Author Topic: A really basic tip, especially for Newbies handling screens for coating  (Read 5519 times)

Offline Frog

  • Administrator
  • Ludicrous Speed Member
  • *****
  • Posts: 13980
  • Docendo discimus
After de-greasing, (or your last step with a combo cleaner) be really careful with your fingers. The small amount of body oil that transfers can affect that spot and resist emulsion when coating.

One of those things so basic and simple, it can get overlooked.
That rug really tied the room together, did it not?


Offline bimmridder

  • Gonzo Member
  • ******
  • Posts: 1886
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #1 on: January 04, 2012, 03:25:16 PM »
Don't sneeze on them either!
Barth Gimble

Printing  (not well) for 35 years. Strong in licensed sports apparel. Plastisol printer. Located in Cedar Rapids, IA

Offline ebscreen

  • !!!
  • Gonzo Member
  • ******
  • Posts: 4281
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #2 on: January 04, 2012, 03:26:19 PM »
One view of an obvious greasy fingerprint in the emulsion coating usually teaches that lesson!
Doh!

Offline Prosperi-Tees

  • !!!
  • Gonzo Member
  • ******
  • Posts: 4297
  • Common Sense - Get Some
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #3 on: January 04, 2012, 03:29:34 PM »
What is the best way to dry them afterwards if you dont have a drying cabinet?

Offline inkman996

  • !!!
  • Gonzo Member
  • ******
  • Posts: 3760
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #4 on: January 04, 2012, 03:48:08 PM »
What is the best way to dry them afterwards if you dont have a drying cabinet?

We stand ours up but fanned out to allow air to pass through them. To add on to what Frog just said, after your final step never grab the screen from the top if still wet and your hands are dirty it will run down the mesh.
"No man is an island"

Offline ebscreen

  • !!!
  • Gonzo Member
  • ******
  • Posts: 4281
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #5 on: January 04, 2012, 03:49:07 PM »
Build a drying cabinet.

Not an area to skimp on. A drying cabinet can be as simple as a cardboard box, maybe with a filtered fan,
but better yet, a closet with a dehumidifier. There's so many variables in our beloved process and this is an easy
area to remove at least a few.


Offline tancehughes

  • !!!
  • Hero Member
  • *****
  • Posts: 555
  • Always learning new things!

Offline RICK STEFANICK

  • Gonzo Member
  • ******
  • Posts: 1925
  • INDUSTRY CONSULTANT-OPERATIONS SPECIALIST
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #7 on: January 06, 2012, 12:59:17 PM »
ok. buts also very important to dry coated screens with horizontal with the mesh side down. if you dont have a drying cabinet but have a wall. go buy some 2x2's and nail them to the wall with the gap of your frame diameter between them. then after degreasing or coating you can slide them in and dry flat..doing this you will get much better, consistant results in stencil thickness and exposure times..
Specializing in shop assessment's, flow and efficiency

Offline Prosperi-Tees

  • !!!
  • Gonzo Member
  • ******
  • Posts: 4297
  • Common Sense - Get Some
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #8 on: January 06, 2012, 01:01:12 PM »
I meant drying them after degreasing. I have 2 screen racks that I store my coated screens on.

Offline Ripcord

  • Sr. Member
  • ****
  • Posts: 283
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #9 on: January 06, 2012, 02:05:57 PM »
ok. buts also very important to dry coated screens with horizontal with the mesh side down. if you dont have a drying cabinet but have a wall. go buy some 2x2's and nail them to the wall with the gap of your frame diameter between them. then after degreasing or coating you can slide them in and dry flat..doing this you will get much better, consistant results in stencil thickness and exposure times..
This can be dependent upon the climate. I dried my screens horizontally for years until once when I had to really get one done in a hurry ...I tried it vertical with a fan (it was just a one color spot job) and it dried in about ten minutes (I live in Colorado where our air is very dry). Since then I dry all my screens vertically and have noticed no difference in the quality.

If you live in a humid climate, the emulsion takes much longer to dry, and leaving them vertical can result in the emulsion being thicker on one end of the screen than the other, due to gravity...
Raster to vector conversion

Offline Frog

  • Administrator
  • Ludicrous Speed Member
  • *****
  • Posts: 13980
  • Docendo discimus
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #10 on: January 06, 2012, 02:19:24 PM »
ok. buts also very important to dry coated screens with horizontal with the mesh side down. if you dont have a drying cabinet but have a wall. go buy some 2x2's and nail them to the wall with the gap of your frame diameter between them. then after degreasing or coating you can slide them in and dry flat..doing this you will get much better, consistant results in stencil thickness and exposure times..
This can be dependent upon the climate. I dried my screens horizontally for years until once when I had to really get one done in a hurry ...I tried it vertical with a fan (it was just a one color spot job) and it dried in about ten minutes (I live in Colorado where our air is very dry). Since then I dry all my screens vertically and have noticed no difference in the quality.

If you live in a humid climate, the emulsion takes much longer to dry, and leaving them vertical can result in the emulsion being thicker on one end of the screen than the other, due to gravity...

A dozen screens stacked horizontaly with spacer blocks between them (or a set-up like Rick described) take about the same room as one vertically, and will dry in similar time with a fan, and ensure that one's emulsion produces an EOM evenly over the face of the screen.
Shortcuts with seemingly acceptable results can come back to bite one on the behind. (but you know that  ;D)

It would be interesting to actually measure the EOM on your vertically dried screens as opposed to those dried using the prescribed industry standard method.
That rug really tied the room together, did it not?

Offline chubsetc

  • Full Member
  • ***
  • Posts: 228
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #11 on: January 06, 2012, 02:41:15 PM »
After de-greasing, (or your last step with a combo cleaner) be really careful with your fingers. The small amount of body oil that transfers can affect that spot and resist emulsion when coating.

One of those things so basic and simple, it can get overlooked.

Anyone else here degrease with their hands?  I have always put the degreaser on the screens and lathered the screen with my hands, one on each side of the screen with no issues.  Been doing it that way for over 10 years.  I just assumed that the degreaser degreased my hands and the screens at the same time.

Offline Frog

  • Administrator
  • Ludicrous Speed Member
  • *****
  • Posts: 13980
  • Docendo discimus
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #12 on: January 06, 2012, 03:57:08 PM »
Unless you are using Dawn (and even that may be at higher than intended concentrations) I would think that degreaser may be removing essential body oils and moisture from your hands with that method.
Lotion anyone?

I use a brush dedicated to the purpose.
That rug really tied the room together, did it not?

Offline ebscreen

  • !!!
  • Gonzo Member
  • ******
  • Posts: 4281
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #13 on: January 06, 2012, 05:35:33 PM »

It would be interesting to actually measure the EOM on your vertically dried screens as opposed to those dried using the prescribed industry standard method.

Unfortunately I think most EOM measuring devices only measure that, emulsion over mesh, with little regard as to
which side of the mesh the emulsion is on.


Offline ScreenFoo

  • Gonzo Member
  • ******
  • Posts: 1296
  • Semper Fidelis Tyrannosaurus
Re: A really basic tip, especially for Newbies handling screens for coating
« Reply #14 on: January 06, 2012, 06:39:15 PM »
LOL@bimmridder.  I need a sneeze guard a la Family Guy in my screen room...  "Take it outside, lady"

It'd be interesting to measure thickness on each end of the screen--see how much thinner the top is, even if you can't tell what side it's on.