Material that won't scratch/leave residue on glass
Material that won't scratch/leave residue on glass
(OP)
Hi,
I'm researching material that will be not leave marks/scratches or residue when pressed against the glass with, say 5 lbf. I can think of plastics and polymers but not sure of which ones.
From this material, I'm going to make pins that will be spring loaded. The window glass will touch and press the pins with, say 5 lbf.
Thanks
I'm researching material that will be not leave marks/scratches or residue when pressed against the glass with, say 5 lbf. I can think of plastics and polymers but not sure of which ones.
From this material, I'm going to make pins that will be spring loaded. The window glass will touch and press the pins with, say 5 lbf.
Thanks





RE: Material that won't scratch/leave residue on glass
Dik
RE: Material that won't scratch/leave residue on glass
the same.
RE: Material that won't scratch/leave residue on glass
Dik
RE: Material that won't scratch/leave residue on glass
RE: Material that won't scratch/leave residue on glass
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Material that won't scratch/leave residue on glass
Dik
RE: Material that won't scratch/leave residue on glass
When I was involved with this material their technical and sales force were always very helpful.
http://www.santoprene.com/home.html
RE: Material that won't scratch/leave residue on glass
RE: Material that won't scratch/leave residue on glass
TTFN
RE: Material that won't scratch/leave residue on glass
IRstuff
It's 200-300 times/day and 2-5 second per cycle.
RE: Material that won't scratch/leave residue on glass
How big is this pad? How does the system ensure that the pad hits the glass squarely? Any angular displacement will also cause the pad material to move against the glass.
What's the criticality of the non-abrasion? Perhaps the glass portion should be made replaceable.
As a further example, albeit somewhat poor, most copy machine glasstops get abraded where the roller wheels touch the paper during the copying process. It's the restarting of the paper motion after the copying that does it, since there's no longer the air film to buffer the paper from the glass.
TTFN
RE: Material that won't scratch/leave residue on glass
Basically, I have a fixture that locate and press a glass window to a tape. The tape is adhesive backed and will be located using slot and a hole on a vacuumed plate that has 2 spring loaded locating pins. These pins will be riding on bushing or linear bearings. Since the window need to be pressed to the tape and the the locating features are inside the tape geometry, I'm planning to use either plastic or hard rubber pad mounted on the spring loaded locating pins so that the window will not scratch and more importantly leave no marking. Right now, either I use FDA grade polyurethane or PTFE. The window is 6" square and the pad will be 3/8".
Non-marking is the critical issue here.
The pressing actuation can be either manual or pneumatic driven.
RE: Material that won't scratch/leave residue on glass
Since your pin is spring-loaded, the pad doesn't need to be. I'd be concerned that the urethane might acquire a "set." Likewise, certain PTFE's will flow under pressure.
Have you considered some sort of nylon-derivative like Delrin?
TTFN
RE: Material that won't scratch/leave residue on glass
Thanks
RE: Material that won't scratch/leave residue on glass
TTFN