Horizontal lines

[msenjur]

Hello

sometimes im getting these horizontal lines in print. I did a photo, but it doesnt cleary show them.

I can see that ink is layed differently every second line...

It happens occasionaly... i did strong cleaning, i maually clean head yesterday. turn up heaters...

Probably when i will start new print these lines will be gone... as usually.

Im just wondering why they show up???

 

[vmishev]

Please send picture of your problem.

 

[randya]

Sounds like chromatic banding.
Ink is layed down in different order during each pass of Bi-directional printing.
I.e. from right to left it may be KCMY
But from left to right it will be YMCK.

Printing Uni-directional will solve this issue.
Raising or lower the heater settings can help as well, usually lowering the temps.

 

[msenjur]

Vmishev: i would send a photo, but i dont have enaugh good camera! I took some photos... will post it...

Randya:
Yeah, uniderctional prints so slow, and i had a job, that was in hurry.... Temperature - it was set to 30 celzium... i think i cant get much lower...

 

[dj_elite]

I have the same issues on certain colors. Seems to be mostly dark blues and greens. I havent sorted it out. Seems to happen randomly

 

[randya]

Hard to tell, but it looks like chromatic.
Sometime (depending on media, environment) higher temperatures can help.

Also important that Bi-direction alignments are good.

 

[msenjur]

ok, im going throug google with this chromatic banding... I noticed, that this is pretty comonn problem with printers. Everybody are suggesting uni-directional printing as solution. ok... if you have time, its no problem... but if you are in hurry like me, than that could be a problem... but ok... lets say that is only solution i've got...

I would like to know why some prints that i did doesnt have these bandings? It was same file, same profile, same vinyl, same temperature,...

 

[randya]

I would like to know why some prints that i did doesnt have these bandings? It was same file, same profile, same vinyl, same temperature,...

Environmental conditions?

 

[msenjur]

i soved it by changing dithering.... i chose noice screen...