Several special new ink introduction

Several special new types of ink In the printing field, ink is the main material. It not only determines the quality of the printed matter, but also marks an important aspect of the print's innovation and features. With the continuous development of science and technology and people's higher demand for printed products, researchers have continuously developed special inks suitable for different printing fields. Here are some special inks with good development prospects.
I. Biological Ink American scientists have long been working on a protein molecule called bacteriorhodopsin. Natural materials can often demonstrate complex functions that cannot be easily obtained with fabricated materials such as semiconductors. The bacteriorhodopsin is found in a strong purple cell membrane on the body called the "halogen salt bacillus salt" in salt marsh. Illuminating its protein can trigger a photochemical reaction circle. The principle is that the photochemical reaction circle transports protons along the channel surrounding the cell membrane. The purple color of this cell membrane originates from the bacteriorhodopsin component known as the "retina." Acetamic acid in the cell membrane channel binds strongly to the "retina." The dissolved "retina" does not bind with amino acid and is pale yellow.
By alternately irradiating two groups of lasers of different wavelengths onto the protein molecule, the protein molecules can be converted between the purple structure and the yellow structure before and after. It is this habit that has inspired people to study and use bacteriorhodopsin. It can be used as a photosensitive component in a simulated retina, a storage component in a ruthenium-based processing device, or a storage component in an optical calculator. The bacteriorhodopsin film can also change its color in accordance with the conversion of the external electric field. In conventional bacteriorhodopsin, under the influence of different electric fields, a low color change from purple to blue will be formed. However, the bacteriorhodopsin structure produced by certain mutants changes from blue to light yellow under the action of a strong electric field. By sandwiching the protein film in a transparent plate combined with a large number of electrodes, a display plate can be made. By applying appropriate voltages to different parts of the film, it is possible to "write" one page of the document or "place" an image on the display screen.
Like the ink on the paper, the image on the bacteriorhodopsin display can also be seen under normal light. The protein film also offers the advantage of high contrast. Moreover, the color transition time can be accelerated to 200μm. At present, the main difficulty facing the entire development work is the need to consume hundreds of volts of electric field to stimulate its color transformation. Researchers are working hard on a targeted study to obtain a breakthrough in the development of a colorant that is highly sensitive to external electric fields.
2. Electrostatic Toning Ink The materials used in electrostatic image forming technologies such as electrophotography and electrostatic recording are called electrostatically toned inks and have the function of selectively attaching to electrostatic latent images for physical development. In addition, there are methods such as electronic toners, electronic printing inks, and developers.
In practical terms, it is classified into a liquid toner (developer) and a powder toner (developer) corresponding to liquids and solids. The general characteristics required for toning inks are: (1) quality stability at high speeds, long-term use; (2) image quality, especially midtone reproduction; (3) color (multi-color) image reproducibility. For powder toning inks, liquid toning inks and color toning inks, they all have their own required characteristics:
1. Powder toning ink is usually a pigment, dye, etc., toner, resin and other binders and additives mixed into one of the micro-powder, attached to the glass ball, iron powder and other carrier surface, with charge Used under state. The use of powder toning inks mainly involves electrostatic printing, indirect electrophotography, electrostatic recording, and electronic facsimile platemaking and copying, which have attracted widespread attention. New manufacturing methods for powder toning inks are currently under study:
(1) Various necessary ingredients are mixed by a heating roller, a heat roller, and a method such as dissolving to obtain a uniform dispersion, and after cooling, the fine particles are crushed. This is the most common method.
(2) A substance is mixed on a flat plate with a solvent mixed at room temperature to form a film, which is dried and solidified, followed by fine particle grinding. Its disadvantage is that it tends to leave residual solvents and is only suitable for small amounts of production.
(3) Spray dry the mixed dispersion of the preceding paragraph.
(4) The polymerizable monomer, the colorant, and other components are mixed and microparticles are formed after suspension polymerization.
(5) Dissolving the solvent dispersion mixed in the item (2) with a solvent, mixing, and charging a large amount of non-solvent in which the respective components are not dissolved to precipitate as insoluble fine particles.
(6) Dispersions are mixed in a non-solvent state in a dissolving state to disperse them as spherical particles, and the original substance is cooled and solidified, followed by solid-liquid separation.
The powdery toned ink thus obtained generally has the following properties as the main indicator of the evaluation quality:
(1) Chargeability: Charge capacity, polarity, stability, etc.; (2) Graininess: particle shape, maximum (minimum) particle size, particle size distribution; (3) developability: density, paste, ghost, gloss Etc.; (4) Fixability: Melting temperature, solubility, adhesion strength; (5) Image quality: resolution, contrast; (6) Intensity: fatigue phenomenon, powdering.
