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Improvements in Light Curing Adhesive Technology Speed Up Manufacturing Cycle Times

Posted on 1/16/2020 8:15:57 AM By ASC
  

A large number of industries rely on one or two component adhesives to achieve the bonds required in their manufacturing field. But with one component products taking anything from half an hour to an hour and a half to reach final strength using heat curing, and slow-curing two-part formulations causing a 24 hour delay in production while the bond reaches final strength, manufacturers are starting to literally see the light. They are also seeing the advantages of its ability to cure adhesives, sometimes within a single second.

However, certain issues placed a question mark on the intrinsic strength and reliability of the curing. This has led to new developments in the chemistry behind light-curing which allow for a wider range of materials and light-curing products to be used, and others to be developed that will ensure successful and total curing while speeding up adhesive cycle times.

One result has been increased use of dual-curing products which lessen the chances of certain shadow areas being left uncured; and others have taken the route of making necessary adaptations.

These include overriding the idea that only transparent adhesives can be light-cured. For successful light-curing of black adhesives the required layer thickness has been addressed, and a humidity curing portion has been included to trigger crosslinking in shadow areas.

Pre-activation with light curing has provided a way to save some of the time benefits when  bonding opaque materials which don’t allow the light to reach the adhesive. This is done by applying the adhesive to only one of the two components being bonded, and immediately irradiating it before joining it to the other component.

Using high-intensity LED curing lamps has increased the speed of the adhesive cycle through continuous improvements in these light curing technologies.



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