Laser-Marked Can Tabs for High-Speed Matrix Barcode Reading
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Solution Overview
Problem
Conventional methods for marking metal cans, particularly pull tabs, face challenges in achieving high-speed and high-resolution decoration, with existing technologies struggling to efficiently produce readable barcodes on moving substrates within the constraints of high-speed manufacturing processes.
Innovation Solution
A laser marking process that forms matrix barcodes by creating through-holes in a coating on metal can components, such as can ends and pull tabs, using a handheld wireless communication device-readable inverse barcode design, allowing for precise and high-resolution marking even on moving substrates, with the ability to form barcodes on stationary or moving tab stock during the dwell period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser etching or ablation methods are used on pull tabs, then marking can be achieved, but the process cannot achieve high-speed and high-resolution decoration simultaneously
Solution Approach 1:
The patent employs periodic pulsed laser action to create matrix barcodes by forming individual dots through the coating in a systematic pattern. The laser delivers controlled pulses that remove coating material to create light-colored dots on the dark tab surface, with each dot formed by a specific number of pulses (e.g., 1-5 pulses per dot). This periodic action enables both high resolution (through precise dot placement and sizing) and high speed (through efficient coating removal and rapid dot formation), achieving the dual goal of quality and productivity in tab marking.
2Productivity
If laser marking is performed on moving tab stock during dwell period, then high-speed manufacturing is maintained, but marking precision and resolution become difficult to achieve
Solution Approach 1:
The patent applies preliminary action by marking the matrix barcode on the tab stock during the dwell period—when the tab is stationary or moving slowly between pressing operations. This timing allows the laser to form precise dots without the complications of high-speed motion, ensuring high resolution marking. The dwell period is utilized efficiently to perform the marking operation before the tab enters the high-speed forming cycle, thus maintaining both productivity and precision.
3Manufacturing precision
If through-holes are created in the coating to form inverse barcodes, then high-resolution marking is achieved, but additional process steps and complexity are introduced
Solution Approach 1:
The patent applies the extraction principle by removing (taking out) the coating material through laser ablation to create light-colored dots that form the inverse matrix barcode. Instead of adding material or using complex multi-step processes, the invention extracts the dark coating to reveal the lighter substrate, creating high-contrast, easily readable barcodes. This approach simplifies the overall process while achieving superior barcode clarity and resolution, as the inverse design (light dots on dark background) is inherently more readable by standard scanners.
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 high-speed, high-resolution decoration of can components, achieving readable matrix barcodes on can ends and pull tabs, with the capability to produce complex codes like 14x14 data matrix codes within 55 milliseconds, suitable for modern tab making operations, enhancing the accuracy and efficiency of marking in high-speed manufacturing environments.
Implementation Method 1
A process for high speed, high resolution decoration by laser marking for can components... applying a laser to produce dots on a panel region of a metal substrate... forming a through hole in the coating by applying the laser
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1E
AI summary
A matrix barcode on a can component, such as a can end panel, a pull tab of a can end, or the coil stock, is formed by laser application that makes spots that represent the matrix barcode modules.