I'm new around here, and need a bit of advice. First off, a little intro: My name's Mike, I'm a 22-year old recent Graphic Design graduate. Working a lame design job at a sign shop currently, but I am hoping to hook myself up with a studio soon, preferably one that deals a lot with poster design (surprise, eh?).
Anywho, the issue at hand. I have been screenprinting for a couple years now, and have never encountered this one before. I'm working on fully screenprinted promo books to send to studios, and on the cover there's a good bit of pure black. Prior to this I had to lay down a field of white, which went down evenly and cleanly. When I screened the black, though, it seemed as though the paper lifted with the screen a bit in some spots, leaving a kind of weird inconsistency. I was curious what caused this, and what I can do in the future to avoid it?
Below is a quick 'n' dirty scan of one of the more prominent examples of what I'm talking about:
If it helps, I was printing on brown Kraft paper with Speedball Acrylic black. Thanks in advance,