How to use an ultrasonic fabric sewing machine to process surgical gowns?

1. Material Preparation

Surgical gowns are typically made from PP non-woven fabric, SMS medical protective material, or laminated fabrics. Ensure materials are clean, undamaged, and pre-cut to size.

2. Machine Setup

1) Air Pressure Adjustment: Set pressure to 2–4 kg/cm² based on fabric thickness (usually 0.1–0.5mm). Excessive pressure may puncture the material.

2) Ultrasonic Frequency Calibration: Use the "Frequency Test" to adjust resonance, ensuring amplitude ≤50 and current ≤0.6A to prevent underperformance or overload.

3) Pattern Wheel Selection: Install specialised wheels to match functional requirements (e.g., fluid-resistant edges or elastic band fixation).

3. Processing Steps

1) Alignment: Position fabric edges precisely (<1mm) under the wheel using guide belts or laser alignment.

2) Ultrasonic Bonding:

Activate the wheel via foot pedal; ultrasonic vibrations (20–35kHz) generate friction heat for instant sealing.

Parameters: Speed 10–40m/min, indirect heating at 80–120℃ (prevents charring).

3) Integrated Trimming: Some models feature rotary blades to trim excess edges simultaneously.

4. Quality Inspection

(1) Seal Integrity: Manually test seams for delamination or cracks.

(2)Sterility: Post-process sterilisation (e.g., ethylene oxide or irradiation) ensures no contaminants are introduced.