Foaming Adhesive Sheet Surface Tuning for Wide-Gap Bonding
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Solution Overview
Problem
Existing foaming adhesive sheets face challenges with ease of insertion into gaps between members and maintain adhesiveness, especially when gaps are wide.
Innovation Solution
A foaming adhesive sheet with a substrate and an adhesive layer having a pressure-sensitive adhesive force of 0 N/25 mm or more and 0.1 N/25 mm or less, a static friction coefficient of 0.30 or less, and a pencil hardness of F or more, along with a curable adhesive and a foaming agent, enhances inserting properties and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adhesive layer is made soft and flexible to improve ease of insertion into gaps, then the inserting property is improved, but the adhesiveness after curing may be compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pressure-sensitive adhesive force (0.01-0.1 N/25mm) and surface hardness (F or more, 10-50 Shore A) of the adhesive layer. These parameter optimizations enable the adhesive to be soft enough for easy insertion into gaps while maintaining sufficient adhesiveness after curing, resolving the contradiction between ease of operation and reliability.
2Ease of operation
If the adhesive layer is made harder to improve sliding property and blocking resistance, then ease of operation is improved, but the adhesiveness may be reduced
Solution Approach 1:
The patent optimizes the surface hardness parameter to F or more (10-50 Shore A) and pressure-sensitive adhesive force to 0.01-0.1 N/25mm. This parameter control provides sufficient sliding property and blocking resistance for ease of operation while preserving adhesiveness, resolving the contradiction between ease of operation and reliability.
3Ease of operation
If a releasing agent is applied to the adhesive layer to improve ease of insertion, then inserting property is improved, but the adhesiveness after curing is significantly reduced
Solution Approach 1:
The patent eliminates the releasing agent by optimizing the adhesive layer's intrinsic properties: pressure-sensitive adhesive force (0.01-0.1 N/25mm) and surface hardness (F or more, 10-50 Shore A). These parameter optimizations provide sufficient ease of insertion without requiring a releasing agent, thereby maintaining high adhesiveness after curing and avoiding the contradiction.
4Reliability
If the adhesive layer is made thicker to improve adhesiveness in wide gaps, then reliability is improved, but the inserting property deteriorates due to increased rigidity
Solution Approach 1:
The patent optimizes the pressure-sensitive adhesive force (0.01-0.1 N/25mm) and surface hardness (F or more, 10-50 Shore A) parameters of the adhesive layer. These parameter controls enable the adhesive to maintain good inserting property even at thicknesses of 10μm or more, while providing sufficient adhesiveness in wide gaps, thus resolving the contradiction between reliability and ease of operation.
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 exhibits excellent inserting properties and adhesiveness, even in wide gaps, with improved sliding and blocking resistance, and maintains high adhesiveness after curing.
Implementation Method 1
an adhesive layer which includes a curable adhesive and a foaming agent
Implementation Method 2
adhering the first member and the second member by foaming and curing the foaming adhesive sheet
Data Source
AI summary
A foaming adhesive sheet comprising a substrate and an adhesive layer placed on at least one surface side of the substrate; wherein the adhesive layer includes a curable adhesive, and a forming agent; the adhesive layer is placed on an outermost surface; a pressure-sensitive adhesive force of the adhesive layer is 0 N/25 mm or more and 0.1 N/25 mm or less; a static friction coefficient of a surface of the adhesive layer opposite to the substrate is 0.30 or less; and a pencil hardness of a surface of the adhesive layer opposite to the substrate is F or more.