Segmented Release Liner for Pressure-Sensitive Adhesive Patches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet-shaped patches face challenges in preventing the pressure-sensitive adhesive surface from being exposed due to slight stress before use while also ensuring easy splitting of the release liner, leading to potential attachment to unintended areas or exposure of drugs incorporated in the adhesive layer.
Innovation Solution
A sheet-shaped patch design featuring a backing with a pressure-sensitive adhesive layer and a release liner having a parting line composed of alternately arranged cut lines and connection parts, where the cut lines are oriented to allow easy separation of the release liner into distinct regions, preventing exposure of the adhesive surface and facilitating easy splitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the release liner is completely split before use, then easy separation is achieved, but the pressure-sensitive adhesive surface may be exposed through gaps in the cut line
Solution Approach 1:
The release liner is divided into multiple segments through cut lines that extend partially from the edge, creating a dashed-line pattern. This segmentation allows the liner to be easily torn apart while maintaining coverage of the adhesive surface when intact. The cut lines are positioned and designed so that when the liner is fully attached to the backing, the gaps between cut line ends do not expose the adhesive surface.
Solution Approach 2:
The cut lines are pre-formed in the release liner during manufacturing, preparing it for easy separation at the time of use. The cut lines extend from the edge toward the center but stop before reaching it, creating predetermined weak points that facilitate clean separation when needed, while maintaining integrity and protection during storage and handling.
2Strength
If the release liner is made thick for easy handling, then durability is improved, but splitting becomes difficult
Solution Approach 1:
The release liner incorporates cut lines that create segmented sections, allowing a thick and durable liner to be easily separated. The cut lines provide predetermined separation paths that require minimal force to complete the split, even when the overall liner thickness provides durability during handling and attachment.
Solution Approach 2:
The release liner has non-uniform properties: the bulk material maintains sufficient thickness for durability and handling, while the cut line regions create localized weak points that facilitate easy separation. This local variation in structure allows the liner to be both strong when intact and easy to split when needed.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3D
AI summary
The present invention relates to a sheet-shaped patch including a pressure-sensitive adhesive layer on one surface of a backing to provide a pressure-sensitive adhesive surface showing adhesiveness at ordinary temperature and further including a release liner covering the pressure-sensitive adhesive surface. More specifically, the present invention relates to a sheet-shaped patch where the release liner is formed in a state of being splittable by a parting line. The patch ensures that the pressure-sensitive adhesive surface can be kept from being largely exposed due to slight stress before use and at the same time, the release liner can be easily split when using the patch.