Unwinder Movable Rail Transfer for Off-Center Fiber Web
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Solution Overview
Problem
Existing unwinder systems with two unwinding stations face difficulties in horizontal movement of the machine roll in axial direction, particularly when the fiber web is not centered or oscillated, leading to challenges in transferring the roll between stations without breaking the web.
Innovation Solution
Incorporating movable and inclinable rail parts that allow the machine roll to be transferred between unwinding stations without requiring centering, using a drive and/or brake device to control web tension during transfer, enabling axial movement of the machine roll between non-centered stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the machine roll is transferred between unwinding stations without centering, then the transfer process is simplified and continuous operation is maintained, but the web may break during transfer if the roll is not properly positioned
Solution Approach 1:
The patent introduces an intermediary positioning mechanism (movable rail parts with inclinable sections) that temporarily supports and guides the machine roll during transfer between unwinding stations. This mediator enables non-centered transfer while maintaining web integrity through controlled support and tension management.
Solution Approach 2:
The patent employs dynamic elements including movable rail parts that can change position and inclination angle during the transfer process. The drive and brake devices dynamically adjust web tension to accommodate the changing position of the machine roll, enabling continuous operation without web breakage.
2Adaptability or versatility
If the machine roll is moved in axial direction between non-centered stations, then the unwinder can handle oscillated or off-center webs, but the transfer mechanism becomes more complex
Solution Approach 1:
The transfer mechanism is divided into separate functional segments: fixed rails for support, movable rail parts for positioning adjustment, and inclinable sections for angle control. This segmentation allows each component to perform its specific function independently, managing complexity while enabling versatile handling of off-center webs.
Solution Approach 2:
The movable and inclinable rail parts serve multiple functions: supporting the machine roll, adjusting its axial position, controlling transfer angle, and maintaining web tension. This multi-functionality reduces the need for separate dedicated components, managing overall system complexity while achieving adaptability.
3Reliability
If the web tension is controlled during transfer using drive and brake devices, then web breakage is prevented, but the control system becomes more complex
Solution Approach 1:
The drive and brake devices are combined into an integrated control system that manages web tension during transfer. By merging these functions into a coordinated system rather than separate independent mechanisms, the patent achieves reliable web tension control while managing overall control complexity through unified management.
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
Enables seamless transfer of the machine roll between unwinding stations without web breakage, allowing for continuous unwinding operations even when the roll is not centered, thus enhancing the unwinder's capacity and efficiency.
Implementation Method 1
a drive and/or brake device, which is arranged to follow the transfer equipment while it moves, for controlling the tension of the web
Data Source
AI summary
The invention relates to a method in connection with an unwinder (5) for a fiber web(W), according to which method a machine roll (10) is unwound to a fiber web (W) in the unwinder (5) and in which method the machine roll (10) is unwound in a first unwinding station of the unwinder (5) on first rails (17) down to a certain diameter and the machine roll (10) is unwound in a second unwinding station of the unwinder (5) on second rails (16) down from the certain diameter. The machine roll (10) is transferred from the first unwinding station on the first rails (17) to the second unwinding station on the second rails (16) during unwinding such that at least once during transferring the machine roll (10) is moved in its axial direction (S) while supported on movable / inclinable rail parts (15) between the first and the second rails (17; 16). The invention also relates to an arrangement in connection with an unwinder (5) for a fiber web(W), which unwinder (5) comprises a first unwinding station on first rails (17) for unwinding a machine roll (10) down to a certain diameter and a second unwinding on second rails (16) for unwinding the machine roll (10) down from the certain diameter. The unwinder (5) further comprises movable / inclinable rail parts (15) between the first rails (17) and the second rails (16) which first and second rails (17; 16) are not located on the same longitudinal line for providing transferring of the machine roll (10) from the first unwinding station on the first rails (17) to the second unwinding station on the second rails (16) during unwinding such that at least once during transferring the machine roll (10) is moved in its axial direction (S) while supported on movable / inclinable rail parts (15).