screen printing > Separations
Choosing LPI For Output
Evo:
--- Quote from: alan802 on May 11, 2011, 06:11:00 PM ---I think I'm going to have to read that a few more times.
--- End quote ---
I know, right?
DING....school's in.
blue moon:
--- Quote from: alan802 on May 11, 2011, 06:11:00 PM ---I think I'm going to have to read that a few more times.
--- End quote ---
I have and am still trying to wrap my head around it . . .
pierre
squeegee:
Mark,
I'm wondering something about the thread diameter and if those percentage limits could be be pushed. When we do simulated process, we work with 55 lpi output with 300/34 mesh, and I am happy to stay at 55lpi as customers are happy, so I'm happy. Considering your statement that on a 55lpi output that a 4% dot is the smallest consistently printable size on 34 micron thread, what do you think of using a 330/30 S mesh in terms of printabilty of smaller percentages? It appears to me from Murakami's mesh chart that a 300/34 and a 330/30 should behave similarly in terms of ink depost.
Pierre (bluemoon) mentioned this somewhere else and I've been intrigued by the idea ever since but haven't tried it yet. If it is the case that 330/30 might allow a printable dot a couple percentage points lower (or higher) how much differnce could it make visably on a print?
I'd love to hear Pierre's take on this as well.
TIA
Dottonedan:
I work closely with Pierre and know he's getting a better halftone because of the new mesh. His coverage is better and at the same time he's able to hold at least an additional 1% lower. We seem to get a good consistent 3% dot out of a 55 line screen.
I have what I think is another interesting topic that is somewhat related to this post. I would not want to begin to stir this one in another direction so I will create another post.
drdot:
--- Quote from: squeegee on May 11, 2011, 10:42:25 PM ---I'm wondering something about the thread diameter and if those percentage limits could be be pushed. When we do simulated process, we work with 55 lpi output with 300/34 mesh, and I am happy to stay at 55lpi as customers are happy, so I'm happy. Considering your statement that on a 55lpi output that a 4% dot is the smallest consistently printable size on 34 micron thread, what do you think of using a 330/30 S mesh in terms of printabilty of smaller percentages? It appears to me from Murakami's mesh chart that a 300/34 and a 330/30 should behave similarly in terms of ink depost.
--- End quote ---
It is possible to pick up that extra 1% by dropping to a 30 micron thread. It gets more complicated, but it is doable. I need to put up several more posts about the relationship of actual thread count to dot area. It gets pretty deep, but it will explain a lot of the behavior that takes place in the very low percentage areas.
There are so many related behaviors, it's hard to make a general post like this and get the full picture of what's actually going on.
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