1、高新科技含量特种油墨的特性及用途（Special ink properties and applications of high and new technology）Special ink properties and applications of high and new technology3-15With the continuous improvement of the quality of printing, higher requirements for inks are also presented. In todays rapid development of scienc
2、e and technology, all kinds of printing ink appear constantly, applied to ordinary printing, special printing, security printing, and other fields, they are not only excellent print quality, and also to comply with such as environmental protection, security and other special needs. Therefore, the em
3、ergence of such as magnetic ink, fluorescent ink, photoelectric change ink, temperature change ink and so on, make the printing industry leap to new heights. This paper introduces the characteristics and USES of several kinds of special ink in high and new technology.Nano ink(1) to start with the fi
4、neness and purity of inkWe know that the fineness and purity of ink have a great influence on print quality. To print high quality products, must have fine, pure and high ink to guarantee. Ink fineness is refers to the ink pigment (including filling material) of the size of the particles and pigment
5、s, filling material distribution uniformity in the link of material, it is reflected in the print quality, and also affect the rate of resistance to printing plate. Technology practice shows that the color printing products with anilox printing or field layout contains small Yin, Yin line, printing
6、process easy paste version, space infection, quality problems, such as not seriously to check and analysis, may be in operation error, thought consistency discomfort, ink viscosity is too large, the ink volume is too big or too much pressure and blindly make some wrong adjustment. But it was caused
7、by poor ink fineness. The fineness of the ink is directly related to the quality of the pigment and filling material and the size of the granulation. In general, inks made from inorganic pigments (excluding carbon black) are coarser. This has a lot to do with the rolling process of the ink. Ink in t
8、he process of rolling grinding the more the number of times, it is appear evenly, the greater the pigment particles and link interface, ink particles is fine, the printing performance is also better, more stable. Printing version checker, for example, the columns of the high-profile and intermediate
9、 1-4 into outlets, there, if the area ratio of ink particles and idea is relatively close, easy to make site empty or spread out fluff, appear even ideas not smooth printing. Therefore, the higher the ink, the more clear and powerful the dots on the printed matter.Low fineness of the ink, pigment, c
10、oarse particles, friction coefficient is big, in the process of printing plate printing resistance rate is low, when printing also prone to paste version and JiMo phenomenon, and the situation of the uneven ink, the ink transfer. The quality of the ink can be judged by the naked eye, i.e. the surfac
11、e that is scratched by the ink knife, such as smooth and uniform visual effect, indicates that the ink is fine. If the surface of the scraped surface appears small or granular rough layer, then the inks fineness difference. In addition, it can also be used to coat the paper with a few ink layers, an
12、d then rub the ink layer with another piece of paper. The ink layer is still very smooth when it is towed to a thin layer, which means that the ink is fine. If there are traces of ink, it is clear that the trace is caused by the ink pigment and the coarse granules of the filling material. Of course,
13、 the above is only based on the experience judgment, the accuracy of the discriminant has certain limitation.In order to realize the normalization and dataing, the fineness of the ink can be detected accurately by relying on the fineness instrument to measure the size of pigment particles. Way is: d
14、iluting the sample ink to a certain extent, in the deepest part of the fineness of instrument and then move to treat grooves with scraper (keep) at a constant speed to the most shallow place, in the grooves on both sides of scale can see ink particle size, also can use a microscope to observe the si
15、ze of the ink pigment particles.(2) characteristics of nano inkNanotechnology is an emerging science and technology. Nanometer is a unit of length, which is 9m 10m. The research object of this technique is mainly nanomaterials. Nanomaterials are now beginning to permeate every field. In 1994, the U.
