Syringe and Needles Application

For the bonding of very small parts — electronic parts, micromechanics, watches — adhesives may be applied in very small quantities with a metering syringe or a fine needle. For instance, a fraction of a milligram of adhesive may be applied on small surfaces (less that 1 mm ). 

Several companies manufacture syringe applicators which may be used in manual or automatic modes, such as Fisnar USA, Electron Fusion Devices EFD, Wentworth and Kent Moore (Fig. 5). 

6 to 8 show many applications of these application equipment, in many industries, especially those where the adhesive must be applied on a small surface, or as a dot, such as electronics, Hifi, micromechanics, small appliances, jewellery etc. 

The syringe may be held in the hand of the worker, but the application of the drops may be actuated by pulsed air. In manual mode, the pressure on the syringe is applied continuously and the adhesive will flow as long as the operator presses 

Sealing of automotive head lamps (bonding plastic lens to plastic casing) 

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