Thanks to its speed and bonding accuracy, light curing is one of the most exciting adhesive bonding technology. To prevent unwanted effects on production processes, users are advised to consider the issue of scattered light.
Scattered light is diffused light that occurs when light is reflected from interfaces. In production environments, for example, it is produced by neon tubes on the ceiling or by the sun shining through skylights.
As is well known, light-curing adhesives and encapsulants contain a specific raw material, the photoinitiator. When (scattered) light of a certain wavelength hits the photoinitiator, it decomposes and starts the curing reaction.
In the case of a high-intensity LED lamp such as DELOLUX 20, the adhesive fully cures within only a few seconds. The intensity of scattered light is, of course, much too low to fully cure an adhesive. However, in the long run, it may cause partial clogging of the dispensing needle. Needle clogging often leads to the formation of drops, causing undesirable dispensing results.
Watch this video to learn how to protect your UV curing process from scattered light, how to increase bonding quality, and how to reduce maintenance.