Screen printing process of cosmetic glass bottle packaging material！
One, understand silk screen
Screen printing belongs to stencil printing, which is called the four printing methods together with flat printing, embossing and gravure printing. Hole printing includes transcription, perforated pattern, spray and screen printing, etc. The principle of stencil printing is: the printing plate (the perforations that can pass ink are made on the base of the paper film plate or other plates). When printing, the ink is transferred to the substrate (paper, ceramics, etc.) through the perforations of the stencil under a certain pressure. ) To form an image or text.
During printing, the ink is transferred to the substrate through the mesh of the graphic part through the squeeze of the squeegee, forming the same graphic and text as the original. The screen printing equipment is simple, convenient to operate, simple in printing and plate making, low in cost, and strong in adaptability. The common printed materials with a wide range of screen printing applications include: color oil paintings, posters, business cards, binding covers, commodity signs, and printed and dyed textiles.
Second, the principle of silk screen printing
Screen printing consists of five elements, namely screen printing plate, squeegee, ink, printing table and substrate. The basic principle of screen printing is to use the basic principle that the screen printing plate is printed with ink through the mesh of the graphic part and the non-graphic part of the screen is impermeable. When printing, pour ink on one end of the screen printing plate, and use a squeegee to apply a certain pressure on the ink position on the screen printing plate while moving toward the other end of the screen printing plate. The ink is squeezed from the mesh of the graphic part to the substrate by the squeegee while it is moving. Due to the viscosity of the ink, the imprint is fixed within a certain range. During the printing process, the squeegee is always in line contact with the screen printing plate and the substrate, and the contact line moves with the movement of the squeegee, due to the screen printing plate and the substrate. A certain gap is maintained between them, so that the screen printing plate during printing produces a reaction force against the squeegee through its own tension. This reaction force is called resilience. Due to the effect of resilience, the screen printing plate and the substrate are only in mobile line contact, while other parts of the screen printing plate and the substrate are in a separated state. The ink and the screen are broken to ensure the printing dimensional accuracy and avoid smearing the substrate. When the squeegee is scraped across the entire layout, it is lifted, and the screen printing plate is lifted at the same time, and the ink is gently scraped back to the original position. So far is a printing trip.