![]() How to strengthen stencils with post-exposure The same is the case for dual-cure emulsions. If the emulsion has been properly cured, the emulsion won’t continue to react and strengthen with additional exposure. Diazo emulsion, on the other hand, fully bonds during exposure. When exposed to more UV light, the photopolymers will continue to react and bond for a stronger stencil. That’s because even when a photopolymer is exposed adequately enough for use, not all of the polymers have bonded. In general, post-exposure is most valuable for photopolymer emulsions. Depending on the type of emulsion you use, exposing your stencil to more UV light after the screen has been washed out can cause more of the photoreactive chemicals to link, strengthening their bonds and strengthening the stencil. When you expose your screens, the UV light emitted by your exposure unit causes a reaction within the emulsion that hardens, or cures, your stencil. Post exposure can, in fact, create more durable screen printing stencils that will better withstand long press runs or prolonged contact with water-based inks. But does post-exposure really increase stencil durability? How can you take advantage of post-exposure to create more durable screen printing stencils? The value of post-exposure depends on your emulsion That is, exposing screens coated in photosensitive emulsion to more UV light after they have been exposed and washed out. To combat this, many screen printers turn to post-exposure. Stencils that soften or break down during long press runs or when used with water-based inks can slow production and lead to misprints and waste. Every screen printer wants to create durable stencils that don’t degrade over the course of a print run.
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