金屬移?。∕etal pad printing）

1、金屬移?。∕etal pad printing）Pad printing: pad printing is one of the special printing methods. It can print characters, graphics and images on the surface of irregular objects, and now it is becoming an important special printing. For example, the text and pattern on the surface of the mobile phone are

2、printed in this way, as well as the surface printing of many electronic products such as computer keyboard, instrument, instrument and so on, which are finished by pad printing.Printing plateThe use of the printing process printing steel version in the dominant, thick steel plate cup transfer printi

3、ng machine plate printing machine and 16% 100% the use of about 15mm in thickness; oil cup printing machine and 77% use thin steel plate thickness in the 0.25mm and 0.5mm, both the thin steel plate or thick steel plate, plate making process the same. The substrate used is roughly the same. The steel

4、 plate must have a fine structure, and the surface finish should be high enough. The former ensures uniformity of the edge of the corrosion, thus ensuring the integrity of the network structure, make the printing graphic edge sharpness and color reduction to achieve maximum extent; the latter guaran

5、tee the clean degree of scraping and resistance rate. The surface tolerance of thick steel plate using cup printing machine on the surface is more demanding, excessive tolerance on one hand to accelerate the wear of oil cup, on the other hand, the relationship with the sealing properties of the ink

6、used in printing machine, oil pan on to steel plate used in the cup machine to ensure the flatness tolerance more high surface finish and lower.The thickness of the steel plate has better flexibility, so scraping to ensure clean degree, but the manufacturing precision and the substrate support sheet

7、 on the surface of substrate for tolerance not required, the ink will leak in the process of oil cup and sliding plate. Another factor is the manufacturing precision of the oil cup sliding guide shaft, such as surface roughness and tolerances, reflected in the assembly and level of index, measuremen

8、t of parallelism between the shaft and the guide plate to control is very important. From this point of view, thick plate oil cup pad printing machine manufacturing more difficult. Resin plateResin plateResin plate with nylon photosensitive plastic, casting in zinc plate surface, similar to the resi

9、n version of self-adhesive trademarks used above. Nylon has very good abrasion resistance, and it can be used for repeated friction of oil cup or scraper after photosensitive solidification. The advantage of using resin plates is that it is easy to obtain extremely fine dots, and the resin version i

10、s the first choice when printing small and exquisite articles. If the manufacture of cup printing machine reflects the manufacturing level of an enterprise, so manufacturing printing machines use resin version will be more difficult, after all, belongs to the nylon photosensitive emulsion polymer ma

11、terial, when its supporting substrate manufacturing precision, pad printing from general printing complete is not easy. The surface state of polymer materials is very fine, and slight defects will seriously affect the quality of printing.printing inkPrinting ink is still in the solvent ink, printing

12、 ink for screen printing inks have been replaced, the effect is very good, most of the manufacturers of ink printing ink and printing ink as a series of production. But screen printing ink used in pad printing process will also have a lot of problems. In contrast, the special pad printing ink drying

13、 faster and more stable, thixotropy better. The ink layer of pad printing process is relatively thin, and some want to get more eye-catching handwriting, ink pigment purity is higher, fineness is finer, these are the difficulties of manufacturing pad printing ink. In addition, a dedicated pad printi

14、ng ink (ink is very few, the domestic production of recent development, very rapid prominent Zhongshan Zhongyi Ink Co. Ltd., Hangzhou kuvan Ink Co. Ltd., Shenzhen Miramar Ink Co. Ltd.)Types of pad printing ink:Ink specially used for pad printing is different from general solvent based ink, water-bas

15、ed ink and UV curable screen printing ink. Although pad printing ink and screen printing ink have some similar characteristics, but they are still very different. Different from screen printing ink, pad printing ink drying speed is faster, and this is also the most outstanding characteristics of pad

16、 printing ink. Simultaneous,Pad printing ink is often printed on the film, the use of 1 transfer printing ink is easily affected by some factors, such as temperature, humidity and static. Prepared specifically for printing ink including single component ink, two-component ink, dry type, oxidation an

