The alternative is an LED UV curing lamp , which differs by emitting narrow spectrum UV light .
For manufacturers establishing new processes , LED UV curing is usually the recommended option . The range of adhesives suitable for curing with narrow spectrum LED UV light is increasing all the time . Process control is much easier with LED UV lamps , as they offer more consistent output — up to or exceeding 20,000 hours . On the other hand , mercury arc lamps have a typical life of 2,000 hours , degrading throughout this period . LED curing lamps have no bulbs to change , which removes the need to pay for replacements . They run at lower temperatures , helping to avoid thermal rise and substrate damage .
LED lamps have no warm-up or cooldown time , so the manufacturer can turn them on , as and when needed , using them immediately . In contrast , the warm-up and cool down time associated with a broad spectrum lamp means that manufacturers leave them running all day , with the increased power consumption . The 20,000 hour life of an LED curing lamp therefore represents 20,000 hours
of curing time ( in practice many years ), whereas the lifespan of a mercury arc lamp refers to running time .
LED UV curing lamps are attractive because of better process control and low running costs . However , if you are looking to switch from a mercury arc lamp to an LED UV lamp , it may not be as simple as a straight swap . It is important to ensure that your adhesive cures effectively with the narrow spectrum output ; some , especially those designed for broad spectrum cure , will cure with unexpected characteristics .
If you are already operating a mercury arc process , you may need to consider how often you are changing your bulb , the price of the bulbs , the downtime for bulb changes , and the cost of monitoring the output of the bulb , and calculate whether upgrading to an LED curing lamp will deliver an appropriate ROI .
For manufacturers who can change their adhesive , consider whether you are trying to reduce costs , solve a technical problem , or both . Because switching adhesives may require revalidation , it is typically done by businesses with a strong commercial or technical drive for the change . Some examples may be supply issues , a change in the regulatory environment , or a product update involving new substrates or bondline design .
CONCLUSION
A UV curing adhesive can deliver good return on investment . It is important to take a holistic view , considering productivity , quality , yield , throughput , energy , H & S and similar factors in the calculation ; material and equipment costs are often offset by these other benefits and the resultant savings . The materials offer fast , on demand curing , and can be easily combined with automation to further improve throughput and yield . Whether you are considering UV curing materials for a new or existing process , it is important to consult with someone who can talk you through the specifics .
For more information on establishing a UV curing process , visit www . intertronics . co . uk / product-category / uv-equipment /, where you can access our top tips for getting the best from your UV curing process .
For further information , please visit / www . intertronics . co . uk
Issue 51 PECM 29