Bags for RK05 disk cartridges

Swift Griggs swiftgriggs at
Wed May 11 17:50:08 CDT 2016

On Wed, 11 May 2016, Jack Rubin wrote:
> Ideally, I'd like to find Ziploc-style poly bags like the DEC originals 
> with the warning about dirt on the heads (the famous hair/head picture). 

I'm guessing with all the DEC gurus on the list you'll find what you are 
after. However, I can tell you that I've been able to screen print on 
plastic very effectively in the past. I do screen printing mainly for 
shirts and other fabric/clothing items. However, I've also used the 
technique to print on glass etc...

I've used PVC inks to print on silicon and plastic before. However, there 
is a (big) caveat. When you go to cure the ink, you can't wuss-out on the 
high temp bake (your ink will tell you how hot and for how long). This is 
enough that it'd melt most plastic, so you need to use heat resistant 
bags. They are available in lots of different sizes and you can also the 
edge of a vacuum sealer, or a red-hot blade to create your own sizes by 
annealing the edges together. Then you screen print on top of that.

It'd cost you between $100-$200 bucks to get setup with a pre-stretched 
screen, photoresist, a bit of ink, a bright light, and a curing/heat wand. 
So, it's not something I'd recommend just to print the bags. However, once 
you have the gear, you can find a ton of other places to use it should you 
have as many hobbies as I do. You can wash out the photoresist and re-use 
the screen infinitely. You can transfer the design directly to the screen 
simply by printing a transparent negative, overlaying it on the screen 
painted with resist, and exposing it.


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