Segmented Sharp Points for Safe Liner Removal from Adhesive Tape
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Solution Overview
Problem
Existing tools for removing secondary liners from pressure-sensitive adhesives on two-sided tapes often damage the adhesive layer, and there is a need for a method that can safely peel the liner without causing unintended adhesion or damage.
Innovation Solution
A hand-held tool with a plurality of sharp points that penetrate the secondary liner surface, allowing for controlled peeling by rotating the tool to lift the liner from the adhesive, utilizing a geometric design with a handle and pointed members to distribute force effectively and prevent tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blade or wedge is used to pass between the carrier and liner, then the liner can be separated from the adhesive, but the adhesive layer is damaged
Solution Approach 1:
The single cutting edge is segmented into multiple discrete cutting points (at least three) arranged in a triangular pattern. This segmentation distributes the separation force across multiple points rather than concentrating it at a single location, preventing damage to the adhesive layer while effectively separating the liner from the carrier.
Solution Approach 2:
The cutting elements are designed with specific geometric properties (triangular arrangement, spacing between 0.5-2.0 mm) that create localized stress concentrations at the liner-adhesive interface. This local quality ensures effective liner separation while the distributed nature of the multiple points prevents excessive stress on any single area of the adhesive layer.
2Device complexity
If manual removal of the secondary liner is attempted, then no special tools are needed, but the liner is challenging to remove and may cause unintended adhesion
Solution Approach 1:
The multiple cutting points automatically engage the liner material as the tool is applied, with the geometry of the arrangement ensuring that the cutting action initiates without requiring precise manual positioning or complex manipulation. The tool performs the separation function through its inherent design rather than requiring skilled operator technique.
3Productivity
If force is applied to peel the liner from the adhesive, then the liner can be removed, but tearing or delamination may occur
Solution Approach 1:
The separation force is divided and applied at multiple discrete points (at least three cutting points) rather than concentrated at a single location. This segmentation allows the liner to be peeled away in controlled segments, maintaining liner integrity while achieving efficient removal. The triangular arrangement ensures uniform force distribution across the separation front.
Solution Approach 2:
The cutting points are spaced at a specific distance (0.5-2.0 mm) that provides sufficient separation force to overcome the adhesive bond while maintaining enough spacing to prevent excessive stress on any single point of the liner. This partial action approach achieves complete liner removal without applying excessive force that would cause tearing.
Data Source
AI summary
A hand tool is provided for removing a secondary liner from a tape carrier of a two-sided adhesive tape where the opposing primary side of the tape carrier is attached to a surface. The hand tool includes a handle. One end of the handle may include a handle fulcrum depending from the handle. A plurality of sharp points together define a mathematical line. The plurality of sharp points also define point axes which together define a mathematical plane. The mathematical line is coincident with the mathematical plane. The mathematical plane defines an acute angle with respect to the handle and to the handle fulcrum.