Programmable Adhesion via Nonlinear Kirigami Cuts
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Solution Overview
Problem
Current adhesive structures, such as films and tapes, face challenges in achieving scalable, economical, and efficient fabrication methods that allow for programmable adhesive properties, particularly in enhancing adhesive strength and ease of release, while maintaining flexibility and resistance to deformation.
Innovation Solution
The development of adhesive systems with nonlinear cuts, using techniques like digital laser cutting, allows for precise control of cut patterns across various scales, enabling programmable adhesive properties along the length and width of the strip, with alternating patterned and unpatterned regions that enhance adhesive strength in specific directions and facilitate easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If linear cuts are used in adhesive structures, then fabrication is simple and scalable, but adhesive strength enhancement and directional release control are limited
Solution Approach 1:
The patent applies curved and non-linear cut patterns instead of straight linear cuts. The kirigami-inspired structures feature curved edges and nonlinear geometries that enhance adhesive strength by creating more complex deformation modes during peeling, while the curvature allows for directional control of release properties.
Solution Approach 2:
The adhesive structure is divided into multiple alternating regions with different cut patterns (patterned regions with nonlinear cuts and unpatterned regions without cuts). This segmentation allows different zones to provide different adhesive functions, enabling both strong adhesion in patterned regions and easy release in unpatterned regions.
2Adaptability or versatility
If patterned regions with nonlinear cuts are introduced, then adhesive properties can be tuned spatially and directionally, but fabrication complexity increases
Solution Approach 1:
The patent uses a universal fabrication approach where a single substrate material and cutting process can create multiple functional regions with different adhesive properties. The same kirigami cutting technique applied to different regions produces both strong adhesion and easy release functions, making the manufacturing process versatile rather than requiring multiple specialized processes.
Solution Approach 2:
Different regions of the adhesive structure are given different local qualities through varying cut patterns. Patterned regions have nonlinear cuts for enhanced adhesion, while unpatterned regions remain without cuts for easy release. This local differentiation allows spatial tuning of adhesive properties across the structure.
3Ease of operation
If alternating patterned and unpatterned regions are used, then directional release is enabled, but structural homogeneity is reduced
Solution Approach 1:
The patent introduces asymmetry by alternating between patterned regions with nonlinear cuts and unpatterned regions without cuts. This asymmetric composition creates directional release properties where peeling in certain directions encounters different resistance levels, enabling controlled easy release in specific orientations while maintaining overall structural integrity.
Data Source
AI summary
The invention relates to an adhesive system comprising a fabricated structure having alternating regions that are unpatterned and patterned along its longitudinal length. Patterned regions have at least one subregion with a non-linear cut relative to the transverse direction across the width of the structure. The geometry, location of the subregion(s), number of nonlinear cuts, and other parameters allow tuning as well as pinpoint programming of the adhesive properties either along the entire width and length or the strip or just at pinpointed subregions of the strip. Such tuning can include not only adhesive strength, but its adhesive strength in certain peeling directions.