screen printing > Tips and Tricks to Share (Please don't ask questions here)

Blocking pin dots ect on WB/DC screns

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Orion:

--- Quote from: SI on August 14, 2016, 02:48:37 PM ---... Once we switched emulsion it is almost impossible to get any type of tape to stick to the bottom on wb/DC job....

--- End quote ---

Have you tried using blue painters tape?

SI:
We have tried just about every type of tape you can imagine.  Unfortunately the local UPS won't hand out the labels like they do for Alex.  I haven't tried sourcing them elsewhere to see if  it would work or not.  We were running +5 minute exposures with SP-1400 on the 3140, then back in June we got the Ryonet FX (saati LED)  this cut the exposure times down to 2:30, but switching to PHU or cryocoat gets us down to 10 second exposures.  Also the old 3140 had some beat up glass and we got a lot of pinholes from that.  But with the new exposure and emulsion we rarely get a pinhole.  However as I mentioned no matter what tape i have tried it falls off after about 50 shirts on a HSA, WB/DC job.  So I just don't add reg marks to these jobs, I normally print the UB film with reg marks and just draw a thin line on the squeegee side of the mesh with a sharpie, then cutoff the reg marks before burning the screen.  It takes a little longer to line up the job on press but its better than tape falling off on a DC job and ruining a shirt.  I hope to be purchasing a CTS before the end of the year and at that point it won't matter anymore. 90% of what we do is corporate contract work which is almost exclusively plastisol.

   If I were to pick up a lot more WB work, of get a big order I have SP-1400 still and would mix it for that job.  I have not ran the PHU or cryocoat for more than 600 pieces yet and I'm just not sure how much I would trust it.  When we hit the end of the 600 piece job it was looking suspect and practically fell off the mesh when we washed the screens out

ericheartsu:
it sounds like you aren't exposing your PHU enough.

SI:
Hard 7 on the Stauffer strip

jsheridan:

--- Quote from: SI on August 14, 2016, 10:51:18 PM ---Hard 7 on the Stauffer strip

--- End quote ---

let em sit in the sun for a couple hours and see if they still do it.

i've used phu and seem to recall the bottom of the screen being a little sweaty.. not wet but tape didn't stick.

that's ok as you want to tape DC screens from the inside anyway. tape on the back of the screen creates a pressure point and the screen will break down along the edge of the tape.. seen it happen plenty of times. weird occurance but it happens.

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