Ellipse Vrs Dot shape benefit "example attached"

[Dottonedan]

All interesting reads. Love it.

Here is an example, as best i recall, 55 lpi-25% tint, heavyweight t-shirt, manual press.

Great picture. Thanks for taking the time to post it. I still don't really think your issue here is garment weave.  Are you sure that you did not already have weaker areas in your films?  I've seen some RIPS provide this effect straight out of the film printer depending on a few things. 1, a weak rip system. Some are worse than others. 2, Rollers need cleaned and can be skipping so to speak. I'm not claiming to be an expert in those areas, but thats what I've seen.

I say that, because really, you should bot be seeing stronger and weaker dots (due to the weave of a garment) at 55 lpi-25% tint. If so, then I would suggest that you have other issues outside of the weave factor. When looking at it, it may make you think it's the weave (by appearance only).

A 55 lpi-25% tint, is actually a pretty robust percentage. I would venture to say that at a 25% tint, you should not even get weave interference at 65 line screen. 5% on a 65 line screen is more like the range for weave interference from what I've experienced. I could be wrong. I'm open to proving me wrong. It's educational.

[squeezee]

I can make them round/ellipse/line, it just takes a little playing with the postscript definitions.

[Dottonedan]

I once tried to create my own postscript halftones using my logo.  I never really took the time to complete it. Would have been cool though.

[yorkie]

I could be wrong. I'm open to proving me wrong. It's educational.

I'm not proving anything to anyone. If you care, look the next time you print a halftone on a heavyweight shirt. Look real close.

Every dot printed on a textile is effected by the knit.

[Dottonedan]

I don't doubt you really. Just never experienced it that way myself.

[Orion]

I prefer the four angle set. It holds better shadow detail and is more forgiving when slightly out of register.

[Dottonedan]

It's interesting how very different our preferences can be. I don't doubt that these other angles work for others. For me and my customers thus far, we don't have any issues with miss aligned angles....that I am aware of. Nobody makes me aware of any issues. I do see the results tho. For example, you can find a CMYK job I separated here on this forum. I think it's in Gallery and posted by Pierre from Blue Moon. It was all done at 22.5 in straight process. The interesting part is that it is riddled with areas of solid consistent colors. These are typical areas where if you are going to see moire or mesh interference.

It's a cartoon in CMYK as well as having an underbase for medium colored garments.

[Orion]

I agree Dan, we all do things differently. I guess it is just what works, or what we have learned over the years, as to how we approach the execution of our jobs. Discussing how we do things differently and what works for us is what I am here for.

[blue moon]

I agree Dan, we all do things differently. I guess it is just what works, or what we have learned over the years, as to how we approach the execution of our jobs. Discussing how we do things differently and what works for us is what I am here for.

YIIEEEPEEE! I keep thinking about it and wandering if I am missing something by sticking to the same angles (sorry Dan!). Have you tried to do the same print with both and compared?

Could it be that one works better for some and the other is better for the rest?

I know Dan is firmly in the 22.5 clan and the other person I respect very much (His royal highness) is hard core rosette supporter. I have been printing 22.5, and thanx to Dan doing rather well, so there is no question that some remarkable prints can be produced by using the same angles, but I should really try the rosette just to see what happens.

pierre

[squeezee]

I will point out that 'everything at 22' is almost unique to the tshirt industry!

[Denis Kolar]

I will point out that 'everything at 22' is almost unique to the tshirt industry!

I work in Flexo printing Co. and we use some weird numbers for our angles. Something like 7 for Cyan, 28 Magenta, 35 Yellow and 51 Black. Any other screened color should not be any of those before mentioned angles.
Do not ask me why those exact numbers.

[Orion]

I respect very much (His royal highness) is hard core rosette supporter.

If you mean Coudray, well yeah he is.

[Dottonedan]

I believe Pierre is referring to "The Duke of York" aka Yorkie to these forums. 

[yorkie]

I work in Flexo printing Co. and we use some weird numbers for our angles. Something like 7 for Cyan, 28 Magenta, 35 Yellow and 51 Black. Any other screened color should not be any of those before mentioned angles.
Do not ask me why those exact numbers.

The reason why, is the anilox roller has a 45 degree angle. An anilox roller is what transfers the ink onto the flexo plate. Because the ink is being transfered at a 45 degree angle, it could moire or strobe with the halftone angles of the dots etched into the flexo plate. Since the anilox was 45, every other angle needed to rotate.

[blue moon]

Orion meet The Duke(ie) of York(ie)!

That last answer is why we missed him so much!

Your Royal Highness,  can you under any circumstances (in your opinion) see where a 22.5 would be a better choice than a rosette?

pierre