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 introduces the technical characteristics of flexible platemaking by taking the KMY type flexible platemaking machine as an example.
First, flexible platemaking machine
KMY flexible platemaking machine integrates four processes of exposure, plate washing, drying and post-processing. All production procedures are controlled by microcomputers, with accurate data, high accuracy and simple operation. The device functions as follows:
1. Exposure: The use of imported special plate lamp as exposure light source, the light source is stable.
2. Wash plate: use two-way automatic washing plate, wash plate brush fine, good stiffness, can make 150 lines / inch screen version and relatively fine lines and trumpet text.
3, baking version: automatic temperature control, heating evenly.
4. Post-processing: The imported Philips is used in addition to the sticky lamp tube, with mixed exposure, saving time and high work efficiency.
Second, the flexographic plate making process
Flexo plate process flow: original → film (female) → exposure → rinse → drying → post-processing.
1. Manuscript: Original manuscript for flexible printing should have the following characteristics: 1 more colors, but less superimposition; 2 does not require reproduction of particularly small details; 3 network lines are not too high, but can achieve color printing effects; 4 can be made online Packaging processing.
2, Film (Ming film): 1 to meet the needs of the plate, graphic and clear, accurate size and size specifications; 2 use of frosted film; 3 requires the same film density of the four corners; 4 using film positive character; 5 measured by transmission densitometer, white density 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 tiled downwards in the exposure drawer to expose the 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: photosensitive resin plate support film down, 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 light passes through the transparency 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 non-photosensitive part and keep 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 solvent to make the plate to restore the original size thickness. Baking temperature is generally between 50 °C -60 °C. 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 cause the printing plate to change 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 sticking 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.
The above introduces the KMY type flexible platemaking equipment and plate making process flow. With the rapid development of printing technology, our factory will keep pace with the times and continuously develop better plate-making equipment.
First, flexible platemaking machine
KMY flexible platemaking machine integrates four processes of exposure, plate washing, drying and post-processing. All production procedures are controlled by microcomputers, with accurate data, high accuracy and simple operation. The device functions as follows:
1. Exposure: The use of imported special plate lamp as exposure light source, the light source is stable.
2. Wash plate: use two-way automatic washing plate, wash plate brush fine, good stiffness, can make 150 lines / inch screen version and relatively fine lines and trumpet text.
3, baking version: automatic temperature control, heating evenly.
4. Post-processing: The imported Philips is used in addition to the sticky lamp tube, with mixed exposure, saving time and high work efficiency.
Second, the flexographic plate making process
Flexo plate process flow: original → film (female) → exposure → rinse → drying → post-processing.
1. Manuscript: Original manuscript for flexible printing should have the following characteristics: 1 more colors, but less superimposition; 2 does not require reproduction of particularly small details; 3 network lines are not too high, but can achieve color printing effects; 4 can be made online Packaging processing.
2, Film (Ming film): 1 to meet the needs of the plate, graphic and clear, accurate size and size specifications; 2 use of frosted film; 3 requires the same film density of the four corners; 4 using film positive character; 5 measured by transmission densitometer, white density 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 tiled downwards in the exposure drawer to expose the 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: photosensitive resin plate support film down, 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 light passes through the transparency 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 non-photosensitive part and keep 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 solvent to make the plate to restore the original size thickness. Baking temperature is generally between 50 °C -60 °C. 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 cause the printing plate to change 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 sticking 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.
The above introduces the KMY type flexible platemaking equipment and plate making process flow. With the rapid development of printing technology, our factory will keep pace with the times and continuously develop better plate-making equipment.
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