Adhesive Sheet With Cone-Shaped Fine Structure
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Solution Overview
Problem
Existing adhesive sheets with pressure-sensitive adhesive surfaces face challenges in achieving sufficient slidability under low pressure while maintaining adhesive strength under higher pressures, often requiring complex and costly methods such as dispersing hollow glass microspheres.
Innovation Solution
A fine structure on the adhesive layer surface featuring cone or frustum structures with a non-adhesive or weak adhesive material at the top and a strong adhesive material at the bottom, allowing for high slidability under low pressure and sufficient adhesion under increased pressure, achieved through a simple production method involving a mold with corresponding fine structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure sensitive adhesive surface is made smooth and uniform, then adhesive strength is improved, but slidability under low pressure deteriorates
Solution Approach 1:
The adhesive surface is divided into regions with different properties: cone-shaped protrusions with non-adhesive material at the tips for slidability, and adhesive material in the valleys and base portions for adhesion. This local differentiation allows the surface to simultaneously provide both sliding capability and adhesive strength.
Solution Approach 2:
The adhesive layer surface is segmented into multiple cone-shaped structures distributed across the surface. Each cone consists of different materials in different zones (non-adhesive at tip, adhesive at base), creating a segmented functional structure that independently provides sliding and adhesion functions.
2Ease of operation
If hollow glass microspheres are dispersed onto the adhesive surface, then slidability is improved, but production complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the need for hollow glass microspheres by using a purely structural approach with cone-shaped protrusions formed directly in the adhesive layer. This removes the complex dispersion process and eliminates the need for separate particulate materials.
Solution Approach 2:
Instead of using physical particles like glass microspheres, the invention creates a molded structural copy - cone-shaped protrusions - that achieve the same sliding function through geometry rather than through dispersed particles, simplifying the production process.
3Ease of operation
If non-adhesive projections are provided at constant intervals, then slidability is improved, but adhesive strength under pressure deteriorates
Solution Approach 1:
The cone-shaped structures are designed with non-adhesive material specifically at the tip portions that contact the adherend during sliding, while the base portions and valleys contain adhesive material that engages with the adherend when pressure is applied, creating different local adhesive characteristics based on contact conditions.
Solution Approach 2:
The adhesive contact dynamics change based on applied pressure: under low pressure, only the non-adhesive tips contact the adherend providing sliding; under high pressure, the adhesive base portions and valleys engage providing strong adhesion. The structure dynamically adapts its adhesive properties to the applied pressure level.
Data Source
AI summary
A pressure sensitive adhesive surface that does not adhere to the adherend and can be positioned by sliding it under low pressure, while it can exert a sufficient adhesive force under a pressure above a certain level. The adhesive sheet includes an adhesive layer with a fine structure on a surface thereof. The fine structure includes a plurality of cone or frustum structures, with the cones or frustums having two or more parts joined to each other via an interface. A first part is present on a top of the cones or frustums and is formed from a non-adhesive or a weak adhesive material, and a second part is present below the first part and is formed from a strong adhesive material.