Suction roll of a paper machine
US6986831B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 2002 |
| Grant date | Jan 17, 2006 |
| Priority date | — |
| Expiry date | Aug 7, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F3/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A paper machine suction roll has a perforated shell (10) and a static suction box (11) sealed against the inner surface of the shell (10) to create a suction zone (11a) on the roll surface as it rotates. Holes (14) extending through the shell (10) are placed at distances (b1) of varying magnitude from one another such that the hole pattern formed on the inner surface of the shell (10) is irregular. Each hole (14) has a surrounding countersink situated at regular intervals (a) from one another forming a regular countersink pattern on the outer surface of the shell (10). 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.