Thermal transfer and water transfer technology and application
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A printing method in which the image on the intermediate carrier film is transferred to the substrate using a corresponding pressure, referred to as transfer. According to the different pressures used, the transfer is divided into: thermal transfer, water transfer, gas transfer, screen transfer, low temperature transfer, and the like.
1. Thermal transfer technology
Thermal transfer is a technique in which a pattern is printed on a heat-resistant adhesive tape, and a pattern of the ink layer is printed on the finished material by heating and pressurizing. Even with a multi-color pattern, since the transfer operation is only a process, the customer can shorten the printing pattern operation and reduce the loss of material (finished product) due to printing errors. Using thermal transfer film printing, multi-color patterns can be imaged at once, without the need for color registration, and simple devices can print realistic patterns.
The thermal transfer equipment is used to decorate aluminum profiles and various metal plates to achieve the effect of wood or marble. The thermal transfer equipment works according to the principle of thermal sublimation. It can quickly transfer the required wood grain or marble grain to the surface of the aluminum powder coating and penetrate into the interior of the coating in 3-5 minutes. Micron. Aluminum transfer production process: First, the film is used to wind the thermal transfer film to the required size. Second, the cut transfer film is ultrasonically welded into a workpiece wrapping bag according to the size of the workpiece by a transfer ultrasonic packaging machine. The third is to insert a workpiece wrapping bag made of a transfer film on the packaging platform. The fourth is to place the workpiece wrapped with the transfer film on the platform of the heat transfer machine, and then place 18 aluminum materials in turn, connect the ends of the aluminum to the vacuum taps and lock them, and open the vacuum switch. At this time, the transfer film is tight. Close to the aluminum. The car automatically sends the aluminum material to the baking oven. The baking oven automatically heats up 220 degrees and keeps it for 3 minutes. The car automatically exits the baking oven. The fifth is to loosen the vacuum tap and remove the workpiece. The sixth is to remove the transfer film and check the quality of the workpiece.
The lithographic thermal transfer production process uses a film cutter to cut the thermal transfer paper roll into a desired size. The second is to attach the thermal transfer paper film to the surface of the workpiece and place it on the flat hot stamping machine. The third is to push the plate to the heating zone of the flat heat transfer machine, press the pressure plate switch, press the plate to press the thermal transfer paper tightly on the workpiece, heat and keep it for one minute. The fourth is to raise the pressure plate, push the workpiece to the piece, remove the transfer film and remove the workpiece and check.
Thermal transfer technology is widely used in electrical appliances, daily necessities, building materials and so on. Due to its resistance to corrosion, impact, aging, abrasion, fire, and non-discoloration for 15 years in outdoor use, almost all products are produced in this way. For example, when you open the phone case, you can see the dense barcode label inside. Many label requirements can stand the test of time, no deformation for a long time, no fading, no wear due to contact with solvents, no discoloration due to high temperature, etc. Therefore, it is necessary to use a special material printing medium and printing materials to ensure these characteristics, generally Inkjet and laser printing technologies are not available.
2. Water transfer technology
Known as the more environmentally friendly technology, it is also the latest high-efficiency printing production, probably related to his departure from the ink in the printing process. Water transfer uses water pressure and activator to dissolve and transfer the release layer on the water transfer carrier film. The basic flow is: a) film printing: printing various patterns on the polymer film; b) spraying primer : Many materials must be coated with a layer of adhesive, such as metal, ceramics, etc. If you want to transfer different patterns, you must use different background colors, such as wood, brown, brown, earthy, etc. Etc.; 3) extension of the film: let the film lay flat on the water surface, and wait for the film to stretch flat; 4) activation: activate the pattern of the transfer film into an ink state with a special solvent (activator); The water pressure will be printed on the printed matter after the activated pattern; (6) Washing: the impurities remaining on the printed workpiece are washed with water; (7) Drying: the workpiece to be printed is dried, and the temperature depends on the quality and melting point of the material. (8) Spray topcoat: spray a transparent protective paint to protect the surface of the printed object; IX) Drying: Dry the surface of the surface after spraying the topcoat.
There are two types of water transfer printing technology, one is watermark transfer technology, the other is water drape transfer technology, the former mainly completes the transfer of text and photo patterns, while the latter tends to complete the entire product surface. Transfer. Coating transfer technology (Cubic Transfer) uses a water-based film that is easily dissolved in water to carry the image. Due to the excellent tension of the water-coated film, it is easy to wrap around the surface of the product to form a graphic layer, and the surface of the product has a completely different appearance as a paint. Draper transfer technology can apply color patterns on workpieces of any shape, solving the problem of stereo product printing for manufacturers. The surface coating can also add different lines on the surface of the product, such as skin texture, wood grain, jadeite pattern and marble pattern, etc., and also avoid the virtual position commonly seen in general board surface printing. In the printing process, since the surface of the product does not need to be in contact with the printed film, damage to the surface and integrity of the product can be avoided.