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AdhFAST - Adhesive injection fastener

Connect, no. 105, March/April 2000, p.3

TWI has just filed a patent on its latest joining system - AdhFAST TM . This novel, three-in-one fastener, allows adhesive to be injected through the middle of the device whilst retaining the joint and controlling the gap between the substrates, ie the bondline thickness.

Although hybrid joints - the combination of fasteners or weld points and adhesives - are not new, this process is unique in that components can be assembled dry, checked for tolerance and then injected with adhesive at the final stage. This ensures a simplified process with increased quality control, maximising the benefits of hybrid joint technology.

Adhesive dispensing can be metered with minimal wastage, making the process cleaner with resultant health and safety and economic benefits.

Computer simulated graphics showing cross sections of AdhFAST TM in-situ and exploded views
Computer simulated graphics showing cross sections of AdhFAST TM in-situ and exploded views
Computer simulated graphics showing cross sections of AdhFAST TM in-situ and exploded views

It is envisaged that all industrial sectors such as aerospace, marine, building, construction and transport could benefit from AdhFAST in terms of improved performance and cost savings. The utilisation of such fasteners enables the advantages of adhesives to be combined with the benefits and confidence associated with fastener technology.

The prototype fasteners have been made in aluminium alloy, but any material with appropriate structural properties including other metals, plastics, and composites, could be used. The injection of the adhesive can be carried out manually or by an automated process, making it ideal for large volume production.

For more information, contact Ewen Kellar. E- mail: ewen.kellar@twi.co.uk

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