Aerosol Article 3D Surface Profiling for Defect Detection
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Solution Overview
Problem
Detecting manufacturing defects in aerosol-generating articles, such as delamination, breaks, wrinkles, and stains, is difficult and time-consuming using traditional methods, requiring a more efficient and accurate approach for in-line process control.
Innovation Solution
A method involving the recording of 2-dimensional surface profiles while rotating the aerosol-generating article, combining these profiles to create a 3-dimensional surface profile, and calculating the maximum height difference to detect defects, with a threshold value for acceptance, using a 2-D/3-D laser profiler for simultaneous surface profiling and visual imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional visual detection methods are used to detect manufacturing defects, then the inspection process is simple, but the detection accuracy and reliability are insufficient for detecting multiple defect types
Solution Approach 1:
The patent transitions from 2D visual inspection to 3D surface profiling by recording surface height information. The 3D surface profile controller combines multiple 2D surface profiles taken at different rotation angles to create a comprehensive 3D representation, enabling detection of defects based on height deviations from the nominal surface, thereby improving detection accuracy without requiring overly complex multi-sensor systems.
Solution Approach 2:
The patent replaces traditional mechanical contact-based surface measurement methods with optical surface profiling using lasers. The surface profile sensor records surface profiles optically, and the 3D surface profile controller processes these optical measurements to generate 3D models, eliminating the need for complex mechanical scanning systems while maintaining high precision.
2Reliability
If multiple defect types are detected using traditional methods, then comprehensive inspection is achieved, but the inspection time increases significantly
Solution Approach 1:
The patent merges multiple inspection functions into a single 3D surface profiling system. By combining height measurement, surface topology analysis, and defect classification into one integrated system controlled by the 3D surface profile controller, the patent achieves comprehensive defect detection across multiple defect types simultaneously, maintaining high reliability while improving inspection speed through unified processing.
Solution Approach 2:
The patent changes the inspection parameter from visual intensity analysis to surface height measurement. By measuring vertical deviations in surface height rather than analyzing visual characteristics, the system can detect various defect types (wrinkles, delamination, stains) through a single height-based metric, enabling fast parallel processing that maintains reliability while significantly improving productivity.
3Measurement precision
If 3D surface profiling is implemented for comprehensive defect detection, then detection accuracy improves, but the complexity of the inspection process increases
Solution Approach 1:
The patent implements self-service through automated 3D surface profile generation and analysis. The 3D surface profile controller automatically combines multiple 2D surface profiles, generates 3D models, compares them against nominal surfaces, and identifies defects without requiring manual intervention or complex operator judgment, maintaining high precision while simplifying operation through full automation.
Solution Approach 2:
The patent performs preliminary action by pre-storing nominal surface profiles and comparison criteria in the 3D surface profile controller. During inspection, measured surface profiles are automatically compared against these pre-established reference profiles, enabling precise defect detection through automated deviation analysis without requiring complex real-time decision-making or manual calibration procedures.
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 method allows for the accurate and rapid detection of various manufacturing defects, including those difficult to identify visually, enabling effective in-line process control during production, ensuring quality by rejecting articles with height differences above a threshold.
Implementation Method 1
using a 2-D/3-D laser profiler for simultaneous surface profiling and visual imaging
Data Source
AI summary
The invention relates to a method for checking an aerosol-generating article for manufacturing defects, comprising: —recording several 2-dimensional surface profiles of the aerosol-generating article while rotating the aerosol-generating article, —combining several surface profiles recorded at different rotation angles to obtain a 3-dimensional surface profile, calculating a maximum height difference of the 3-dimensional surface profile, and —rejecting the aerosol-generating article if the maximum height difference of its 3-dimensional surface profile is above a threshold value.