Working Principle Of Screen Printing Machine

2022-12-02

1. The work cycle program of flat screen flat screen printing machine takes flat screen flat platform monochrome semi-automatic hand screen printing machine as an example. One of its work cycles is: feeding → positioning → plate dropping → lowering the ink scraping plate, lifting the ink returning plate → ink scraping stroke → lifting the ink scraping plate → lowering the ink returning plate → plate lifting → ink returning stroke → removing the positioning → receiving.

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 synchronization of each work cycle and improve the work efficiency.

2. Imprint line. During the printing process, the ink scraper squeezes the ink and screen plate to form a contact line between the screen plate and the substrate, which is called the embossing line. This line is at the edge of the doctor blade, and countless embossing lines form the printing surface. It is difficult to realize the ideal embossing line because the printing process is a dynamic process.

3. Working principle of screen printing machine. 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 drive mechanism transmits power to let the ink scraper squeeze the ink and screen printing plate in motion, so that the screen printing plate and the substrate form an imprint line. Because the screen has tension, it exerts force on the ink scraper. The resilience makes the screen printing plate not contact the substrate except the imprint line. The ink is squeezed by the ink scraper, Through the mesh, from the moving embossing line to the substrate.

During the printing process, the screen printing plate and the ink scraper move relative to each other, and the extrusion force and rebound force also move synchronously. Under the rebound force, the screen returns in time to be out of contact with the substrate, so as to avoid rubbing the print. That is, the screen is constantly being deformed and rebounded during the printing process.

After the one-way printing is completed, the ink scraper and the screen printing plate are separated from the substrate, and the ink return is performed at the same time, which completes a printing cycle. The distance between the upper part of the substrate and the reverse side of the screen printing plate after inking is called the same plate distance or screen distance, which should generally be 2-5mm. In manual printing, the skill and proficiency of the operator directly affect the formation of the embossing line. In practice, silk screen printing workers have accumulated a lot of valuable experience, which can be specifically summarized as six points, namely, to ensure the straightness, uniform speed, equiangular, pressure equalizing parts, centricity and perpendicularity in the movement of the ink scraper. That is to say, when printing, the ink scraper should move forward in a straight line without shaking from left to right; It is not allowed to be slow in front and fast in back, fast in front and slow in back or slow and fast in turn; The inclined angle to the inkboard shall remain unchanged, and special attention shall be paid to overcoming the common problem that the inclined angle gradually increases; The printing pressure shall be uniform; Keep the distance between the doctor blade and the inner side of the screen frame equal.

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