The main printing equipment in the process of processing refers to the printing machine. With the printing machine, the printing speed and efficiency of the printing enterprise will be greatly improved. We only know that books, newspapers and magazines are printed, but they do not know. The structure and function of the press.
As a mature printing equipment, the printing machine mainly includes a printing head system, a rail conveying system, a steel mesh clamping system, a cleaning mechanism, and a computer control system. Its main function is to use the stencil of the hole to cover the surface of the PCB soldering plate well, to ensure the excellent connection between the reflow furnace device and the welding plate, and to smoothly and smoothly after the operation.
If you want to carry out the printing equipment process, you will find the same raw material - solder paste, which is a paste composed of alloy solder paste powder, paste flux and trace additives, is a uniform and stable mixture. Flux as a medium is also essential in the printing process of the printing equipment. It can remove oxides on the surface of the substrate, prevent the solder paste powder from being oxidized during reflow, and reduce the tension on the surface of the solder paste to form a more effective one. Solder joints.
The main step of the printing equipment process is to warm the solder paste before it is taken out. After the temperature is over, when the solder paste is ready for use, the solder paste is used to stir the solder paste. Sometimes it can be stirred. Manual mixing, machine agitation, it will be faster, but also can quickly reach the usable state of the solder paste process, the biggest feature is that the machine is more delicate solder paste, higher adhesion. The most obvious disadvantage of manual mixing is that it is inefficient, time-consuming and labor-intensive, and labor-intensive.
The total time for processing the solder paste should not exceed 48 hours. If it exceeds 48 hours, it is a waste product and must be disposed of. Then put the stirred solder paste on the steel mesh, the operation process should follow the principle of “small number of timesâ€, try to avoid the oxidation of the solder paste by air, so that the adhesion changes. The time for the solder paste to stay on the steel mesh should not exceed 8 hours. If the solder paste sticks to the edge of the steel mesh, it is necessary to put the solder paste in the middle in time, and remember to clean it once every half an hour. The printed circuit board of the printed number is placed in a reflow oven for process production within half an hour. This is the process flow of the complete printing equipment.
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