2. Liquid Toner Ink This is a process in which a dye, a pigment, a toner, a resin, a charge control agent, and the like are dispersed in a highly insulating liquid carrier, and is mainly used for electronic facsimile and has an electrostatic latent image. The dispersion of the surface immersed in the toner is redispersed and diluted in an excess liquid carrier-a liquid developer or the developer is coated on a roller, and the toner ink is selectively attached to the latent image. Then, excess developing ink is removed, and after the liquid carrier is evaporated, the image is fixed on the surface.
Three. Scented ink Scented ink is an ink used in microcapsule printing. Its principle is to add various flavors of flavor to the microcapsule carrier and add it to the ink, thereby forming various flavor inks. The flavor ink fragrance can be directly connected to the ink, printed by letterpress and flat printing, or can be made into microcapsules, then infiltrated into the ink and screen printed.
The composition of the fragrance is very complicated, and the organic components contained therein are volatile and chemically unstable substances. Therefore, during use and storage, it will inevitably volatilize or be degraded. In order to protect the essence from external environmental factors and prolong its release period, it is advisable to microencapsulate the essence, slowly oxidize it after contact with the air, continuously release the aroma and greatly prolong the period of its fragrance protection, and also some flavor microcapsules. Only under the catalysis of ultraviolet radiation, oxygen circulation, heating, humidity changes and other environmental factors can they react with each other to produce aroma substances, so that the printed products can be avoided ineffective under normal circumstances. Flavor microcapsules can be transferred to the appearance of packaging products by formulating inks, coatings, and the like.
IV. Inks with other special functions (1) Thick-film inks are designed to be capable of printing inks and lacquers up to and including 200 μm thick. It is very advantageous that the 100% solid content UV ink is responsible for this. The ink in this area can be said to be the exclusive occupation of UV ink and lacquer. Commodity application examples include frames, localized posters, etc. Another application is the ability to set gaps with ink film thickness.
(2) Touch-sensitive ink refers to the ink that is lubricated by hand and is not easily bumped by satin-gloss ink. Of course, it can also be used as a metallic touch. Designed as an ink with a stretchy elastic coating, examples of products that are suitable for use include packaging, loose-leaf covers, and home appliances, and are widely used.
(3) Mirror ink refers to metal ink that can be printed as a mirror-like bright print. Using a metal material that takes a lot of time in shape, it is precisely oriented to design the ink. Uses include paneling, simple mirrors, and flower boards. Spraying, roller coating, etc. are also being used for painting.
(4) Anti-scratch lacquer is a lusterless, wrinkle-like lacquer that is not easily bumped, has a good feel and feel, and is similar to the tactile ink. This scratch-resistant lacquer is particularly suitable for surface decoration related to the nameplate, such as surface printing for the purpose of matt and wrinkle-free, so that it maintains considerable resistance and physical properties. And with its features that are not afraid of bumps, etc., it solves the problem of reducing the cost without requiring a protective layer. According to use, it can be divided into solvent type one liquid, two liquid and UV type. In terms of products, there are surface treatments such as packaging and vehicle nameplates.
(5) The antibacterial ink can play a role in removing fines or inhibiting its growth. Whether solvent-based, UV-based, or water-based, the antibacterial ink can be imparted with antibacterial properties through the blending technology of antibacterial raw materials and ink components. This has caused The attention of the relevant departments has been applied to the printing of most items for public use such as anti-bacterial goods, hospital equipment items, appliances, and writing supplies.
(6) Sublimation printing ink refers to a phenomenon in which solids are directly vaporized without a liquid state after being heated, and then solidified after cooling. Such materials as dry ice, camphor, etc., many dyes also have sublimation, such as disperse dyes containing monoazo dyes (yellow turns red), green onion (cyanosis) dyes and so on. Has been applied to cloth, plastic molding and other printing.
(7) Tide-induced solidification ink This kind of ink is printed on the substrate. Under the action of water vapor, the resin binder in the ink is precipitated and precipitated, and the ink film is fixed and dried. The linking material is a high acid maleic acid resin, fumaric acid resin, etc. The solvent is glycol. The ink has a fast drying speed and no odor. It is used for printing on photosensitive resin plates and flexographic printing. The ink film is resistant to wax coating process and is therefore also commonly used in food packaging and printing.