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ST 30

The demand for minimum inventory levels requires 'Just in time" (J.I.T.) manufacturing techniques. Tube filling and sealing lines must be capable of quick changeover from laminates to high and low density plastic tubes and back with perfect quality and reliability. Ultrasonic tube sealing offers this capability with added benefits not available with other systems.

Benefits of ultrasonic welding

Branson sealing systems are designed to be mounted as a station virtually on all types of filling machines, whether in-line or rotary. They require no warm-up time, since heat is actually applied to the being sealed.  Every tube goes through the prescribed weld cycle, so that stops and starts during the process will not produce heated or under heated tubes; this significantly reduces scrap. 

Since no other heaters or hot air streams are applied, the ultrasonic system is ideally suited for safely sealing tubes filled with low flash point materials such as products with a high alcohol content. The intense scrubbing action of the ultrasonic process disperses product to overflow such as stringers or splashes, which may occur during fill-ing. No other process has been so successful in eliminating this problem.

 

Advantages of ultrasonic sealing 

  • Universal: Adapts to virtually all filling machine styles. Seals both plastic and laminates tubes
  • Fast: Seals up to 80 tubes per minute
  • Reliable: Maintains high seal strength even when sealing through product overflow and contaminant's.
  • Economical: No time lost waiting for machine warm-up. Requires minimal electrical power.  
  • Compact: Actuator and power supply require minimal space.



The Model ST-30 eliminates the need to stop and change tooling when changing from high to low density plastic tubes or laminates. A simple one-minute adjustment to the actuator permits sealing a variety of tube sizes and materials. Far less operating energy needed for ultra-sonic tube sealing than for other sealing methods. When the unit is operating at full power, 700watts are generated during the weld cycle, which is typically under one half second in duration. While the machine is “idling” (not actually welding a tube), the power draw is only about 10 watts.

 

How ultrasonic sealing works

The Model ST-30 ultrasonic tube sealer is designed to be mounted onto virtually all styles of filling machines. As the tube is advanced to the ultrasonic tube sealing station, a switch closes to initiate the weld cycle. Air is directed into cylinders to advance the weld anvil and ultrasonic horn towards the center line of the tube. The tube is closed to a preset gap and held for the applica-tion of sonic energy. An ultrasonic power supply takes the 50/60 Hz electrical energy and converts it to 30,000 cycles per second thorough a power oscillator. This high frequency electrical energy is applied to the convertor which transforms the electrical current to high frequency mechanical vibrations. The sonic energy causes the horn to vibrate against the tube end at 30,000 cycles per second. The intense vibration disperses any contamination from the seal area and generates heat to bond the material. The energy is then stopped and the tube is held closed for a brief time (typically .05 to .150 seconds). Then the tube goes to the next station on the filling line. Typically cycle times range from 45 to 80 units per minute, depending on tube diameter and material.

 

Mounting options

  • Model ST 30
  • Model ST 30 Rotary
  • Model ST 30 CDC
  • Model ST 30 M

 

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