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why is glue comming through 20mm onto White Capping?
Hi all
Need some help with the following – apologies if my terminology is not correct.
We are producing illuminated Pan panel signs that are for external signage positions. The make up of the face of the sign is as follows –
Clear 5mm panel that is adhered to the inside of the panel covering the logo aperture.
Sitting on top of the clear I have 20mm clear flame polished cut set letter / logo which protrudes through the face aperture with a 1mm key line surrounding. The 20mm is capped off with a 5mm color perspex to face, this is all fine and dandy until we face with white. The problem with White is the glue marks from the 20mm to the clear back panel are illuminated through the white capping and show for all and sundry to see. The capping is there to knock out the light and allows a glow off light surrounding the logo / letters.
I have contacted two of my suppliers and they have given me there most dense white but still we are seeing the glue, we have capped with aluminum but this takes the capping away from my router and also needs to be powder coated so not the best option for the business.
Is there a White stock that will not allow light through I will go to 10mm if I have to but would rather not. Or perhaps a magical glue?
Please help if you can
Cheers
Liam McCullough
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5 Replies
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Why not paint or vinyl coat the rear of the white with something that acts as a light barrier?
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Hi Graeme
Sounds like your onto something Graeme, I normally apply with chloroform glue between the capping and the 20mm, I would imagine that I would need to use a different type of glue to the Chloroform mix as I would imagine there would be a reaction to paint and the glue would certainly melt into the vinyl.
Thanks for taking the time to help out.
Cheers
Liam
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If you do not want to interfere with the bond properties between the capping and the surface sheet, then have a look 1 layer further down and manufacture your light barrier there.
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Hi Graeme
If I go one layer below then this will stop all light travelling through the 20mm clear and I will loose the haze effect.
Liam
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Liam, have you tried using a different adhesive? I did some panels for an exhibition a few years ago where I had to bond coloured glass samples to an acrylic panel and to prevent any discolouration of the glass had to use an optically clear adhesive. Sorry can’t remember where I got it but I am sure it was from one of the main suppliers like Europoint or Amari Plastics.
Did a very good job but I don’t think it was that cheap.
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