

EP 1052328 A3 20010404 - Gravure paper and a method for its production

Title (en)

Gravure paper and a method for its production

Title (de)

Tiefdruck-Papier und Herstellungsverfahren für dieses Papier

Title (fr)

Papier hélio et un procédé pour la fabrication du même

Publication

EP 1052328 A3 20010404 (DE)

Application

EP 00102731 A 20000210

Priority

DE 19922390 A 19990514

Abstract (en)

[origin: EP1052328A2] In the prodn. of paper for gravure printing, with a max. roughness depth of 1.4 mu m, a fiber suspension is prepared with a Canadian Standard Freeness (CSF) rating of ≥ 50 ml CSF and pref. 50-120 ml CSF. The suspension is converted into a paper web the web formation stage of a papermaking machine, followed by a water extraction press station and a drying stage. A slurry is applied to the unfinished paper web, containing pigments and/or filling materials, between the start of web formation and a dry content of the paper of ≤ 90%. The slurry has a fiber content of 2-60% and pref. 5-30%. The paper requires no further coating The web passes through a press station after the slurry application, which is on both sides of the web. At least one slurry coating is applied at the web formation stage and/or at the press station. At least one slurry coating is applied to the paper w with a dry content of ≤ 55% and pref. 3-55%. The slurry coating is applied to the web through a screen in a dry mass weight f at least one coating on one side of the web of 0.5-10.0 g/m<2> and pref. 1.0-10.0 g/m<2>. The slurry containing pigments and/or filling materials is prepared with a fiber content of pref. 10-95% and especially 20-60%. The fiber web (4.1) is formed from the stock inlet (1) with at least two and pref. three layers. One layer, and pref. the two outer layers (4.2,4.3) ar wholly of the pigment/filling material slurry and at least one layer (4.1) and pref. the center layer is of the paper fiber pulp The web is passed through a web formation stage, a press station and a drying section, without further surface coating. The slur contains kaolin, clay, ground CaCO3, precipitated CaCO3, TiO2, talcum and bentonite. It also contains a retention agent, fixing agents, dispersion agents, adhesive glue agents, bonding agents and a fine matter suspension. The pigment/filling material slurry has a fiber content with a rating of ≤ 30 ml CSF and pref. ≤ 20 ml CSF. The fiber content the outer pigment/filling material layers is 50-100% less than the fiber content of the center layer.

IPC 1-7

D21F 11/04

IPC 8 full level

D21F 9/00 (2006.01); D21F 11/04 (2006.01); D21H 19/84 (2006.01); D21H 23/28 (2006.01); D21H 23/54 (2006.01)

CPC (source: EP US)

D21F 9/006 (2013.01 - EP US); D21F 11/04 (2013.01 - EP US); D21H 19/84 (2013.01 - EP US); D21H 23/28 (2013.01 - EP US); D21H 23/54 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

EP 1052328 A2 20001115; EP 1052328 A3 20010404; EP 1052328 B1 20060927; AT E340895 T1 20061015; DE 19922390 A1 20001116; DE 50013508 D1 20061109; US 6423181 B1 20020723

DOCDB simple family (application)

EP 00102731 A 20000210; AT 00102731 T 20000210; DE 19922390 A 19990514; DE 50013508 T 20000210; US 57174400 A 20000515