| In the textile, the special color screen printing, in principle, all the ink can be used, even the water-based glue, as long as the outlet is large enough to be printed.  1. Water color spot color dot printing. The use of water-printed spot color dot pattern, generally only white fabric, the effect is better than four-color printing, but the cost is higher, because the plate is more. If a dot pattern is printed on both white and color fabrics, the same screen can be printed with a thermosetting ink and a white fabric.  2. Solvent ink spot color dot printing. Solvent inks are characterized by the fact that they do not require drying and therefore can be resistant to temperature by chemical fiber coated fabrics. The disadvantage is that the hiding power is slightly lower and pollutes the environment.  3. Thermoset ink spot color dot printing. Thermostable textile plastic printing ink (plastisol Ink) is the best ink for textile screen printing. Its characteristics are: a. It does not dry at room temperature, does not harden, so it will not block the net, it can print very fine dots and lines (no matter how high the number of screen lines, as long as the screen version, thermosetting ink is Can be printed); b. strong hiding power; c. 100% solid content, can easily print a thicker ink layer (embossing), compared with foam printing, high fastness, good elasticity, bright colors, angular Neat; d. can carry out wet-to-wet fast printing, greatly improving production efficiency; e. can be used with various textile decorative auxiliary materials such as: glass beads, plastic beads, plastic sheets, metal glitter sheets, light reflective materials, etc. Combined with special effects printing; f. low cost, the price of domestic ink is close to the price of glue, but its coated area is three times that of glue; g. completely environmentally friendly.  Thermosetting textile printing inks are very easy to buy in China. Not only the major thermosetting ink manufacturers in the world have entered the Chinese market, but also many domestic companies have introduced thermosetting inks, and basically all use imported materials. Formulated for production, and the price is also low.  Equipment requirements for textile spot color screen printing  Here we mainly talk about the requirements of equipment for textile and garment printing using thermosetting ink. The equipment is mainly in two categories: printing equipment and drying equipment.  Can the printing platen production line currently used by domestic printing factories be used for thermosetting ink printing? First, it depends on whether the platen surface is subjected to high temperature baking. If it is ordinary glass table top, it can't bear it. Second, is there a plate production line drying car, and is the drying car a far-infrared heat source? If so, it can be used for thermosetting ink printing, but the production efficiency is subject to the printed piece to the drying oven. The effect of the round trip distance to go.  It is best to use a rotary double disc garment printing machine for the production of thermosetting ink printing. Rotary double-disc garment printing machine has manual type, 1/3 semi-automatic type (automatic rotation or automatic squeegee of the plate), 2/3 semi-automatic type (automatic rotation of the plate plate, automatic opening and closing of the screen plate), and more Fully automatic. In recent years, many domestic enterprises have produced and sold. Foreign countries have similar products entering the domestic market. It is often believed that thermosetting ink printing must be cured with far-infrared drying equipment. It is a myth that no matter what method can reach a certain temperature. Curing the thermoset ink. Some manufacturers use the thermosetting ink printing technology, the equipment using the conventional method of heating or low-efficiency far-infrared heating also achieves the effect of hot-melt curing. However, if a high-quality special-effect printing product is printed, there will be a phenomenon of poor fastness and discoloration of the fabric.  Far-infrared rays are rays with a spectrum between 0.75 and 1000 um, which are invisible light. The far-infrared effective area for industrial heating is 2.5-15 um. Its characteristics are: fast heating, strong radiation (high penetration), so far infrared is the best source of baking heat. Within the effective distance of far infrared rays (depending on the power level), not only the thermal efficiency is large, but also penetrates the surface layer of the object and simultaneously heats up within the effective depth. The better the quality of the material using far infrared rays, the higher the efficiency. Thermosetting ink printing, especially special material effect printing, is developed using the advantage of far infrared rays.  The most important thing for the drying equipment used for thermosetting ink printing is the quality of the heating components. The first must be the far-infrared heating components, and the second must be the high-efficiency far-infrared heating components. Far-infrared heating (electrical energy) is mainly in the form of direct heating and side heating. The traditional far-infrared heating components are all side-heating, that is, the heat source is generated by the heating element (heating wire), and then the heat source is generated by the peripheral (circular material) or the far-infrared material of the side (plate material); It is a direct heating type: that is, electric energy directly heats the far-infrared material. It is obvious that direct heat is much more efficient than bypass heat and saves energy.  There is a special instrument for checking far infrared rays, but you can also perform a simple test: wear a thick cotton glove and put your hand in front of the heat-generating material. If the surface of the glove is very hot and the hand has not yet felt the heat, then the material It is not a high-efficiency far-infrared heating component; if the surface of the glove is heated, the hand also feels that the radiation is warming, then the material is a high-efficiency far-infrared heating component.  Temperature control of tunnel-type high-efficiency far-infrared drying ovens for thermoset ink printing is also very important. Its main indicator is the positive and negative temperature difference. If the positive and negative temperature difference is 5 degrees, the absolute temperature difference is 10 degrees. If the target temperature is set to 155 degrees, positive 5 degrees is 160 degrees, negative 5 degrees is 150 degrees, that is, the temperature fluctuates between 150-160 degrees. Of course, the smaller the positive and negative temperature difference, the better the stability of the temperature and the better the working condition. Some foreign companies use liquefied gas far-infrared drying ovens because their temperature is easy to control, and there is basically no positive or negative temperature difference, but the far-infrared rays generated by the liquefied gas heat source are not as strong as the far-infrared rays generated by electric energy. The positive and negative temperature difference of the far-infrared drying furnace generated by electric energy is 3-1 degrees.  The uniformity of temperature in the infrared heat chamber of the tunnel-type high-efficiency far-infrared drying furnace, the discharge of exhaust gas (related to the degree of discoloration of the fabric), and the quality of the conveyor belt are also important. Therefore, the purchase of tunnel-type high-efficiency far-infrared drying oven must be cautious.  Three highs of textile special color screen printing  1. High quality. The fineness of the spot color screen printing and the reduction effect on the image are incomparable to the color block printing. Its bright color and the ability to print on any color fabric are also difficult to achieve with four-color printing.  2. High efficiency. Since the spot color screen printing is basically produced by thermosetting ink, it can be used for efficient production using an automatic printing machine. Even in the 16-color pattern, two workers can print 600-800 pieces in 1 hour. The output of the 2/3 semi-automatic printing machine is close to that of the fully automatic printing machine. Using a hand-rotating double-disc garment printing machine, if there is one worker per swatch and two workers are laying the pieces, the output can reach 300 pieces per hour. Even if a worker operates a double disc garment printing machine with a 6-color pattern, it can produce 200-300 pieces a day. Its production efficiency is also much higher than the glue printing.  3. High profit. In the market, a plastic printed T-shirt (non-brand) retail price is only 10-20 yuan, and a spot color screen printed T-shirt (non-brand), the minimum retail price I see is 45 yuan. The general retail price is around 55-90 yuan. The profit of the two is quite different. In terms of printing processing, the processing fee of the glue printing is generally 0.10-0.25, and the spot color printing is 2.00-5.00 yuan, which shows that the profit of the latter is also quite Considerable.  Textile spot color screen printing technology has been widely used in Europe and the United States, and has been widely adopted in Japan and Southeast Asia. China's Guangdong, Fujian region is affected by the European and American orders and fashion T-shirt domestic sales, the number of companies learning and adopting this technology is also increasing. The clothing printing enterprises in East China are eager to learn and master this technology. For this reason, the upgrading of technical equipment is being prepared. |
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