The printing method that transfers the graphics and text on the intermediate carrier film to the substrate with corresponding pressure is called transfer. According to the different pressures, the transfer is divided into: thermal transfer, water transfer, air transfer, screen transfer, low temperature transfer and so on. 1. Thermal transfer technology Thermal transfer is a technique for printing patterns on heat-resistant adhesive paper, and printing the patterns on the ink layer on the finished material through heating and pressure. Even for patterns with multiple colors, since the transfer operation is just a process, the customer can shorten the printing pattern operation and reduce the loss of materials (finished products) due to printing errors. With thermal transfer film printing, multi-color patterns can be formed at a time, without the need for color registration, and simple equipment can also print realistic patterns. Thermal transfer equipment is used to decorate aluminum profiles and various metal plates, which can achieve the effect of wood products or marble. The thermal transfer equipment is based on the principle of sublimation. It can quickly transfer the required wood or marble texture to the surface of the aluminum powder coating in 3-5 minutes and can penetrate into the interior of the coating 40-60 Micron. Aluminum transfer production process: First, the thermal transfer film is rolled with a film machine to obtain the required size. The second is to weld the cut transfer film into a workpiece wrapping bag by ultrasonic welding according to the size of the workpiece. The third is to insert the work bag made of transfer film on the packaging platform. The fourth is to place the workpiece covered with the transfer film on the trolley platform of the heat transfer machine, and then put 18 aluminum materials in sequence, connect the two ends of the aluminum material with vacuum taps and lock them, turn on the vacuum switch, and the transfer film is tight Closely attached to aluminum. The trolley automatically sends the aluminum material into the baking furnace. The baking furnace automatically heats up 220 degrees and keeps it warm for 3 minutes. The trolley automatically exits the baking furnace. Fifth, loosen the vacuum tap and take off the workpiece. Sixth, remove the transfer film and check the quality of the workpiece. The lithographic thermal transfer production process, one is to use a film cutter to cut the thermal transfer paper roll to the required size. The second is to attach the thermal transfer paper film to the surface of the workpiece and place it on the flatbed thermal printer. The third is to push the plate to the heating area of ​​the plate heat transfer machine, press the pressure plate switch, the pressure plate presses the heat transfer paper tightly on the workpiece, and heats and keeps warm for one minute. The fourth is to raise the pressure plate, push the workpiece to the piece, remove the transfer film to remove the workpiece and check. Thermal transfer technology is widely used in electrical appliances, daily necessities, building materials decoration, etc. Because of its anti-corrosion, impact resistance, aging resistance, abrasion resistance, fire resistance, and 15 years of outdoor use, it does not change color. Almost all products are produced in this way. For example, if you open the phone case, you can see the dense label with barcode. Many labels are required to be able to withstand the test of time. They will not deform or fade for a long time. They cannot be worn due to contact with solvents. They cannot be deformed or discolored due to high temperature. Inkjet and laser printing technologies cannot be achieved. Water transfer technology Known as a relatively environmentally friendly technology, it is also the latest high-efficiency printing production, which is probably related to his separation from the ink in the printing process. Water transfer uses water pressure and activator to dissolve and transfer the peeling layer on the water transfer carrier film. The basic process is: 1) Film printing: printing various patterns on the polymer film; 2) spray primer : Many materials must be coated with an adhesive, such as metal, ceramics, etc., to transfer different patterns, you must use different background colors, such as wood grain basically use brown, brown, earth yellow, etc., stone pattern basically use white Etc .; 3) Extension of the film: let the film lay flat on the water surface and wait for the film to stretch out; 4) Activation: activate the pattern of the transfer film into the ink state with a special solvent (activator); 5) Transfer: use Water pressure will print the activated pattern on the object to be printed; 6) Washing: Wash the impurities remaining on the printed workpiece with water; 7) Drying: Dry the printed workpiece, the temperature depends on the quality and melting point of the material It depends; 8) Spray topcoat: Spray transparent protective paint to protect the surface of the printed object; 9) Dry: Dry the surface of the object after spraying the topcoat. There are two types of water transfer technology, one is watermark transfer technology, and the other is water overlay transfer technology, the former mainly completes the transfer of text and photo patterns, the latter tends to complete the entire product surface Transfer. Cubic Transfer (Cubic Transfer) uses an aqueous film that dissolves easily in water to carry graphics. 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. The surface of the product is like a spray paint to get a completely different appearance. The overlay transfer technology can overlay color patterns on any shape of the workpiece to solve the problem of three-dimensional product printing for manufacturers. Curved surface coating can also add different grains on the surface of the product, such as leather grain, wood grain, jade grain and marble grain, etc. At the same time, it can also avoid the vacancy that is often seen in general board printing. And in the printing process, because the product surface does not need to be in contact with the printed film, it can avoid damaging the product surface and its integrity.
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