DTF is a new digital printing process that has only emerged in the past two years. It is a powerful supplement to the traditional offset heat transfer and lettering film heat transfer processes, and it has or surpasses the traditional offset heat transfer and lettering film heat transfer processes. Its own characteristics and advantages. The industry knows that under the premise of large-volume processing, short construction period and low cost.traditional offset heat transfer has great advantages; under the premise of small customization and pursuit of rich colors and high quality, lettering film heat transfer is compared with traditional offset heat transfer. Type pyrography is directly two levels higher. DTF horizontal contrast lettering film heat transfer not only has the advantages of rich colors and high quality, but also eliminates the steps of engraving and waste disposal, which has great advantages in terms of labor cost and efficiency. Although the efficiency of DTF on a single set of equipment is not as good as that of traditional offset heat transfer, it is far superior to traditional offset heat transfer in terms of investment cost, color and quality. Even compared to the paint squeegee flatbed treadmill direct spray equipment, the color gamut will be wider, the colors will be more vivid, the accuracy will be higher, and it will be more environmentally friendly! If compared with traditional screen printing and offset printing, there are more advantages and fewer disadvantages!
DTF's requirements for image files are higher than those for film printing, thermal transfer printing, and pure cotton sizing and direct printing. The first is resolution and accuracy: Generally, 300dpi is enough for film printing. For high requirements, 450dpi is enough. Thermal transfer printing output paper is generally 100dpi, 150dpi, or a minimum of 72dpi. For high requirements, it is enough. For fine things, 300dpi is completely enough; for direct printing on pure cotton, 200dpi is generally enough, and for high requirements, 300dpi is also enough. These are normal and do not include monochrome block images. Because DTF is a high-quality process, it generally requires a minimum of 200dpi, and normal use is 300dpi. If you want more precise output, you need to use 600dpi, or even 1200dpi. (Of course, the clarity of an image file does not only depend on the resolution of the image. Some images may have a high resolution but not very clear, while some images may not have a very high resolution but are very clear.
Anyone who has done traditional offset heat transfer printing knows that there is a layer of hot melt adhesive powder on the back of the printed heat transfer image, and the edge of the pattern will shrink into a line without adhesive powder. During hot stamping, the hot melt adhesive powder will It melts and sticks to the fabric. After the glue powder liquefies, it will overflow just enough to cover the indented strip. In order not to expose the rubber edge of the translucent printing film for engraving film heat transfer, it is necessary to add a colored edge or a white edge to the pattern. The same is true for DTF. The difference is that the hot melt adhesive powder has been melted on the printing film after heating and drying. In the same way, in order to prevent the glue edge from overflowing when ironing on the fabric, you need to shrink the white ink and hot melt glue of the pattern inward a little. Generally, it needs to be shrunk by 0.1 mm or more. This can be done according to the requirements of the hot pictures. (Of course, if the hot stamping is on white or light-colored fabrics, it does not need to shrink, because generally hot-melt adhesives are milky white and translucent, and there are also black or dark-colored anti-sublimation hot-melt adhesive powders.) Generally, a 300dpi picture will shrink by 1 pixel. A dot is 0.1 mm, 2 pixels at 600dpi are 0.1 mm, and so on, 4 pixels at 1200dpi are 0.1 mm. This is one of the main reasons why DTF has high requirements for image dpi. Especially if there are fine points and thin lines in the picture that need to be hollowed out and hot-printed onto the fabric, the dpi must be 600 or above. The printed picture can better cover the white ink and hot-melt adhesive powder, and the glue edges will not be exposed when hot-stamped onto the clothes.