Metal Web Splicing at Standstill With Loop Storage Continuity
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Solution Overview
Problem
Existing methods for connecting metal-containing material webs of finite length to form an endless web for uninterrupted production result in weak connections and significant material waste due to the short connection time and inefficient cutting processes, leading to residual strips and increased material costs.
Innovation Solution
A device and method where the connecting station positions the material web ends at a standstill, allowing for a secure connection with multiple welding points and precise cutting to minimize residual material, using a loop storage to ensure continuous supply and reduce waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If material webs are joined while moving in known devices, then continuous production is maintained, but the connection strength is insufficient and only single welding points can be made
Solution Approach 1:
A loop buffer acts as an intermediary storage element between the joining station and downstream processing. It decouples the joining operation from continuous material flow, allowing the material webs to be stationary during joining while the loop buffer maintains continuous supply to downstream stations. This mediator enables both strong connections (through stationary multi-point welding) and continuous production (through buffer compensation).
Solution Approach 2:
The loop buffer is pre-filled with material webs before the joining operation begins. This preliminary storage of material allows the system to pause at the joining station without interrupting downstream production, enabling the material webs to be positioned and joined stationary while maintaining overall process continuity.
2Strength
If material webs are joined at a standstill with multiple welding points, then connection strength is improved, but production downtime occurs
Solution Approach 1:
The loop buffer serves as a mediator that absorbs the time discrepancy between stationary joining operations and continuous downstream processing. While material webs are joined at a standstill with multiple welding points for enhanced strength, the loop buffer releases stored material to keep downstream stations running, eliminating visible production downtime.
Solution Approach 2:
The loop buffer is filled in advance with sufficient material to cover the entire joining operation duration. This beforehand cushioning of material supply ensures that even though joining takes longer due to multiple welding points, downstream production is never interrupted, as the buffer provides a cushion that bridges the time gap.
3Reliability
If leader and trailer lengths are increased for secure positioning and joining, then joining reliability is improved, but material waste increases significantly
Solution Approach 1:
Magnetic positioning devices replace traditional mechanical clamping systems that required long leader and trailer sections for secure gripping. The magnetic field provides sufficient holding force with minimal material extension, enabling reliable positioning and joining with dramatically reduced leader and trailer lengths, thus minimizing material waste while maintaining joining reliability.
Data Source
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AI summary
The invention relates to a device (10) designed and configured for joining two material webs (A, B) of finite length, each unwinding from a bobbin (B1, B2), to form an endless material web (C) usable for uninterrupted production, comprising means for supplying the first bobbin (B1) with the first material web (A) of finite length and for supplying the second bobbin (B2) with the second material web (B) of finite length, conveying means (12, 13) for conveying the material webs (A, B) of finite length in conveying direction (T1) and (T2) respectively into a joining station (14) and the endless material web (C) formed therein in conveying direction (T3) to a downstream processing station, the joining station (14) for joining the material webs (A) and (B) of finite length to form the endless material web (C) together,namely, a trailing end (E1) of the first material web (A) of finite length with a leading end (E2) of the second material web (B) of finite length, forming an overlap area (15), wherein the joining station (14) comprises a positioning device (16) for positioning the ends (E1, E2) of the two material webs (A, B) of finite length to be joined within the joining station (14), which is characterized in that the joining station (14) with the positioning device (16) is designed and configured for joining the two ends (E1, E2) of the metal-containing material webs (A, B) of finite length when the two ends (E1, E2) are at rest, and additionally a loop storage unit (17) is provided into and from which the endless material web (C) formed in the joining station (14) can be conveyed. The invention further relates to a corresponding method.