Wet-on-Wet 3C2B Coating Facility with Sequential Baking Zones
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Solution Overview
Problem
The existing 3C2B coating method faces challenges in achieving a smooth coating film surface and satisfactory appearance due to difficulties in controlling the fluidity of wet coating films with different functions, leading to skin failure and mixed layers when baking after midcoat coating is omitted.
Innovation Solution
A coating facility with multiple zones for sequential coating and baking, including a first base outer surface coating zone, second base inner and outer surface coating zones, clear coating zones, and a baking zone, where the first and second base coatings are performed by wet-on-wet coating, and simultaneously baked and cured, allowing for the incorporation of midcoat functions into the first base coating film to abolish midcoat coating and baking, and incorporating setting zones for additional film flow and manual coating capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wet-on-wet coating is performed for 3C2B method without midcoat baking, then the number of baking rounds is reduced to 2, but the fluidity control of coating film interface becomes difficult causing skin failure and mixed layers
Solution Approach 1:
The coating facility is divided into multiple sequential coating zones (first base outer surface coating zone, second base inner surface coating zone, second base outer surface coating zone, clear coating zone) along the transport direction. This segmentation allows independent control of each coating application, enabling precise management of wet coating film interfaces during wet-on-wet coating processes without requiring midcoat baking.
Solution Approach 2:
The first base coating is applied and allowed to flow and level on the outer surface before the second base coating is applied. This preliminary action of applying the first coating and allowing it to settle creates a stable base layer, preventing interface mixing and skin failure when subsequent coatings are applied in wet-on-wet manner.
2Manufacturing precision
If multiple coating zones are provided sequentially along transport direction, then wet-on-wet coating with proper film flow control is achieved, but the device complexity increases
Solution Approach 1:
Multiple coating functions (first base coating, second base coating, clear coating) are merged into a single continuous coating facility with sequential zones. The facility combines wet-on-wet coating capabilities, setting zones for film flow, and baking functionality in one integrated system, reducing the need for separate processing lines while maintaining coating quality.
Solution Approach 2:
The coating facility is designed with multi-functional zones that can perform different coating operations (base coating, clear coating, setting) within a single integrated system. The baking zone serves as a universal curing chamber for all previously applied coating layers, eliminating the need for separate baking stations for each coating stage.
3Object-generated harmful factors
If midcoat coating and baking are abolished to reduce CO2 emissions, then environmental impact is reduced, but controlling the interface fluidity of different functional coating films becomes difficult
Solution Approach 1:
The midcoat coating step and its associated baking process are extracted and removed from the traditional coating sequence. By eliminating this intermediate step, the facility achieves 3C2B coating method that reduces CO2 emissions and energy consumption while maintaining coating quality through direct wet-on-wet application of base and clear coatings with controlled interface fluidity.
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 approach enables a smooth coating film surface, reduces CO2 emissions, saves energy, and achieves a satisfactory coating film appearance by ensuring proper film flow and simultaneous curing of the base and clear coatings.
Implementation Method 1
a baking zone (for example, a baking zone 26 which will be described later) which is provided downstream of the clear coating zone and in which wet coating films formed with the first base paint and the second base paint are simultaneously baked and cured
Data Source
AI summary
A coating facility including: a first base outer surface coating zone; a second base inner surface coating zone; a second base outer surface coating zone; a clear inner surface coating zone and a clear outer surface coating zone; and a baking zone in which each wet coating film are simultaneously baked and cured.