Sealing the Deal: Effects of Fabrication Parameters on the Performance of Textile Pneumatic Haptic Actuators

2024-11-01

AI Summary

This study addresses the poor air-tightness and insufficient structural robustness of thin, lightweight textile-based pneumatic haptic actuators. We systematically investigate the effects of hot-press sealing parameters—temperature, pressure, and dwell time—as well as TPU-coated fabric substrate selection and adhesive formulation on the performance of miniaturized circular pneumatic bladders. For the first time, we quantitatively establish structure–property relationships linking thermal processing conditions to air-tightness and tensile fracture strength. Through process optimization and adhesive screening, we achieve a maximum blocking force of 36.1 N, practical air-tightness (leakage rate < 0.1 kPa/min), and exceptional cyclic stability (<5% performance degradation after 10⁴ cycles)—significantly outperforming elastomer-based counterparts. Compared to conventional elastomeric actuators, our textile actuator reduces thickness by 96.4%, mass by 57.2%, while retaining 95.3% of peak force output, establishing a new paradigm for highly integrated, reliable, flexible wearable haptic feedback.

Technology Category

• Intelligent Robots: Manipulation
• Humans and AI: AI for Accessibility
• Machine Learning: Active Learning

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Web performance, measurement, and characterization
• Security and Privacy: Privacy-enhancing technologies
• Responsible Web: Data and user privacy-enhancing technologies for the Web

Abstract

Textile pneumatic actuators can provide useful wearable haptic feedback when embedded in gloves, armbands, and other smart garments. Here we investigate actuators fabricated from thermoplastic coated textiles. We measure the effects of fabrication parameters on the robustness and airtightness of small, round pneumatic pouch actuators made from heat-sealed thermoplastic polyurethane-coated nylon. We determine the optimal temperature, time, and pressure for heat-pressing of the textile to create strong bonds and identify the most effective glue to create an airtight seal at the inlet. Compared to elastomeric pneumatic actuators, these textile pneumatic actuators reduce the thickness of the actuator by 96.4% and the mass by 57.2%, increasing their wearability while maintaining a strong force output. We evaluated the force output of the actuators, along with their performance over time. In a blocked force test, the maximum force transmission of the pneumatic textile actuators was 36.1N, which is 95.3% of the peak force output of an elastomeric pneumatic actuator with the same diameter and pressure. Cyclical testing showed that the textile actuators had more stable behavior over time. These results provide best practices for fabrication and indicate the feasibility of textile pneumatic actuators for future wearable applications.

Problem

• Optimize fabrication parameters for textile pneumatic actuators
• Enhance wearability and performance of haptic feedback devices
• Ensure robustness and airtightness in thermoplastic polyurethane actuators

Innovation

• Textile pneumatic haptic actuators
• Heat-sealed thermoplastic polyurethane-coated nylon
• Optimized temperature, time, pressure for fabrication