Analysis Of Heat Transfer And Water Transfer Technology Applications

Nov 29-2021

Transfer printing is a method of transferring the image and text on the intermediate carrier film to the substrate by applying corresponding pressure. According to the different pressure, transfer printing is divided into heat transfer, water transfer, gas transfer, screen transfer, low-temperature transfer, etc.

One, heat transfer printing technology

Heat transfer printing is a technique of printing patterns on heat-resistant adhesive paper, and printing patterns on the finished material by heating and pressurizing the ink layer. Even for multi-color patterns, because the transfer is only a process, the customer can shorten the printing pattern operation and reduce the loss of materials (finished products) caused by printing errors. The use of heat transfer pet film printing can be a multi-color pattern into a diagram, with no need for color, simple equipment can also be printed out realistic patterns.

Heat transfer printing equipment for decoration aluminum, various metal plate materials, wood products, or marble effect. Heat transfer printing equipment is based on the principle of thermal sublimation, it can quickly transfer the required wood or marbling to the surface of the aluminum powder coating in 3-5 minutes and can penetrate into the coating interior 40-60 microns. Aluminum transfer production process: one is to use the film machine to roll the heat transfer film to cut the required size. The second is to cut the transfer film with a transfer ultrasonic packaging machine according to the size of the workpiece with ultrasonic welding into the workpiece packaging bag. The third is to insert the work into the package bag made of transfer film on the packaging platform. Fourth, put the workpiece to improve the printing film on the trolley platform of the heat transfer printing machine, in turn, 18 pieces of aluminum can be placed, connect the two ends of the aluminum with vacuum taps and lock it, open the vacuum switch, and then the thermal transfer film is tightly attached to the aluminum. The car will automatically send the aluminum to the oven, the oven will automatically heat up to 220 degrees and hold for 3 minutes, the car will automatically quit the oven. Fifth, loosen the vacuum tap and remove the workpiece. Six is to remove the transfer film and check the workpiece quality.

Lithographic heat transfer production process, one is to use the film cutting machine to cut the heat transfer paper into the required size. The second is the thermal transfer paper membrane attached to the surface and in the plate heat Zhan printing machine. The third is to push the plate to the plate heat transfer machine heating area, press the pressing plate switch, the pressing plate heat transfer paper tightly pressed on the workpiece, heating and heat preservation for one minute. The fourth is to raise the pressure plate, push the workpiece to the section, remove the transfer film that will be under the workpiece, and check.

Heat transfer printing technology is widely used in electrical appliances, daily necessities, building materials decoration, etc. Due to corrosion resistance, impact resistance, aging resistance, abrasion resistance, fire resistance, outdoor use for 15 years no color, almost all goods are made in this way label. For example, open the mobile phone case, the inside can see a dense label with a bar code. A lot of label requirements can withstand the test of time, long-term deformation, not fade, not because of contact with the solvent wear, not because the temperature is high on the deformation of color, so it is necessary to use a special material for printing media and printing materials to ensure these characteristics, general inkjet, laser printing technology is unable to achieve.

Two, water transfer printing technology

Known as the more environmentally friendly technology, is also the most efficient printing production, probably because of its separation from the printing ink process. Water transfer printing USES water pressure and activator to dissolve and transfer the stripping layer on the water transfer carrier film. The basic process is as follows:

  1. Film printing: printing various patterns on the polymer film;

  2. Primer: Many materials must be coated with a layer of adhesive, such as metal, ceramics, etc. To transfer different patterns, different under colors must be used, such as brown, coffee, earthy yellow for wood grain, and white for stone grain.

  3. Membrane extension: let the membrane lie flat on the surface of the water and allow the membrane to extend smoothly;

  4. Activation: a special solvent (activator) is used to activate the pattern of the transfer film into the ink state;

  5. Transfer printing: the use of water pressure to print the activated pattern on the object to be printed;

  6. Washing: Wash the impurities remaining in the printed workpiece with water;

  7. Drying: The printed workpiece shall be dried at a temperature that depends on the quality and melting point of the material;

  8. Finish spray: Spray transparent protective paint to protect the surface of the object to be printed;

  9.  Drying: The surface of the object sprayed with finish paint is dried.

There are two kinds of water transfer technology, one is the water label transfer technology, the other is the water overlay transfer technology, the former is mainly to complete the text and photo pattern transfer technology, the latter is inclined to complete the water based screen printed transfers on the surface of the whole product. Runaway-transfer technology (AwTDC) USES a watery film that is easily soluble in water to accommodate texts and texts. 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, which gives the product a completely different appearance just like painting. Overlay transfer technology can be used to overlay color patterns on any shape of the workpiece to solve the problem of 3d product printing for manufacturers. Curved surfaces can also add different lines on the surface of the product, such as leather, wood, jade, marble, etc., which can also avoid the color of the general board printing often appearing in the virtual position. And in the DTF printing process, because the product surface does not need to contact with the printing film, can avoid damage to the product surface and integrity.

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