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In the field of flexographic printing, surface finishing can not only improve the light resistance, water resistance, heat resistance, folding resistance, abrasion resistance, chemical resistance of the printed surface, but also increase the gloss and artistic sense of the printed materials, thereby playing a role in the protection and beautification of the printed materials, and improving the value of the printed materials. Common methods for surface finishing of printed matter are varnishing, film laminating, foil stamping, die-cutting, creasing or other processing treatments. For most manufacturers, film laminating and varnishing is essential. The function of these two processes is very similar, both can play a certain role in finishing and protecting the surface of printed materials such as cosmetic cartons, potato chip bags, ice cream paper bowls, but there are some differences between the two. This article will introduce the film laminating and varnishing in the flexography printing from the three aspects of meaning, function, and specific application.

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Meanings of Film Lamination & Varnishing

Film lamination and varnishing are two common surface finishing processes.

Film Lamination

Film lamination is a post-printing process that covers the surface of printed materials with a plastic film coated with adhesive, and then heats and pressurizes it to tightly combine the printed material and the plastic film to form a paper-plastic composite product. Film lamination is a dry lamination method used in paper-plastic composite processing. Common products in our lives, such as promotional posters, toothpaste cartons, biscuit cartons, perfume cartons, award certificates, magazines, promotional labels, etc., can all use this process.

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Varnishing

Varnishing is a process of coating (or spraying or printing) a layer of clear coating on the surface of printed materials, and then forming a thin and uniform transparent bright layer on the surface of printed materials after leveling and drying (calendering). The process is the process of coating (commonly known as varnishing oil, including film-forming resin, solvent and additives) applied to the surface of printed materials for leveling and drying. Common products in our lives such as popcorn paper bowls, milk tea paper cups, disinfectant bottle labels, soap packaging paper boxes, take-out paper bags, etc. can all use this process.

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Functions of Film Lamination & Varnishing

After covering the surface of luxury paper bags, lipstick cartons, honor certificates, book covers, jewelry cartons, coffee paper cups, hamburger wrapping paper, perfume gift boxes and other printed materials with a layer of plastic film (film laminating) or applying a layer of varnish coating (varnishing), they can all be made to have the functions of friction-resistant, moisture-resistant, water-resistant and stain resistant. Film laminating and varnishing not only protects the printed material, prolongs its service life, but also improves the gloss level and color vibrancy of the surface, enhances the visual effect and aesthetic appeal, thus improving the grade and added value of the goods.

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Therefore, film laminating and varnishing are the main post-printing surface finishing technologies for printed products. They can not only make the surface of the printed materials “brighter” , attracting the eyes of consumers, but also protect the printed materials and improve their performance. They are now widely used in business cards, document paper bags, envelopes, Christmas cards, pet food paper bags, fries chicken paper box, water bottle label and so on.

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Specific Application of Film Lamination & Varnishing

Film Lamination

According to the different adhesive materials used, film lamination can be divided into solvent-based adhesive lamination and water-based adhesive lamination. Solvent-based adhesive lamination is suitable for packaging products with high gloss requirements and less stringent environmental requirements. Water-based adhesive lamination is widely used in wine bottle labels, chocolate wrappers, medicine boxes, red wine bottle labels, children's toys packaging cartons, cigarettes and other packaging with high requirements for environmental protection and safety.

Lamination in Flexography

Varnishing

According to the type of coating, varnishing can be mainly divided into solvent-based varnishing, water-based varnishing, UV varnishing, etc. Solvent-based varnishing has low cost, but it pollutes the environment and is harmful to the human body. It is more suitable for ordinary printed materials such as electronic product packaging cartons; the process of water-based varnishing has no irritating odor, no pollution to the environment, and no harm to the human body. It is widely used in candy paper bags, cake paper cups, medicine bottle labels and other products in tobacco, pharmaceutical, food, and cosmetics industries that have extremely high safety requirements for product packaging; UV varnishing has good gloss, strong heat resistance and wear resistance, and is safe and environmentally friendly. It is especially suitable for luxury gift boxes, hardcover book covers, high-end wine labels, jewelry boxes and other high-end product packaging that have extremely high gloss and wear resistance requirements.

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In conclusion, although film lamination and varnishing in flexographic printing are similar in function but have their own distinctive features. Lamination, with its powerful protection and significant gloss enhancing effect, is suitable for products with high durability requirements, such as book covers and pharmaceutical cartons. Varnishing has become the ideal choice for promotional labels, shopping paper bags, baking paper, sandwich wrappers and many other printed products with its environmental friendliness, cost-effectiveness and diversified visual effects. Whether it is the pursuit of ultimate protection or focusing on environmental protection and economy, choosing the right process can make printed products achieve a perfect balance between aesthetics and practicality, further enhancing their market competitiveness and added value.