Resin Substrate Decoration with Recessed Metal Film
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Solution Overview
Problem
Existing decorative methods for black substrates, such as mask vapor deposition and hot stamping, often result in poor appearance quality due to inaccurate decoration boundaries and spreading of metal vapor deposition films or insufficient metal foil transfer.
Innovation Solution
A decorative member and method involving a light-transmitting resin substrate with recessed portions on its back surface, where a hot stamping foil layer is applied to the flat areas and a metal vapor deposition film is laminated over the recessed portions, creating a clear boundary and enhancing the appearance with contrast and depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mask vapor deposition is used to form metal film on protruded portions, then metal decoration can be applied, but the metal vapor deposition film spreads out causing poor boundary accuracy
Solution Approach 1:
The substrate surface is segmented into recessed portions and flat portions, with different decorative layers applied to each segment. The recessed portions receive metal vapor deposition film while flat portions receive hot stamping foil layer, preventing film spreading issues by isolating the deposition zones.
Solution Approach 2:
Different surface regions are given different properties: recessed portions are designed to receive and contain metal vapor deposition film with controlled adhesion, while flat portions are optimized for hot stamping foil application. This local differentiation prevents unwanted film spreading across the entire surface.
2Manufacturing precision
If hot stamping is used to transfer metal foil to protruded portions, then metallic decoration can be achieved, but insufficient transfer occurs resulting in poor appearance
Solution Approach 1:
The decoration process is segmented into two distinct operations: hot stamping on flat portions and metal vapor deposition on recessed portions. This segmentation ensures that each method is applied where it performs best, with hot stamping providing complete foil transfer on flat surfaces without the spreading issues that plague vapor deposition on protruded portions.
3Shape
If metal vapor deposition is applied to achieve metallic color pattern, then good appearance can be obtained, but the decoration boundary becomes unclear due to film spreading
Solution Approach 1:
The invention moves the metal vapor deposition from protruded portions (one-dimensional surface feature) to recessed portions (introducing depth dimension). The recessed portions act as containment structures that prevent lateral spreading of the metal film, maintaining sharp boundaries while preserving the metallic appearance through the half-mirror effect.
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 solution provides a decorative member with a clear, high-accuracy boundary and improved appearance by preventing metal vapor deposition film spreading and ensuring precise transfer of the hot stamping foil, resulting in a sharp, high-grade visual impression.
Implementation Method 1
a hot stamping foil layer which is formed on the back surface of the light-transmitting substrate except for the recessed portion
Implementation Method 2
a metal vapor deposition film layer which is laminated on the recessed portion on the back surface of the light-transmitting substrate and the hot stamping foil layer
Data Source
AI summary
A decorative member includes a light-transmitting substrate which is made of resin and is formed with a recessed portion on a back surface thereof, a hot stamping foil layer which is formed on the back surface of the light-transmitting substrate except for the recessed portion, and a metal vapor deposition film layer which is laminated on the recessed portion on the back surface of the light-transmitting substrate and the hot stamping foil layer.