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From theory to application Analysis of thermal
hour：润湖 time：2011-7-10 views:
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Printer has been in our lives everywhere, such as inkjet printers, laser printers, dot matrix printer so familiar to people, which in many types of printers, thermal printers and dye-sublimation printer is more confusing, the following , Xiao Bian gave you to see how thermal printers and dye-sublimation printer is how the matter? difference between the two in where? so that we can choose to suit your own printer, do not waste money.
Thermal Printers Work
Thermal printer print head works by installing a semiconductor heating element, heating and touch the thermal print head after the paper needed to print out the pattern, the principle and similar thermal fax machines. Image by heating, chemical reaction in the membrane generated. This chemical reaction is carried out under a certain temperature. Higher temperatures will accelerate this chemical reaction. When the temperature is below 60 ℃, the paper needs a rather long, even up to several years to become dark; and when the temperature is 200 ℃, this reflection will be completed within a few microseconds.
Thermal printer selectively determine the location of the thermal paper on the heat, which gave rise to the corresponding graphic. Materials by heating in contact with the thermal print head of a small electric heater provided. Side heater arranged in the form of points or by the printer logic control, when the driver, it generates a paper in the thermal heating elements with the corresponding graphics. Control the heating element of the same logic, also control the feed, which can print on the label or paper graphic.
The most common use of a thermal printer with fixed print head heating dot print head with 320 squares, each point is 0.25mm × 0.25mm. Using this matrix, the printer can print at any point in the position of thermal paper, this technique has been used in paper printers and label printers.
The application of thermal printer
Thermal printing technology was first used in the fax machine, whose basic principle is the printer receives the data signal into the control lattice thermal heating unit, heating the coated thermal paper thermal imaging. At present, the thermal printer in POS terminal systems, banking systems, medical equipment and other fields has been widely used.
Classification of thermal printer
Thermal printer according to the arrangement of the thermal component can be divided into line thermal (Thermal Line Dot System) and column-type thermal (Thermal Serial Dot System). The early part of the column-type thermal products, at present mainly used in some of the print speed is not critical, the country has the author used in their products. Line thermal is a 1990s technology, the printing speed is much faster than the thermal column type, the fastest speed reached 220mm / sec. To achieve high-speed thermal printing, in addition to select high-speed thermal print head, but also there must be co-ordinated with the corresponding control panel.
Advantages and disadvantages of thermal printer
Relative to the dot matrix printer, thermal printing speed, low noise, print clear, easy to use advantages. However, direct thermal printer can not print duplex, print out the documents can not be permanently stored, if the best thermal paper can save ten years. The print can print double-needle, and if a good ribbon, then print documents can be saved for a long time, but the dot matrix printer print slow, noisy, rough print writing, require frequent replacement ribbon. If you need to print the invoice, it is recommended to use stylus printing, other printing other documents, it is recommended to use thermal printing.
Sublimation Printers Work
Dye-sublimation printer works by the four colors (cyan, magenta, yellow and black, referred to as CMYK) of the solid pigment (known as color volume) is set in a drum, this drum above the tens of thousands of installed semiconductor heating elements, heating elements when the temperature rises to a certain extent, you can paint directly into a gas solid (solid-state gas without liquefaction becomes known as the sublimation process, so this is known as dye-sublimation printer printer), then the gas jet to the print media. Each semiconductor heating element can be adjusted out of 256 kinds of temperatures, which can regulate the ratio of color and shades to achieve the true color continuous-tone photo effects. In several types of thermal transfer printers, dye-sublimation printer output the best, but its drawback is that print speed is quite slow, the print media with high requirements, which led directly to increased printing costs.
Dye-sublimation technology is the use of heat to transfer pigment to the print media, the concentration of each color from the print head temperature control, the maximum you can have 256 levels. Because the pigment is applied to the gas phase by sublimation process on paper, so the three primary colors and fusion can form a continuous color scale, ink-jet printing ink droplets than the much better results. Alone printing, the color dye-sublimation printer is the best digital camera partner, so this is often referred to as color printers and digital photo printers, especially for printing on the delicate skin texture portrait requirements, also has the characteristics of long-term preservation is not easy to fade. Yellow, red, blue, which is our daily said the three primary colors, any other color can be blended by these three primary colors, three-color dye-sublimation printer is through the mix to achieve a variety of colors and color depth. However, dye-sublimation printing process, printing three colors is not at the same time, but every time you use a color by three times to form the desired color printing requirements. It is also for this reason, the print media in the printing process, a total of three times to go through the printer, dye-sublimation printer makes printing process is relatively slow, but very high quality photo printing adequate compensate for this shortcoming.
Some three color dye-sublimation printer, the attached membrane and a process. That is, re-use in three colors on special materials on the sublimation ribbon and attach paper to form a protective film, the oxide film can play up color, turn on the water, put the finger and so on. This inkjet printer can not be done. Dye-sublimation printer ribbon is one-time use, paper and ribbon with matching general sale, every roll of ribbon on the yellow, red, blue three colors as a group, each print a photo, it rolled over a set of color band. So, although low-resolution dye-sublimation printers can print, but printing costs are not reduced, only slightly improve the printing speed, the proposed total to the highest resolution print.
The application of dye-sublimation printer
After printing, print images, text used in the latent image left on the ribbon, if you print the contents of the confidential information, it is recommended to save a good ribbon, and destroyed after use. Printer resolution, also known as the output resolution is defined in the print output on both horizontal and vertical directions can be printed per inch maximum number of points, usually the "dots / inch," said the dpi. The so-called maximum resolution refers to the printer can print a maximum resolution, which is called the limit of resolution of printed output. Usually referred to printer resolution generally refers to the maximum printer resolution, the resolution of the current dye-sublimation printers are usually around the 300 × 300dpi. Print resolution is a measure of printer quality, an important indicator, which determines the performance of the printer can print an image of sophistication, its level of output quality has an important impact, so to some extent, will determine the print resolution the printer's output quality. The higher the resolution, which reflected the number of pixels to display the more, can present more information and better and more clear image. But because of the technical characteristics of dye-sublimation printer, although printing the same picture format, resolution is lower than inkjet printers, but printing a continuous gradation of the print, but can be comparable to high-end inkjet photo printer, photo color smooth transition is of the main features of its print.
It is because of the characteristics of dye-sublimation printers are not suitable for printing text, tables and so on. Print time is not a dye-sublimation printer-specific parameters. Laser, inkjet printing speed usually refers to the printer paper printouts per minute, number of pages, in units of PPM said. All printer manufacturers now provide the user a laser or inkjet printer products, logo printing speed to speed as a standard unit of measurement. However, dye-sublimation printer because the printing technology used in laser or inkjet printer with a different, usually less than one per minute, so speed dye-sublimation printer in seconds that the general rate of dye-sublimation printer is about ninety wonderful, first time a little longer, because of the need warm heated print head. Dye-sublimation printer will print in red, yellow, blue three-color film after evaporation followed by heat treatment in a special embossed onto the film, because the current level of the heating heater parts can be divided into 128 or 256, so the heating due to rising vaporization of different pigment concentrations, resulting in color will correspond to a 128 or 256 of the continuous gradation, and this is the concept of the color grade. Three yuan per color or 256 color 128, a total of 2.097 million colors can be generated 16.77 million colors or a continuous gradation, which is almost 16.77 million colors the human eye can distinguish between a color depth of the limit. Current dye-sublimation printers use more 256 color levels.
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