Color registration in screen printing

My personal understanding of "skill" is that practice makes perfect. Accurate color registration is the result of comprehensive factors. For example, choosing suitable mesh and maintaining uniform tension play an important role in the accuracy of multi-color overprinter; Positioning and operational capability II

Both of them are directly related to the accuracy of overprinter; The edge of the substrate is required to be cut neatly and straightly to facilitate the overprinter of screen printing, which is the key to accurate overprinter. When operating, the capacity of the scraper is too large or too small, which will cause misregister of the substrate. because

In manual screen printing, the capacity of scraper should be uniform, the speed should be moderate and the capacity should be free, so as to achieve accurate overprinter effect.

For small-batch, multi-color clothing or cutting printing, another way is "digital direct printing" instead of thermal transfer printing. If the thermal transfer is transferred to the clothing fabric by means of the adhesive coating on the transfer paper, then

Digital direct injection is to spray ink directly on the fabric, and then the ink diffuses qualitatively at high temperature and high pressure, and then it is blended into cotton fiber. Ink is liquid, and there is no smoke. Low water and energy loss, no need for dust removal and other purification equipment, so

The first advantage of digital direct injection is soft touch and low follow-up cost; Because there is no need for plate making, it has a relative cost advantage in small batch production, especially suitable for personalized products and customized production.

Although digital direct jet printing is the most advanced printing technology at present, it is not a panacea that everyone expects to solve any printing problems, let alone a large-scale product solution. As mentioned above, digital direct injection melts ink into cotton fiber instead of forming a new chemical bond with cotton fiber, so this involves a problem of washing fastness; If you have painted a picture, you will know that the principle of "coloring" of paint is not that the paint itself can be firmly combined with the medium, but that it is fixed on the surface of the medium with the help of a synthetic resin that can form a strong film. The original T-shirt clothing printing was similar to paint. T-shirt printing belongs to pigment printing, and the pigment itself is a granular semi-solution; At the same time, in order to make the printing pattern not crack, the ink is required to have equal viscosity, especially when printing dark fabrics, which requires the printing machine not to block the nozzle frequently; The second is the printing speed.

Make a simple table and compare the printing process of three printing methods!