As a kind of decoration method favored by people at present, screen printing, in all its advantages and characteristics, the durability of screen printing ink is a key. Both solvent-based and UV-curable inks give the prints rich colors while also helping the prints to avoid damage and abrasion, discoloration, and Other environmental factors during handling. The use of screen printing inks with these functions in combination with durable substrates can bring us beautiful prints.
Metal substrates, such as steel and aluminum, have high quality examples of screen printing applications such as metal signs, nameplates, instrument belts, containers, and many other products that often rely on screen printing inks for printing functional images or imprints. However, such printing is a big challenge for some screen printing manufacturers who have no experience in printing metal substrates.
If you need to print on metal materials, the pre-print preparation work must be sufficient. Understanding the natural properties of the coating on metal materials, the production tolerance of the material, and the best combination of ink and substrate, which play a decisive role in the success of printing. To effectively use these materials, printers must first understand the main attributes of these metal materials.
In addition, screen printing inks suitable for different materials and different image requirements have to be found.
Understanding metal substrates
Usually, when we talk about screen printing on metal, the metal in question is not an unprocessed metal material, most of which are coated or processed metal materials. There are about two kinds of coating on metal: thermoplastic coating and thermosetting resin coating.
The thermoplastic coating does not undergo a chemical reaction during the drying process of the substrate, and its drying is completely achieved by evaporation or heating. During the heating process, the coating material is fused with the metal. In the thermoplastic coating of metallic materials, it must be remembered that such coatings cannot resist the corrosion of high temperature and aggressive solvents, in other words, the coatings on metals encounter high temperatures or erosion in the process of screen printing. The solvent will melt again.
Thermosetting resin coatings are generally "polymerized" or "crosslinked"
Chemical reaction to achieve curing. After the coated metal is heated at a high temperature for a long period of time, the coating can be dried to withstand high temperatures and re-melting, and it also has high resistance to solvent corrosion and wear.
Resin systems that can be used as metal-coated base materials are ethylene (plastisol or solution systems), polyester or acrylic, and the like. The vinyl coating is thermoplastic. Although it is softer than the thermosetting coating and more readily attaches ink, the thermoplastic coating has poor chemical resistance and abrasion properties, making them vulnerable to most screen printing applications. limit. Therefore, screen printers prefer to use metal substrates with thermosetting coatings.
Polyester and acrylic are the most common resins in thermosetting coatings. Thermoset coatings, unlike soft thermoplastic coatings, are insoluble in screen printing inks and have a harder crosslinked protective layer that makes it difficult for ink to adhere to the coating.
Metal substrates, such as steel and aluminum, have high quality examples of screen printing applications such as metal signs, nameplates, instrument belts, containers, and many other products that often rely on screen printing inks for printing functional images or imprints. However, such printing is a big challenge for some screen printing manufacturers who have no experience in printing metal substrates.
If you need to print on metal materials, the pre-print preparation work must be sufficient. Understanding the natural properties of the coating on metal materials, the production tolerance of the material, and the best combination of ink and substrate, which play a decisive role in the success of printing. To effectively use these materials, printers must first understand the main attributes of these metal materials.
In addition, screen printing inks suitable for different materials and different image requirements have to be found.
Understanding metal substrates
Usually, when we talk about screen printing on metal, the metal in question is not an unprocessed metal material, most of which are coated or processed metal materials. There are about two kinds of coating on metal: thermoplastic coating and thermosetting resin coating.
The thermoplastic coating does not undergo a chemical reaction during the drying process of the substrate, and its drying is completely achieved by evaporation or heating. During the heating process, the coating material is fused with the metal. In the thermoplastic coating of metallic materials, it must be remembered that such coatings cannot resist the corrosion of high temperature and aggressive solvents, in other words, the coatings on metals encounter high temperatures or erosion in the process of screen printing. The solvent will melt again.
Thermosetting resin coatings are generally "polymerized" or "crosslinked"
Chemical reaction to achieve curing. After the coated metal is heated at a high temperature for a long period of time, the coating can be dried to withstand high temperatures and re-melting, and it also has high resistance to solvent corrosion and wear.
Resin systems that can be used as metal-coated base materials are ethylene (plastisol or solution systems), polyester or acrylic, and the like. The vinyl coating is thermoplastic. Although it is softer than the thermosetting coating and more readily attaches ink, the thermoplastic coating has poor chemical resistance and abrasion properties, making them vulnerable to most screen printing applications. limit. Therefore, screen printers prefer to use metal substrates with thermosetting coatings.
Polyester and acrylic are the most common resins in thermosetting coatings. Thermoset coatings, unlike soft thermoplastic coatings, are insoluble in screen printing inks and have a harder crosslinked protective layer that makes it difficult for ink to adhere to the coating.
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