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:
Jan. 17, 2006
Filed:
Sep. 13, 2002
Juha Ehrola, Vaajakoski, FI;
Juha Ehrola, Vaajakoski, FI;
Metso Paper, Inc., Helsinki, FI;
Abstract
A paper machine suction roll has a perforated shell () and a static suction box () sealed against the inner surface of the shell () to create a suction zone () on the roll surface as it rotates. Holes () extending through the shell () are placed at distances (b) of varying magnitude from one another such that the hole pattern formed on the inner surface of the shell () is irregular. Each hole () has a surrounding countersink situated at regular intervals (a) from one another forming a regular countersink pattern on the outer surface of the shell (). A conventionally drilled suction roll produces very powerful noise peaks at certain multiples of rotation frequency. When the position of the holes is changed at random in particular in the circumferential direction, regular periodicity disappears and the sound produced is a less disturbing humming-type sound.