Polymeric Tape Edge Tear-Cuts for Clean Manual Tearing
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Solution Overview
Problem
Polymeric tapes often stretch or tear unevenly when manually segmented, leading to issues like waves, loss of adherence, and excessive length, especially when using scissors or knives, and can be difficult to tear due to their rigidity.
Innovation Solution
Incorporation of micro tear-cuts along the longitudinal edges of the facestock and support liner, which facilitate clean tearing by guiding the tear path and preventing excessive stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual force is used to rip or tear tape from a roll, then the tape can be segmented without tools, but the tape stretches and becomes distorted with waves and loss of adherence
Solution Approach 1:
The tape is pre-segmented with tear-cuts at regular intervals along its length. These pre-formed cuts divide the continuous tape into manageable sections that can be easily separated by manual tearing, eliminating the need for scissors or knives while preventing excessive stretching and distortion.
Solution Approach 2:
Tear-cuts are pre-formed into the tape during manufacturing, creating predetermined weak points along the longitudinal edges. This preliminary action enables users to easily tear the tape at any point by applying minimal force, as the tear will propagate cleanly along the pre-cut lines without causing distortion or wave formation.
2Manufacturing precision
If scissors or a knife are used to segment tape, then a clean cut can be achieved, but the process becomes more complex and time-consuming
Solution Approach 1:
The tape incorporates pre-formed tear-cuts that segment the material into easily separable sections. This eliminates the need for external cutting tools like scissors or knives, as the tape can be cleanly segmented by manual tearing along the pre-cut lines, reducing device complexity while maintaining cut cleanliness.
Solution Approach 2:
The tape structure itself provides the cutting function through pre-formed tear-cuts. Instead of requiring external tools to perform the cutting action, the tape is designed to self-segment through manual tearing, making the cutting function inherent to the tape structure rather than requiring separate equipment.
3Strength
If rigid polymeric films are used, then tear resistance is improved, but manual tearing becomes difficult
Solution Approach 1:
The tape has non-uniform structural properties: the bulk material maintains high strength and tear resistance for normal use, while localized tear-cuts are introduced at specific positions along the longitudinal edges. These local modifications create predetermined weak points that facilitate easy manual tearing without compromising the overall strength and tear resistance of the tape when intact.
Data Source
AI summary
A polymeric tape comprises a facestock extending lengthwise, the facestock including a polymer. An adhesive layer is on a first surface of the facestock. Tear-cuts are formed into at least one longitudinal edge of the facestock and extending inwardly, the tear-cuts being provided all along the at least one longitudinal edge of the facestock.