The application of digital textile printer has brought convenience to people's daily life production. The popularity of digital printing has brought an unprecedented development opportunity for textile printing and dyeing. Let's learn about the precision of digital printing together:
Users of printing machine often pay attention to the printing precision of digital printing equipment, equipment stability, ease of operation, ease of maintenance, adaptability, and cost of use. When it comes to printing precision, people always think of the printing resolution, which is 1440dpi or 720dpi. In fact, this is only part of the printing precision. Printing accuracy will involve many aspects, such as nozzle resolution and mechanical precision (stepping). Accuracy, mechanical accuracy of the shaft roller, matching of ink and nozzle, etc.
1. The nozzle accuracy
At present, the nozzles on the market include piezoelectric nozzles, thermal foaming nozzles, photo nozzles, and industrial nozzles. Among them, the nozzles commonly used for printing are piezoelectric photo nozzles and industrial nozzles, and the piezoelectric photo nozzles are EPSON four generations. The fifth generation head and the sixth generation head are the main products. The fifth generation head is the mainstream product. The high resolution is 1440dpi, which supports 720dpi and 540dpi printing mode. This is also the nozzle used in the printing machine. In addition, some manufacturers choose industrial nozzles, such as the US SPETRA, Japan Ricoh, Japan Kyocera, etc., the industrial head general resolution is about 720dpi. Compared with the EPSON nozzle, the industrial head has a high price, but has a long service life, low resolution and large ink droplets. However, from the perspective of textile printing, the fabric is relatively thick, and the resolution above 720 dpi is visually It is difficult to distinguish. From the point of view of the nozzle, since the nozzle technology is monopolized by a few manufacturers, the printer manufacturers are purchasing from these manufacturers. Therefore, if the precision of the machine printing is selected, the starting point of the nozzle is basically the same.
2. Printer accuracy
The impact of inkjet printer on printing is actually much larger than the resolution of the nozzle, because machining has always been a short board in the domestic processing industry. Generally, the printing machine has a web size of 1600-2200 mm, and the length of the shaft roller generally ranges from 2200 to 2800 mm. Take the Italian MS belt-type direct-injection printing machine as an example, the shaft diameter is 400mm, the length is 2200mm, the comprehensive error of shaft diameter, concentricity and straightness is 0.003mm, that is, the mechanical error of printing one circumference is 0.01mm, processing one The difficulty of such an axis can be imagined. But the same, if a company's product diameter error 0.1mm, then during the printing process, the nozzle may have a cross on one side of the two inkjet joints, and a 0.3mm white line appears on the other side, which is unacceptable to any customer. By analogy, if there is a problem with concentricity and straight digital printing, the consequences are similar. The assembly accuracy is not enough, which is also the main reason that affects the precision of printing machinery. For example, the parallelism is not enough, causing the fabric to run off, the bearing quality is not close, and the wear is inconsistent, which will also affect the parallelism. Servo motors and control systems, in addition to individual small products, generally use the products of international brands in the industry, which has little effect on mechanical precision.
3. The ink
It is generally believed that ink may affect color saturation, color fastness, and amount of coloration, but in fact, ink has a great influence on printing accuracy. Obviously, if the fluency of the ink is not good and there are many mechanical impurities, there may be disconnection and plugging, and small white lines appear in the printing process, which affects the precision of the printing. If there is a problem with the parameters such as viscosity and surface tension of the ink, it may cause oblique spray. Then there is the preservation stability of the ink, the uniformity between the batch and the batch, etc., which are the main reasons for the quality of the printing. Recommended ink here.In summary, we need to obtain a good printing quality, get a good printing accuracy, not only focus on the resolution of the nozzle, mechanical precision, the quality of the optional ink is also very important.