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First, flexible platemaking machine
JS900 type flexible platemaking machine integrates four processes of exposure, washing, drying and post-processing. All production procedures are controlled by high-quality electrical appliances, with accurate data, high precision, and simple operation. The function of this equipment is as follows: 1. Exposure: The light bulb is used as a light source for the exposure of South Korea's national special edition lamp. The light source is stable. 2. Wash plate: Use two-way automatic washing plate, wash plate brush fine, good stiffness, can make more than 200 lines of cable version and more detailed lines and trumpet text. 3, baking version: automatic temperature control, heating evenly. 4. Post-processing: Shanghai famous brand in addition to stick lamp, mixed exposure, save time and work efficiency.
Second, the flexographic plate making process
Flexo platemaking process flow: Original → Film (negative) → Exposure → Flush → Drying → Post-processing.
1. Manuscript: Original manuscripts suitable for flexible printing should have the following characteristics: 1 More colors, but less superimposition; 2 No special details required to be reproduced; 3 Network lines are not too high, but color printing effects can be achieved; 4 Can be made online Packaging processing.
2, film (female film): 1 to meet the needs of the plate, graphic and clear, accurate size and size specifications; 2 use of frosted film; 3 requires uniform film density of the four corners; 4 use film positive character; 5 use transmission density measurement, the density of white bits It is 0.06 or less; the black density is 3.5 or more.
3, exposure: back exposure and main exposure:
1 Back exposure: The supporting film of the photosensitive resin plate is laid down in the exposing drawer to cover the upward protective film. Ultraviolet light penetrates the supporting film to cure the photosensitive adhesive layer. The purpose is to establish a stable base, but also to control the depth of wash plate, and strengthen the binding force of the support film and the photosensitive resin layer. The back exposure time is determined based on the required substrate thickness.
2 Main exposure: The photosensitive resin plate is supported with the film facing down and the protective film facing up. Tile in the exposure drawer, the protective film is peeled off once, then the film surface of the film is pasted on the photosensitive resin plate material, the vacuum film is flatly covered on the film (non-pharmaceutical film surface), vacuum is applied, so that the film is sensitive The resin layer is closely attached. Ultraviolet rays pass through the vacuum film and the translucent part of the film, so that the photosensitive part of the plate is polymerized and cured. The length of the main exposure is determined by the plate type and the light source strength. If the exposure time is too short, the graphic gradient will be too straight, the lines will be curved, and the small prints and small dots will be washed away. On the other hand, if the exposure time is too long, the print will be distorted. If there are large and small characters on the same plate, thick and thin lines, the black and blue films can be used to cover the exposure separately. Small parts will not be lost due to flushing to ensure plate quality.
4. Rinse: Wash and dissolve the unexposed part, leaving the photopolymerized relief. Washing time depends on the thickness of the printing plate and the depth of the impression. If the washing time is too short, the unsensitized resin will remain on the plate, which will affect the plate-making depth. If the plate-washing time is too long, the plate will swell, resulting in deformation of the fine part or Fall off.
5, Drying: remove the washing solvent, make the plate to restore the original size and thickness. The baking temperature is generally between 50-60 degrees. The baking time is determined by the thickness of the plate and the length of the plate-washing time, generally two hours thick and one hour thin. Too long baking time and too high baking temperature will make the printing plate brittle and affect the printing life. If the baking temperature is too low, the drying time will be prolonged, the baking time will be too short, and the printing will be rotted.
6, post-processing: that is, in addition to adhesion and exposure. The photosensitive resin is completely hardened (polymerized) to achieve the required hardness index, and eliminate the tackiness of the printing plate to facilitate ink transfer. The post-processing time was obtained from the test with the aim of not cracking or sticking.
Flexographic Printing Profile
Flexo printing, as an environmentally friendly printing, has been rapidly developed. The flexographic printing plate has high elasticity, high printing durability, and high resolution. To produce high-quality printing plates, in addition to high-quality plates, high-quality plate-making techniques and plate-making equipment are also required. This paper takes the JS900 flexographic platemaking machine as an example to introduce the technical features of the flexo plate making.