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What is photo emulsion

What does photo emulsion do?

Photo Emulsion (used with the accompanying Diazo Sensitizer) is a light-sensitive emulsion used to burn stencils directly into a silk screen for photo imaging. It is the staple emulsion for making screens with photos, lettering, logos or detailed images.

Is photo emulsion dangerous?

Its toxicity is mainly localized to the screenprinter when it is cured by the heat and water vapor can carry the formaldehyde fumes into the shop area to be breathed in. emulsion remover is non-toxic.

What is photo emulsion and sensitizer?

Photo Emulsion is a vital part of a silk screener’s arsenal. It is a photosensitive, thick liquid that, when combined with the sensitizer, is used as a medium to “burn” an image onto a screen. … The area of your image that is dark is the area that ink will go through when you’re ready to print.

How long do you expose photo emulsion?

Different photo emulsions require different exposures, but most can be done under a typical 60 watt incandescent light bulb in a few hours, with a makeshift reflector made out of a 10 or 12″ pie pan. Stronger lights will require less time to develop, perhaps as little as 15 minutes depending on conditions.

How long can you leave photo emulsion on a screen?

Any emulsion that has diazo added (Dual Cures, Diazo, and hybrid emulsions) as a sensitizer will last about 4 weeks of optimum sensitivity as long as storage conditions are light safe and below 80F degrees. A pure photopolymer emulsion coated screen can last up to 6 months and is unaffected by heat.

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How long does it take for photo emulsion to dry?

4 to 8 hours

What is meant by emulsion?

An emulsion is mixture of two liquids that would not normally mix. That is to say, a mixture of two immiscible liquids. By definition, an emulsion contains tiny particles of one liquid suspended in another. … A classic example of an emulsion is oil and water when mixed slowly under vigorous stirring.

Is screen printing bad for your health?

Exposure to the fumes emitted by common screen printing products can ultimately cause a myriad of health issues, from minor sinus irritation to respiratory problems to even cancer.

What is screen printing emulsion made of?

Screen Printing Emulsion: The Science Behind It

Most screen printing emulsion contain two chemical polymers: polyvinyl acetate, a water-resistant polymer often referred to as PVAC; and polyvinyl alcohol (PVOH), a solvent-resistant polymer.

How long should you expose a silk screen?

A good time to start with is five minutes. Immediately following exposure, wash out the screens with water and a sponge, or a spray nozzle if you have one in your classroom. You will see some of the emulsion begin to leave the screen in the areas that were protected by the image printed on the film positive.

How do you use Diazo photo emulsion?

How to use Diazo Photo Emulsion

  1. Step 1) To start you need a grease-free, clean, dry screen. …
  2. Step 2) Following the instructions on the bottle, fill the sensitiser half full with cold water and mix well. …
  3. Step 3) Pour some photo emulsion into the scoop coater and allow it to settle. …
  4. Step 4) Place the coated screen horizontally somewhere dark to dry.
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Can you over expose photo emulsion?

Over-exposure causes a loss of detail in your image area. When photo emulsion is exposed to UV light, it polymerizes or will crosslink, making it more difficult to wash out. … Extreme over-exposure can “burn” through the opaque areas of the film positive rendering the stencil a solid block of hardened emulsion.

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