Thin Adhesive Tape Foam Bubble Control for Impact Resistance
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Solution Overview
Problem
Adhesive tapes with foam bases, particularly those of small thickness and width, face challenges in providing both good conformability and impact resistance while maintaining reworkability, especially in portable electronic devices with increasing screen sizes and limited space, where they are prone to separation and cracking upon impact.
Innovation Solution
An adhesive tape with a foam base of 120 μm or less in thickness, having a 25% compressive strength of 160 kPa or more and a density of 0.4 g/cm3 or more, and an average bubble diameter of 23 to 50 μm, which combines excellent conformability, impact resistance, and reworkability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the adhesive tape thickness is reduced to achieve good conformability and suitability for thin portable devices, then the conformability improves, but the impact resistance deteriorates causing easy separation and cracking
Solution Approach 1:
The invention changes the physical parameters of the foam base by controlling the average bubble diameter in the vertical direction to be 23 to 50 μm, while maintaining thickness of 120 μm or less. This parameter optimization enables the thin adhesive tape to achieve both good conformability and sufficient impact resistance, resolving the contradiction between thinness and strength.
2Adaptability or versatility
If the adhesive tape width is reduced to improve design freedom for information display units, then the design flexibility improves, but the reworkability deteriorates making separation difficult
Solution Approach 1:
The invention optimizes the foam base parameters including density (0.4 g/cm³ or more) and average bubble diameter (23 to 50 μm in vertical direction) to achieve a balance between thinness and reworkability. This enables narrow adhesive tapes to maintain both design freedom and sufficient reworkability for component separation when needed.
3Strength
If the foam base density is increased to improve impact resistance, then the strength improves, but the conformability deteriorates
Solution Approach 1:
The invention precisely controls the foam base parameters including density (0.4 g/cm³ or more) and average bubble diameter in vertical direction (23 to 50 μm). This optimized parameter combination achieves the best balance between impact resistance and conformability, allowing the adhesive tape to be both strong and flexible.
Data Source
AI summary
An adhesive tape includes a foam base and an adhesive layer disposed on at least one surface of the foam base, in which the foam base has a thickness of 120 μm or less, a 25% compressive strength of 160 MPa or more, and a density of 0.4 g/cm3 or more, and an average bubble diameter in a vertical direction of the foam base is 23 to 50 μm. Even though the adhesive tape has a small thickness, with this adhesive tape, it is possible to realize excellent waterproofness due to good conformability to an adherend, such drop impact resistance that detachment of the adhesive tape and cracking of the foam base at the time of dropping do not easily occur, and such excellent reworkability that a component can be efficiently separated even in the case where a problem occurs.