Protrudent Push Cutter Blade for Adhesive Patch Edge Containment
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Solution Overview
Problem
Adhesive patches often experience issues with the pressure-sensitive adhesive layer protruding or flowing out during storage due to the cold-flow phenomenon, leading to adhesion to the package and sticky hands when trying to remove them.
Innovation Solution
A process involving a protrudent push cutter blade with a specific sectional shape is used to punch adhesive patches from a pressure-sensitive adhesive sheet, ensuring the adhesive layer is contained within the patch and not exposed at the edges, preventing protrusion or flow during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cutter is used to cut the pressure-sensitive adhesive sheet, then the adhesive patch can be produced, but the pressure-sensitive adhesive layer protrudes or flows out from the edge during storage
Solution Approach 1:
The protrudent push cutter blade is designed to push the pressure-sensitive adhesive layer toward the center side before the cutting edge separates the material. This preliminary action prevents the adhesive from protruding at the edge during subsequent storage, addressing the reliability issue while maintaining manufacturing precision
Solution Approach 2:
The invention changes the geometric parameters of the cutter blade by providing it with a protrudent shape and specific sectional configuration. This parameter change enables the blade to exert a pushing force on the adhesive layer, altering its position relative to the cut edge and preventing cold-flow protrusion during storage
2Reliability
If the pressure-sensitive adhesive layer is contained within the patch edges, then protrusion is prevented, but the release liner becomes difficult to peel off
Solution Approach 1:
The invention creates local quality differences at the patch edges by exposing a small portion of the adhesive layer edge. This localized exposure provides a starting point for peeling the release liner, making it easier to remove while the rest of the adhesive layer remains contained to prevent protrusion
Solution Approach 2:
Instead of completely containing the adhesive layer within the patch edges, the invention allows partial exposure of the adhesive edge. This partial action provides sufficient grip for peeling the release liner while maintaining adequate containment to prevent significant protrusion during storage
3Reliability
If additional steps are added to prevent adhesive protrusion, then adhesive layer stability improves, but production complexity increases
Solution Approach 1:
The invention merges the cutting function and the adhesive layer positioning function into a single cutter blade design. The protrudent push cutter blade simultaneously cuts the pressure-sensitive adhesive sheet and pushes the adhesive layer toward the center, eliminating the need for separate operations and reducing production complexity while improving reliability
Data Source
Figure 1~2B
Figure 3A~3B
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AI summary
The invention provides a process for producing an adhesive patch, which includes a step of preparing a pressure-sensitive adhesive sheet including a backing, a pressure-sensitive adhesive layer formed on at least one side of the backing, and a release liner disposed on the pressure-sensitive adhesive layer; and a step of punching an adhesive patch including a backing, a pressure-sensitive adhesive layer formed on at least one side of the backing, and a release liner disposed on the pressure-sensitive adhesive layer out of the pressure-sensitive adhesive sheet with a protrudent push cutter blade, in which, at at least an edge part of the protrudent push cutter blade, a cross-sectional shape of the protrudent push cutter blade, which is in a direction perpendicular to the direction in which the protrudent push cutter blade extends, has an angle a and an angle b, in which the angle a is larger than the angle b. The angle a and angle b in the sectional shape have the meanings described in the specification.