16、S. -based XMX company successfully patented a nano-scale homogeneous particle used for printing ink. Because the nanoparticles can absorb all of the light waves and make them black, they also have a scattering effect on the light. Therefore, using these characteristics, nano-metal particles can be a
17、dded to black ink to make nano ink ink to improve its purity and density. In addition, the semiconductor nanoparticles are characterized by the presence of significant quantum size effects and surface effects.The study shows that after the surface of nanometer semiconductor particle is chemically mo
18、dified, the media around the particle can strongly influence its optical properties, and the absorption spectrum can be red shifted or blue shift. The experimental results show that the light absorption of the CDS nanoparticles has a significant blue shift, while the absorption edge of tio2 nanopart
19、icles has a large redshift. Accordingly, if they are added to yellow and blue ink to make nano-ink, they can improve their purity. By using nano-inks that have been added to specific nanoparticles to copy printed color prints, the layers will be richer, the order will be more distinctive, and the pe
20、rformance of the image details will increase.Nowadays, with the aid of high and new technology, various components of ink (such as resin, pigment, filler, etc.) can be made into nano-grade raw materials. In this way, because of its high fine and has a good flow and lubricity, can achieve better disp
21、ersed suspension and stable, less dosage of pigment, covering power is high, good gloss, resin particle size is exquisite, film forming continuous, smooth, thin film, printing image clearer. If used in uv ink, the curing speed can be accelerated and the shrinkage of ink film can be eliminated due to
22、 the fine uniformity of packing. In the inks of glass ceramics, if the inorganic materials are composed of nano-scale fineness, they will be able to save a lot of raw materials and print more accurate and higher quality images. This has brought about a big change in ink manufacturing, making it not
23、dependent on chemical pigments, but instead choosing the appropriate volume of nanoparticles to render different colors. It because some substances at the nanoscale, size is also different, different color or different material, different color is white, such as tio2 and sio2 in nanoparticles cr2o3
24、is green, fe2o3 is brown, and such as the nano al2o3, inorganic nano material has good liquidity, if add to the ink can greatly improve the wear resistance of ink film. The nanoscale carbon ink has the electrical conductivity, which has a good shielding effect on static electricity, and prevents the
25、 telecommunication number from being disturbed by external static electricity.If you add it to ink, you can make conductive inks, such as large-capacity integrated circuits, modern contact panel switches and so on. In addition, such as ag in the conductive ink made of nanoscale and replace the micro
26、n grade ag, can save 50% of the ag powder, this kind of conductive ink can be directly printed on the ceramic and metal, ink film thin and smooth, performance is very good. If cu and ni materials are made of 0.1 mu m 1 mu m of ultrafine particles, it can be substituted for the electricity conduction
27、 of precious metals such as palladium and silver. Therefore, the combination of nanotechnology and anti-counterfeiting technology will open up another wide world of counterfeit ink.In addition, some nanoparticles have their own luminescent groups that may emit light, such as “-n congruent n -“ nanop
28、articles. The printing ink printed with this kind of particle can be recognized by human eye without the exposure of external light source, and can be used for anti-counterfeiting printing. For outdoor large advertising or night reading of graphic prints, foreign light sources are no longer needed,
29、which can save energy and greatly facilitate users.Because of nanometer particles has good surface wettability, their adsorption on ink pigment particles in the surface, can greatly improve the ink oil-wet and wettability, and can guarantee the stability of the ink dispersed system, so nano ink prin
30、ting of the nanoparticles with optimum performance is greater improvement. It is believed that with the further development of nanomaterial technology, more nanomaterials with different characteristics will be recognized and utilized by people.In electrostatic printing, use the magnetic nanometer po
31、wder instead of the widely used now non-magnetic toner, can be added to dispense with in non-magnetic toner ferromagnetic particles as the carrier, and made into single-component copy with the developer, can save raw materials, and can improve the quality of printing.As for the source of nanomateria
32、ls. In fact, for many methods of nanomaterials with high temperature sintering process (such as sintering technology of carbon nanotubes), precipitation, high temperature dissolving method, chemical vapor phase condensation method or modern energy of plasma polymerization.Cationic inkIn recent years
