Press Belt Support Element for Vibration Damping
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Solution Overview
Problem
In paper or paperboard production, presses with clothing-supported fibre webs experience detrimental interacting natural vibrations at specific machine speeds, leading to unstable web runs and amplitude issues, which existing support rails fail to adequately address.
Innovation Solution
The introduction of a support element arranged near the belt's loop, specifically within a defined distance upstream or downstream of the press zone, to dampen transversal vibrations and prevent interacting natural vibrations, using a support rail or resiliently deformable elements that can adjust radially or be positioned for optimal damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the belt and press blanket are allowed to run in conjunction upstream the press zone, then the web run is stable, but interacting natural vibrations occur at certain machine speeds causing detrimental amplitudes
Solution Approach 1:
The support rail is positioned upstream of the press zone to provide preliminary support to the belt before it enters the press zone. This preliminary action prevents the belt from participating in natural vibrations by providing early stabilization, thereby eliminating the harmful interaction between belt and press blanket vibrations while maintaining web run stability.
Solution Approach 2:
The support rail acts as an intermediary element between the belt and the press zone. It provides a controlled support point that mediates the interaction between the belt and press blanket, preventing direct harmful vibration transmission while allowing the belt to run in conjunction with the press blanket for web stability.
2Reliability
If a support rail is positioned upstream the press zone to control belt deflection, then belt support is improved, but interacting natural vibrations are not eliminated
Solution Approach 1:
The support rail provides preliminary support at a specific upstream position, stabilizing the belt before it reaches the press zone. This timing is critical - early enough to prevent vibration initiation, but positioned to maintain the belt's operational reliability and web run stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively eliminates detrimental vibrations, ensuring a stable web run and preventing amplitude issues, by providing targeted support to the belt and press felt, thereby enhancing operational stability and press performance.
Implementation Method 1
The introduction of a support element arranged near the belt's loop, specifically within a defined distance upstream or downstream of the press zone, to dampen transversal vibrations and prevent interacting natural vibrations
Data Source
AI summary
Press for a fiber web supported by a clothing, said press having first and second press elements that interact with each other in order to form an extended nip in a press zone for the clothing-supported fiber web, said first press element having: —a support; —a press body, being supported by the support; —an endless, flexible belt, sliding over and forming a closed loop around the press body; and —a support element, being placed inside the loop for supporting the belt, said clothing surrounding together with the belt between a first position and a second position along the loop, wherein at least the first position is located outside the press zone. According to the invention, the support element is located in the first position. The invention also relates to a method in, and a press element for such a press.