Indirect coating device with applicator for providing a uniform coating on an applicator roll

US5538555A · kind A · utility

Assignee

• Voith Sulzer Papiermaschinen GmbH · DE

Inventors

• Uwe Wille · Heidenheim, DE
• Richard Bernert · Giengen an der Brenz, DE
• Oswald Satzger · Giengen an der Brenz, DE

Key dates

• Filing date: Jan 23, 1995
• Grant date: Jul 23, 1996
• Expiry date: Jan 23, 2015

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H23/56
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A device for coating a material web includes a rotatable applicator roll having a surface for collecting a film of a coating composition thereon. The roll has a length defined by first and second ends thereof and a middle region disposed between the first and second ends. The device also includes a blade having an edge. The blade is attached to a blade holder and extends along the length of the applicator roll. The blade and the applicator roll surface form an acute angle and define a coating composition sump. The blade edge and the applicator roll surface define an inlet gap. A doctor element attached to a doctor element holder is disposed downstream of the blade with respect to a direction of rotation of the applicator roll. The blade, the blade holder, the doctor element, and the doctor element holder define, at least in part, an application chamber. At least one of the elements defining the application chamber has bores or other openings for regulating coating composition thickness on the applicator roll.