Pre-coated Draining Area for Uniform Flood Coating
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Solution Overview
Problem
Existing methods for coating complex, three-dimensional plastic parts, such as motor vehicle lighting device cover plates, result in uneven paint layer thicknesses, leading to inadequate protection against weather and environmental influences, particularly in the edge areas where paint tends to flow off quickly, compromising scratch and weather resistance.
Innovation Solution
A method involving a pre-coating step where the draining area is sprayed or flooded with paint before the main flooding step, ensuring an additional layer in the critical areas, followed by a full-surface flooding process to achieve uniform layer thickness and enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard flood coating process is used on complex three-dimensional plastic parts, then the coating process is simple and fast, but the paint layer thickness becomes uneven with inadequate protection in edge areas
Solution Approach 1:
The coating process is divided into two distinct stages: a pre-coating step that applies paint to the draining area using spray or flood methods, followed by a main flooding step that applies paint to the entire surface. This segmentation allows each stage to address specific coating needs, ensuring uniform thickness across complex geometries while maintaining process efficiency.
Solution Approach 2:
The draining area is pre-coated with paint before the main flooding step. This preliminary action ensures that edge areas, which would otherwise receive insufficient paint due to rapid runoff, are预先 protected with an adequate paint layer that will be uniformly completed by the subsequent flooding process.
2Productivity
If the plastic part is oriented vertically for flood coating, then the coating process is efficient, but paint accumulates in corners and edges due to gravity
Solution Approach 1:
The draining area is pre-coated with paint before the main flooding step. This preliminary action ensures that edge areas, which would otherwise receive insufficient paint due to rapid runoff, are预先 protected with an adequate paint layer that will be uniformly completed by the subsequent flooding process.
Solution Approach 2:
The pre-coating step specifically targets the draining area with enhanced paint application, creating a locally optimized coating thickness in critical edge zones. This local quality enhancement ensures that areas prone to paint depletion receive sufficient coverage while the main flooding step completes the uniform coating across the entire surface.
3Manufacturing precision
If the paint viscosity is reduced to improve flow on horizontal surfaces, then coating coverage improves, but paint runs off vertical edges too quickly
Solution Approach 1:
The draining area is pre-coated with paint before the main flooding step. This preliminary action ensures that edge areas, which would otherwise receive insufficient paint due to rapid runoff, are预先 protected with an adequate paint layer that will be uniformly completed by the subsequent flooding process.
Solution Approach 2:
The paint application process utilizes controlled viscosity parameters during the pre-coating and flooding steps. By optimizing paint viscosity and application rate, the process ensures adequate coverage on horizontal surfaces while preventing excessive runoff from vertical edges, achieving both coverage and edge protection.
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 ensures a visually appealing and functionally effective paint layer with consistent thickness across complex components, improving scratch resistance and weather protection, particularly in areas difficult to access during the standard flow-coating process.
Implementation Method 1
a surface of the plastic part to be coated is provided with a lacquer layer in a flooding step by applying lacquer to a flooding area of the surface to be coated and by allowing the lacquer to run off over a draining area
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a method for coating a plastic part (1) with a lacquer, wherein in a flooding step a surface of the plastic part (1) to be coated is provided with a lacquer layer (17) by applying lacquer (16) to a flooding area (2) of the surface to be coated and by allowing the lacquer (16) to run off over a draining area (3). In order to enable the coating of complex three-dimensional components (1), it is proposed that the draining area (3) be provided with paint (8; 10; 14) before the execution of the flooding step in a spraying step or alternatively in a separate upstream flooding step, so that a paint coating (7, 17) is formed in the draining area (3) which consists of sprayed or separately flooded paint (8; 10; 14) and flooded paint (16), and in the flooding area (2) of the surface to be coated a paint coating (17) is formed which consists only of flooded paint (16).