Hello from South Australia. I used to post on here years ago, but stopped when I stopped printing. Was a textile printer for 5 or so years, but quit when I got sick of working for a-holes that either had no idea about printing, or knew too much and you were never good enough.
Long story short, after a few years hiatus where I've been concentrating on bikes, bands and house renovations, I've pulled all my screenprinting stuff out of storage and have finally set it up. It's inspired me to print a small zine with photos my friends and I have taken as halftone single colour prints. I'm using waterbased ink.
I have managed to remember pretty much everything, and have exposed the screens. The halftone has turned out fine, but I'm having some issues.
1. My screens are breaking down after a couple of washes. This isn't too concerning right now, but I'm not sure it's the emulsion, the exposure time (which is quite long because of my light source), or if I should expose my screens after I've washed the image out. The emulsion is from a friend who runs a printing place, but he mainly uses plastisol. He does use this emulsion for waterbased and solvent as well though.
2. The stock I have been using for test prints has been warping / wrinkling when printed. I plan to print on both sides of the paper as well. I obviously don't want to go too thick, but I've gone up to 120gsm (32lb I think) and it's still wrinkling after being printed. Any suggestions for thickness? I'm considering going up to 200gsm (70lb?) for the pages and 300gsm (110lb?) for the cover. I'm using a 98t screen (240?) and the halftone is 45dpi. Could I be pushing too much ink though. I'm doing a single pull with a flood coat after each pull, and am trying to not pull to heavily.
Thanks for any help and suggestions, and sorry for any conversion problems with the paper and screens, Australia and the US is quite different.