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screen printing => Screen Making => Topic started by: Rockers on June 29, 2013, 07:28:40 AM

Title: ChromaBlue and high humidity
Post by: Rockers on June 29, 2013, 07:28:40 AM

is it possible that ChromaBlue and high air humidity are a no go? I hardly can get our screens of the exposure unit as they stick like crazy to the glass. It`s just happening during summer as we have humidity levels of over 70%. They sit the whole day in a room with a dehumidifier switched on but as soon as they hit the exposure unit the fun is over. I`m surely not the only one experiencing  this problem, right?

Title: Re: ChromaBlue and high humidity
Post by: DCSP John on June 29, 2013, 08:29:47 AM

we have the same problem here in Washington, DC.
Humidity is a killer in the screen dept.

Solution? For us we use talcom powder on  transparencies, and a slight dusting
on screens. Works just great. Give it a whirl. You will be pleasantly surprised.

John

Title: Re: ChromaBlue and high humidity
Post by: ScreenPrinter123 on June 29, 2013, 10:48:34 AM

We were suggested to use baby powder and worked like a charm. Just spread a little on the print side right before you tape your film to the screen and expose - helped a lot and didn't notice any pinholes which was my first concern. You may have to clean your glass from time to time to removed any small clumps of baby powder that may group together after a lot of tries. At like $1.00/bottle, worth a try, as it worked for us and at least one other shop when we used chromablue.

Title: ChromaBlue and high humidity
Post by: tancehughes on June 29, 2013, 06:57:28 PM

Same here, except sometimes it still sticks with the baby powder on. Baby powder definitely helps in this Louisiana heat

Title: Re: ChromaBlue and high humidity
Post by: sben763 on June 29, 2013, 07:47:07 PM

Most of the photopolymer emulsion will absorb humidity during high humidity or simply never dry all the way. The is no substitute for a dehumidifier. This can change proper exposure drastically also. The baby powder works but won't help correct proper exposure times.

Title: Re: ChromaBlue and high humidity
Post by: Rockers on June 30, 2013, 03:40:30 AM

We use the ChromaTechPL2 as back up and that works a lot better in there conditions. No sticking to the glass. Even with the dehumidifier working around the clock I find the ChromaBlue impossible to work with under these conditions.

Title: Re: ChromaBlue and high humidity
Post by: Stinkhorn Press on July 26, 2013, 05:03:55 PM

Never thought of baby powder. Thanks

Title: Re: ChromaBlue and high humidity
Post by: tancehughes on July 26, 2013, 05:21:57 PM

Yeah ChromaBlue sucks w/ high humidity, but we use baby powder too. Works good, but there are times where the screen still sticks.....