Barrier Element in Adhesive Sealing Layer for Microstructured Optical Films
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Solution Overview
Problem
Light directing articles, such as daylight redirecting films and retroreflective sheetings, face challenges in protecting microstructured elements from mechanical and chemical damage during lamination, which can alter their optical properties and reduce their effectiveness, and existing sealing methods increase manufacturing costs and create undesirable patterns.
Innovation Solution
A light directing article comprising a structured layer with microstructured elements and an adhesive sealing layer that includes a barrier element with a crosslinked polymeric matrix of specific modulus of elasticity, preventing the adhesive from contacting the microstructured elements and maintaining optical performance while eliminating the need for a separate sealing film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate sealing film is added to protect microstructured elements, then the protection of microstructured elements from adhesive contact is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the sealing function and adhesive function into a single layer by incorporating a barrier element within the adhesive sealing layer. The barrier element prevents adhesive contact with microstructured elements while the adhesive sealing layer provides both sealing and adhesion, eliminating the need for a separate sealing film and reducing overall device complexity
Solution Approach 2:
The barrier element acts as an intermediary component within the adhesive sealing layer that specifically prevents harmful adhesive contact with microstructured elements. This intermediary structure allows the adhesive to perform its sealing function while blocking direct contact with the optical elements, providing protection without requiring additional separate layers
2Reliability
If a sealing film is added to protect microstructured elements, then the protection from adhesive contact is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions (sealing, adhesion, and protection) into a single integrated adhesive sealing layer containing a barrier element. This consolidation eliminates the need for separate sealing films and reduces the number of manufacturing steps, thereby lowering manufacturing cost while maintaining protection of microstructured elements
Solution Approach 2:
The adhesive sealing layer is designed to perform multiple functions simultaneously: it provides sealing, adhesion, and protection through the integrated barrier element. This multi-functional design eliminates the need for separate dedicated sealing films, reducing material costs and simplifying the manufacturing process
3Reliability
If a sealing film is added to protect microstructured elements, then the protection from adhesive contact is improved, but visible patterns are created that reduce appearance quality
Solution Approach 1:
The barrier element is strategically positioned only in specific locations where microstructured elements are present, rather than applying a continuous sealing film across the entire surface. This localized approach provides protection exactly where needed while leaving the rest of the surface uniform and free of visible patterns, maintaining appearance quality
4Ease of manufacture
If the adhesive sealing layer is placed directly next to microstructured elements, then the manufacturing process is simplified, but the adhesive contacts and damages the microstructured elements
Solution Approach 1:
The barrier element serves as an intermediary structure within the adhesive sealing layer that prevents direct contact between the adhesive and microstructured elements. This allows the adhesive sealing layer to be placed immediately next to the microstructured elements during lamination, simplifying the manufacturing process, while the barrier element protects the integrity of the microstructured elements from adhesive damage
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 the durability and optical performance of light directing articles by preventing adhesive contact with microstructured elements, reducing damage and maintaining light management capabilities, while also reducing manufacturing costs and eliminating undesirable patterns.
Implementation Method 1
The first region with the barrier element and second region have sufficiently different properties to form a low refractive index layer between the adhesive sealing layer and the structured layer
Implementation Method 2
the barrier element comprises a crosslinked polymeric matrix having a modulus of elasticity less than 4.8 GPa
Data Source
Figure 1A~2
Figure 3
AI summary
The disclosed light directing article comprises a structured layer, an adhesive sealing layer, and barrier elements. The structured layer comprises multiple microstructured elements that are opposite a major surface. The adhesive sealing layer has a first region and a second region. The second region is in contact with the structured layer. The barrier element are at the first region. The first region with the barrier element and second region have sufficiently different properties to form a low refractive index layer between the adhesive sealing layer and the structured layer. The barrier element comprises a crosslinked polymeric matrix having a modulus of elasticity less than 4.4 GPa.