Release Liner Convex Geometry for Adhesive Positioning
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Solution Overview
Problem
Existing adhesive sheets take too long to develop strong adhesive force, leading to potential shifting during attachment, and have difficulty in repositioning due to small valley widths and large convex contacts.
Innovation Solution
A release liner with concave portions that narrow towards the deepest part and a convex sectional shape between them, where the width at half the height is greater than the height, is used to reduce the contact area and facilitate early strong adhesive force development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If minute protrusions are formed on the adhesive layer surface, then adhesive force develops strongly after attachment, but contact area is reduced too quickly causing positioning shifts
Solution Approach 1:
The invention inverts the conventional approach by forming concave portions (recesses) instead of protrusions on the release liner surface. This inversion creates convex portions on the adhesive layer that contact the adherend, while the concave portions create gaps. The inverted geometry achieves both positioning ease (through larger gap widths) and strong adhesive force development (through convex contact areas).
Solution Approach 2:
The invention applies local quality by creating specific convex portions with controlled dimensions (width w at height h/2 where w>h) on the adhesive layer. These convex portions are strategically formed to provide localized contact areas that balance positioning ease with subsequent adhesive strength, while concave portions provide gap regions for air discharge and bulge prevention.
2Speed
If valley portions with small width are formed on adhesive layer, then adhesive sheet attaches immediately to adherend, but repositioning becomes difficult
Solution Approach 1:
By inverting the valley portion concept into convex portions formed on the adhesive layer (rather than recesses in the adhesive), the invention creates larger contact areas that allow immediate attachment while the gaps between convex portions maintain repositioning ability. The convex geometry provides broader contact than narrow valleys would allow.
3Strength
If convex portions with large contact area are formed, then strong adhesive force develops, but positioning becomes difficult due to immediate attachment
Solution Approach 1:
The invention segments the adhesive layer contact surface into multiple discrete convex portions separated by gaps (corresponding to concave portions on the release liner). This segmentation allows the adhesive to contact the adherend at multiple distributed points, providing strong overall adhesive force while the gaps between segments allow for air discharge and reduced initial contact resistance, facilitating easier positioning.
Solution Approach 2:
Each convex portion is designed with specific local dimensions (width w at height h/2 where w>h) to optimize the local contact area for adhesive strength while the spacing between convex portions creates gaps that facilitate positioning. The local quality of each convex region is tailored to balance attachment strength with positioning ease.
Data Source
AI summary
[Problem] A release liner and an adhesive sheet with which contact area of an adhesive layer on an adherend is reduced at positioning and adhesive force can excellently develop at the adhesive layer after positioning are provided.[Solution] A release liner 100 has a surface 101 at which concave portions 120 are formed. The concave portion narrows toward a deepest part 121, and a portion 110 between the concave portions has a convex sectional shape in a thickness direction D1 of the release liner. The convex sectional shape narrows at a continuous tilt from the deepest part to an apex 111 of the convex sectional shape, and in the convex sectional shape, a width w at a height of ½h, which is half of a height h, and the height h have a relation of w>h.