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Ultrasonic Film Welder, 40 to 70 kHz, 50 to 150 W (New)

Description

  1. Core Process Parameters
    1. Frequency: 40 to 70 kHz (ideal: 60 to 70 kHz). Higher frequencies equal smaller vibrations, safer for thin materials.
    2. Amplitude: 5 to 20 µm (start at 8 µm). Film-grade welding stays on the low end to avoid material rupture.
    3. Power at the horn: 50 to 150 W. Thin films weld with minimal energy; higher wattage increases burn risk.
    4. Weld time: 10 to 100 ms. PE/PP seals typically form in short pulses; longer times risk over-melting.
    5. Clamp pressure: Very low, just enough to couple. Overclamping distorts ultrathin films; slight pressure is enough to transmit sound.
  2. Equipment Specification Benchmarks
    1. Generator: Digital, closed-loop control with energy, amplitude, and power feedback. Typical units are rated at 150 W (40 kHz) or 200 W (60 kHz).
    2. Actuator: Servo or pneumatic actuator capable of force resolution under 5 N, and position repeatability better than 2 µm.
    3. Sonotrode (horn): Narrow face, polished to below 0.2 µm Ra, with no sharp edges. Designed for low-melt-point resins like PE and PP.
    4. Anvil (nest): Polished, flat, and hardened. May include vacuum hold-down or micro-texturing to support film during vibration.
  3. Material-Specific Notes
    1. Polyethylene (PE): Melts at lower temperature, so use lower amplitude and shorter weld time.
    2. Polypropylene (PP): Slightly more robust than PE; allows approximately 10% higher energy if weld fails to form.
    3. Multilayer films or coated webs: Always test—coatings may reflect ultrasonic energy or change heat absorption characteristics.
  4. Setup and Tuning Procedure
    1. Dry fit film between horn and anvil with no vibration. Confirm tension, flatness, and alignment.
    2. Initial settings: Frequency at 60 kHz, power at 60 W, amplitude at 8 µm, time at 20 ms, pressure low enough for coupling only.
    3. Visual inspection: Check weld seam for thinning, punctures, or flashing using 10x magnification.
    4. Adjust amplitude: Increase in 1 µm steps up to 20 µm if weld is weak.
    5. Adjust time: If amplitude is maxed out, add time in 5 ms steps.
    6. Adjust power: Only increase wattage as a last resort. Keep below 150 W unless tooling requires more.
    7. Record process parameters: Log peak power, energy used, weld displacement, and force for repeatability.
  5. Quality Control Recommendations
    1. Peel and burst testing: Use peel strength or internal pressure to validate seal.
    2. Microscopy: Confirm melted zone thickness is within 10% of film thickness.
    3. SPC monitoring: Track power, time, and energy to detect tool wear or drift.
  6. Quick Reference Table
    1. Frequency: Recommended start at 60 kHz, adjustment range 40 to 70 kHz.
    2. Power: Recommended start at 60 W, adjustment range 50 to 150 W.
    3. Amplitude: Recommended start at 8 µm, adjustment range 5 to 20 µm.
    4. Weld time: Recommended start at 20 ms, adjustment range 10 to 100 ms.
    5. Clamp force: Minimal, increase only if needed.
  7. Verified Sources
    1. Herrmann Ultrasonics – Ultrasonic Welding of Plastics.
    2. Sonics & Materials – Precision Plastic Welders (40 to 70 kHz).
    3. Plastics Decorating Magazine – Choosing the Right Frequency for Ultrasonic Welding.
    4. Nippon Avionics HW-D Series – 200 W, 60 kHz Generator Specs.
    5. Smart Card Welder Specifications – 100 W at 60 kHz, Thin Film Certified.
    6. Herrmann – Ultrasonic Film Sealing: Time and Energy Parameters.
    7. Dukane – Welding Thin Packaging Films: Clamp Force & Process Window.