Cyanoacrylates dispensing systems

This guide provides a full explanation of the cure mechanisms and discusses the performance benefits for four types of engineering adhesives (cyanoacrylates, epoxies, two-part acrylics and UV curing adhesives). There are also chapters on joint design, dispensing systems, the surface preparation for difficult plastics and information on several Other adhesive technologies. 

Cyanoacrylates can be dispensed precisely, cleanly and reliably using a range of dispensing equipment, ranging from simple hand-held dispensers to fnlly automatic systems incorporated into purpose-built special production equipment. 

The adhesive is put under pressure and the dispense valve is opened for a certain time to provide the correct quantity of adhesive (see Figure 10.15). Since the cyanoacrylate contacts the pressurised air, the dryness of the air is important and an air filter on the mains air line is recommended. A pressure/time system is best suited for cyanoacrylates up to a viscosity of 5,000 mPa-s, i.e., self levelling products. 

Cyanoacrylates can be dispensed via a syringe system although care is required to ensure that the follower bung does not bond itself to the side walls of the syringe as the product is dispensed. Higher viscosity or gel products are generally more suited for... 

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