Adhesive Sheet Microstructured Layer for Rough Surfaces
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Solution Overview
Problem
There is a need for an adhesive sheet that can adhere to both smooth and rough surfaces with sufficient adhesive force while maintaining a smooth visual appearance, suitable for various applications including graphic sheets on surfaces like mortar, concrete, siding boards, stucco, or embossed wallpaper.
Innovation Solution
An adhesive sheet comprising a rigid sheet with a thickness of 80 μm to 2 mm and a first pressure-sensitive adhesive layer with a thickness of 40 μm to 1.2 mm, featuring a microstructured surface with irregularities, which provides strong adhesion to both smooth and rough surfaces and maintains a smooth visual appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible adhesive sheet is used to follow the shape of a rough substrate surface, then adhesion is improved, but the visual appearance becomes rough and uneven
Solution Approach 1:
The adhesive layer is designed with localized irregularities (protrusions and recesses) that correspond to the rough substrate surface, while the overall sheet maintains a smooth appearance. This local adaptation allows the adhesive to conform to the substrate at the micro-level while preserving visual smoothness at the macro-level.
Solution Approach 2:
The invention transitions from a two-dimensional flat adhesive surface to a three-dimensional microstructured surface with controlled irregularities. This dimensional change enables the adhesive to engage with rough substrate features while the rigid sheet backbone prevents excessive deformation that would compromise visual appearance.
2Shape
If a rigid sheet is used to maintain smooth visual appearance, then visual appearance is improved, but adhesion to rough surfaces deteriorates
Solution Approach 1:
The rigid sheet provides overall structural integrity and smooth appearance, while the adhesive layer introduces localized compliance through its microstructured design. This allows different parts of the system to fulfill different functions: the rigid sheet for visual appearance and the structured adhesive for adhesion.
Solution Approach 2:
The invention combines a rigid sheet material with a specially formulated adhesive layer that has both rigid and compliant characteristics. This composite structure integrates the advantages of both rigid and flexible materials, achieving simultaneous visual smoothness and effective adhesion to rough surfaces.
3Reliability
If adhesive layer thickness is increased to improve adhesion to rough surfaces, then adhesion is improved, but the sheet becomes more flexible and loses rigidity
Solution Approach 1:
The adhesive layer is designed with localized protrusions and recesses that concentrate adhesive engagement at specific points on the rough substrate. This microstructured approach allows effective adhesion without requiring excessive overall thickness, thereby maintaining the rigidity provided by the rigid sheet backbone.
Solution Approach 2:
The adhesive layer is segmented into multiple protrusion and recession features rather than being a uniform continuous layer. This segmentation allows the adhesive to engage with rough substrate features at multiple discrete points, achieving strong overall adhesion while keeping each individual adhesive element thin and maintaining sheet rigidity.
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 adhesive sheet achieves sufficient adhesive force on both smooth and rough surfaces, ensuring a smooth visual appearance after application and preventing deformation or peeling, even on vertical surfaces.
Implementation Method 1
a first pressure-sensitive adhesive layer disposed on one surface of the rigid sheet, the first pressure-sensitive adhesive layer having a thickness of 40 μm or greater and 1.2 mm or less and including a microstructured surface including irregularities
Data Source
AI summary
Adhesive sheets that can adhere to both a smooth surface and a rough surface with sufficient adhesive force and that exhibits smooth visual appearance after adhesion regardless of a surface to be applied are described. In particular, adhesive sheets including a rigid sheet having a thickness of 80 μm or greater and 2 mm or less; and a first pressure-sensitive adhesive layer disposed on one surface of the rigid sheet, the first pressure-sensitive adhesive layer having a thickness of 40 μm or greater and 1.2 mm or less and including a microstructured surface including irregularities are described.