Suction roll of a paper machine

Details Suction roll of a paper machine Suction roll of a paper machine

2006-01-17

2006-01-17

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

C162S369000, C162S370000, C162S371000

Reexamination Certificate

active

06986831

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.

REFERENCES:
patent: 2964107 (1960-12-01), Walker
patent: 37473 (1970-10-01), None
patent: 736149 (1955-09-01), None
Search Report issued in Finnish Priority Application No. 20011823, d. May 27, 2002.

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