In ultrasonic welding, which factors affect the weldability of thermoplastics?

Frequently Asked Questions

There are a number of factors that affect the weldability of thermoplastics in the context of ultrasonic welding. The main ones are:

• Polymer structure, i.e. is it amorphous or semi-crystalline?
• Polymer chemistry
• Melting point
• Melt flow rate

Other factors that may influence weldability include:

• Fillers
• Moisture
• Additives
• Mould release agents

Further information

Only available to Industrial Members of TWI: Ultrasonic welding of thermoplastics - a guide to best practice

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