Process for the manufacture of paper webs having CF or CB layers for pressure-sensitive recording

• Main Authors: SCHOEN; HORST, HEYER; HORST W, FRIESEN; WOLFRAM
• Format: Patent
• Language: English
• Published: 28.01.1997
• Edition: 6
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; COLOUR PRINTING; IMPREGNATING OR COATING OF PAPER; LINING MACHINES; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; SPRAYING OR ATOMISING IN GENERAL; STAMPS; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; TYPEWRITERS

PCT No. PCT/EP93/01982 Sec. 371 Date Jul. 26, 1994 Sec. 102(e) Date Jul. 26, 1994 PCT Filed Jul. 26, 1993 PCT Pub. No. WO94/02258 PCT Pub. Date Feb. 3, 1994A process is disclosed for manufacturing paper web containing a CF layer for pressure sensitive recording paper. In order to ensure full sizing, the paper web is subjected to intermass sizing and the coating ink containing color acceptors constituted of color-reactive, mineral pigments is applied with a coating device in which the paper web is guided between two transfer rollers separated by a gap or set at minimal pressure. One of the transfer rollers applies volumetrically pre-dosed coating ink by means of a rotary and driven surface-profiled doctor bar, forming the CF layer on one side of the paper web, and the other transfer roller at the same time applies a volumetrically pre-dosed aqueous solution on the other side of the paper web, also by means of a rotary driven surface-profiled doctor bar. The amount of color-reactive pigment in the dried CF-layer comprises between 3.5 and 5 g/m2.