Laser Label Cutting Compensation for Ink Thickness Variation
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Solution Overview
Problem
Laser cutting of biaxially oriented polypropylene (BOPP) face stock and adhesive layers is challenging due to sensitivity to laser power and speed, leading to potential burning through the liner and issues with non-uniform ink thickness and composition affecting cut precision.
Innovation Solution
A label printing and cutting system that digitally processes the label image to determine precise laser power and cut speed based on ink thickness, reflectivity, and location, ensuring accurate cutting through the face stock and adhesive without damaging the liner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser power is increased to ensure cutting through thick ink, then cutting capability improves, but the liner may be damaged and structural integrity compromised
Solution Approach 1:
The laser power is dynamically adjusted based on the local ink thickness at each position along the cut line. The system analyzes ink thickness data and applies higher power only where ink is thicker, while using lower power where ink is thinner, thereby achieving consistent cutting without damaging the liner.
Solution Approach 2:
The laser power setting is made dynamic rather than static. The system continuously adjusts laser power in real-time based on feedback from ink thickness measurements, allowing the cutting parameters to adapt to varying ink conditions along the cut path.
2Manufacturing precision
If laser cut speed is decreased to improve cut quality, then cutting precision improves, but productivity decreases
Solution Approach 1:
The laser cut speed is dynamically adjusted based on local ink thickness. The system moves the laser slower through areas with thicker ink to ensure complete cutting, while maintaining higher speed through areas with thinner ink, thereby achieving both high cut quality and maintained productivity.
Solution Approach 2:
The system changes the cutting parameters (power and speed) based on the measured ink thickness. By linking parameter adjustments to actual ink conditions, the system optimizes the balance between cut quality and production speed.
3Device complexity
If uniform laser power is used across the entire cut line, then device complexity is reduced, but cutting precision deteriorates due to varying ink thickness
Solution Approach 1:
The system performs preliminary analysis of the ink thickness along the entire cut line before actual cutting begins. Based on this pre-analysis, it creates a customized power profile that will be applied during cutting, ensuring precision without requiring complex real-time adjustments during the cutting process itself.
Solution Approach 2:
The system creates a digital model or profile of the ink thickness distribution along the cut line, then uses this copied information to guide laser power adjustments. This allows the system to compensate for ink variations without adding significant physical complexity to the laser apparatus.
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 precise cutting of labels with varying ink thickness and composition, maintaining liner integrity and ensuring accurate application of labels without defects.
Implementation Method 1
the laser can burn though the BOPP and the adhesive and into the liner. Burning into the liner damages the structural integrity of the liner
Implementation Method 2
A little too much power from the laser, which can result from too high of a power setting for the laser or too slow of a cut speed
Data Source
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AI summary
Apparatuses and embodiments related to compensated laser cutting of labels. A computer system receives an image of a label, and rasterizes the image. The computer system determines how much of each type of printer ink of a label printer to deposit at each pixel location of the image. The computer system determines which pixels intersect a cut line, and determines the characteristics of the ink of the pixels, such as the quantity or thickness of the ink at the pixel locations. The computer system determines laser data including power, cut speed, and/or frequency of a laser that is tuned to accurately cut through the ink that forms the image, the material(s) of the label, and the adhesive that removably adheres the label to base material(s), but to not excessively damage the base material(s). A laser cutting system uses the laser data to control a laser.