Kornit’s Digital Printing Glossary
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Photopolymer Emulsion
What Is Photopolymer Emulsion?
In screen printing, photopolymer emulsion is a light-sensitive coating applied to a screen to create a stencil. When exposed to UV light, the emulsion hardens in specific areas, forming a durable image that allows ink to pass through only where needed.
This process is necessary for transferring designs onto garments, textiles, and other materials with precision.
Photopolymer emulsions are widely used because they simplify the screen preparation process and support high-resolution detail.
How Photopolymer Emulsion Works
The emulsion process is an important part of the screen printing setup. It includes:
- Coating the screen: A thin layer of emulsion is evenly applied to the mesh.
- Drying: The coated screen is left to dry in a dark environment to prevent premature exposure.
- Exposure: A film positive is placed on the screen, and UV light hardens the exposed areas.
- Washout: Unexposed emulsion is rinsed away, leaving a stencil of the design.
- Curing: The hardened emulsion forms a durable stencil ready for printing.
This method allows printers to reproduce the same design across multiple garments with consistent quality.
Photopolymer Emulsion vs Other Emulsions
Screen printers can choose between different emulsion types depending on their needs.
Photopolymer emulsions are:
- Pre-sensitized and ready to use
- Faster to expose under UV light
- Ideal for high-volume production
Other types, such as diazo emulsions, may offer longer shelf life or greater exposure flexibility but tend to require mixing and longer processing times.
Photopolymer Emulsion in Modern Printing
While photopolymer emulsions remain essential in traditional screen printing, digital textile printing technologies eliminate the need for screens and emulsions altogether.
Digital workflows allow printers to produce designs directly from file to fabric, reducing setup time and enabling on-demand production.
Kornit’s digital textile printing technology simplifies production while maintaining high-quality results. Contact us to discuss adding DTG printing to your screen printing tech stack.
FAQs
What does photopolymer mean?
A photopolymer is a material that changes its properties when exposed to light, usually UV light. In screen printing, it hardens when exposed, allowing it to form a stencil.
What emulsion is best for screen printing?
The best emulsion depends on the application. Photopolymer emulsions are preferred for speed and detail, while diazo emulsions may be better for longer runs or specific ink types.
What is photo emulsion made of?
Photo emulsion is typically made from a combination of light-sensitive polymers, water, and binding agents. These components allow the emulsion to harden when exposed to light and adhere to the screen mesh.
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