With the continuous development of the label printing industry, it has evolved from the previous ordinary jobs to color multi-color, and the self-adhesive printing press has also switched from sheet-fed to fully-automatic web color printing. There are two processes for the printing and printing of self-adhesive printing presses: flat flattening and round flattening. The flat press type can be used for the selection of the medium and the soft base (polyester base). For the flat press, only the plate of the polyester base can be used to achieve the best printing effect. . The following describes the plate making process of the resin plate.
First introduce the equipment for plate making. The resin plate making machine is composed of four systems: exposure, vacuuming, plate washing and constant temperature drying. The light source of the platesetter is usually a side-by-side black light group with a light source output power of about 360 nm. The purpose of vacuuming the plate making machine is to make the film and the plate closely fit, and the resin plate after exposure is not distorted. The plate-making system of the plate-making machine is composed of a stainless steel washing tank and a soft and hard brush and motor. Two-way plane rotation. The plate making machine drying oven requires uniform heating, good circulation, and automatic constant temperature device to avoid overheating.
Film production
Film production is photographed with a camera, or typeset with a computer, and the hair is arranged with a laser. Usually, a negative image (negative film) of a positive character is seen with the negative image of the film. The density of the light-transmitting portion of the film is less than 0.05, and the density of the light-shielding portion is greater than 3. If it is lower than this standard, it will cause the exposure ultraviolet rays to penetrate the film, causing the image to be flushed to the end. Do not crease the film. Color cable work is usually done by an electric extension machine or a laser imagesetter.
2. Plate making process
(1) Exposure
First cut the plate according to the film size, the plate is better than the film 2-3mm, the vacuum film must be clean, if there are dust and stains, use anhydrous ethanol to clean. Remove the protective film on the plate so that the film side of the film faces the film of the plate. Open the vacuum to align the air between the film and the plate. Book the required exposure time. (This time is determined by the intensity of the lamp of the plate making machine and the font size of the plate making. If a piece of plate has both large and small fonts, the exposure time should be determined separately: the exposure time of large characters is short, and the exposure time of small characters and thin lines is long. The large part is covered with a mask, and the vacuum pump cannot be closed when it is covered, in case the plate is sunburned.
(2) flushing
The dried plate is applied on the flushing automatic plate with double-sided tape, and the two-way automatic washing is performed, and the plate is washed to the base of the plate (the flushing water must be poured into the washing tank before flushing, and the washing temperature is set).
(3) drying
Use the sponge to remove the floating water on the surface of the plate and put it in the drying box for drying. The temperature is generally set between 60-70 °C. The time is 10-20 minutes.
(4) Post exposure
After drying, the plate should be exposed again, so that the insufficiently photosensitive, incompletely cured part is completely cured in the process, so that the plate meets the required hardness standard.
With the continuous development of the label printing industry, it has evolved from the previous ordinary jobs to color multi-color, and the self-adhesive printing press has also switched from sheet-fed to fully-automatic web color printing. There are two processes for the printing and printing of self-adhesive printing presses: flat flattening and round flattening. The flat press type can be used for the selection of the medium and the soft base (polyester base). For the flat press, only the plate of the polyester base can be used to achieve the best printing effect. . The following describes the plate making process of the resin plate.
First introduce the equipment for plate making. The resin plate making machine is composed of four systems: exposure, vacuuming, plate washing and constant temperature drying. The light source of the platesetter is usually a side-by-side black light group with a light source output power of about 360 nm. The purpose of vacuuming the plate making machine is to make the film and the plate closely fit, and the resin plate after exposure is not distorted. The plate-making system of the plate-making machine is composed of a stainless steel washing tank and a soft and hard brush and motor. Two-way plane rotation. The plate making machine drying oven requires uniform heating, good circulation, and automatic constant temperature device to avoid overheating.
Film production
Film production is photographed with a camera, or typeset with a computer, and the hair is arranged with a laser. Usually, a negative image (negative film) of a positive character is seen with the negative image of the film. The density of the light-transmitting portion of the film is less than 0.05, and the density of the light-shielding portion is greater than 3. If it is lower than this standard, it will cause the exposure ultraviolet rays to penetrate the film, causing the image to be flushed to the end. Do not crease the film. Color cable work is usually done by an electric extension machine or a laser imagesetter.
2. Plate making process
(1) Exposure
First cut the plate according to the film size, the plate is better than the film 2-3mm, the vacuum film must be clean, if there are dust and stains, use anhydrous ethanol to clean. Remove the protective film on the plate so that the film side of the film faces the film of the plate. Open the vacuum to align the air between the film and the plate. Book the required exposure time. (This time is determined by the intensity of the lamp of the plate making machine and the font size of the plate making. If a piece of plate has both large and small fonts, the exposure time should be determined separately: the exposure time of large characters is short, and the exposure time of small characters and thin lines is long. The large part is covered with a mask, and the vacuum pump cannot be closed when it is covered, in case the plate is sunburned.
(2) flushing
The dried plate is applied on the flushing automatic plate with double-sided tape, and the two-way automatic washing is performed, and the plate is washed to the base of the plate (the flushing water must be poured into the washing tank before flushing, and the washing temperature is set).
(3) drying
Use the sponge to remove the floating water on the surface of the plate and put it in the drying box for drying. The temperature is generally set between 60-70 °C. The time is 10-20 minutes.
(4) Post exposure
After drying, the plate should be exposed again, so that the insufficiently photosensitive and incompletely cured part is completely cured in the process, so that the plate meets the required hardness standard.
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