Diffuser/transmissive plastic?

[Patrick Barnes]

I need to make an illuminated sign, I'm thinking from black perspex with cutouts and a lit chamber behind it.

To help support the letters, make the light more even, and seal the sign I want to glue something appropriate behind the front face. (So that light shines through it)

Any suggestions for something that's suitable and readily available, (in the space, or at a nearby store?) and at least 60x25cm?

-Patrick

[andrewl]

Contact adhesive film?

Sent from my Samsung Galaxy smartphone.

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[Patrick Barnes]

> Contact adhesive film?  
Might work applied to a clear layer, depends just *how* diffuse it is.

The features are cut out of the front, somewhat like (but more complicated than) the below pic.

So it needs an extra bit of substrate stuck behind the front piece.

  

[Jeremy Nelson]

I've used polcyarbonate sheets from Bunnings as diffuser for lighting very successfully:

I think it was something like this:

https://www.bunnings.com.au/suntuf-1200-x-600-x-3mm-uv-diffuser-polycarbonate-foam-sheet_p1010811

These were Ikea lamp shades which normally take a bulb but I replaced by cutting a diffuser disc, putting in 240V LED strips around the perimeter all held together by 3D printed clips that clipped on to the upper ring, and also held the LED strips and the diffuser disc. Turned out really well!

Jeremy.

On 26 August 2017 at 21:56, Patrick Barnes <mrt...@gmail.com> wrote:

> Contact adhesive film?  
Might work applied to a clear layer, depends just *how* diffuse it is.

The features are cut out of the front, somewhat like (but more complicated than) the below pic.

So it needs an extra bit of substrate stuck behind the front piece.

  

On Sat, 26 Aug 2017 at 21:42 andrewl <and...@arcadius.com.au> wrote:

Contact adhesive film?

Sent from my Samsung Galaxy smartphone.

-------- Original message --------

From: Patrick Barnes <mrt...@gmail.com>

Date: 26/08/2017 9:22 pm (GMT+10:00)

To: Robots and Dinosaurs <sydney-hackspace@googlegroups.com>

Subject: [RnD] Diffuser/transmissive plastic?

I need to make an illuminated sign, I'm thinking from black perspex with cutouts and a lit chamber behind it.

To help support the letters, make the light more even, and seal the sign I want to glue something appropriate behind the front face. (So that light shines through it)

Any suggestions for something that's suitable and readily available, (in the space, or at a nearby store?) and at least 60x25cm?

-Patrick

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[Patrick Barnes]

Nice result!
Is it like foam-core paper or something?

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[Kris]

James can chime in, but opal perspex is used by sign makers. We have some at the space.
Here's some I used as a make up mirror.
Alternatively, baking paper also works really well.

Kris

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From: Patrick Barnes <mrt...@gmail.com>
Sent: 26 August 2017 23:27:18 GMT+10:00
To: sydney-h...@googlegroups.com
Subject: Re: [RnD] Diffuser/transmissive plastic?

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Sent from my Android device with K-9 Mail. Please excuse my brevity.

[Kris]

With image this time

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From: Kris <kr...@sleepingplanet.com>
Sent: 27 August 2017 08:28:46 GMT+10:00

[devastatorbadman]

That's a lovely mirror Kris.
I always wondered how you got your makeup looking so nice.

 

But yeah Patrick, what Kris said....

from internet:

PERSPEX^® Opal acrylic comes in a wide range of white tones, where a white colour palette is required or more specifically, for light box applications. The range of light transmission through the opal sheet, up to 70%, receives maximum haze and subsequently offers the maximum light diffraction.

also from internet:

Opal Cast Acrylic is a translucent white colour and is traditionally used in illumination and light box creation. Opal Cast Acrylic is available in varying light transmission levels 422, 433 & 445.

It's available from City West Plastics or your local rectangle factory.

James