Valmet Aktiebolag

Mattias Johansson

Dennis Edward Jewitt

Anders Lindén

Michael Bjerke

Scott McClure Wightwick

Martin Emanuelsson

Dennis Jewitt

Scott Mcclure Wightwick

The invention relates to a drying section and comprises one or more through air drying cylindersand a permeable fabricthat runs in a loop and wraps part of the circumference of each through air drying cylinder. The loop of the fabricis divided in a web-carrying partand a conditioning part. The web-carrying part extends from a receiving pointto a transfer pointwhere a fibrous web is transferred to a further component. The conditioning part extends from the transfer pointto the receiving point. The conditioning part has a cleaning sectioncomprising a showerto wash residue from the fabric. A dewatering sectionis arranged to act on the fabricafter the cleaning section and comprises one or several suction dewatering devices. An applicator sectionis arranged in the conditioning partafter the dewatering section. The applicator section comprises an applicatorfor applying release agent on the fabric. The dewatering sectionof the fabric loop comprises a substantially vertical run VR of the fabric which does not deviate more than 30&#xb0; from a vertical plane and a suction dewatering deviceis placed along the vertical run of the fabricon the web-contacting side of the fabric. The dewatering section either comprises a further suction dewatering device placed along the vertical run of the fabric on the side of the fabricthat is opposite the web-contacting side or it has room for installing a further suction dewatering device of the same size as the suction dewatering devicethat is located on the web-contacting side of the fabric.

Drying section of a papermaking machine comprising one or more through air drying cylinders

The invention relates to a suction device () for use in a papermaking machine and being suitable for acting on a wet fibrous web through a permeable fabric (), e.g. a through-air-drying (TAD)-fabric. The suction device has a fabric-facing surface () formed by a plurality of end surfaces of solid elements (). Channels () are defined between the solid elements. The end surface of the final solid element () does not lie in the same plane as the end surfaces of the previous solid elements (). Thereby, a gap A is formed between the fabric () and the final solid element (). This allows air to flow through the gap and into a final channel (). The air flow will then catch fines, small fibers and water droplets and draw them into the final channel () thereby counteracting a build-up of large lumps of fines and fibers.

Suction device for use in a papermaking machine and a papermaking machine using a suction device

Growing community of inventors

Kil, Sweden

Mattias Johansson