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    Transfer Printing Film

    Article source: popularity: Published time:2016-03-25 14:07:44
    Thermal transfer spent film structure
    Thermal transfer spent film refers to graphics with an adhesive in the joint action of heat and pressure, together with the release layer from the carrier film together, firmly transferred onto the substrate surface of the special function printed film.
    Thermal transfer film generally composed of three to five layers. Thermal transfer film consists of three base layer, printed layer and Adhesive layer; four thermal transfer film from the base layer, the release layer, printed layer and Adhesive layer; five thermal transfer film by the base layer, release layer, printed layer, and the layer adhesive hot melt adhesive powder layer.
    Four thermal transfer film structure, with the following four layers of the transfer film as an example of the requirements of their role.
    Base layer: the release agent, ink and adhesive coated carrier, requires the support temperature, pressure, stretching small deformation. Release layer: a layer of coating from the type agent, remains in a solid state at room temperature, at a certain temperature can be melted with the adhesion of the base layer becomes small, can quickly be detached from the base layer, no adhesion residue. Release agent is a completion of the printing layer is separated from the base layer to the substrate surface of the transfer key. It requires a good abrasion resistance, protect color ink, lower-intensity ultraviolet radiation, reducing the negative factors in the air attack of the ink, the ink usage period of prolonged action, and can buffer the base film and the printed layer adhesion . Printing layer: This layer is transferred article texture beauty fundamental. With the advances in printing technology, the development of image processing technology, the printed layer having a variety of colors, a variety of patterns. Especially gravure printing graphic obtained can well reflect the delicate illustrations, let the packaging more perfect decorative effect. Adhesive layer: The basic properties of the substrate surface with higher adhesion, ensure that the printing layer and firmly bonded to the substrate surface. The adhesive layer must match with printing materials. Different adhesives, due to the different chemical composition, and adhesion substrates very far. It should be based on different substrates, to select. 2, thermal transfer film production
    Thermal transfer printing film printing before the opening, the first to be carefully analyzed in accordance with the requirements of customers, according to the subsequent printing process steps.
          Preparation of raw materials
    1. Prepare the base film
    Thermal transfer film has a variety of carriers, the most widely used is PET, it has good dimensional stability, even tension, good heat effect, from the type of good. In particular, it has obvious advantages in terms of color tone reproduction of the original. Specifications such as film width, thickness and size requirements of the selected brands by manufacturers. To check the flatness of the film at the same time, whether tube feeding the "bead", "flouncing" and so do not meet the quality requirements.
    2. Prepare the release agent
    Release agent is a kind of release, film-forming and adhesive properties of the low viscosity of the transparent resin, because solvent evaporation faster release agent, so during the coating process, pay attention to control the viscosity, ie control from the solids content of the release agent, solid content is generally controlled at about 23%, if the solid content is less than 19%, thermal transfer film transfer coating release agent after the effect is not ideal. Also note that the transparency of the release agent, or will affect the effectiveness of the printed layer.
    3. Preparation of ink
    Thermal transfer ink belonging to gravure inks, ink drying mainly depends on evaporation of the solvent, and then the base film is determined, depending on the nature and use of printed material or substrate according to the construction requirements for single-select the appropriate ink. Check the fineness of the ink viscosity, hue, color strength and other indicators to see if the print quality of the ink all in compliance with the requirements.
    4. Prepare Adhesive
    Thermal transfer adhesive is hot melt adhesive, a colorless or pale yellow viscous liquid, followed by drying a film, membranous and transparent, the coating from the surface of a good agent and a type of ink has excellent composite prison degree and excellent flexibility, abrasion resistance, resistance to water and acid and other media ability, good weathering performance.
          The coating process considerations
    When the material is prepared, the more we can press for printing. Usually the release layer, printed layer and Adhesive layers coated on the same gravure printing machine.
    1. Unwinding
    Installed in the central base film unwinding from the platen roller and the plate cylinder through the middle, and then through constant tension pull roll into the winding shaft, adjust feeding tension according to the roll diameter, depending on the coating of different materials set different drying temperatures.
    2. The release agent coating
    The first deployment of a good release agent, into the coating bath and stir, turn gravure coating, drying the coated substrate film in the drying apparatus, the drying temperature can be from the type of required temperature or data set provided by the manufacturer. Release agent in the surface of the film substrate curing time is very short, but it is better to make the transfer must be solvent allowed to evaporate completely before preparing coating ink, the drying temperature may be appropriately higher, or 2-4 color group sulfate. Release agent coating thickness control in about 5μm, not too thick or too thin, too thick will easily peeled from the base film release layer is too thin can result when the thermal transfer printing layer can not be completely transferred.
    3. The coating ink
    Thermal transfer printing layer film generally use gravure printing. Well away from the substrate film coated roll type agent through the middle of the platen roller and the plate cylinder, plate cylinder is rotated in the ink tank, a graphic print, and then after drying apparatus after printing the ink drying, drying speed. Thermal transfer ink drying solvent is selected according to the drying temperature, if the solvent toluene belong Quick-drying, the drying temperature can be appropriately reduced; if it is slow dry xylene, the drying temperature should increase the number. Also note that the thermal transfer film printing color printing color sequence order and ships the contrary, that is, first printed transparent ink, then printed ink low transparency and, finally, a layer of white ink printed as needed. Opaque white ink is the role of the color of the substrate to cover itself, so that graphic hue level and transferred to the colored object is not affected.
