overmolding glass
overmolding glass
(OP)
I have a sensor which is a small delrin cylinder, to the end of which a small lens is adhered. I am contemplating an insert mold where we incorporate the lens into the body. The reason is to guarantee that the lens stays there over the lifetime of the product. We are currently using a custom epoxy and special processing techniques.
I will need a resin like delrin that is resistant to fluids - water, solvents etc.
Any suggestions?
I will need a resin like delrin that is resistant to fluids - water, solvents etc.
Any suggestions?





RE: overmolding glass
You could mold a Delrin part with fingers or some other detail to locate and retain the lens while the epoxy cures.
Mike Halloran
Pembroke Pines, FL, USA
RE: overmolding glass
RE: overmolding glass
If the time is lost in assembling/ aligning/ centering the lens, that's a different problem.
Mike Halloran
Pembroke Pines, FL, USA
RE: overmolding glass
The only elastomer that is capable of making s good seal when used with glass in a situation AS posted are some of the Silicones.
I would contact someone like Nusil or Dow with your problem.
RE: overmolding glass
Returning to the question: overmolding of glass. Silicones dissolve in some solvents. Delrin, with a similar molecular outer shell to Teflon, does not like to share electron sites with other materials - ie its slippery and has other properties. Delrin is a bit higher temp during injection, was hoping to find an alernative or better material as well as methodology.
RE: overmolding glass
I think if you look around you can find an Epoxy that is UV curable. It may not be exactly the same base as the one you are mow using but it will be close. If you have the usage, people like MasteBond or any manufacturer of adhesives can put you on top on the correct formula.
May I ask what precludes the use of other based adhesives?
RE: overmolding glass
But this is not the question the question was overmolding glass. I give up - I'll just go do it and see what happens.
RE: overmolding glass
Would it be possible to treat the edges of the glass. I know this is an extra step but could speed up things overall.
Could you possibly use a ceramic cement?
http://www.sauereisen.com/adhesives/lamps.aspx
RE: overmolding glass
RE: overmolding glass
Higher temp cures (and over molding) introduce issues with differing CTE between glass and plastic.
RE: overmolding glass
RE: overmolding glass
Tow sites that have information on glass soldering.
http:/
http://www.aimspecialty.com/index.html
RE: overmolding glass
RE: overmolding glass
Harold
SW2010 SP1.0 OPW2010 SP1.0 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: overmolding glass
I guess, in the end, we have evolved the answer anyway. There are probably other ways, but reading this string of responses I think leads you to where are now, (+ or -).
thanks everyone for your time and good thoughts.
RE: overmolding glass
ht
RE: overmolding glass
http://www.apollooptical.com/
Harold
SW2010 SP1.0 OPW2010 SP1.0 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: overmolding glass
and extend the main body so that the lens seats in a counterbore,
then apply the adhesive at the bottom of the c'bore, and press the lens in.
The disadvantage is that it mechanically centers the lens on the o.d., the axis of which is not always coincident with the optical axis of the lens. If you've been centering the lens optically by manipulation, or mechanically by using the sagitta of the lens and the bore of the retaining ring, it would be a step or two backward.
Mike Halloran
Pembroke Pines, FL, USA
RE: overmolding glass
doug
RE: overmolding glass