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trxt (Aerospace) (OP)
10 Sep 09 16:42

Hello Everyone,

I m looking for a kind of PET film or alternative material which is highly transparent but has nonreflective characteristic for clamshell/blister packaging. Blister package is shining under the spotlight of the shelf and the product inside the package can not seem properly. PET is my priority due to costs but i am open to every proposals.

Thank you for your helps..

Demon3 (Materials)
11 Sep 09 17:25
Your only chance is to put a texture on the surface of the blister film. Gloss comes from having a smooth, flat surface. If you can mold in a micro texture then you can reduce gloss but stay with the transparent PET. The material is not the problem, it's the surface. You'd have the same gloss problem with any plastic.

Chris DeArmitt
Consulting to the plastics industry

trxt (Aerospace) (OP)
12 Sep 09 16:18
Hello Chris,

Thank you for your response. I agree with you. Gloss comes from the surface which is smooth like glass.

but if we make microtexture on mold , Probably trancparency will also be reduced. Right?

I will make microtexture on thermoform mold and i will evaluate the result.  
Demon3 (Materials)
13 Sep 09 14:39
Yes, the texture will reduce transparency somewhat.

Chris DeArmitt
Consulting to the plastics industry

suselinux (Industrial)
3 Oct 09 0:57
I've worked with no glare Acrylic before, it's made for signage, its clear to see through but one surface has something similar to a very, very light sand blasting.  You could also try very weak chemical etching.
trxt (Aerospace) (OP)
3 Oct 09 17:14
Hello suselinux,

Thank you for your message. How about the transparency loss?

Transparency is very important for my product. It must be like glass.

I am curious about the acrylic sheet you suggested. Is there a web site refer to this pmma sheets?  
patprimmer (Publican)
3 Oct 09 21:42
Any attempt to reduce glare must disrupt reflection from the surface. This means reducing the smoothness. This scatters light. This reduces transmission and clarity to some extent.

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trxt (Aerospace) (OP)
14 Oct 09 3:19

there are some pvd optical anti-reflection coatings doesnt disrupt the transparency.

they apply on eyeglass and good results can be achieved.

But , i would rather to solve this through plastic operation.  
patprimmer (Publican)
14 Oct 09 6:47
I think you will find there is some compromise with anti glare vs sharpness and transmission even with eyeglasses and camera lenses, well at least there should be according to Isaac Newton.

See FAQ731-376: Forum Policies for tips on use of eng-tips by professional engineers &
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MacGyverS2000 (Electrical)
14 Oct 09 8:03
You can't get past basic physics (at least not without the budget of the Hadron Collider)... if you get rid of reflections, you're getting rid of transparency.

Dan - Owner

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