LabTech July/August 2015

By Staff

AR – TO DO OR NOT TO DO…

When it comes to AR Coating, proper lens preparation is critical. Shortcuts here will no doubt result in added spoilage.  You need to be sure that you are cleaning and preparing the lens appropriately and to the OEM guidelines for your coating machine(s). A good ultrasonic cleaning to surface etch is no doubt one of the easiest things to do – that and drying the lens in an oven for the right amount of time based on the lens material.  Be sure your surface is prepared properly or you will have issues with the coating once it comes out of the chamber.  Another sure fire tactic to ensuring you are getting a high-quality and durable coating is matching the AR coating stack with the hard coat you apply—whether it’s a backside spin coating or a thermally cured dip coating. At Schneider we call this our “Fingerprint Analysis”, this has to be done when preparing your AR stack recipes whether they are branded or private label coatings. Otherwise you can run into adhesion issues. You should send sample hard coated lenses to your AR supplier. Your AR coating supplier should then be able to analyze your hard coat properties and customize AR coating layers to best match the properties of the hard coat. If you are just starting to get into coating or have been at it for a while, this is a great exercise to go through annually to ensure your AR and hard coat are properly matched up. A solid foundation on your lens leads to a high-quality and durable coating. Kevin Cross, director of sales, North America, Schneider Optical Machines, Inc

THE EVOLVING AR

The coating industry is ever-evolving and to remain at the forefront, Satisloh continually advances their offerings in machinery, process and production knowhow. Over 40 years ago Satisloh engineered the first coating chamber with an auto flip-over system so operators didn’t have to open the chamber door and turn lenses manually, eliminating an opportunity for scratched or broken lenses. We introduced the X-Series in 2010, providing coating systems that offer unparalleled ease-of-use and productivity. The X-Series have 20 percent faster processing times than previous generations, for 10 percent higher productivity per shift. Our newest release, the MC-280-X is smaller than the MC-380-X, but brings to the small lab market a machine with a smaller foot print and lower front-end cost, yet still the same great ease-of-operation and reliability as its big brothers. The MC-280-X delivers today’s complex coating processes and top tier brands in a smaller package.

To contend in today’s market, coatings must have a high scratch resistance and be easy to clean. Front side scratch resistance is provided with factory-applied hard coating. On the backside, a solvent-based spin hard coating applied with our Magna-Spin provides ultimate performance. Ease-of-cleaning comes from premium top coat solutions with oleophobic properties like our Satin. Adding a conductive layer gives an antistatic property to the AR, helping keep lenses clean longer by repelling highly charged airborne particles, which would otherwise stick to the surface due to static.

Consumers are using computers and hand-held devices that emit blue light, which is harmful to eyes. This led us to develop protective, blue light blocking coatings. Additionally we have created a coating that reduces the amount of damaging UV light that gets reflected into the eyes off the back surface of lenses.  Satisloh continues to lead innovation to meet the demands of our customers in a changing world. Brian Peterson, director of coating, Satisloh


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