Metal Strip Coil Marking for Traceable Cut Section Identification
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Solution Overview
Problem
Existing methods for marking coils of metal strips fail to uniquely identify sections cut from the coil, especially on one flat side, leading to difficulties in tracing the origin and position of the strip sections after cutting, making it challenging to attribute them back to the original coil.
Innovation Solution
Implementing a de-Bruijn sequence-based information track along the entire length of the metal strip, which includes successive words that can be used to unambiguously identify the coil and the original position of the strip sections, facilitating visual and machine-readable tracing even after cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a simple marking is applied to the end of the coil, then the coil can be identified, but the marking is lost after cutting and sections cannot be traced
Solution Approach 1:
A de-Bruijn sequence is pre-applied to the entire length of the metal strip before cutting. This sequence contains all possible position information in advance, so that no matter where the strip is cut, the marking information is preserved on the remaining sections. The sequence is designed such that any substring of sufficient length uniquely identifies its position in the original strip.
2Reliability
If the entire strip is marked with position information, then cut sections can be traced, but the marking becomes complex and difficult to process
Solution Approach 1:
The marking system uses a de-Bruijn sequence with specific parameters (order k and word length n) to optimize the balance between information density and readability. By carefully selecting these parameters, the sequence achieves maximum information content while maintaining a regular, predictable structure that is easy to machine-read and visually verify.
Solution Approach 2:
The de-Bruijn sequence creates a self-similar structure where every position in the sequence contains encoded information about its location. This copying property allows any segment of the strip to carry information about its origin, enabling reliable tracing without requiring the entire original marking to be intact.
3Measurement precision
If a de-Bruijn sequence is used to mark the strip, then cut sections can be uniquely identified, but the marking requires more space and time to apply
Solution Approach 1:
The de-Bruijn sequence has a periodic structure with repeating patterns at different scales. This periodicity allows for efficient application using periodic marking processes, and enables quick verification by checking for the characteristic periodic patterns. The sequence can be applied continuously along the strip in a single pass.
Data Source
AI summary
A coil made of a coiled metal strip, in particular an aluminum strip, having a marking on a flat side of the metal strip. In order to be able, inter alia, to clearly identify the strip segments severed from the coil it is proposed that the marking, for allocating strip segments severed from the coil to the coil and the original position of the marking on the coil, comprises an information track, preferably extending across the entire strip length of the metal strip having a de-Bruijn sequence of successively arranged words of said de-Bruijn sequence or from a subset of the words of said de-Bruijn sequence.