The UV dull film varnish is the ink that is transferred to the substrate after printing, and it is instantly cured by ultraviolet radiation to form the ink film. Based on its special drying principle, it determines its binder additives and the printing used. The equipment and method of use are different from ordinary oily and resin-based inks. At the same time, it also determines that UV matte film varnish has the advantages that ordinary oil-based inks do not have. Here is a brief analysis of its characteristics: (1) The drying speed is fast, and the back side will not be dirty or sticky during the printing process. There is no need to increase the powder to prevent the sticky and dirty adhesion, and purify the working environment. (2) Because the drying speed is fast, the production cycle is shortened, especially the products with post-press processing procedures, and the product storage space and venue are also reduced; (3) Excellent adhesion and abrasion resistance, and excellent water resistance, especially suitable for non-absorbent substrates such as PE paper and aluminum foil; (4) The emission of volatile solvent gas during ink drying is low, and it is non-toxic after drying, which is suitable for food or pharmaceutical packaging. Because UV dull film varnish is stored in different drying principles and chemical compositions than ordinary ink, there are many points to be noted during use. For example, the used printing plate, printing rubber roller, ink drying, ink cleaning and safety protection, ink storage, the following is a brief introduction to these aspects: 1. Plates for UV offset printing The PS plate can be divided into positive and negative plates according to its exposure imaging principle, because the ink transfer part (ie, the graphic part) on the positive plate is the photosensitive hardened photosensitive layer, and the blank part, the unexposed part, is dissolved and printed. When cleaning the printing plate in the process, you need to use a special cleaning agent to clean the printing plate, and the cleaning power of these cleaning agents is very strong. During the cleaning, the photosensitive layer on the graphic part of the plate may be dissolved to make it fall off. To reduce the printing plate's ability to transfer ink or scrap it, in order to prevent this problem, you need to use PS positive plate for baking plate processing or use UV special PS plate. The method of baking plate is to place the plate in the baking box. The temperature is about 250 ℃, and the baking time is 6-8 minutes. In this way, the inside of the photosensitive layer of the graphic version of the PS plate can be fully hardened, and at the same time, its abrasion resistance and solvent resistance can be improved. It is basically not used for UV printing PS negative plate, and the baking plate has no effect. 2. Rubber roller for printing Because the UV dumb film varnish contains chemical components such as acrylic resin monomers and photopolymerization initiators in the connecting material, and these components have a strong penetration or even dissolving ability for rubber, which will cause the rubber roller to expand and deform or age. And change its ink transmission performance, resulting in many printing failures, so ordinary offset printing ink rollers are not suitable for printing UV dumb film varnish, and printing UV dumb film varnish is best to use UV special rubber roller, sometimes even use UV special adhesive Various problems will also occur in the roller, such as the new rubber roller that has just been started. When ordinary ink and UV dull film varnish are used alternately, in order to prevent failures, the rubber roller can be pretreated. For example, pre-coat with UV dull film varnish thinner before printing for 24 hours, wash it before printing, apply UV dumb film varnish for idling for about 1 hour, then wash with cleaning agent and then ink print. 3. Drying of UV dumb film varnish The drying method and principle of UV matte film varnish are different from ordinary inks. It uses UV light to cause the photopolymerization of the internal components of the ink to instantaneously cure and dry. Its drying is different from the ordinary ink's wave, oxidation, and penetration drying methods. There are many things to note: (1) You must confirm whether the ink layer is really dry and thorough Due to various reasons, such as the ink layer is too thick, the ink with dark color and poor transparency, the intensity of light irradiation is not enough, the speed of the vehicle is too fast, etc., it will cause a false drying of the UV matte film ink layer, and the surface seems to be dry. The inside of the ink layer is not completely dry. Such pseudo-drying will cause the product to stick after a period of time. The odor is very large when used, the packaging is not suitable, and the wear resistance is poor. Lots of scrapped, resulting in huge losses, so pay special attention to this problem, there are several specific methods: The first is to use a transparent tape to do the peel test, stick the tape paper to the ink layer and smooth the tape by hand Pull down to see if the ink layer will stick. If it is, it is not completely dried, otherwise it means that the drying is good. The second method can be used for a friction test with a friction tester. If the deinking is serious, it is not completely dried; otherwise, it is well dried . 