    4. Adhesive coating layer
    As not to damage the graphic printed layer, Adhesive layer to be carried out in the printing layer is completely dry conditions. Adhesive layer may be a color gravure printing machine last group directly coated substrate film after coating and then drying, drying temperature depending on the decision of the base film, and finally by rolling
    5. Winding and cutting
    Air shaft rolling paper and put the same axis, the winding force of the winding by the winding motor to control the traction roller traction, ships and put the paper at the same tension, so that the normal operation of the machine. When a roll after winding shaft, can be cut after the roll change to another shaft. Thermal transfer film roll in accordance with the requirements of the finished product will be cut to different widths. To save costs, usually by size evenly distributed heat transfer graphics produced on a printing plate, the use of re-cutting. At the same time the most important is the cutting machine must have automatic correction device, otherwise it will affect the overall graphic effect.
    The printing process to be added at any time release agents, inks and adhesives, timely roll film continued to be placed on the paper feed mechanism, to ensure the normal continuous printing. Situation but also regular spot checks coated thermal transfer film of each material, the presence or absence of white spots on the sheets, dirty, streaks and other ills, and immediately removed print fault.
          Development of thermal transfer spent membrane technology
    Our thermal transfer spent film production technology, we experienced from scratch, all imported from abroad to the development process from the domestic production through exports.
    In the 1980's, thermal transfer spent film pattern having a pattern began to flow into the country from abroad, the text pattern similar varieties are universal e-commerce, although it gives a good decorative effect, but they lack individuality, need personalized graphics, we must rely on imports, and expensive media, rarely use the product.
    By the mid-nineties, the country began to follow anodized production production of thermal transfer film to spend, though it can get a certain effect, but failed to better solve the production technology, far less than the foreign thermal transfer spent film quality. Prepress process
    RR Donnelley through the efforts of enterprises, the first in the country to create a new coating formulations, new technology, particularly the release layer and a protective layer merged into one, to be able to replace the role of a one-time release coating layer and protection. This not only reduce the process and shorten the production process inks, increase productivity, reduce costs, and improve the quality of thermal transfer film, thermal breakage of the thermal transfer film, overlapping, scratch resistance, weather resistance and printability nature has been greatly improved, the quality of similar foreign products. Because quality is excellent three-dimensional printing, personalized design services, has been recognized and applied many of the world brand manufacturers, but also by many brand manufacturers out of the country, generally exported to Japan, the United States, Eastern Europe, Southeast Asia, West Asia and other countries and regions.
          New varieties of flower film thermal transfer
    Beginning in the 1990s to the present more than ten years, especially in the past two, three years, security printing, thermal transfer flower varieties of the film is increasing, endless. In addition to the conventional ordinary thermal transfer flower film, thermal transfer foil flower local film, matte thermal transfer flower film, with security and other functions of temperature indicating thermal transfer spent film also has available, one available to get people of all ages.
    Local foil thermal transfer spent film, printing film has obviously spent a metallic luster. Due to the strong metallic luster digital publishing, it can withstand higher temperatures than the foil, and the graphic overlay accuracy, so the application has been rapid.
    Thermal transfer spent film matte surface can be used after a certain roughness of the polyester film as the carrier film (matte film) ink supply, the use of the carrier film was peeled off to leave a protective layer of irregularities, the protective layer on the surface of the light reflected diffusely , thus showing a matte effect. Appears matte thermal transfer spent film solves the problem after the matte surface of existing substrates need to get through the process. This thermal transfer spent film more suitable for the requirements of the entire substrate surface was mute effect varieties, thereby increasing the product is transferred decorative and appreciation, others transfer printing film market increased supplies of new varieties.
          Development Trend of Transfer Printing Film
    Today gluing, our thermal transfer spent film, not only from scratch, from a single species to multiple species, but it is worth mentioning that the proprietary production technology continues to failure analysis and removal, push the spent thermal transfer film production deeper and more difficult to develop, further broaden the scope of use.
          Its characteristics are:
    First, the production technology to a deeper level
    The production method as China patent "one kind of transfer film production methods and their products" provided by the transfer printing film is representative of a conventional thermal transfer spent film production processes based on a deeper level of development. It appears the market has a better thermal transfer spent film of higher quality, and quickly occupied the high-end market of such supplies, in which the transfer film as commodity markets Tupperware daily use of color sequence, Maybelline cosmetics, transfer film brands such as Avon used, are based on the patented technology. Printing and packaging City
    Second, decorated to a higher level of difficulty of development.
    As "a kind of matte and glossy transfer film," the Chinese patent provides a way for different regions of the transfer surface of substrates having different optical structure, so that the surface portion of the substrate was matte, some were light the other is a representative of the thermal transfer spent film market to a higher level in the direction of the decorative transfer film.
    Third, open up the transfer object
    "Surface having decorative pattern metal products" and "an approach the transfer film and the glass surface of the article directly transferred," the patent application is a range of applications of thermal transfer spent film to metal, glass products to promote the new trend transfer . The latter is an energy-saving, environmental protection, high-quality, direct, fast and convenient glass surface decoration new methods. It can be directly transferred to the glass products on gravure printing graphics, printing dot level to solve the small screen printing difficult to achieve, achieve and exquisite. Its graphic contrast surface graphic effects and screen-printed glass decorating is a big leap. This approach allows the baking temperature is as low as less 180 ℃, time of only 10 to 15 minutes, compared with 2 hours for decorating glass ink consumption for prolonged temperature from 450 ~ 600 ℃ baking required ,Greatly reduced. This new approach to glass surface decoration, will give our wine industry, pharmaceutical industry, cosmetics industry to provide a new approach to decoration will bring a big impact of glass manufacturing, effectively solve the manufacturing of glass It has long been plagued by
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