Decorative Sheet Light Reflective Projection Black Ink Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing decorative sheets fail to achieve a bright high-grade appearance with a large contrast between light and shadow, as previous techniques using black layers and pigments do not provide sufficient depth or luminosity, leading to weak pattern differentiation at varying viewing angles.
Innovation Solution
A decorative sheet is created with a light transmissive substrate, a light reflective projection portion, and a black layer formed using a black ink that meets specific conditions: a gloss value of 80° or higher and a lightness L* value of 10 or less, achieved by applying the ink to a polyethylene terephthalate film using a bar coater and drying at 80°C for 15 minutes, enhancing the contrast between light and shadow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a black layer is used to absorb light and create deep jet black background, then the background depth is improved, but the contrast between light and shadow becomes insufficient and pattern visibility at various viewing angles deteriorates
Solution Approach 1:
The black layer is segmented into multiple functional sub-layers: a light-absorbing black pigment layer and a separate light-reflecting projection portion. This segmentation allows each layer to perform its specific function optimally - the black layer provides depth while the projection portion creates contrast and visibility at various viewing angles.
Solution Approach 2:
Different regions of the decorative sheet have different optical properties. The black layer provides uniform light absorption across the background, while the projection portion creates localized light reflection areas. This local differentiation of optical properties enables both deep background and high contrast simultaneously.
2Ease of manufacture
If black pigment particles are densely arranged along grooves to form light reflecting surface, then the uneven pattern visibility is improved, but the jet black depth becomes insufficient and contrast between light and shadow deteriorates
Solution Approach 1:
The functional requirements are segmented into two separate structural elements: the black layer for jet black depth and the projection portion for pattern visibility. This eliminates the compromise required when combining both functions in a single layer.
Solution Approach 2:
The solution moves from a two-dimensional flat black layer to a three-dimensional structure with projection portions that extend outward. This dimensional change enables light to be reflected from different angles, improving pattern visibility while maintaining the deep black background through the separate black layer.
3Shape
If a printed layer with thickness of 20 μm or more is used to achieve stereoscopic effect, then the three-dimensional appearance is improved, but the light absorption capability deteriorates and contrast between light and shadow becomes insufficient
Solution Approach 1:
The stereoscopic effect is achieved through the projection portion's three-dimensional structure rather than through thick printing. The black layer remains thin and highly absorptive, while the projection portion provides the necessary depth and立体感 through its geometric form and light reflection properties.
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 produces a bright high-grade decorative sheet with a significant contrast between light and shadow, where the pattern appears deep and luminous, changing noticeably with viewing angles, thereby enhancing the sense of depth and visibility.
Implementation Method 1
the black layer absorbs light
Implementation Method 2
a light reflective projection portion formed over the light transmissive substrate
Data Source
AI summary
Provided is a decorative sheet (100) including: a transmissive substrate (10) which is sheet-like or plate-like; a light reflective projection portion (20) formed over the light transmissive substrate (10); and a black layer (30) formed over the light reflective projection portion (20), in which an average height of the light reflective projection portions (20) is 1 to 200 pm, and the black layer (30) is formed by using a black ink satisfying conditions below.