Method for producing multi-layer paper

US11680371B2 · 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: Jun 20, 2023
• Expiry date: Jun 26, 2039

Classification

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

Abstract

A method for producing dried multilayer paper is provided comprising dewatering a first aqueous fibrous suspension, thereby creating a first fibrous web; dewatering a second aqueous fibrous suspension, thereby creating a second fibrous web; spraying one or more of a first fibrous web and a second fibrous web with a spray solution or spray suspension, thereby producing at least one sprayed fibrous web; assembling the first fibrous web with the second fibrous web; dehydrating the resulting layer compound by pressing; then dehydrating by supplying heat, which creates the dried multilayer paper. The spray solution or spray suspension contains water and at least one water-soluble polymer P. The polymer P is obtained by polymerizing: 40 to 85 mol % of a monomer of Formula I in which R1=H or C1-C6-Alkyl; and 15 to 60 mol % of one or more ethylenically unsaturated monomers.