33、, the flexible printing in the light (uv) curing technology in paper and film materials that play an important role in the printing, uv technology is by a narrow web letterpress heading for flexographic printing market. In the offset printing, we also see the advantages of uv ink fast drying system,
34、 which can shorten the printing cycle and reduce the workload. The most important characteristic of uv-curing system is that it can improve the printing stability (drying aspect), shorten the time of printing process and wait for oxidation drying. In the past 10 years, uv printing has been a great s
35、hock to the tradition, mainly printing flexible printing on plastic substrate.Today, there are new inks - cationic ink. It promises to increase the environmental protection and quality of flexible printing. Compared with free radical system, cationic ink has the advantages of low volatility and smal
36、l smell, which is very good environmental ink. The smell of free radical ink is a headache, and it is harmful to the health and environment of the operator. However, cationic ink (low volatility ink) has a great advantage in this area, and can be applied to some food packaging industry. Cationic ink
37、 also benefits from the adhesion of plastic sheets.It is the most important of all the advantages of cationic ink and coating light to show a particularly good adhesion to the chip set.Compared with the free-radical type printing ink, cationic ink has curing speed of medium (the less radical ink), s
38、econdary curing (about extended to 24 hours), prevent oxidation, humidity affects slightly, no shrinkage, plastics with good sexual characteristics.While the free radical ink can be dried at high speed, the curing speed of cationic ink is slightly behind. However, recent research and development ind
39、icates that the improved cationic ink can also be adapted to the printing of 150m/min 200m/min.The advantage of secondary curing is that when printed material is exported from the printing press, the ink film looks as if it has solidified, but there is still a partial reaction (not dry). Cationic cu
40、ring techniques can continue to react until most of the material reacts. In contrast, free radical ink can only be completely dry when exposed to uv light. And this process leads to higher volatility, especially the low molecular weight components that dont react. After curing, the polymer is usuall
41、y high in molecular weight, generally not volatile, and volatile volatiles are also reflected in the extractable components. The content of the extracted ingredients is an increasingly important feature of the test food packaging system. In particular, as an analytical technique, one billionth of th
42、e content can be extracted, and even now it is being discussed as an indicator of the amount of packaging. The shrinkage of cationic ink is small and therefore has good adhesion properties.In the case of green and environmental protection, the packaging printing area is more demanding for environmen
43、tally friendly products. Food packaging should meet cepe standards in industrial standards. In printing ink, to solve the printing ink, such as lead, benzene, aromatic compounds, the content of harmful substances such as ethyl glycol, ensure its safety and printing of food and supplies personnels ph
44、ysical health. Judging from the achievements of the ink industry, the results are encouraging. In 1974, to remove lead from ink pigments; In the late seventies, the removal of the soluble fiber (ethyl glycol); In the early 80s, to remove toluene from food packaging instructions; In the late 1980s, r
45、elated benzidine yellow pigment; In the early 1990s, the use of phthalate plasticizers was reduced. Cationic ink in the development of early stage (the mid - 80), some of these levels did not reach the standard guild regulations, harmful substances such as benzene is the byproduct produced by cation
46、ic ink production, then have the initiator light by-product of is an unwelcome aromatic compounds and so on, these all belong to printing and packaging printing ink of guild regulations listed in the ingredient is prohibited. Therefore, cationic ink can not be widely used at the initial stage. Until
47、 now, some units have adopted a wait-and-see attitude, but after continuous improvement, the contents of these hazardous substances have finally reached the industry standard. Like benzene, in the current production of cationic ink, its content is extremely low, use ordinary analysis technology, can
48、 not detect at all. Many test results for printing and printing environments also show that no benzene exists.The contents of these substances are generally in the range of a few billion (usually a single digit), which indicates that the packaging of the photoinitiator no longer produces benzene. In
49、 view of the development prospect of cationic ink, it is believed that most printing units will still choose the excellent cationic ink. Although some customers still have the intention to give up the use of cationic ink, it has shown great advantages in the printing process, which will inevitably be recognized by customers. We believe that with the development of science and technology and the improvement of printing ink industry, for cationic ink some disadvantages, is bound to find good solution, such as the excellent record as mentioned above. Therefore, we should have a positiv
