Drying Belt Web Transfer via Suction Roller
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Solution Overview
Problem
Existing methods for transferring a material web from a drying arrangement to a collecting device are inefficient, especially when the material web is not in direct contact with the drying cylinder or is oriented against the direction of gravity, leading to instability and potential loss during transfer.
Innovation Solution
A method involving a suction-removable roller to hold and guide the material web on a drying belt, allowing it to be transferred safely and securely into a collecting device, even when the web is not in direct contact with the drying cylinder, by creating a holding area and release area with negative pressure, ensuring a defined take-off position and minimizing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the material web is transferred by removing it from the drying cylinder directly, then the transfer process is simple, but this is not possible or only possible against the direction of gravity in certain drying arrangement configurations
Solution Approach 1:
The invention introduces an intermediary transfer belt that acts as a mediator between the drying cylinder and the collecting device. The transfer belt receives the material web from the drying cylinder surface and conveys it to the collecting device, enabling transfer in configurations where direct removal would be impossible or gravity-opposed. This intermediary mechanism resolves the contradiction by decoupling the transfer function from the drying function.
2Productivity
If the material web is guided into the collecting device without support on the drying belt, then the transfer path is shorter, but the material web becomes unstable and may be lost during transfer
Solution Approach 1:
The invention applies preliminary action by creating a defined holding area on the transfer belt where the material web is temporarily secured before final transfer to the collecting device. This holding area ensures the web is stabilized and positioned correctly, preventing loss during transfer while maintaining an efficient transfer path. The web is held in a controlled manner until the transfer moment arrives.
3Productivity
If a lead-in strip is transferred to minimize production loss, then operating speed is maintained, but the remaining web must be guided into the collecting device which can cause instability
Solution Approach 1:
The invention applies local quality by providing different support conditions for different parts of the material web during transfer. The transfer belt provides localized support and stabilization specifically in the transfer zone where the web is most vulnerable, while allowing other sections to maintain their normal configuration. This localized intervention ensures stability during the critical transfer phase without affecting the overall web structure.
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 enables safe and stable transfer of the material web into a collecting device, reducing production losses and maintaining operating speed during disruptions, even in configurations where removal from the drying cylinder is not feasible or is against the direction of gravity.
Implementation Method 1
the material web or the partial strip being held on the drying belt by negative pressure over at least a partial area of the holding area
Data Source
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AI summary
The invention relates to a method for transferring a material web, in particular a fibrous web (F) in the form of a paper, cardboard, or tissue web, from a drying arrangement (1) in a machine (26) for producing such a material web to a functional unit (4) located downstream of the drying arrangement (1) when starting up the machine or following a disruption by transferring a guiding strip (AS). In the drying arrangement (1), the material web is supported on a continuously revolving drying belt (3) and is alternately guided over a plurality of heatable drying cylinders (TZn, TZn-1, TZn-2, TZn-3) and intermediate deflection rolls (5), the web being in direct contact with the surface of the drying cylinders. In one stage of said method, at least one partial strip of the material web from the drying arrangement (1) or the entire width of the material web is guided into a catching device arranged below the drying arrangement (1). The invention is characterized in that downstream of the last drying cylinder (TZn) of the drying arrangement (1) in the direction of travel of the material web through the drying arrangement (1), the material web or the partial strip of the material web is supported on the drying belt (3) and is guided into a catching device that is offset in the vertical direction.