Optical Mask Layer for High Chroma Decorative Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing decorative film manufacturing methods using cholesteric liquid crystal compounds and optical masks face challenges in achieving high chroma saturation and efficient production of long films, as they often result in halftone dot-like hue changes with low chroma saturation and require bonding multiple short optical mask layers, leading to poor manufacturing efficiency.
Innovation Solution
A manufacturing method involving an optical mask layer with a halftone dotted region printed using an AM screen tone with a screen ruling of 250 lines or less, combined with a semi-translucent solid region, and a cholesteric liquid crystal layer containing a photosensitive chiral agent, where the optical mask layer's light transmittance is controlled to achieve high chroma saturation and efficient production of long decorative films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a long optical mask layer is formed using high-definition printing methods (ink jet sheet-fed printing, laser printer, or laser photoplotter) to achieve high chroma saturation, then halftone dot-like hue changes are suppressed, but only short optical mask layers of several meters or less can be formed, requiring bonding of multiple short layers which reduces manufacturing efficiency
Solution Approach 1:
The patent divides the optical mask layer into multiple sections that can be printed separately using high-definition printing methods and then bonded together to form a long optical mask layer. This segmentation allows each section to maintain high chroma saturation while the overall length can extend to 100 meters or more through bonding of multiple sections.
Solution Approach 2:
The patent enables continuous production of long decorative films by bonding multiple short optical mask layers into a continuous long optical mask layer, allowing the manufacturing process to proceed without interruption and achieving both high chroma saturation and long film length.
2Productivity
If an optical mask layer with coarse halftone dots is used to form long decorative films efficiently, then manufacturing efficiency is improved, but halftone dot-like hue changes appear on the decorative film resulting in low chroma saturation
Solution Approach 1:
The patent segments the optical mask layer into multiple printable sections that can be produced using high-definition printing methods, then bonds them together to achieve both fine halftone dot quality and long overall length, eliminating the need to choose between quality and efficiency.
3Length of stationary object
If multiple short optical mask layers are bonded together to form long decorative films, then long film production is achieved, but manufacturing efficiency deteriorates due to the bonding process
Solution Approach 1:
The patent performs preliminary printing of multiple optical mask layer sections using high-definition printing methods before bonding, ensuring that each section has the required quality. This preliminary action allows for efficient bonding processes and achieves long film length without sacrificing manufacturing efficiency.
Data Source
AI summary
A manufacturing method of a laminate includes: providing an optical mask layer on a substrate by printing a first pattern having AM screen tone with a screen ruling of 250 lines or less and having a halftone dotted region having a halftone dot area ratio of 0.5% to less than 99.5% on the substrate using a first ink, and printing a second pattern having a semi-translucent solid region having a print-area ratio of 99.5% or more and a light transmittance of 5% to less than 95% at a position overlapping the halftone dotted region of the first pattern using a second ink; providing a liquid crystal layer containing a liquid crystal compound and a photosensitive chiral agent on a side of the substrate opposite to the optical mask layer; and irradiating the liquid crystal layer with light through the optical mask layer to subject the photosensitive chiral agent to photoreaction.