Paper machine drying section and method of operating the same

US4183148A · kind A · utility

Assignee

• Valmet Oy · FI

Inventors

• Erkki Koski · Minturno, IT
• Martti Koponen · Jyväskylä, FI

Key dates

• Filing date: Jul 1, 1977
• Grant date: Jan 15, 1980
• Expiry date: Jul 1, 1997

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F5/04
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A paper machine drying section has a pair of staggered rows of rotary dryer cylinders which include a first group of cylinders of both rows which form an initial part of the drying section where a web is initially received from a press section. A first endless fabric which forms a closed loop is guided around the above group of cylinders in a manner situating the cylinders of one of the rows within the loop to form inside cylinders therefrom and the cylinders of the other of the rows outside of the loop to form outside cylinders therefrom, this first endless fabric transporting a web which is to be dried around the cylinders of the above group while situating the web between the first endless fabric and the outside cylinders and the first endless fabric itself between the inside cylinders and the web. A second endless fabric structure is pressed against the web only at the portions thereof which lap the inside cylinders for preventing the web from being displaced by centrifugal force outwardly away from the inside cylinders, a suitable speed-control being connected with the second endless fabric structure to provide for the latter a speed of travel according to which the portions o…