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screen printing => Ink and Chemicals => Topic started by: balloonguy on January 10, 2019, 10:42:33 AM

Title: discharge emulsion question
Post by: balloonguy on January 10, 2019, 10:42:33 AM

do all emulsions for discharge diazo activated? Does anyone make a cap film that can be used for discharge/water base? I get a call for it 3 - 4 times a year. I don't want to buy a gallon every time. This one is very short run. It is 36 pieces.
Thanks.

Title: Re: discharge emulsion question
Post by: Maff on January 10, 2019, 11:01:19 AM

There are photopolymer emulsions rated for discharge and waterbase that can be Post Exposed and will hold up fine especially for short runs.
You could also try using a reclaimable hardener spray. 
For a 36 piece run you may be able to just run the emulsion you have with a hardener or post expose it if it's a photopolymer.

Title: Re: discharge emulsion question
Post by: Orion on January 10, 2019, 01:46:05 PM

Take a look at KIWO MultiTex.

Title: Re: discharge emulsion question
Post by: kirkwad on January 10, 2019, 02:05:54 PM

Quote from: Orion on January 10, 2019, 01:46:05 PM

Take a look at KIWO MultiTex.

Yeah, KIWO MultiTex works good. Also Saati PHU 2 works good as well. You could always just buy a quart of emulsion & bust it out when needed. Most photopolymer emulsions have a good shelf life.

Title: Re: discharge emulsion question
Post by: balloonguy on January 10, 2019, 06:38:56 PM

Thanks. I will try the saati. I can get it very easily. It is such a small run I just want it to be easy.

Title: Re: discharge emulsion question
Post by: kirkwad on January 11, 2019, 08:28:17 AM

Be sure to post expose your screens for optimal resistance.

Title: Re: discharge emulsion question
Post by: screenxpress on January 11, 2019, 11:43:10 AM

I would not discount quarts of Green Galaxy CryoCoat Emulsion which is marketed as good for discharge, plastisol, and waterbase without the need of a hardener.   

I have used it on low production discharge runs and I don't like to buy a two part emulsion that has a short life after mixing.  I use it for both discharge and plastisol.  It's very cost effective.   

And our Danny Gruninger has posted his testimonial (paid? lol) of the product with various test exposure results
https://www.screenprinting.com/products/green-galaxy-cryocoat-emulsion (https://www.screenprinting.com/products/green-galaxy-cryocoat-emulsion)

Title: Re: discharge emulsion question
Post by: tonypep on January 11, 2019, 11:55:43 AM

A reminder....don't forget the exposure unit as a variable. Flourescent, halide, and LED units may often yield different results.

Title: Re: discharge emulsion question
Post by: balloonguy on January 11, 2019, 01:42:20 PM

Thanks for the info. I normally leave my screens in the FL sun to dry. Will that work for post expose or should they go back in the exposure unit?

Title: Re: discharge emulsion question
Post by: tonypep on January 11, 2019, 01:58:01 PM

Depends on the weather! Either way post exposing and hardening is just good insurance.

Title: Re: discharge emulsion question
Post by: Rockers on January 11, 2019, 11:53:53 PM

Chromaline ChromaTech DEX will work in that case. It`s an SBQ emulsion.