Wet-on-Wet Metal Coating for Extra Layers Without Line Expansion
Solution Overview
Problem
Existing production lines for coated metals face limitations in adding additional functionality due to space constraints, preventing the integration of additional roller-coaters and curing ovens, necessitating a method to incorporate extra layers without significant equipment changes.
Innovation Solution
A method and system for applying a second coating layer on a wet first layer and simultaneously curing both layers, allowing for additional functionality without requiring additional manufacturing equipment or extensive line modifications, using spray coaters and simultaneous curing techniques like oven, e-beam, or UV curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional roller-coaters and curing ovens are added to the production line, then additional functionality can be provided, but space constraints prevent this
Solution Approach 1:
The patent combines the application of multiple coating layers and their curing processes into a single integrated operation. Multiple coating layers are applied in sequence to the metal substrate while the previous layer is still wet, followed by simultaneous curing of all layers in one curing oven, thereby providing additional functionality without requiring separate equipment for each layer.
Solution Approach 2:
The curing oven is designed to perform multiple functions: it cures multiple coating layers simultaneously, replaces the need for separate curing ovens for each layer, and accommodates the wet-on-wet coating process. This multi-functional approach maximizes the utilization of existing production line equipment.
2Reliability
If traditional sequential coating and curing is used, then each layer is properly cured, but production time increases
Solution Approach 1:
The patent merges multiple curing operations into a single simultaneous curing process. All coating layers are cured together in one curing cycle within the curing oven, ensuring proper curing quality for each layer while significantly reducing the total production time compared to sequential curing of each layer individually.
3Ease of manufacture
If wet-on-wet spray coating is used, then additional layers can be applied without additional equipment, but coating uniformity may be affected
Solution Approach 1:
The patent uses the wet state of the previously applied coating layer as an intermediary medium that facilitates the application of subsequent layers. The wet layer acts as a receptive base that allows spray coating to be applied uniformly without requiring additional equipment, maintaining coating uniformity while simplifying the manufacturing process.
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 the incorporation of additional properties such as antimicrobial, decorative, or reflective layers with reduced curing times, enhancing product functionality while minimizing production time and equipment adjustments.
Implementation Method 1
spraying a second coating layer on top of the first coating layer while the first coating layer is wet
Implementation Method 2
spraying a second coating layer on top of the first coating layer while the first coating layer is wet
Implementation Method 3
curing the first and second coating layers simultaneously
Implementation Method 4
curing the first and second coating layers simultaneously
Data Source
Figure 1~2
Figure 3A~3D
Figure 4
AI summary
A method of coating a metal substrate is disclosed. The method comprises: applying a first coating layer to the metal substrate; spraying a second coating layer on top of the first coating layer while the first coating layer is wet; and curing the first and second coating layers simultaneously.