Metallic Decoration Sheet Acrylic Film Adhesion
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Solution Overview
Problem
Conventional metallic decoration sheets face challenges in achieving high metallic gloss, maintaining appearance with deep carving or acute edges, and preventing exfoliation under high temperatures, while also being cost-effective and having good workability.
Innovation Solution
A method involving a thermoplastic resin sheet attached to a metal layer via a first adhesive layer on a mold release substrate, followed by removal of the substrate and application of an acrylic resin film via a second adhesive layer, using a smooth mold release substrate and specific metal layers like indium for improved gloss and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If acrylic resin film is used as the surface film layer to achieve high transparency and good moldability, then transparency and moldability are improved, but the film becomes difficult to handle due to breakability and requires thickness of more than 50 μm
Solution Approach 1:
The invention uses a composite structure consisting of an acrylic resin film (1) with thickness of 5 μm or less, a first adhesive layer (2), and a metal layer (3) on a smooth mold release film (4). This composite structure allows the thin acrylic film to be handled easily while maintaining high transparency and moldability, as the metal layer and adhesive provide structural support that compensates for the reduced thickness of the acrylic layer.
2Shape
If polyester polymer film with benzene ring and naphthalene ring or benzene ring and cyclohexane ring as main chain is used for deep carving, then deep carving capability is improved, but film formability cannot meet recent exacting requirements and transparency is low
Solution Approach 1:
The invention changes the material parameter from conventional polyester polymer film to acrylic resin film with specific thickness (5 μm or less), and changes the surface condition parameter from hair line to smooth. This parameter change enables high transparency while achieving excellent deep carving capability and acute edge formation that meets recent exacting requirements.
3Ease of manufacture
If conventional polyester polymer film is used with evaporation coating metal layer, then metal layer formation is achieved, but adhesive between film and metal is low causing exfoliation at interface under high temperature condition
Solution Approach 1:
The invention changes the film material parameter from polyester polymer to acrylic resin, and changes the surface condition parameter to smooth. This combination provides significantly improved adhesive properties between the film and evaporation coating metal layer, preventing exfoliation at the interface even under high temperature conditions such as heat test of 100°C x 24 hours, while maintaining ease of metal layer formation.
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 enhances metallic gloss and appearance, maintains cost-effectiveness, and prevents exfoliation at the interface even under high temperatures, ensuring fidelity and brightness in resin molded products with deep carvings or acute edges.
Implementation Method 1
it is made possible to form metal layer by vacuum applied technology such as vacuum evaporation coating on metal retention film
Implementation Method 2
attaching an acrylic resin film as the outermost surface film layer via a second adhesive layer to a metal layer side face
Data Source
Figure 1A~1E
Figure 2
AI summary
[Problem to be Solved] To provide a metallic decoration sheet that has better metallic gloss than the conventional one, good metallic appearance enough to equal gloss plating product even in an acute shape such as deep curving or edge, high productivity, and low production cost, and poses no drawback of interlayer exfoliation even under high temperature condition. [Solution] A method for making metallic decoration sheet, including the successive steps of: a base sheet attaching step of attaching a thermoplastic resin sheet via a first adhesive layer to a metal layer side face of a transfer film having the metal layer disposed on a smooth mold release face of a mold release substrate; a mold release substrate removing step of removing the mold release substrate to obtain an intermediate laminate sheet; and a surface film attaching step of attaching acrylic resin film via a second adhesive layer to a metal layer side face of the intermediate laminate sheet.