Acrylic Decorative Product Plasma Treated Layer Color Tone Control
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Solution Overview
Problem
Decorative products with acrylic resin transparent members experience unexpected changes in color tone when a metal film is sputtered onto them, particularly becoming yellower when viewed from the opposite side due to the formation of a processed layer that affects light transparency.
Innovation Solution
A processed layer of diamond-like carbon with a thickness less than or equal to 260 nm is formed on the transparent member using plasma treatment, followed by sputtering a metal layer, which increases adhesion and limits color tone changes by adjusting the plasma treatment conditions, including exposure to oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metal film is sputtered onto an acrylic resin transparent member to form a decorative layer, then the decorative product obtains a three-dimensional aesthetic appeal, but the color tone of the decorative layer becomes yellower when viewed from the transparent member
Solution Approach 1:
A processed layer is introduced as an intermediary between the transparent member and the decorative layer. This processed layer, formed by plasma treatment, acts as a mediator that prevents direct interaction between the acrylic resin and the metal film, thereby preventing yellowing while maintaining adhesion and aesthetic appeal.
Solution Approach 2:
The plasma treatment parameters (gas type, power, time) are optimized to control the thickness and properties of the processed layer. By adjusting these parameters, the processed layer thickness is controlled to be less than or equal to 260 nm, which limits color tone changes while maintaining adhesion.
2Strength
If a plasma treatment is performed on the acrylic resin surface before sputtering to improve adhesion, then the adhesion between the decorative layer and transparent member is enhanced, but the transparency of the transparent member changes affecting the color tone
Solution Approach 1:
The plasma treatment parameters (gas type, power, time) are optimized to control the thickness and properties of the processed layer. By adjusting these parameters, the processed layer thickness is controlled to be less than or equal to 260 nm, which maintains adhesion while minimizing impact on transparency and color tone.
Solution Approach 2:
The structure becomes a composite of transparent member + processed layer + decorative layer. The processed layer, with its diamond-like carbon structure, provides adhesion enhancement while its controlled thickness ensures minimal optical interference, achieving both strong adhesion and maintained transparency.
3Strength
If the processed layer thickness is increased to improve adhesion, then the adhesion strength increases, but the color tone changes become more pronounced
Solution Approach 1:
The plasma treatment parameters are precisely controlled to limit the processed layer thickness to less than or equal to 260 nm. This parameter optimization achieves the optimal balance between adhesion strength and color tone stability, preventing excessive yellowing while ensuring sufficient adhesion.
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 effectively limits color tone changes and enhances long-term adhesion between the transparent member and the decorative layer, maintaining the original aesthetic appeal while ensuring durability.
Implementation Method 1
The processed layer is formed by performing a plasma treatment on the first surface of the transparent member
Implementation Method 2
The decorative layer is a metal layer formed on the processed layer formed by performing sputtering
Implementation Method 3
The processed layer is a layer having a structure of diamond-like carbon
Data Source
Figure 1A~2
AI summary
A decorative product (10) includes a transparent member (20) formed from an acrylic resin and a decorative layer (30) arranged on a rear surface (20r) of the transparent member (20). A processed layer (21) is located between the transparent member (20) and the decorative layer (30). The processed layer (21) is formed by performing a plasma treatment on the rear surface (20r) of the transparent member (20). The decorative layer (30) is a metal layer formed on the processed layer (21) formed by performing sputtering. The processed layer (21) has the thickness L of less than or equal to 260 nm.