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From: D Yuniskis on 16 Jun 2010 19:28
Hi Hans-Bernard,

Hans-Bernhard Br�ker wrote:
> D Yuniskis wrote:
>
>> Can these sorts of plastics be buffed to clean them up?
>
> A very common approach, particularly with small displays and
> touch-screens, is to go at this from the other end. Instead of
> scratching it first, then worrying about how to get the scratches back
> out again, people put adhesive protective foils on the display right
> away, which they can replace when they're worn out.

Yes, I was acknowledging this in my caveat "(neglecting
touch sensitive devices)". The films sacrifice some
display clarity and aren't suitable for all applications.

I'm not as concerned with touch/stylus use on a display
as you *expect* wear, there. Rather, I'm thinking of
the sorts of "micro-scratches" that you get on a "clear
window" from slipping something into and out of your pocket,
etc. Not "deep scratches" like you would encounter from
trauma/abuse but, instead, the slow blurring/abrading
that occurs over time (which is usually harder to ignore
than a single *deep* scratch would be)

>> Aside from glass, are there any other clear materials
>> that are suitable for this role?
>
> Even glass isn't really suitable for this in the long run. People who
> care about wrist watches have known that since about forever. Let's

Yes, but you *can* replace the "crystal" on a watch. (well, the
last time I wore a watch, this was true... no idea what watches
are like nowadays :< )

OTOH, it doesn't seem like the "display protector" (clumsy phrase)
on a modern device is designed to be replaced or serviced in
any way. Indeed, I suspect most are expected to be treated in
much the same way as the device in general -- discarded after
a short service life.

So, how do you address this issue when you have something
"precious" that you don't want to be discarding (e.g.,
if your cell phone required you to shell out $2,000 to
replace the phone, you'd probably hang onto it for a bit
longer than 6-18 months :> You'd probably also be very
annoyed if the screen became difficult to read because of
these little scuffs each time it dragged against your clothing,
contents of purse, etc.)

> face it: if you actually use the thing on a regular basis its surface
> _will_ scratch, eventually. It may take a grain of sand getting stuck
> in just the wrong place, or a person with a diamond ring on their finger
> making a klutzy move in just the wrong moment, but it will happen.
From: George Neuner on 16 Jun 2010 19:48
On Wed, 16 Jun 2010 13:12:04 -0700, D Yuniskis
<not.going.to.be(a)seen.com> wrote:

>Hi,
>
>Probably more of a materials engineering question...
>
>Most devices (esp. handheld) with displays tend to use
>polycarbonate, etc. to protect the display (neglecting
>touch sensitive devices).
>
>Over time, this scratches.
>
>The packaging often precludes replacing "just" the "display
>protection". So, the product's useful life is reduced because
>a piece of plastic wasn't, in essence, "hard enough".
>
>Can these sorts of plastics be buffed to clean them up?
>Aside from glass, are there any other clear materials
>that are suitable for this role?
>
>Thx,
>--don

Take a look at BodyGuardz.

http://www.bodyguardz.com/content/customercare/page-what_is_bodyguardz.htm

George
From: Jon Kirwan on 16 Jun 2010 22:14
On Wed, 16 Jun 2010 13:12:04 -0700, D Yuniskis
<not.going.to.be(a)seen.com> wrote:

><snip>
>Can these sorts of plastics be buffed to clean them up?
><snip>

I've used Novus _Heavy_ (#3) and _Fine_ (#2) Scratch Remover
-- buyable in 64 fl oz sizes. (Novus, Inc., Minneapolis, MN,
55438... I have 800 548 6872 written down on the bottle of
one of these, which is either Novus' phone or else a
distributor I bought from.)

Jon
From: kelly on 17 Jun 2010 00:57

"George Neuner" <gneuner2(a)comcast.net> wrote in message
news:9loi16lita4v546b9tf3e2fsdc22pb21pk(a)4ax.com...
> On Wed, 16 Jun 2010 13:12:04 -0700, D Yuniskis
> <not.going.to.be(a)seen.com> wrote:
>
>>Hi,
>>
>>Probably more of a materials engineering question...
>>
>>Most devices (esp. handheld) with displays tend to use
>>polycarbonate, etc. to protect the display (neglecting
>>touch sensitive devices).
>>
>>Over time, this scratches.
>>
>>The packaging often precludes replacing "just" the "display
>>protection". So, the product's useful life is reduced because
>>a piece of plastic wasn't, in essence, "hard enough".
>>
>>Can these sorts of plastics be buffed to clean them up?
>>Aside from glass, are there any other clear materials
>>that are suitable for this role?
>>
>>Thx,
>>--don
>
> Take a look at BodyGuardz.
>
> http://www.bodyguardz.com/content/customercare/page-what_is_bodyguardz.htm
>
> George


Apple & others sell similar precut film to protect iPod displays. They are
not adhesive backed and are held in place by "electrostatic" force (?). Cost
is a couple of dollars retail.


From: Stef on 17 Jun 2010 04:11
In comp.arch.embedded,
D Yuniskis <not.going.to.be(a)seen.com> wrote:
> Hi,
>
> Probably more of a materials engineering question...
>
> Most devices (esp. handheld) with displays tend to use
> polycarbonate, etc. to protect the display (neglecting
> touch sensitive devices).
>
> Over time, this scratches.
>
> The packaging often precludes replacing "just" the "display
> protection". So, the product's useful life is reduced because
> a piece of plastic wasn't, in essence, "hard enough".
>
> Can these sorts of plastics be buffed to clean them up?
> Aside from glass, are there any other clear materials
> that are suitable for this role?

A car polish will remove very fine scratches and there are also
special plastics polishes I believe. But these will only remove
very minute scratches.

Any deeper scratches should first be removed with sandpaper.
Depending on the depth of the scratch, start with grit 2000,
1000 or 600 (or even courser for very deep scratches) and work
back up to 2000. Then polish the now milky white surface.

If you have to remove a lot of material, it's best to do that
evenly on the whole surface, otherwise you might end op with
visible dents after polishing. Use a sanding block to maintain
a flat surface.

There are also 'polishing papers' up to grit 10000 or even
higher. I have no experience with them but maybe they can be
used instead of the (car) polish.

And please try the operation on a scrap piece of plastic before
attempting to fix expensive equipment. ;-)

--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)

Let the worthy citizens of Chicago get their liquor the best way
they can. I'm sick of the job. It's a thankless one and full of grief.
-- Al Capone
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