Photosensitive resin plates can be divided into two main types: solid photosensitive resin plates and liquid photosensitive resin plates. Although they differ in composition, manufacturing processes, and some performance characteristics, their applications are largely similar. 1) Liquid Photosensitive Resin Plates When producing a printing plate using liquid photosensitive resin, the material must first be coated onto a specific exposure device. This device typically consists of upper and lower precision glass plates along with UV light sources on both sides, allowing for front and back exposure of the plate. ※ Liquid Resin Coating, Primary Exposure, and Back Exposure The process begins by placing the negative emulsion side up on the lower glass plate, covering it with a thin film and applying vacuum to ensure close contact between the film and the negative. The photosensitive resin is then applied onto the cover film, followed by the substrate. The upper glass is placed on top, sandwiching the resin layer between the two glass plates. The back exposure ensures that the substrate and resin are firmly bonded together. During the primary exposure, light passes through the negative image and reaches the photosensitive resin layer. The areas exposed to light harden and become solid, while the non-exposed regions remain in a liquid state. After exposure, the printing plate is placed at an angle in a recovery tank to remove any excess unexposed resin from the surface. ※ Rinsing (Development) Once exposed, the printing plate is placed in a development machine, where a special brush removes any remaining liquid resin from the surface. After rinsing, the plate is dried in an oven, and then undergoes post-exposure treatment to fully harden the resin. Although liquid photosensitive resin plates have been used in the domestic flexo printing industry, their usage is limited. They are primarily used for corrugated box plate making but suffer from issues such as limited plate size, low resolution, and poor tactile quality, making them unsuitable for high-resolution image printing. 2) Solid Photosensitive Resin Plates Unlike liquid plates, solid photosensitive resin plates come pre-coated, much like the PS plates used in lithography. These plates should be stored in light-protected cardboard boxes. When in use, they are simply taken out and cut to the required size, making them very convenient for operation. In China, commonly used solid photosensitive resin plates include DuPont's Cyrel, BASF from Germany, GS from China, Poly from the U.S., and Co-Prosperity from Japan. These plates come in various specifications, thicknesses, and hardness levels. Despite these differences, they share several common features: a. Similar plate structure; b. Use of the same exposure machines and plate washing machines; c. Same plate washing solution, usually organic solvents like trichloroethylene or tetrachloroethylene; d. Uniform operating procedures, including the same sequence of steps. Production Process of Solid Resin Plates: Manuscript → Create Positive Image Negative → Cutting and Opening → Pre-exposure → Main Exposure → Rinsing (Development) → Drying → Post-processing → Post-exposure → Correction. Copper Wire Cleaning Ball,Copper Sponge Scrubber,Metal Sponge Scourer,Brass Sponge Scrubber Jiangmen Pengjiang Guanqi Trading Co., Ltd. , https://www.kwunkeeindustry.com