Adhesive Patch With Gradient Thickness To Prevent Edge Lifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Adhesive patches face issues with edge rubbing against clothes and skin, edge lifting, and reduced adhesion due to cold flow and protrusion of adhesive components, especially during storage and long-term use, leading to difficulties in removal from packages and reduced skin adhesion.
Innovation Solution
The adhesive patch design features a peripheral part with a smaller thickness, an intermediate part with a greater thickness, and a central part with an even greater thickness, along with a release liner extending beyond the patch, to minimize edge contact with packages and clothes, enhance skin adhesion, and prevent adhesive layer protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive layer is made thick to ensure sufficient skin adhesion, then the adhesion performance is improved, but the adhesive components protrude from the edge and cause cold flow during storage
Solution Approach 1:
The adhesive layer is designed with different thicknesses in different regions: a first thickness in the central region and a smaller second thickness in the peripheral region. This local variation allows the central part to provide sufficient adhesion while the peripheral part prevents protrusion and cold flow during storage.
2Reliability
If the adhesive layer is made thick to ensure sufficient skin adhesion, then the adhesion performance is improved, but the edge of the adhesive patch is easily rubbed against clothes and turned up
Solution Approach 1:
The adhesive layer thickness is locally optimized with a smaller thickness in the peripheral region compared to the central region. This design reduces the frequency of contact between the edge and external objects like clothes, thereby minimizing rubbing and edge lifting while maintaining sufficient adhesion through the thicker central region.
3Stability of the object's composition
If the adhesive layer is made thin to prevent protrusion and cold flow, then the shape stability is improved, but the skin adhesion becomes insufficient
Solution Approach 1:
The adhesive layer is designed with a thickness gradient: thicker in the central region to ensure sufficient skin adhesion and thinner in the peripheral region to prevent protrusion and maintain shape stability. This local differentiation resolves the contradiction between adhesion requirements and shape retention.
4Duration of action of stationary object
If the adhesive patch is stored in a package for a long time, then the transdermal administration function is improved, but the adhesive layer undergoes cold flow and protrudes from the edge
Solution Approach 1:
The peripheral region of the adhesive layer is designed with a smaller thickness to act as a barrier against cold flow during long-term storage, while the central region maintains sufficient thickness for adhesion. This local thickness variation prevents adhesive component protrusion even after extended storage periods.
Data Source
AI summary
An adhesive patch containing an adhesive patch main part containing a support and an adhesive layer laminated on the support, wherein the adhesive patch main part has a peripheral part, a central part, and an intermediate part between the peripheral part and the central part, the intermediate part of the adhesive patch main part has a thickness greater than that of the central part of the adhesive patch main part, and the central part of the adhesive patch main part has a thickness greater than that of the peripheral part of the adhesive patch main part, and a production method thereof.