In the world of offset printing, a flood coat refers to a specific technique used to apply a uniform layer of ink or coating across the entire surface of a printing sheet. Unlike spot UV, which targets specific areas of a print job, flood coating covers the entire page, from edge to edge, without leaving any portion untouched. This process is crucial for several reasons, ranging from aesthetic enhancements to functional purposes in print production. Let’s delve deeper into what flood coating entails and its significance in offset printing.
Purpose of Flood Coating
- Enhanced Appearance: Flood coating can significantly improve the visual appeal of printed materials. By applying a uniform layer of varnish or ink, it adds vibrancy to colors, making them pop out more. It’s particularly useful for achieving a high-quality, glossy finish or for creating a matte surface, depending on the desired effect.
- Protection: Beyond aesthetics, flood coating serves a protective function. It shields the printed material from moisture, dirt, and wear and tear, extending its lifespan. This is especially important for products that require durability, such as packaging materials and business cards.
- Preparation for Further Processing: In some cases, flood coating is used to prepare the printed material for additional processing steps. For example, applying a layer of varnish might be necessary before embossing or foil stamping to ensure the final embellishments adhere properly and are displayed to their fullest effect.
Types of Flood Coats
- Varnish Flood Coats: Varnish is often used for flood coating to add a glossy or matte finish. It enhances the appearance while providing protection against external elements.
- Ink-based Flood Coats: Sometimes, a transparent or colored ink is applied as a flood coat. This is particularly useful when a designer wishes to achieve a specific background color or effect across the entire sheet.
- UV Coating: UV coatings are applied and then cured under ultraviolet light, creating a highly durable and glossy surface. This type of flood coat is known for its ability to significantly enhance color depth and resistance to physical damage.
The Process
The process of applying a flood coat in offset printing typically involves running the printed sheets through a separate coating unit after the initial ink application stages. This can be done in-line with the printing process or as a separate post-printing step, depending on the equipment and specific requirements of the print job. The choice of coating material (varnish, ink, or UV coating) depends on the desired outcome in terms of appearance and functionality.
Considerations
While flood coating can add value to printed materials, it’s not always necessary for every project. The decision to use a flood coat should be based on factors like the intended use of the product, budget, and desired aesthetic effect. Additionally, it’s important to consider the compatibility of the chosen coating with the paper stock and ink to avoid potential issues such as smudging or uneven application.
Conclusion
Flood coating in offset printing is a versatile technique that serves both aesthetic and protective purposes. Whether it’s adding a touch of gloss for visual appeal or safeguarding materials against wear and tear, flood coating enhances the quality and durability of printed products. Understanding its applications and benefits can help designers and printers make informed decisions, ensuring that every print job meets the highest standards of excellence.
If you have any questions about printing, feel free to reach out to us at 718-928-6888 or submit our quote request form. We’re here to assist you in any way we can.
Take care!
Jeff @ New York Printing Center
