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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

PPMA Show 2020

NEC, Birmingham(B40 1NT)

28/09/2021 - 30/09/2021

PPMA Show 2020 is the UK’s largest ever event dedicated to state-of-the-art processing and packaging (more)

Don't get stuck over which adhesive to use

Don't get stuck over which adhesive to use The use of engineering adhesives has enabled many companies to save time and money, but how do they work, and which is the best type to use for a given application? Two major steps are involved in adhesive bonding. The first is for the adhesive to wet completely both of the surfaces to be bonded to enable the adhesive to be in close molecular contact with the surfaces. The second stage in the formation of a bond is the curing - or hardening - of the adhesive. There are four accepted 'mechanisms of adhesion', only one of which - the Adsorption Theory - is widely used. This theory explains that adhesion occurs because of the interatomic and intermolecular forces established between the atoms and molecules in both the adhesive and the surface. The second theory of bonding is known as Mechanical Interlocking and involves the mechanical keying of adhesives into the roughened surfaces. Within the engineering context, this process is important for the retaining of metallic cylindrical components. The third mechanism for adhesion is known as Diffusion. Here a solvent-based adhesive dissolves the surfaces of the substrates so that they fuse together. Finally, there is the Electrostatic Theory. This relates to adhesion caused by the net positive charge and a net negative charge giving a force of attraction. In many cases, adhesives offer improved performance over mechanical methods. Processes can be automated, they make on-site maintenance methods easier, and they often allow inventories of fasteners, gaskets and the like to be reduced. All of which means engineers have good reason for using adhesives. But, like just about every other task in life, the correct selection of tools for the job is required to get the very best results when it comes to joining together components. It's simply a case of choosing the one that suits the circumstances.
 

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