2) Light source for UV dumb film varnish drying The ultraviolet light for UV dumb film varnish drying is emitted by the ultraviolet lamp. The ultraviolet lamp used today is divided into two types: pressure mercury lamp and metal halogen lamp. These two lamps have different light waves due to different filling media. The wavelength of the mercury lamp is 200-400mm, and the wavelength of the metal halogen lamp is 250-450mm. Due to the different light waves, the effect is also different. If you want to strengthen the surface drying, use a high-pressure mercury lamp, such as colorless inks or inks with good light transmission; if printing dark series inks or inks with poor transparency, you need to strengthen the internal drying and use metal halogens The lights are better. Combining the advantages and disadvantages of these two lamps, they are generally used in combination and mix, which not only strengthens the surface hardening, but also strengthens the internal drying. However, when they are used together, it should be fully considered whether the specifications of the UV power supply of the equipment are compatible with the lamps. (3) Auxiliaries for UV dumb film varnish and precautions for cleaning and safety protection The auxiliary agent used for UV dull film varnish must be special and supporting. Do not use auxiliary agents such as thinner for ordinary ink, otherwise it will produce undesirable consequences such as poor drying and poor transmission. The auxiliary agent must be limited before use. Mostly, it is generally controlled within 5% and inks produced by different manufacturers have different composition of additives. It is best to use the ink manufacturers provided or recommended, and the inks of different manufacturers can not be mixed. The cleaning of UV dull film varnish has its special cleaning agent, and cannot be cleaned with gasoline, kerosene or alcohol. Because the UV dumb varnish cleaner has strong dissolving power, if it touches the skin accidentally or splashes into the eyes, it will cause the skin to become red or swollen or burn, so please pay attention to it, wear protective gloves during cleaning, and wear protective glasses if necessary In order to prevent burns to the eyes, in addition, if the UV dumb film varnish is accidentally stuck on the device, the non-UV paint surface protective coating cannot be wiped with UV cleaners, otherwise the surface will be dissolved and wiped off. 4. Precautions for storage of UV dumb film varnish Due to its special drying principle and chemical composition, UV dull film varnish should pay special attention to avoid light and heat insulation during storage. Because the solar spectrum contains a lot of ultraviolet rays, when the sunlight directly or indirectly shines on the ink surface, it will cause the surface of the UV dull film varnish to harden and crust, which will cause waste and printing failures. At the same time, the long-term fluorescent lamp irradiation will also be caused by ultraviolet The ink is hardened, so it is best to use an isolated fluorescent lamp, especially the illumination light source on the ink fountain of the printing machine, so the UV dumb film varnish should be protected from light. At the same time, when the ink temperature exceeds 30 ℃, the ink will have a chemical reaction. One of the consequences is hardening and drying; the second is gelation, which increases the viscosity and reduces the printability, especially the remaining ink that has been used. Therefore, UV dull varnish should be stored in a cool place as much as possible. V. Arrangement of color sequence of printing process Because different colors and types of inks have different absorption and transmittance of ultraviolet rays and affect their drying and curing speed, they should be fully considered when arranging printing color sequence. High-concentration white and dark colors, such as black and blue, as well as some spot colors and gold and silver inks, have particularly strong reflection and absorption of ultraviolet light, and poor transmission of ultraviolet light, so the drying and curing speed is slower. When it is allowed, it should be printed in advance in order to increase the number of times of irradiation to enhance drying. And yellow, magenta and other colors with better drying performance can be post printed. When adjusting the ink with a slower drying speed, a photo-curing initiator can be added appropriately to speed up its drying and curing, but excessive addition will hinder its curing speed, so its addition should be controlled within 4%, affecting the UV dull film varnish Another factor for drying and curing is the thickness of the ink layer. The thicker the ink layer, the slower the curing speed; otherwise, the better. Based on the above analysis, it can be seen that in use, the UV dull film varnish has different places from other inks, and there are more factors that affect its final printing effect. Any mistake in any link will have varying degrees of consequences, so only A full understanding of the composition and use of UV dull film varnish can fully exploit and tap the advantages of UV dumb film varnish to produce ideal high-quality products. It is new latest design 1000W Hair Dryer. it comes with hot and cool function and also comes with hi and low function . so it have dual switch control. that is not comes with other.in today's day and age, it comes with good quality and low price. so all can afford it. From room occupying appliances and pocket-fitting devices, to meters and meters of cables, no home is stranger to any of these. Hair Dryer 1000W,best ionic hair dryers,best hair dryer under $100,best hair dryer for fine blonde hair,best affordable hair dryer Ningbo Meirou Electric Appliance Co.,Ltd. , https://www.mrhairstraightener.com