Is there anyone who is able to provide me with any information on how we could apply a anti-slip coating over our super hydrophobic coated lenses?
We have tried numerous blocking pads, and the best is from Essilor and Weco, but we need something more substantial as our loss on wasted lenses is getting out of control.
If someone can give me a supplier who provides a coating or a special pad that we can use, I would be very interested.
Thanks
I have tried these as we use a super hydrophobic and they seem to work great.
see www.optochemicals.com
Non slip "HOOKER" blocking pads, the Latest Invention From OMS Opto Chemicals
We tried the Hooker pads and are completely satisfied with them. Ask Chris Ryser for samples.
Chris,Originally Posted by AWTECH
Can I get a sample of this product to try?
Judy Canty
Of course.......................
Of course Judy,
Just send me an e-mail as well anybody else who wants some Hooker pad samples, at oms_optical@yahoo.com
Of course we aree pleased to sample the products, I supply the sample you pay the transport.
We do that because so many time when you call somebody that got a sample for free.........they never even tried it in 3 month.
Hi,
I do edging everyday and sometimes it comes across with some sort of spoke-like scratches at the hard coat layer. The lens manufacturer said it was due to the heat transmitted to the center of the lenses during edging and it led to the detachment of the hard coat layer finally. It happens to some particular brands, (and it never happens on Crizal Alize coated lenses). Even the lenses was edged with no problem at first, the hard- coating scratches come after half year. Poor quality of the lenses?
If this happens primarily in high minus prescriptions with thin centers, the clamping or "chucking" pressure of the edger may be causing the lenses to flex at the center and crazing the antireflection coating. You can minimize this issue by reducing chucking pressure, using a larger block/pad, etcetera.
Darryl J. Meister, ABOM
Hello Websta,
I know that essilor in its Crizal Alizee use a special temporary coating to avoid problem during the edging phase.
My Opinion is that this coating could be a very thin layer of Magnesium Fluoride MgF2 ( search it to Cerac inorganics USA , Phone 001-414-289-9800 Fax 001-414-289-9805)
bye
Mauro Ventura
That would imply that the MgF is applied over the hydrophobic coating. This seems pretty unlikely though if the hydrophobic coating is applied in the vacuum chamber it is possible. Low temperature processed MgF is water soluable so it would wash away after/during edging but would probably survive for a while under the block.
Hello Coda.
Yes, you're right! I mean a very thin MGF layer applied at Cold temperature over the hydrophobic layer; at the end of the AR process.
I don't know any other kind of material that keep to increase temporary the surface energy of lens so that optician people can work lens.
[hYE DEAR MAURO VENTURA?
It is funny to contact you there. Well if you have problem also with the hydrophobic lenses, you know CMV Optique in France of course.... I can help.
Kindly
Christine
QUOTE=mauroventura]Hello Websta,
I know that essilor in its Crizal Alizee use a special temporary coating to avoid problem during the edging phase.
My Opinion is that this coating could be a very thin layer of Magnesium Fluoride MgF2 ( search it to Cerac inorganics USA , Phone 001-414-289-9800 Fax 001-414-289-9805)
bye
Mauro Ventura[/QUOTE]
Hello Mauroventura,
I was wondering about the MgF2 coating that Essilore applies. Do you think thay have a Patent on this. I was told by someone.
Regards,
Sujeet
You can allways search the US patent office site for issued US patents. Go to: www.uspto.gov.
I wouldn't be surprised if there's a similar site for European patents, I just don't know what it is. Seems like the sort of thing Chris would know.
-Matt
I wouldn't be surprised .....................
No idea on that........................but have not searched either.
I still say that opticians should buy regular AR coatedf lenses,............cut the lenses to fit the frame and then apply the slick coat themselves. I can be done very easily in house.
You have eliminated the slipping problem.....saved on messed up lenses and applied a slick coat that is dust and oil repellent with anti fog properties at the same time which none of the Alize and others can provide.
There is also another solution to slippage..................
There is also another solution to slippage.
1) get the lenses without the slick coat
2) cut lenses
3) apply slick coat after cutting in simple in house application
No more off axis lenses..............plus a slick coat that has besides all other goodies even an anti-fog property.
:cheers:
How is this applied? Is it a wipe on? An ampule system with a small chamber? What's the contact angle of this product? How does it compare to alize and other super hydrophics/oleophobics? What's the ease of cleaning rating and surface tension rating? How would it ahere over the top of another hydrophobic that already is on the lens from the AR coating company. How does it hold up in longevity testing with exposure to UV and humidity? I would be very interested if it is comparable to a PVD application.
Quote
I was wondering about the MgF2 coating that Essilore applies. Do you think thay have a Patent on this
Yes they do. Its pretty locksolid on using an oxide evaporant for the purpose of edging lenses.
Last edited by Ace; 07-22-2006 at 01:55 AM.
I would guess that as long as nobody is selling a process, the lab can do whatever they want.
Or advertising or marketing. A dangerous proposition, because everyone wants to tell their customer why their product works.
ii HAVE A GOOD SOLUTION FOR BLOCKING THE HYDROPHOBIC LENSES : WE HAVE NOW SPECIAL BLOCKING PADS ADAPTED AND LENSES DOESN'T SLIDE
Actually on promotion please fax at CMV 33 04 79 63 02 71 for details
Christine FROMONT:)
QUOTE=Websta]Is there anyone who is able to provide me with any information on how we could apply a anti-slip coating over our super hydrophobic coated lenses?
We have tried numerous blocking pads, and the best is from Essilor and Weco, but we need something more substantial as our loss on wasted lenses is getting out of control.
If someone can give me a supplier who provides a coating or a special pad that we can use, I would be very interested.
Thanks[/QUOTE]
WE ARE MANUFACTURING PAD PRINTING MACHINES FOR MARKING THE PROGRESSIVE LENSES AT VERY VERY COMPETITIVE PRICE. FOR MORE DETAILS CMV@CMV.NET IN FRANCE
We are also manufacturing pads special adapted for super hydrophobic lenses and lenses doesn't slide cmv@cmv.net:)
:)
lets keep the adverts in the right forum
We use generic lens protectors without problems. But, you should really look at whether your edger wheel or blade is SHARP. Dull cutting leads to increased friction and heat under the pad as the lens turns on the wheel resulting in rotation and A/R crazing. With sharp cutting surfaces, I don't think you need any non-slip coatings or protectors at all.
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