17、d sublimation inks etc. 11) one component inkOne component ink (also known as solvent volatile ink) drying by solvent evaporation, this ink does not necessarily have to add catalyst. There are two types of single component ink: glossy and non glossy. They are mainly used for printing of plastic subs

18、trates.2) two-component inkTwo component ink is also called chemical reaction ink, 1 must be added before printing, catalyst and ink in the resin reaction, through polymerization to achieve the purpose of ink drying. It is necessary to add a certain amount of catalyst when printing with two-componen

19、t ink in pad printing, usually measured by weight. The addition ratio of catalyst must be strictly controlled, too much will greatly shorten the adaptation period of ink; the addition of too little may lead to the ink drying in the best drying performance. In general, if the ink and catalyst deploym

20、ent ratio is improper, will lead to ink adhesion uneven and printing image durability is not enough and other printing defects.3) a type of inkDry ink is divided into two types: one is the standard of two-component ink based on the addition of the catalyst; the other one is for the deployment of spe

21、cial glass, ceramic and metal substrate ink. As its name suggests, a type of ink must be heated and dried at a certain temperature. When using this ink to calculate the drying time, the higher the temperature is, the shorter the drying time, but the drying temperature is too high will make the ink f

22、ilm brittle, so be able to maintain in the flexible temperature dry ink ink.4) oxidized inkOxidation ink absorbs oxygen in the surrounding environment to polymerize to form ink film without adding catalyst. Typical applications of oxidation inks are soft packing substrates and synthetic materials, s

23、uch as rubber products or keyboards. Due to the slow drying speed and long time of oxidation printing ink, the use of the ink is limited.5) sublimation inkSublimation inks need special processing in the use process, is going to heat after printing on the substrate that exhibits a porous, so that whe

24、n the dye contact to the substrate surface heating, ink dyes into gas, and then into the surface of the substrate, the substrate surface actually changed color the. Once the substrate cools, the ink sticks to the surface of the substrate. Sublimation ink is the most common application of computer ke

25、yboard printing, as well as those of oil resistance, abrasion resistance requirements of printed matter, and this is the use of two-component ink can not be achieved. In particular, the problem is that sublimation ink is actually changed the substrate surface color, so the matching between substrate

26、 and ink color is more difficult. Therefore, the color of the substrate must be lighter than the color needed for the final printing, because sublimation ink in the color of the substrate surface color change is often not obvious.6) special inks and auxiliariesSpecial printing ink including edible i

27、nk, ink, ink silicone resin lubrication and corrosion resistance of conductive ink and UV ink, UV curable ink, ink stick and the ability of these rapidly will decide whether effectively to transfer ink to the substrate surface. At the same time, in order to adjust the printability and performance of

28、 ink, besides the addition of solvents and catalysts, there may be many additives, such as viscosity ink, antistatic agent, rheological agent, etc. But the use of additives will have a great impact on ink printing performance, must be careful when using.Metallic printing ink refers to inks made from

29、 metallic pigments, such as gold ink and silver ink.Metal ink is a kind of ink with unique metallic shining effect, which is made of small metal sheet instead of pigment or dye in traditional ink.Metal ink is often referred to as silver ink and gold ink. Silver ink made of aluminum pigments prepared

30、 by copper; gold ink pigment and pigment of zinc in different proportion, through controlling and changing the ratio of them can produce green gold, green and red gold, gold ink or Pantone metal inks needed.Characteristics of metallic inkThe characteristics of metallic ink will be described from thr

31、ee aspects of optical, mechanical and chemical properties.1. optical properties(1) the difference of optical characteristics between ordinary ink and ordinary inkBecause the optical properties of metallic pigments are different from those of ordinary pigments, the optical properties of the metallic

32、inks produced are quite different from those of ordinary inks. The color of ordinary ink will not change with the observation angle, but for the metal ink, observation angle changes will change the hue and brightness of the metal ink.(2) the factors affecting the optical properties of metallic inkTh

