i need a half inch sheet of cast acrylic but have found 48x96 1/4" sheets for a lot cheaper… can I use Weld-On on the matching faces of the 1/4" sheets? is this even possible on an area that wide to create a new sturdy 1/2" sheet?
what process is used to digitally print on acrylic? the only places i could find on google were in europe.
1.) Yes you can use Weld-on, but you will definitely have some air bubbles. Unless you used a roller laminator and some optically clear adhesive sheet (not sure on a brand here). If you’re going to paint it, it won’t matter.
I have used a place called Dedicated Graphics outside of Chicago if that is more convenient than NURB’s places in Minneapolis.
And although I have never bent laminated acrylic, I can’t imagine that working well. I could see any air bubbles in the solvent getting worse as the plastic is bent. Maybe I’ll try it in the lab tomorrow for funsies.
iab: i’m looking forward to hearing the results from your experiment. is it true that you have to heat up both sides of the sheet the thicker it is? with a standard plastic heater, how would you go about doing this without warping it as you flipped it over?
with a standard plastic heater, how would you go about doing this without warping it as you flipped it over?
Use two heaters; one on either side.
But mw, you didn’t mention what the bend radius is that you are attempting to make … 1/2", 1" … a huge 10" radius? Larger?
Another thing you need to understand about bending “plastic” is that when making a “free bend” (no form to control the flow of material) the “inside” radius will not be parallel to the “outside” radius. This happens because as the material at the outer surface of the bend stretches (flows), the material toward the inner surface compresses; the result is that the material at the middle of the bend radius thinner.
It is not as pronounced on thin thermoplastic material (up to about 3/32"), but it is there. It becomes very pronounced on thicker materials; > 1/8". The larger the radius, the less the stretch (less, not eliminated).
This occurs in sheet metal as well, but is not as pronounced because the metal is less fluid than “plastic”.
If you look closely you can see this in this pic … granted, 180° is an extreme bend.