Heat sealing production of the air bag inside the air massager

For the thermal fusion production requirements of internal airbag assemblies in pneumatic massagers, combining medical-grade TPU material properties with high-frequency welding technology, the following key solutions are proposed:

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I. Equipment Selection & Process Integration

1. High-Frequency Welder Specifications

   • Recommend 5000-15000W output power systems
   • Equip with 7T85RB/3069RB oscillator tubes
   • Support pneumatic/hydraulic pressure mechanisms to meet TPU airbag fusion strength requirements

2. Mold Design Guidelines

   • Customize split mold structures
   • Control clearance between moving core and fixed cavity at 0.02-0.05mm
   • Apply Teflon anti-adhesion coating on mold surfaces

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II. Material Treatment & Welding Parameters

1. TPU Film Pre-treatment

   • Use medical-grade TPU film (Shore hardness 85A-95A)
   • Implement plasma treatment (300W power, 30s duration) for surface activation

2. Welding Parameters

   • High-Frequency Welding:
     Frequency: 27.12MHz
     Mold temperature: 80-100°C
     Duration: 3-5 seconds

   • Ultrasonic Welding:
     Frequency: 20kHz
     Amplitude: 50-70μm
     Pressure holding: 2-3 seconds

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III. Quality Control Standards

1. Air-Tightness Verification

   • Pass 0.5MPa pressure endurance test (≥30s duration)
   • Maintain leakage rate <5ml/min

2. Weld Seam Evaluation

   • Achieve peel strength ≥8N/cm (per ASTM D1876)
   • Recommend dual-welding process for enhanced compressive resistance

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IV. Production Optimization

1. Spark Prevention

   • Install 5557 American-style spark protection system
   • Automatic power cutoff for abnormal high-frequency output

2. Automation Integration

   • Adopt high-frequency thermal fusion machines with rotary turntables
   • Enable continuous production with ≥40% efficiency improvement