The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 1990
Filed:
Mar. 09, 1989
Allan Liedes, Palokka, FI;
Markku Karlsson, Parainen, FI;
Valmet Paper Machinery Inc., , FI;
Abstract
Method and device in a drying group or groups provided with a single wire draw, in a multi-cylinder dryer of a paper machine for securing the threading of the web. The multi-cylinder dryer has drying cylinders heated by steam or equivalent, with the web to be dried being pressed by the drying wire into direct contact with cylinder faces of the drying cylinders. The multi-cylinder dryer also has leading cylinders or rolls on which the web remains outside the drying wire. In the area of single-wire draw, the leading cylinders or rolls are provided with a suction zone situated at a side of the service-side end of the rolls. The suction zone is provided by way of perforations passing through a mantle of the leading cylinders or rolls. The negative pressure present in an interior space in the leading cylinders is spread onto the outer faces thereof through the perforations and by way of grooves situated within the area of the suction zone and passing around the roll mantle. The sector of the leading cylinders or rolls that remains free from the drying wire and from the web, is closed over the suction zone by way of an outer closing arrangement.