Transparent Plastic Cover Coating for Sink Mark Concealment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plastics covers with transparent carrier layers and three-dimensional depth effects suffer from surface unevennesses due to wall thickness variations, which are difficult to compensate for using conventional methods, and subsequent protective lacquers exacerbate these imperfections.
Innovation Solution
A hard-wearing polyurethane finishing layer is applied directly onto the visible side of the carrier layer, compensating for small surface unevennesses and providing a smooth, wear-resistant surface, while eliminating the need for subsequent lacquering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If wall thickness variations are introduced in the carrier layer to create three-dimensional depth effect, then visual appearance is improved, but surface unevenness occurs on the visible side
Solution Approach 1:
The invention divides the cover into two separate components: a carrier layer that provides the three-dimensional depth effect through wall thickness variations, and a separate transparent finishing layer that is applied afterward to compensate for surface unevenness. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
The transparent finishing layer is applied in advance (before final assembly or use) to the carrier layer. This preliminary action allows the finishing layer to fill and compensate for surface unevenness, sink marks, and other imperfections created during the injection molding of the carrier layer, ensuring a smooth final surface.
2Reliability
If conventional lacquer is applied to protect against UV aging and scratches, then protection is improved, but surface unevenness becomes more apparent
Solution Approach 1:
The invention changes the key parameter of the protective layer from conventional lacquer to a transparent thermoplastic material. This material parameter change allows the protective layer to be applied in a molten state that can flow into and fill surface irregularities, then solidify to provide both protection and surface smoothing, unlike conventional lacquer that forms a separate coating layer.
Solution Approach 2:
The invention creates a composite structure combining the carrier layer (with three-dimensional effect) and a transparent thermoplastic finishing layer. This composite material approach allows the finishing layer to serve dual functions: protecting the carrier layer from UV aging and scratches while simultaneously smoothing out surface unevenness through its application process.
3Manufacturing precision
If a transparent finishing layer is applied to compensate surface unevenness, then surface quality is improved, but additional manufacturing steps are required
Solution Approach 1:
The invention merges the protective function and the surface smoothing function into a single transparent thermoplastic finishing layer. This combined approach eliminates the need for separate protective coating steps and surface treatment steps, simplifying the overall manufacturing process while achieving multiple objectives simultaneously.
Solution Approach 2:
The transparent thermoplastic finishing layer serves multiple functions: it provides UV protection, scratch resistance, and surface smoothing in a single application step. This multi-functionality reduces the number of manufacturing steps required compared to using separate layers for each function.
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 polyurethane finishing layer effectively conceals sink marks and reduces surface waviness, enhancing the visual quality and durability of the plastics cover, offering a high-quality appearance and self-healing properties against scratches.
Implementation Method 1
a visible side (2) of the carrier layer (6) with at least one defect site (23), in particular with at least one unevenness of the visible surface (22), arranged on the visible side (2) of the carrier layer (6), and a transparent finishing layer (20), in particular made of polyurethane, which is molded onto the visible side (2) of the carrier layer (6) in an inviscid state and compensates for the defect sites (23)
Data Source
AI summary
A plastics cover for a motor vehicle includes a visible side, an inner side, and a carrier side. The carrier layer is composed of a transparent polymer material, which has a continuous and constant basic wall thickness and at least one of an arrow-shaped, tetrahedral, pyramidal, conical, or cuboidal recess at which at least one wall thickness variation is formed on the inner side of the carrier layer. The finishing layer which is arranged on a visible surface of the carrier layer. The finishing layer comprises a transparent polymer material.