The working cycle program of flat screen printing machine is based on flat screen platform monochromatic semi-automatic hand screen printing machine. One of its working cycle is: feeding → positioning → plate falling → lower scraping plate, up returning plate → scraping stroke → up scraping plate → down returning plate → plate lifting → ink returning stroke → release positioning → receiving piece.
In the continuous cycle action, as long as the function can be realized, the time occupied by each action should be as short as possible to shorten the same period of each working cycle and improve the working efficiency.
Imprint line. In the printing process, the ink scraper plate squeezes the ink and the screen printing plate, so that the screen printing plate and the substrate form a contact line, which is called the embossing line. This line is at the edge of the scraping board, and numerous imprinting lines form the printing surface. It is very difficult to achieve the ideal imprinting line, because the printing process is a dynamic process.
Screen printing machine working principle. Taking the commonly used hand screen plane screen printing machine as an example, the working principle of the screen printing machine can be described as follows: the power is transmitted through the transmission mechanism, so that the scraper plate compresses the ink and the screen printing plate in the movement, so that the screen printing plate and the substrate form an imprinting line. Because the screen has tension N1 and N2, the force F2 is generated on the scraper plate, and the resilience makes the screen printing plate not bear the imprinting line except for the imprinting line The ink is in contact with the substrate. Under the squeeze pressure F1 of the ink scraper, the ink is leaked from the moving imprinting line to the substrate through the mesh.
In the printing process, the screen printing plate and the scraper plate move relative to each other, and the extrusion pressure F1 and the rebound force F2 also move synchronously. Under the rebound force, the screen returns to contact with the substrate in time, so as not to rub the imprint dirty. That is, the screen in the printing process, constantly in the deformation and rebound.
After one-way printing, the scraping board is separated from the substrate together with the screen printing plate, and at the same time, the return ink is returned, that is, a printing cycle is completed. The distance between the upper part of the back ink substrate and the reverse side of the screen printing plate is called the same plate distance or screen distance, generally 2-5mm. In manual printing, the skill and proficiency of the operator directly affect the formation of the embossing line. In practice, the silk screen printing workers have accumulated a lot of valuable experience, which can be summed up as six points, namely, to ensure the straightness, uniform speed, equal angle, pressure equalizing piece, centricity and verticality of the scraping plate movement. That is to say, during printing, the ink scraper should move forward in a straight line and not shake left and right; it should not move forward slowly and then fast; it should not move forward quickly and then slowly or suddenly; the tilt angle of the ink scraper should be kept unchanged, especially to overcome the common problem of the gradual increase of the tilt angle; the printing pressure should be kept uniform; the distance between the ink scraper and the inner sides of the screen frame should be kept equal; the distance between the ink scraper and the frame should be kept vertical
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