Application of Ultrasonic Cutting Technology in Flexible Materials and the Food Industry

Ultrasonic cutting applies high-frequency blade vibration (typically 20–40 kHz) to sever materials with minimal force and deformation. This “micro-sawing” action is particularly transformative for flexible materials and heat-sensitive food products that resist clean separation by conventional blades.
 
Experimental data quantifies the force reduction. A prototype ultrasonic hand cutter operating at 27,888 Hz with 36 μm amplitude reduced cutting force by 34.5% for cheese and 59.4% for ham compared to unexcited cutting. For bakery products, increasing the maximum vibration speed at the cutting edge produces a proportional reduction in separation force, with the magnitude of reduction depending on each material’s specific mechanical properties.
 
Quality outcomes distinguish ultrasonic from conventional cutting. In fresh-cut apple trials, ultrasonic cutting at 30–50% amplitude yielded denser, smoother surfaces with less cell damage than control cuts. Polyphenol oxidase (PPO) activity was lower in ultrasonic-cut samples, indicating reduced browning during 2-week refrigeration storage. For flexible materials, the vibrating blade simultaneously cuts and seals synthetic fabric edges, preventing fraying without the deformation caused by mechanical pressing.
 
The limitations are practical: capital costs are higher than conventional cutting systems, and parameters must be tuned per material. Yet for sticky, compressible, or multi-layered products where appearance and yield matter, ultrasonic cutting offers a precision that traditional blades cannot match.