Ultrasonic welding

Fast welding of plastics within seconds

In intermittent ultrasonic welding, one or more thermoplastic materials are joined together by internal friction and by friction in the joining zone (interfacial friction).

Ultrasonic welding is used wherever thermoplastics are used, and high demands are placed on the joining technology. Compared to other welding processes, ultrasonic welding is particularly suitable when fast process times with high process reliability are required or when no further additives or solvents are to be used. Ultrasonic welding is also characterized by the quality, strength and exact reproducibility of the weld seams.

Depending on the application, the welding results depend on various parameters. In ultrasonic welding, high-frequency mechanical vibrations cause molecular and interfacial friction in the joining zone. This generates the heat necessary for welding, and the material is plasticized. After ultrasonic exposure, homogeneous solidification is finally achieved in the joining zone by short cooling times while maintaining the joining pressure. In addition, both the geometry of the sonotrode and anvil and the design of the joining zone itself influence the welding result.

Advantages

• Welding of different thermoplastic materials according to their polymer compatibility, such as PP, PVC, PE, PET, ABS, composites, fabrics, nonwovens or films
• Very fast process times
• Very good process control and reliability by monitoring the welding parameters
• Selective energy supply by means of digital control of the welding process
• Constant welding quality with optically perfect and stable as well as reproducible weld seams
• Visually appealing weld seam design through individual anvil embossing
• Environmentally friendly technology
  • Low energy consumption during welding
  • No solvents and additives for welding
  • Pure recycling of the welded workpieces
• Cold welding tools
  • No machine warm-up times
  • No damage to the workpieces when stopping the machine
  • No damage or wrinkles on the welded material
  • No heating of the goods to be packed, e.g. in the packaging industry
  • Quick and easy change of welding tools
• Air- and liquid-tight welding seams
  • Waterproof welding of areas wetted with grease, oil or natural fibers
  • Ideal for sealing e.g. packaging in the food industry

 

Technologies

Ultrasonic cut & seal Ultrasonic roll seam welding Ultrasonic cutting Ultrasonic punching Ultrasonic riveting Ultrasonic embossing US thermofixing Ultrasonic washing Ultrasonic disintegration

Applications

• Blister packaging 
• Sporting goods 
• Velcro and loop tape 
• Steering column trim in automobile 
• Headlight cleaning system in automobile
• Bumper in automobile (park distance control holder)
• Stand-up pouch
• Tubular bag
• Spout
• Toys
• Reflectors
• Breathing filters and masks
• Filters
• Sanitary articles

Ultrasonic feed unit