Transfer Sheet with Recessed Releasable Layer for High Definition Gradation
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Solution Overview
Problem
Existing transfer sheets and decorative products face challenges in achieving high definition gradations and are prone to fingerprint adhesion due to smooth surfaces.
Innovation Solution
A transfer sheet comprising a base sheet, a releasable layer with ultraviolet curing resin and minute irregularities, a peeling layer, and a single color solid print layer, where the maximum width to depth ratio of the irregularities is between 10 and 50, and the number or depth of recessed portions changes stepwise, preventing fingerprint adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dots are formed by printing to reproduce gradations, then gradation reproduction is achieved, but the dots blur and high definition is not obtained
Solution Approach 1:
The releasable layer is divided into multiple recessed portions that correspond to dots in the gradation print layer. Each recessed portion has a specific depth and width that transfers the dot pattern with high definition to the decorative product, avoiding the blurring issue of conventional printing methods
Solution Approach 2:
Instead of forming gradations through printing on a flat surface, the invention uses the depth dimension of recessed portions in the releasable layer. The varying depths of recessed portions create different light reflection characteristics, enabling high definition gradation reproduction without printing dots
2Shape
If the outermost surface is made flat and smooth for aesthetic purposes, then appearance quality is improved, but sebum (fingerprint) is likely to adhere to the surface
Solution Approach 1:
The peeling layer has different surface properties in different regions. The outermost surface maintains flatness and smoothness for aesthetic purposes, while the inner surface contains recessed portions that provide fingerprint resistance. This local differentiation allows the surface to simultaneously achieve appearance quality and anti-fingerprint properties
Solution Approach 2:
Instead of making the outermost surface rough to prevent fingerprints, the invention inverts the approach by creating recessed portions on the inner surface of the peeling layer. The outer surface remains smooth for aesthetics, while the inner surface structure provides the desired fingerprint resistance through the recessed portions
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 enables high definition gradation reproduction while minimizing fingerprint adherence, maintaining a matte feeling and ensuring reliable transfer and peeling.
Implementation Method 1
a releasable layer laminated on the base sheet, containing an ultraviolet curing resin
Data Source
AI summary
A transfer sheet is configured to include a base sheet; a releasable layer laminated on the base sheet, containing an ultraviolet curing resin, and including minute irregularities on at least part of a surface opposite to a surface in contact with the base sheet; a peeling layer laminated entirely on the releasable layer; and a single color solid print layer laminated in a section on the peeling layer corresponding at least to a region where the minute irregularities of the releasable layer are formed. A maximum width W of a recessed portion of the minute irregularities and a depth D of the recessed portion of the minute irregularities satisfy 10≤W/D≤50, W≤100 μm and 2 μm≤D≤10 μm. At least one of the number of recessed portions per unit area and the depth of the recessed portion changes stepwise.