Emulsion - Saatichem Textil PV and other questions

Guille_507

Hello

I have a lot of question about screen print .

Sorry for my orthography . i don't speak fully English

I am really new on screen print I use to use hand cut stencils (green an red ulano) to do screen print . I learn a few things in youtube about emulsions

Now i trying to do it with these Emulsion - Saatichem Textil PV .

I have a few concerns .

first is good,

I have to be on fully dark to put the emulsion.

What type of color bulb, if could use

How long i need it to let it dry

Works with plastisol and aquaprint inks


thanks
Guille_507

screenprintguy

i have used a ton of different types of emulsions,from autotype, to unlano, to cromaline, several brands that were privately labeled by suppliers, the Saatichem Textil PV is now my fave. i was about to spend the extra money to switch exposure units to a metal halide version light source to help speed things up but i was talked into trying the textil pv and found that it cut my expose times down dramaticly, if i use laser film which is cloudy like vellum i can expose a white mesh in 4 mins, if i go completely clear inkjet film 2 mins in white mesh. yellow add a min to two mins two each instance. i currently use the point 1000 by workhorse for exposing which is a 1000 watt halogen bulb, not the best out there but i got a great deal on it and now using this pv emulsion spending almost 4,ooo bucks to go into a different exposure unit to gain 1 minute isnt worth it to me. ive also noticed that using the textile pv emulsion i shot a 5 color simulated process job on 155 yellow mesh screens with a frequency of 50 and this emulsion actually held those dots on that big mesh, other emulsions wouldnt hang with that and you would lose your image. i hope some of this helps, sorry for the bad spelling and all but you know how that goes,

jr_sanford

Hey Guille, I use Murkami's Aquasol HV which (in my opinion) is THE MOST durable emulsion out there. I coat the screens in a "darkroom" that has a red light bulb for visibility. One coat on the outside - flip the screen 180º to the squeegee side and apply one more coat of emulsion. I use a small plastic scraper to remove the excess emulsion that is along the sides where the emulsion applicator over flowed a bit. I dry the screens squeegee side up in the (dust free) dark room at 80º for about ½ hour, or until I can touch the coated screen and feel that the emulsion is hard and dry.

My light table has a 1000w halogen bulb and I expose my 156 mesh screens for 5 minutes and 50 seconds which allows me to have my half tones to remain intact with sharp definition.

J.R. Sanford
Production Manager
NW Awards
185 NW Chehalis AV
Chehalis, WA 98532
(shop) 360-748-7346
(cell) 360-880-6384

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twistedfuks

thank you for the time breakdowns... just got PV and it so happens, I have a similar set up.. National Exposure with 1000 watt halogen.... so now I have a starting point. thanks

Binkspot

IMO the PV is a great emulsion for the price. We use it for almost everything we do. It coats, shoots and reclaims well. Holds good half tones for all but the most detailed work. The PV also coats well across a wide range of mesh, we normally use everything from 25-355 and will give a nice thick stencil if applied propperly. I coat our screens out in the shop with the lights off, usually enough light from the windows to see what I am doing. If it is night I will just turn a light on at the other end of the shop. The amount of light the emulision absorbs while coating is insignificant. I coat 20-40 screens a day and never had an issue. A dark room with uv safe bulbs is ideal but not always practical. I then place the screen in our dark room which is kept at 95-100 degrees and about 10% humidity. The screens are ready to burn in less then an hour, if I am in a rush the screen can go in front of the fan and ready in 30 min. The PV will hold up to WB and discharge if post exposed for short runs, maybe 25 prints. If you are going to do WB or discharge I would recomend the DW but the shelf life is only a few weeks once mixed. We use 1-2 gallons a week so a non issue but if you are only coating 4-5 screens a week then get a quart to mix. Burn times will vary but most of ours are less then a min on white or yellow mesh 3k MH exposure unit coated 3/2. Get an exposure calculator and follow the directions. As the bulbs age they still emit uv but get weaker so depending on the condition of the bulb your times may be longer or shorter. We test ours when trying new emulision, new bulb and every six months and make adjustments if necessary.

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