Author Topic: Emulsion tackiness after exposure (Read 7872 times)

ericheartsu · « **Reply #15 on:** May 06, 2012, 12:12:03 PM »

Quote from: jasonl on May 06, 2012, 11:50:48 AM

I never understood why some shops put their exposure unit in a dark room. I like to see what I am doing. I put mine out in the light with ZERO protection and it works PERFECT!

So do we, but i just didn't know if it was best to put the powder on first then the films, or vice versa? i'm assuming the previous statement is the correct one.

We do however line up our films in our dark room.

jasonl · « **Reply #16 on:** May 06, 2012, 01:14:46 PM »

Only thing I do in the dark room is COAT SCREENS. THATS IT!

Frog · « **Reply #17 on:** May 06, 2012, 01:24:58 PM »

Actually, coating does not demand darkness as when still liguid, the emulsion has extremely reduced photosensitivity. (this is not to say to leave the cover off indefinitely)
Drying and storing the screens is another matter, and larger shops may require a whole room rather than a cabinet.

ScreenFoo · « **Reply #18 on:** May 06, 2012, 01:51:04 PM »

When I was dealing with the stickiness I used something similar to a 'pounce bag'. (I know there are at least a few letterheads on here who know what I'm talking about...

)

Cut a square of T-shirt, throw a handful of talc in it, rubber band it into a little bag--tap it to get some out, nice for spreading it out too.

mooseman · « **Reply #19 on:** May 06, 2012, 03:01:17 PM »

Quote from: jasonl on May 06, 2012, 01:14:46 PM

Only thing I do in the dark room is COAT SCREENS. THATS IT!

we coat like before in open...we do different things in the dark room :

mooseman

mooseman · « **Reply #20 on:** May 06, 2012, 03:03:23 PM »

[quote

jasonl · « **Reply #21 on:** May 06, 2012, 03:06:53 PM »

does anyone attach films to the screen? dont know why you would do that.

mooseman · « **Reply #22 on:** May 06, 2012, 03:07:26 PM »

Quote from: screenxpress on May 06, 2012, 11:46:40 AM

Quote from: mooseman on May 06, 2012, 10:07:51 AM
Quote from: ericheartsu on May 06, 2012, 01:29:20 AM
Where do you baby powder yoru screens? We used to do it, and it made a mess in our dark room.

we have a cabinet where we keep our exposure ready screens. When we select the screen we simply take it from the cabinet hit it with the powder spread it with our hand and place it directly onto the exposure glass.
We do this in open light , yes fully open light with no filters or other precautions.

mooseman

Pssst. Next time put the film on it for better results.

we never attach the films to the screen for placement
actually we have a placement system on our exposure unit so the film is sitting there properly registered to the pallet / screen association just waiting for the powdered screen to hit the glass .

screenxpress · « **Reply #23 on:** May 06, 2012, 08:31:16 PM »

well, damn, thought i had u.

mooseman · « **Reply #24 on:** May 06, 2012, 08:36:06 PM »

Quote from: screenxpress on May 06, 2012, 08:31:16 PM

well, damn, thought i had u.

mooseman

stitches4815 · « **Reply #25 on:** May 06, 2012, 08:49:47 PM »

I use Imagemate PC701. The only time I have issues with film sticking is when I am in a rush and the screen hasn't totally dried. When the screens are totally dry I just lift a corner of the film after exposire and it peels off. None of the ink has made a mark on the emulsion. Yesterday I had a last minute rush job come in and of course I didn't have any coated screens ready so I had to do a hurry up coating and drying and I ruined the film.

ericheartsu · « **Reply #26 on:** May 07, 2012, 01:09:07 AM »

Quote from: jasonl on May 06, 2012, 03:06:53 PM

does anyone attach films to the screen? dont know why you would do that.

We do, as we have an older press, and do not have a registration system for it. We register each film to the screen, and line up the films that way.

Frog · « **Reply #27 on:** May 07, 2012, 01:26:30 AM »

I do also. I have a grid on my tabletop screen board.I place films lining up with marks, and tape attached.
I then place my screens into set stop blocks, and press to stick the film.

I used to punch films and/or carrier sheets to fit on pins, but got away form that when I moved away from camera and rubylith during the vellum era, and never went back.

mooseman · « **Reply #28 on:** May 07, 2012, 06:14:32 AM »

here is our system, just a registration sheet that defines the pallet position under the screen, inner edges of MZX frames etc.
The set up assumes our press print head is roughly centered and the frame will join the back clamp normally.

The real value here is when we use multiple images in one screen or on multi color jobs.
On multi color prints we simply add the second color film ovet the film previously locating it to the art registertion marks then pulling the first film.
This insures we never run out of adjustment travel on the press or get a screem that mechanically can't be clamped in without aligning all images.
Here is a pic of the registration / placement sheet on the exposure glass, note that at the top of the picture there are a couple of pins, ( male half of large dress snaps) attached to the glass. Reg sheet has aligning holes in reinforced tabs.

http://i184.photobucket.com/albums/x296/copdaddy/MRS3DSCF3155.jpg

RICK STEFANICK · « **Reply #29 on:** May 08, 2012, 08:11:52 AM »

humidity is the issue. i put a air conditioner in the srcreen room and poof..no more tackiness

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