33、e effect of metallic ink is the result of the interaction of specular reflection and diffuse reflection of metallic pigments. In order to achieve better metal effect, the specular reflection of metallic pigments should be improved and the diffuse reflection should be reduced. The main factors affect

34、ing the optical properties of ink are as follows.The bigger the size of metal pigment, the better the mirror reflection effect of single pigment particles, the higher the metal gloss of metal ink, but its hiding power and dot reproducibility will be worse. The smaller the size of metal pigment is, t

35、he better the covering power and dot reappearance of metal ink are, but because of excessive edge diffuse reflection, the metal glossiness of metal ink will decrease. Users can choose the appropriate size according to their own requirements, but the choice should be combined with specific printing m

36、ethods. Different printing methods need to use different metal pigment diameter of metal ink, otherwise it will appear because of the size is too large, in the printing process can not smooth ink, or the particle size is too small, the printing effect is not good.The particle size distribution of me

37、tallic pigments is also a factor affecting the optical properties of metallic inks. We usually say the metal ink particle size generally refers to the average particle size of D50 metal pigment in the ink, such as 10 m metal ink, refers to the detection of 50% pigment particle size less than 10 mu m

38、, in fact, this indicator is not very accurate, the quality of the performance of metal ink.The traditional metal pigment particles in metal printing ink of the shape is irregular, called cornflakes (corn granular, see Figure 1), because each metal pigment particles of irregular shape and the edge i

39、s not smooth, resulting in the effect of specular reflection particles, edge reflectance is serious, so the metallic luster metallic ink and hiding power the corresponding difference. The latest condensation and grinding technology to produce new silver dollars using the card company (Yin Yuanxing,

40、figure 2) metallic pigment. Each particle of this metal pigment is nearly circular structure, uniform size, mirror reflection effect is good, the ink produced by it metal effect and hiding power is excellent. Therefore, this new type of metal pigment has been widely applied since it was introduced.M

41、any users will find that when you use different metal ink manufacturers, although they display technical information on the size of the same size, but after printing ink for metal covering and metal gloss sometimes will be very different, this is because different manufacturers of metal metal ink pi

42、gment particle size distribution with a narrow width. The same mean diameter, particle size distribution is narrow, the overall arrangement of the paint more neatly, produced metal ink gloss and opacity is better, therefore, the analysis of particle size distribution characterization and quality con

43、trol of metal pigment is very important, but also an important embodiment of students of different metal pigment manufacturers technical level.2. mechanical characteristicsThe metal material used in the production of metal inks are sheet metal is soft and thin, very sensitive to shear stress, shear

44、stress is too high will cause the metal pigment particles deformation or formation of many fine particles, the optical properties of the final products decreased,Figure 3 shows the effect of shear force on metal pigment particles. So you need to use some smoother material to stir, and to avoid high-

45、speed mixing. It should be emphasized that many printing mills are accustomed to using some edge hard metal tools to stir ink, which is very undesirable.3. chemical propertiesAs used in the manufacture of metal ink materials are metal material and lively, so the chemical properties of metallic ink i

46、s very unstable, use and storage must be strictly sealed, avoid excessive moisture absorption and long time of direct light. Recycled metal ink is not suitable for storage too long.Advantages of metal inkIn order to achieve a good metal luster, the content of metal pigment in metal ink is 24 times a

47、s much as that in ordinary ink, so the price of metal ink is higher than that of ordinary ink. Nevertheless, because of its unique expressive force can enhance the competitiveness of products, attract more consumers attention, metal ink printing has been welcomed by the packaging printing industry.

48、Metal ink printing has many advantages compared with the process of hot stamping and aluminum film printing which can also achieve the effect of metal.(1) it is convenient to use, does not need to transform the equipment, and does not need more investment.(2) it can be printed like ordinary ink, and the production efficiency is improved.(3