Coating Cure Monitoring with Pattern Reflection for Sagging Detection
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Solution Overview
Problem
Existing methods for monitoring the drying and curing process of coatings in the automotive industry fail to replicate real conditions and do not effectively detect or minimize surface and optical defects, such as sagging, in coatings applied in automotive OEM or refinish manufacturing.
Innovation Solution
A device comprising a movable skid with a substrate holding unit, light source, pattern holder, and camera is used to monitor the drying and curing process, allowing for the evaluation of surface and optical defects by recording reflection images and performing Fourier transformation analysis on the images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a transparent oven with glass walls is used to monitor the drying and curing process, then the coating surface can be observed during the process, but the monitoring conditions do not resemble real automotive manufacturing conditions and safety regulations cannot be met
Solution Approach 1:
A camera system is introduced as an intermediary device to observe the coating process through the oven wall without compromising the oven's integrity or the realism of the drying conditions. The camera captures images of the coating surface during drying and curing, allowing monitoring while maintaining authentic manufacturing conditions inside the oven.
Solution Approach 2:
Instead of directly observing the coating process through transparent walls, the invention creates optical copies (images) of the coating surface using a camera system. These images can be analyzed later to detect defects such as sagging, providing monitoring capability without altering the actual process conditions.
2Manufacturing precision
If traditional oven drying is used to cure coatings, then the coating achieves proper drying and curing, but surface defects such as sagging occur due to evaporation and crosslinking processes
Solution Approach 1:
The camera system performs preliminary documentation of the coating surface during the drying process before defects fully develop. By capturing images at various stages, the system allows for early detection of sagging tendencies, enabling potential process adjustments before final curing completes.
Solution Approach 2:
The imaging system provides feedback on the coating surface condition during drying and curing. This information can be used to adjust drying parameters or coating application to minimize defect formation, creating a closed-loop system that actively prevents sagging and appearance defects.
3Measurement precision
If a movable skid with integrated lighting and imaging system is used, then detailed surface monitoring is achieved under controlled lighting conditions, but the device complexity increases
Solution Approach 1:
The lighting system, camera, and positioning mechanisms are merged into a single movable skid assembly. This integrated design allows the entire monitoring system to be moved into position, reducing the need for separate fixed installations and simplifying the overall system architecture while maintaining measurement precision.
Solution Approach 2:
The skid is designed to be movable rather than fixed, allowing dynamic positioning to optimize imaging angles and lighting conditions for different inspection scenarios. This dynamic capability enhances measurement precision while avoiding the complexity of multiple fixed monitoring stations.
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
The device provides insights into the drying and curing process, enabling the detection and minimization of defects like sagging, and is applicable in research, development, and troubleshooting for clearcoat and other coating compositions.
Implementation Method 1
at least one lamp (3) used as light source, wherein substrate holding unit (2), lamp (3) and pattern holder (4) are positioned on skid (1) relative to each other such that light of lamp (3) can illuminate the pattern of pattern holder (4), and after said illumination can be projected onto the surface of the substrate
Implementation Method 2
camera (5) is positioned on the skid (1) relative to substrate holding unit (2) holding the substrate, such that camera (5) is capable of recording images of the light reflected off the surface of said substrate
Data Source
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AI summary
The present invention relates to a device for monitoring the drying and/or curing process of a coating composition applied at least partially onto at least one surface of a substrate, said device comprising a movable skid (1), which skid (1) in turn comprises at least one substrate holding unit (2), at least one lamp (3) used as light source, at least one pattern holder (4) including a pattern, as well as at least one camera (5), wherein substrate holding unit (2), lamp (3) and pattern holder (4) are positioned on skid (1) relative to each other such that light of lamp (3) can illuminate the pattern of pattern holder (4), and after said illumination be projected onto the surface of the substrate, which is held by the substrate holding unit (2), and wherein camera (5) is positioned on the skid (1) relative to substrate holding unit (2) holding the substrate, such that camera (5) is capable of recording images of the light reflected off the surface of said substrate, a use of said device for monitoring the drying and/or curing process of a coating composition applied onto the surface of a substrate, a corresponding method making use of said device as well as a kit-of- parts comprising the device and an oven, as well as to a method of evaluating appearance properties and/or surface properties of a coating obtained by applying the coating composition during drying and/or curing.