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first time screen printer need help - tshirt is sticking to the ink when I lift up the screen. and the ink isnt coming out evenly

3901 Views 12 Replies 8 Participants Last post by  Akovski
2
Well I got all my supplies and started printing today. This will be a multi purpose thread. I will have many question thru out my process of screen printing im sure.

What I'm using:
Black plastisol Ink
mesh count is 110
squeegee is 70 durometer

Questions:

#1 Im really not sure what im doing wrong. but I sprayed 3 passes over the station where the t shirt lays. It was pretty sticky, enough to hold the tshirt in place. The problem Im having is that the tshirt is sticking to the ink when I lift up the screen. and the ink isnt coming out evenly. some places are really smooth and others are splotchy.

Answered: Pending

#2
Why would I need to thin my ink?? and how would I do so?


Thanks for helping out a beginner! much appreciated!



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first time printer need help

Well I got all my supplies and started printing today. This will be a multi purpose thread. I will have many question thru out my process of screen printing im sure.

What I'm using:
Black plastisol Ink
mesh count is 110
squeegee is 70 durometer

Questions:

#1 Im really not sure what im doing wrong. but I sprayed 3 passes over the station where the t shirt lays. It was pretty sticky, enough to hold the tshirt in place. The problem Im having is that the tshirt is sticking to the ink when I lift up the screen. and the ink isnt coming out evenly. some places are really smooth and others are splotchy.

Answered: No


Thanks for helping out a beginner! much appreciated!



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Your screen should be parallel to your platen. You should have as tight a screen as possible. And there should be a distance between the bottom of your screen and the platen when the screen is down (off contact). You should have a nice smooth, even pressure print stroke that's a bit firm but not hard. The ink should shear from cleanly from the screen and you shouldn't leave a trail of ink across the image behind the squeegee.

What I'm using:
Black plastisol Ink
mesh count is 110
squeegee is 70 durometer


Add:

(The most important element)

A comprehensive video series or a book on screen printing and some time and patience to sit and study until you have a more thorough understanding of the whole process. Do this before picking up a squeegee again and you'll save time and frustration and it'll be more fun.

Youtube videos:

Ryonet, Roger jennings, Catspit Productions, Bill Hood, Scott Fresener/T-Biz Network


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What is your off contact at? It looks like you might need to raise it.
Off contact should be 1/8-1/4. Black is usally the easiest color to print. Mix the ink maybe even warm ink do this by putting ink container in a bucket of warm water then mix and set back several times. I usally just mix black though and warm my white. I also never use 110 mesh for black I always use 156 but it looks to me your ink needs mixed and if ink is cold warmed. Are these new screens if they are used and lost a lot of tension then can also cause the problem.
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As Chris said, it looks like you need to set your off-contact so that when you pull or push the squeegee that the screen comes off as you move the squeegee. For t-shirts, your off contact should be about 1/8th of an inch. Most printers just tape an actually quarter (25 cents) to the top of your frame. Give this a try and it should solve your problem.
as stated above...check off contact....also get a higher mesh count screen...110 is to coarse for black ink....try a 230

Inked
From the looks of the top edge, your big problem is tension--not to say all the above isn't great advice--it is.

You may also need to increase your squeegee angle, sharpen your squeegee, and/or thin the ink slightly, if Sbens mixing/warming advice doesn't help.
:: edited thread TITLE to be more descriptive and moved to a more appropriate section of the forum (and merged duplicate topics :)) ::
:: edited thread TITLE to be more descriptive and moved to a more appropriate section of the forum (and merged duplicate topics :)) ::

already moved. and title will stay the same. i have multi questions im going to be asking. so there is no general description.
Thanks everyone for the help. I will be doing some more tests this evening after I get off work. I already set the offset to 1/4 inch and going to stir my ink approiately.

I work at a sign shop and we screen print street signs, so I am going to have the main screen printer give me some pointers tomorrow, so hopefully with ur advice and his knowledge ill be able to get some shirts done.

Thanks again
I already set the offset to 1/4 inch
I think 1/4 inch is to much off contact for black ink....try to use 2 pennies worth of off contact. set your off contact, then tape 2 pennies to the end of the screen closest to you. at the opposite end of the screen clamp, this will ensure an even off contact from one end of the screen to the other...I think even with a 110 mesh screen you shouldnt be having an issue with the shirt sticking to the screen..there is something else other than off contact going on here.

are you flooding the screen before you print?
what squeegee angle are you printing at?
are you pushing or pulling the squeegee?
does the screen snap at the end of your print stroke?

there are alot of variables that go into screen printing....you need to keep track of everything during the whole process.

Inked
well it worked out for me. I added the pennies yesterday and it worked great. the only problem now is i think im over flooding the screen or putting to much pressure. bc i can see ink on the underside the screen so when i go to do a shirt it is uneven. I had to lay down paper and push down on the screen with my finger and get the excess ink onto the paper. I will post pics next time I print
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