Fabric Oscillation Control for Fiber Web Machines
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Solution Overview
Problem
In fiber web machines, the constant amplitude oscillation of fabrics leads to uneven wear and edge damage, causing web breaks due to the fabric shifting and deforming, resulting in points of discontinuity where the web has not been before, leading to edge damage and web breaks.
Innovation Solution
The method involves shifting one end of a guide roll in the machine direction to maintain a high oscillation amplitude, ensuring the web's area of impact is wider than the fabric's width throughout its lifetime, preventing edge damage by keeping the web on previously used areas and dynamically adjusting oscillation based on fabric width changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant amplitude oscillation is applied to the fabric, then uneven wear of rolls is prevented, but edge damage and web breaks occur due to points of discontinuity
Solution Approach 1:
The patent applies dynamic oscillation where the amplitude is continuously adjusted based on the fabric's instantaneous position and width. The oscillation system transitions from static constant amplitude to dynamic variable amplitude, allowing the fabric to be kept within safe zones that avoid points of discontinuity while still preventing uneven roll wear through continuous movement.
Solution Approach 2:
The oscillation amplitude is changed as a parameter based on fabric width variations and position. The control system monitors fabric width and adjusts oscillation amplitude dynamically, changing the parameter to match actual fabric conditions rather than maintaining a fixed amplitude, thereby avoiding edge damage while preventing roll wear.
2Adaptability or versatility
If fabric width varies during operation, then manufacturing flexibility is improved, but oscillation control becomes difficult leading to web breaks
Solution Approach 1:
The patent implements a feedback control system that continuously monitors fabric width and uses this information to adjust oscillation amplitude in real-time. The control device receives feedback about fabric dimensions and modifies oscillation parameters accordingly, ensuring the fabric remains within safe operational zones even as width varies during manufacturing.
Solution Approach 2:
The oscillation system dynamically adapts to changing fabric width conditions. Rather than using fixed oscillation parameters, the system continuously adjusts amplitude based on real-time fabric measurements, allowing flexible handling of width variations while maintaining web integrity through adaptive control.
Data Source
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AI summary
The invention relates to a method in a fiber web machine. In the method, a fabric (12) included in the fiber web machine is used for supporting a web (14) produced by the fiber web machine. Moreover, in the method the location of the fabric (12) is changed in the cross direction (CD) of the fiber web machine. The location is changed by means of oscillation, the amplitude (19) of which is kept so high that the area of impact (20) of the web (14) on the fabric (12) is wider than the width (21) of the web (14) throughout the lifetime of the fabric (12). The invention also relates to an arrangement in a fiber web machine, and to a software product.