Adhesive Sheet Surface Roughness Control for Residue-Free Reuse
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Solution Overview
Problem
Existing adhesive sheets fail to balance adhesiveness, flatness, and reusability, often resulting in poor adhesion duration, adhesive residue contamination, and inability to be reused.
Innovation Solution
The adhesive sheet's surface roughness parameters (Ra, Rz, and Rz/Ra) are controlled within specific ranges (0.2-1.5 μm, 2.0-15.0 μm, and 3.0-30.0, respectively) to achieve excellent adhesiveness, flatness, and reusability, with a peelable adhesive force between 0.1 N to 12 N, and a gel rate of 45-70%, using a composition of base polymer, tackifying resin, and crosslinking agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive sheets have excellent adhesion properties, then adhesion strength is improved, but adhesive residue property deteriorates and peeling becomes difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface roughness parameters (Ra and Rz) of the adhesive layer within specific ranges (Ra: 0.05-1.0 μm, Rz: 0.5-10.0 μm). This quantitative control of surface morphology parameters enables the adhesive to achieve both strong bonding and clean peeling, resolving the contradiction between adhesion strength and residue-free removal.
2Reliability
If adhesive sheets have good adhesiveness and flatness, then adhesion performance is improved, but reusability deteriorates
Solution Approach 1:
The patent utilizes parameter changes by optimizing the ratio of Rz to Ra within specific ranges (Rz/Ra: 0.05-10.0, preferably 0.1-5.0). This specific parameter control enables the adhesive layer to maintain excellent adhesion performance while allowing for clean peeling and reuse, thereby achieving both reliability and adaptability.
Solution Approach 2:
The patent applies dynamics by enabling the adhesive sheet to transition between bonded and peeled states multiple times. The controlled surface roughness allows the adhesive to dynamically adapt between maintaining strong bond during use and allowing clean removal for reuse, supporting multiple bonding cycles.
3Shape
If adhesive sheets are made with smooth surface, then flatness is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes by defining specific ranges for both Ra (0.05-1.0 μm) and Rz (0.5-10.0 μm) that balance flatness and adhesiveness. The controlled surface roughness within these parameters ensures sufficient contact area for adhesion while maintaining overall flatness for good appearance and bonding uniformity.
Data Source
AI summary
The present disclosure provides an adhesive sheet. The adhesive sheet in the present disclosure comprises a substrate layer and an adhesive layer provided on at least one surface of the substrate layer. The surface roughness of the adhesive layer is as follows: Ra: 0.2 to 1.5 μm, preferably 0.4 to 1.0 μm; Rz: 2.0 to 15.0 μm, preferably 3.0 to 10.0 μm, and Ra/Rz is 3.0 to 30.0, preferably 5.0 to 20.0. The adhesive sheet in the present disclosure has excellent adhesion, flatness, and reusability (reworkability) and is easily peelable after use.