Method for producing single-layer or multi-layer paper

US11293143B2 · kind B2 · utility

Assignee

• Solenis Technologies, L.P. · CH

Inventors

• Christoph Hamers · Ludwigshafen, DE
• Anton Esser · Mannheim, DE
• Frans De Bruyn · Bad Dürkheim, DE
• Christopher Alan Gray · Schifferstadt, DE
• Ralph Isermann · Ludwigshafen, DE

Key dates

• Filing date: Oct 10, 2018
• Grant date: Apr 5, 2022
• Expiry date: Oct 10, 2038

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H27/30
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method to produce dried single-layer or multi-layer paper is disclosed. The method comprises, for a single-layer paper, preparing and spraying a partially dehydrated first fibrous web with a spray solution or suspension to give a sprayed partially dehydrated first fibrous web, and dehydrating the sprayed partially dehydrated first fibrous web by applying heat to form a dried single-layer paper; or, for a multi-layer paper, preparing and spraying a partially dehydrated layer compound with a spray solution or suspension to form a sprayed layer compound, and dehydrating the sprayed layer compound by applying heat to form a dried multi-layer paper. The spray solution or suspension comprises water and at least one water-soluble polymer P, which is obtained by polymerizing: (i) a monomer of formula H2CCHNHC(0)R1, where R1 is H or C1-C6- alkyl; and (ii) one or more ethylenically unsaturated monomers different from monomer (i).