Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Reexamination Certificate
2005-06-28
2005-06-28
Fortuna, José A. (Department: 1731)
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
C162S198000, C162S263000, C162S272000, C248S562000, C248S569000, C248S636000, C248S638000, C267S136000
Reexamination Certificate
active
06911117
ABSTRACT:
A method and apparatus for damping vibration in a paper machine. The apparatus having a dynamic damper which includes a weight suspended by a spring. The spring constant of the spring is changed by means of a control device in order to tune the natural frequency of the dynamic damper. The dynamic damper is tuned to a frequency that is substantially equal to a multiple of the rotational frequency of the roll in the paper machine that is being damped.
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Hietamäki Erkki
Karhunen Jouko
Köliö Jorma
Lehtovirta Esa
Puranen Arto
Fortuna Jos'e A.
Metso Paper Inc.
Mizaki B.
Steinberg & Raskin, P.C.
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