Photosensitive resin plates can be categorized into two main types: solid photosensitive resin plates and liquid photosensitive resin plates. Although these two materials differ in composition, manufacturing process, and some performance characteristics, they are generally used for similar applications. 1) Liquid Photosensitive Resin Plates When producing a plate, liquid photosensitive resin is first coated onto a specific exposure unit. This device typically consists of upper and lower precision glass plates along with UV light sources on both sides, enabling the printing plate to be exposed from both the front and back. ※ Liquid Resin Coating, Primary Exposure, and Back Exposure To apply the liquid resin, the negative emulsion side should be placed face up on the lower glass plate. A thin protective film is then placed over it, and vacuum is applied to ensure close contact between the film and the negative image. The photosensitive resin is coated onto the cover film, and the substrate is placed on top of the resin layer. The upper glass is then lowered, sandwiching the resin layer between the two glass plates. The back exposure helps bond the substrate and the resin firmly together. During the primary exposure, light passes through the negative image and reaches the photosensitive resin layer on top. The areas exposed to light harden and become solid, while the unexposed areas remain in a liquid state. After exposure, the printing plate is tilted and placed in a recovery tank to remove any excess unexposed resin. ※ Rinsing (Development) The exposed printing plate is then processed using a special brush in a developing tank to remove the remaining photosensitive resin from the surface. Once developed, the plate is dried in an oven and undergoes post-exposure treatment to fully cure the resin on the plate. Liquid photosensitive resin plates are not widely used in China’s flexographic printing industry. They are mainly used for corrugated box plate making. However, they have several limitations, such as restricted plate size, low resolution, and poor tactile quality, making them unsuitable for high-quality image printing. 2) Solid Photosensitive Resin Plates Unlike liquid plates, solid photosensitive resin plates are pre-coated, similar to the PS plates used in lithography. These plates should be stored in light-protected cardboard boxes. When in use, they are easy to take out and cut to the required size directly from the box. 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, but they share several common features: a. Similar plate structure; b. Same exposure machines and plate washing equipment; c. Identical development solutions, typically organic solvents like trichloroethylene and tetrachloroethylene; d. Consistent production processes, following the same steps from exposure to post-processing. 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. Brush With Plastic Handle,Dishwashing Handle Sponge,Heavy Duty Scourers,Wire Wool Scourers Jiangmen Pengjiang Guanqi Trading Co., Ltd. , https://www.kwunkeeindustry.com