Foam Adhesive Patch With Wavy Glue For Moisture Permeability
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Solution Overview
Problem
Adhesive skin patches used for wearable devices suffer from reduced adhesiveness due to moisture buildup, leading to peeling, discomfort, and skin irritation, and fail to accommodate skin flexibility and expansion.
Innovation Solution
An adhesive skin patch with a foam substrate having a bubble fraction of 70% or more and an adhesive layer formed in a wavy line shape on one side, providing excellent moisture permeability and stretchability, and optionally a second adhesive layer on the opposite side for enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wearable device is fixed to the skin using an adhesive skin patch, then the device can be mounted on the body for measurement, but moisture buildup under the patch causes stuffiness, reduced adhesiveness, peeling, discomfort, and skin irritation
Solution Approach 1:
The substrate is designed as a foam sheet with open cells and high bubble fraction (70% or more), creating a porous structure that allows moisture vapor to permeate through the patch. This prevents moisture buildup under the adhesive layer, maintaining adhesiveness while reducing stuffiness and skin irritation during long-term wear
2Reliability
If the adhesive skin patch is made with high adhesiveness to ensure accurate mounting, then the device stays firmly attached, but the patch cannot accommodate skin expansion and contraction, causing peeling and discomfort
Solution Approach 1:
The foam sheet substrate provides inherent flexibility and elasticity that allows the adhesive patch to stretch and conform with skin movements. This flexible base structure maintains strong adhesive contact while accommodating natural skin expansion and contraction, preventing peeling and discomfort
3Reliability
If the adhesive layer covers the entire substrate surface to maximize adhesion, then the patch sticks strongly to the skin, but water vapor permeability is restricted and stuffiness increases
Solution Approach 1:
The adhesive layer is applied selectively to specific regions of the substrate rather than covering the entire surface. This segmented adhesive configuration maintains sufficient bonding strength to the skin while leaving portions of the porous foam substrate exposed to allow moisture vapor to escape, reducing stuffiness without compromising adhesion
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 solution significantly reduces skin irritation, peeling, and discomfort by allowing moisture to escape and accommodating skin expansion, while maintaining strong adhesion and flexibility.
Implementation Method 1
water vapor permeability of the surface of a substrate of the adhesive skin patch is restricted by the presence of the wearable device or the like
Implementation Method 2
adhesive layer is partially formed on one side of the substrate in a wavy line shape
Data Source
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AI summary
The present invention relates to an adhesive skin patch including a substrate and an adhesive layer, wherein the substrate is formed of a foam sheet having open cells and a bubble fraction of 70% or more, and the adhesive layer is partially formed on one side of the substrate.