Characteristics and uses of the hottest UV metal i

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Characteristics and uses of UV metal inks (III)

selection of UV metal inks

when selecting UV metal inks, we should suit the remedy to the case. On the one hand, we should understand the performance of metal substrates, on the other hand, we should understand the characteristics and scope of application of different types of UV metal inks, so as to make high-quality products, reduce costs and shorten the delivery time. Some metals can't find a suitable ink at the moment, so the metal surface must be treated before printing, or use heat curing ink

for general metal products such as copper, aluminum, iron and brushed stainless steel, after cleaning the surface oil and dust, U V - mi - 20 series UV curing metal ink can be directly printed without any treatment of the metal. This kind of oil 10. The isolation method ink does not contain volatile solvents, has no smell, does not block printing, has fast curing speed, high hardness, high gloss, excellent scrub resistance, and high production efficiency. It is an ideal ink for the production of various metal signs. For some products, customers emphasize excellent physical and chemical indicators. For example, for outdoor signs, the ink pattern must be sun resistant and weather resistant. When buying ink, we must pay attention to its sun resistance indicators. Table 2 lists some technical indicators of uv-mi-20 series inks

uv-mi-25 light curing special metal ink is specially used for printing various metal substrates that are difficult to adhere. Common metal products can be roughly divided into three categories

1) the surface treated metal substrates such as mirror stainless steel, mirror titanium gold plate, high gloss aluminum plate, chromium plating, nickel, silver, nickel/gold and other metal surfaces have high gloss and strong decorative effect, but the ink is not easy to adhere after printing, especially for UV ink, the curing speed is very fast, and the curing film shrinks during the curing process. It is not easy to achieve good fastness when printing on high gloss metal substrates. After printing uv-mi-25 UV curing ink, it is recommended to dry it in a UV oven with infrared heating device. If your UV curing machine does not have such a device, you can add one yourself

2) for the metal coated on the surface, such as the metal substrate that has been sprayed with plastic (powder paint) or coated with thermosetting paint according to the world bank's global business environment report, in order to make the small molecular additives in the ink fully penetrate and wet the substrate, do not cure immediately after printing uv-mi-25 ink. You can park it for a few minutes, and then dry it with the above-mentioned u v equipment with hot air device. Generally, thermosetting powder coatings include polyester resin and epoxy resin. A large number of polypropylene, polyethylene wax powder and silicone additives are added to the formula. During the hot melting process of powder coatings, wax powder and additives will float on the surface of the coating, which is the main reason for the poor adhesion of UV ink. The situation of baking paint is similar

3) for metal products with uneven or porous surface, the reason why the substrate is not easy to adhere to UV ink is mainly due to its uneven surface, small contact surface with the ink, and holes between the ink curing film and the porous substrate. After printing uv-mi-25 ink, infrared or hot air must be used to enhance the fluidity of the ink, so that the ink flows into the pit before UV curing

for products that need stamping and bending, such as thin aluminum plate, copper plate and other metal decorative plates, in addition to good adhesion, hardness and color, the cured film must also have excellent tensile resistance to ensure that the cured layer can change with the deformation of the substrate without fracture. At this time, it is necessary to choose U V -mi-105 series anti stamping elastic UV metal ink, and the printing ink layer cannot be too thick

u V metal cover varnish is mainly used to increase the surface gloss of metal products and improve the acid and alkali resistance, moisture resistance and scratch resistance of products. Different types of varnish also have their own characteristics to meet special needs

uv-mi-20n does not contain volatile solvents, with fast curing and low price. It has good adhesion to copper, aluminum, iron and other metal substrates. It is the most common UV varnish, which is suitable for the shading of general metal products. Uv-802ns elastic metal varnish, with high transparency of the cured film, has excellent adhesion to mirror aluminum plate, titanium plate, mirror stainless steel plate and other metals, and the cured film has good toughness and will not crack during embossing

special effect U V metal ink belongs to art ink, which emphasizes the decorative effect of ink. This kind of ink can be divided into two categories. One is that special additives or additives are added to the ink, which will show special effects after printing, such as UV sanding, UV frosting, UV matte, UV hammer, u v foaming, u v colored sand, u v fragrance and other inks; The other is developed according to the characteristics of UV curing, such as UV wrinkles, UV ice flowers, UV crystals, UV refraction, etc. Table 3 lists the technical indicators and effect descriptions of several UV special effect inks of Kewang company. Figures 7 to 13 are templates made of several special effect UV metal inks

compared with general corrosion-resistant inks, UV corrosion-resistant series inks have stronger resistance to strong acid or alkali attack. Different types of anti-corrosion inks have different uses. Lpr-800, lpr-820, lpr-811, lpr-812, etc. are used for fine etching, and some are used for special metal etching, which will not be detailed in this article. It is worth mentioning the etching of aluminum metal. Aluminum is an amphoteric metal, which is afraid of both acid and alkali, so it can be corroded by both acid and alkali. At the same time, it also determines that aluminum can not be developed and removed by alkali, nor can it be developed and removed by acid, but can only be developed and removed by liquid without corrosion to aluminum. At present, there are two commonly used products: 1) lpr-820n liquid photosensitive varnish, colorless and transparent, developed with al-001 aluminum special developer, can be directly electrophoretically colored and baked at high temperature after etching, and the final product can be obtained without removing the film with caustic soda; 2) LPR-805 liquid photosensitive acid and alkali resistant anti-corrosive ink has the dual functions of acid and alkali resistance. It uses neutral alcohol mixed development solution, but its control accuracy and control range are very high. It uses a wide range of agents (LPR-805 special development water) for development. Polar solvents such as cyclohexanone, 783, etc. are used for film removal. The developer and film removal solution can be recycled. It can be used for both acid etching and strong alkali corrosion. After removing the film, it has no impact on the substrate. It is mainly used for the etching of corrosion-resistant graphics of precision metal aluminum

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