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Introduction of Four Printing Methods

Today, we will briefly introduce four common printing methods, which are screen printing, flexographic printing, gravure printing and thermal transfer printing.

Screen printing is a type of stencil printing, which includes transcription, perforated pattern, spray pattern and screen printing. The principle of stencil printing is: during printing, the printing plate transfers the ink through the holes of the stencil to the substrate through a certain pressure to form images or text. During printing, through the extrusion of the squeegee, the ink is transferred to the substrate through the mesh of the graphic part to form the same graphic as the original.

Flexographic printing is a printing method that uses a flexographic plate to transfer ink through an anilox roller. he printing plate generally uses a photosensitive resin plate with a thickness of 1-5mm. Ink is divided into three categories, namely water-based ink, alcohol-soluble ink, UV ink. Because the ink used in flexographic printing is environmentally friendly, it has been widely used in food packaging printing.

Gravure printing is a direct printing method, which directly imprints the ink contained in the gravure pits onto the substrate. The shade level of the printed picture is determined by the size and depth of the pits. The ink content is more, and the ink layer left on the substrate after embossing is thicker; on the contrary, if the pit is shallow, the amount of ink contained is less, and the ink layer left on the substrate after embossing is thinner. The printing plate of gravure printing is composed of pits and the surface of the printing plate corresponding to the original text. During printing, the ink is filled into the pits, the ink on the surface of the printing plate is scraped off with a squeegee, the printing plate is in contact with the substrate under a certain pressure, and the ink in the pits is transferred to the substrate to complete the printing.

Thermal transfer printing is a new method of printing patterns on goods of various materials, especially suitable for making small and diverse personalized and customized goods, and printing patterns containing full-color images or photos. The principle is to pre-print the color pattern on the heat-resistant substrate film by release treatment, and then cooperate with special transfer equipment to accurately transfer the pattern to the surface of the product by hot stamping at high temperature and pressure.

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