Conductive Reel-Up Belt for Static Dissipation in Paper Winding
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Solution Overview
Problem
Existing paper reel-up systems face challenges in uniformly winding paper webs due to inadequate control of nip pressure and adherence issues, particularly with tissue paper, which can lead to non-uniform rolls and affected paper properties, and are further complicated by static electricity and dust interference in creping environments.
Innovation Solution
A reel-up system utilizing an endless flexible belt made of electrically conductive material that dissipates static electricity and features a permeable design with air suction to ensure consistent adherence, combined with a deflection sensor and actuator for controlled belt positioning to maintain uniform winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible belt is used to engage the paper web against the reel spool, then adherence control is improved, but static electricity buildup occurs causing web instability
Solution Approach 1:
The belt material's electrical properties are changed from insulating to conductive by incorporating conductive elements (carbon black, metal fibers, or conductive coatings). This parameter change allows the belt to dissipate static electricity while maintaining mechanical flexibility and adherence control, simultaneously resolving both the reliability improvement and harmful static electricity accumulation.
2Stability of the object's composition
If strong adherence between web and belt is achieved, then web stability is improved, but web transfer to reel spool becomes difficult
Solution Approach 1:
The belt's adherence properties are made dynamic and adjustable rather than fixed. By incorporating adjustable parameters such as belt speed variation, tension control, or adjustable static charge levels, the system can optimize adherence during winding and facilitate easy transfer during spooling, resolving the contradiction between web stability and transfer ease.
Solution Approach 2:
The adherence parameters of the belt are made variable through control of static electricity levels, belt tension, or surface properties. This allows the system to adjust adherence strength dynamically - strong when needed for stability, weak when needed for transfer - resolving the contradiction between web stability and ease of transfer.
3Manufacturing precision
If nip pressure is increased to ensure uniform winding, then winding uniformity is improved, but paper properties are affected negatively
Solution Approach 1:
The flexible conductive belt acts as an intermediary between the reel spool and the paper web. It provides controlled adherence through electrostatic and mechanical means, enabling uniform winding at reduced nip pressures. The belt distributes pressure more evenly and prevents web slippage without requiring excessive force, thus achieving winding uniformity while protecting paper properties.
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
The solution provides reliable and predictable adherence of the paper web to the belt, reducing static-related disturbances and ensuring uniform roll formation, even in dusty creping environments, by dissipating static electricity and using air suction, thus improving the control and quality of the winding process.
Implementation Method 1
the flexible belt comprises electrically conductive material such that static electricity in the flexible belt is dissipated away from the flexible belt
Implementation Method 2
features a permeable design with air suction to ensure consistent adherence
Data Source
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AI summary
The invention relates to a reel-up (2) for receiving and winding into a roll (3) a paper web (W) that arrives from a drying cylinder (17) in a paper making machine (1). The reel-up (2) comprises a rotatably mounted reel spool (4) onto which a paper web (W) can be wound to create a paper roll (3) of increasing diameter and an endless flexible belt (5) mounted for rotation along a predetermined path of travel such that the flexible belt (5) forms a loop. The flexible belt (5) is positioned adjacent to the reel spool (4) to engage the paper web (W) against the reel spool (4) during winding such that the flexible belt (5) is deflected from the predetermined path of travel. According to the invention, the endless flexible belt (5) comprises electrically conductive material such that static electricity in the flexible belt (5) is dissipated away from the flexible belt (5). The invention also relates to a paper making machine in which the inventive reel-up is used and to a method of winding a paper web.