Segmented Tape Prevents Lateral Cut Propagation
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Solution Overview
Problem
Tapes used under tensile load in the longitudinal direction are prone to cutting when a notch forms at the edge portion due to strength reduction or friction, leading to potential extension of the notch in the lateral direction.
Innovation Solution
A tape design featuring a bond portion on at least one surface with intermittent slit rows, where one slit row is parallel to another, and specific surfaces are designated as adhesive or non-adhesive to distribute stress and prevent lateral extension of cuts, including a base portion and reinforcement portions with alternating slits that reduce tear strength in the longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a notch is formed at the edge portion of the tape, then the tape structure is simple and easy to manufacture, but the notch extends in the lateral direction under tensile load causing the tape to be cut
Solution Approach 1:
The tape is divided into multiple segments by forming first and second slit rows that extend in the longitudinal direction. These slits segment the continuous tape structure into discrete sections, preventing the propagation of notches or cuts along the lateral direction. When a notch occurs at the edge portion, it is contained within a single segment between slits and cannot extend laterally to cut the entire tape, thus resolving the contradiction between manufacturing simplicity and cutting resistance.
2Device complexity
If the tape is made from a single continuous material, then the manufacturing process is simple, but the tape is prone to cutting when notches form under tensile load
Solution Approach 1:
The tape structure is segmented by introducing periodic slits in the longitudinal direction, creating a series of connected sections. This segmentation reduces the continuous load path that would otherwise allow notch propagation, while maintaining relative simplicity by using a single material composition and straightforward slit formation process.
Solution Approach 2:
The slit rows are positioned at specific locations within the tape width, creating local variations in structural properties. The regions between slits have different mechanical characteristics compared to the slit regions themselves, with the non-slit portions providing structural integrity while the slit portions act as stress relief zones that prevent lateral crack propagation.
Data Source
AI summary
A tape is provided having a long shape in which a bond portion is formed on at least one surface. The tape includes a first slit row including a plurality of slits formed intermittently along a longitudinal direction, and a second slit row including a plurality of slits formed intermittently along a longitudinal direction and parallel to the first slit row. A portion without having a slit formed in the first slit row is arranged so as not to overlap a portion without having a slit formed in the second slit row.