Patent
Method in the roll operation of a paper machine and installation for the method
TLDR
In this article, a method and an installation in the roll operation of a paper machine is described, where the position of the critical speed ranges u KR, u 1/2 KR of the roll is adjusted whilst running the roll.Abstract:
The invention relates to a method and an installation in the roll operation of a paper machine. In order to prevent vibration of the roll in the critical speed ranges, the position of the critical speed ranges u KR, u 1/2KR of the roll is adjusted whilst the roll is running.read more
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Patent
Method and device for changing the natural frequency of a nip roll construction in a paper or board machine
Holopainen Kari,Ehrola Juha +1 more
TL;DR: In this article, a method for changing the natural frequency of a nip roll construction in a paper or board machine was proposed, in which the bearing elasticity of a hydrostatic bearing element (10, 20, 30, 40) of at least one roll (1) was changed, and the connection between the roll and the pressure medium accumulator (39) was also changed.
Patent
Support arrangement of roll in fibrous-web machine
TL;DR: In this paper, a support arrangement of a roll of a fibrous-web machine is described, which comprises a first frame part (12) in which the roll is supportable from its end when in use and a second frame part(22) is fastened by means of an elastic fastening.
Patent
Method for reducing vibrations of rotary cylinder of printing machine, involves changing resonance frequency of cylinder by inserting or diverting of matters into interior of cylinder or from interior of cylinder
Ehrt Tobias,Noeth Thomas +1 more
TL;DR: In this paper, a method for changing a resonance frequency of a rotary cylinder by inserting or diverting of matters (12,27) into the interior of the cylinder was described.
Patent
Arrangement for attenuating vibration of a roll assembly
Marko Jorkama,Kimmo Penttila +1 more
TL;DR: In this article, an arrangement of attenuating the vibration in a roll assembly of a fiber web machine, in which assembly the roll (10) being rotatably suspended at its end on bearings in bearing housings (13a, 13b), and the bearing housing being supported on the frame or the foundation of the machine via viscoelastic intermediate piece or pieces (21a, 21b).
Patent
Method and device for changing the natural frequency of a nip roll construction in a paper or board machine
TL;DR: In this paper, a method and a device for changing the natural frequency of a nip roll construction in a paper or board machine so that the rigidity of one or several loading elements, for example loading cylinder or loading beam, in the nip-roll construction is varied.