How to test exposure time... in the sun

Here you can discuss issues related to exposing screens for screen printing. This includes determining the exposure, light sources and washing out the stencil in the washout booth. Emulsion issues may also be addressed here.

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How to test exposure time... in the sun

Postby nexal » Fri Apr 21, 2017 2:27 am

Hello and thank you so much for all the great knowledge you have put out there.
We've been printing on fabric for a year or so using the stencil and dabbing technique, which is cool for simple designs (can actually make gradients once you get the hang of it) but now we want to graduate to screen printing. Thing is we live in a very sunny place and we actually love the idea of exposing our emulsion in the sun (there is the issue that we can't afford to buy professional equipment at this time, but hey, we're romantics). The company making the emulsion (jacquard) states that sun exposure is possible, so that's covered but the question is: how to test for proper exposure time (ET)? The manufacturer states 10 to 45 sec ET. Assuming sunrise at 7:00 and sunset at 20:00, we've tried several exposures between 12:00 and 13:30 for 40 seconds.
We are not getting consistent results. Would you have any suggestion(s) for an experimental setup to test the emulsion more consistently?

Thank you in advance for your time.

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