Q
how long to expose photo emulsion in sun
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
Exposing photo emulsion to sunlight for screen printing requires precision since sunlight is much stronger than standard exposure units. Typically, exposure times can be very short, ranging from 30 seconds to a few minutes, depending on the sun's intensity and the emulsion type used. Direct midday sunlight will drastically reduce exposure time compared to early morning or late afternoon light. It's crucial to conduct exposure tests with small increments to find the optimal time for your specific conditions, as overexposure can harden the emulsion too much, preventing it from washing out properly, while underexposure will result in an incomplete cure. Always consult the emulsion manufacturer's recommendations, as formulations can vary widely.
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