With the continuous development of the label printing industry, it has evolved from the former common job to color multicolor, and the adhesive printer has also turned from single sheet to automatic web color printing. There are two kinds of processes for the adhesive printing machine printing plate making: Flat and flat. Flat presses are available for both hard and soft substrates (polyester bases) in the choice of plate material, while polyester media can only be used for plates with round press flats to achieve the best printing results. . The following describes the resin plate making process.
First, the flattening of the resin First introduce the equipment for plate making. The resin platesetter consists of four systems: exposure, vacuum, plate washing, and constant temperature drying. The light source of the plate making machine is usually a side-by-side black light lamp group, and its light source output power is around 360 nm. The purpose of the vacuum in the plate making machine is to allow the film and plate to fit tightly, and the exposed resin plate will not be distorted. The platesetter plate washing system is composed of a stainless steel washing tank and a soft and hard-appropriate brush and motor. Bi-directional plane rotation. The drying oven of the plate making machine requires uniform heating, good circulation, and automatic thermostat device to avoid overheating.
1. Film Production Film production is photographed with a camera, or typeset with a computer, and a laser image-setter is used to print. It is common to use a negative image, which is a positive image (negative film). The density of the light-transmissive part of the film is less than 0.05, and the density of the light-shielding part is greater than 3. If it is lower than this standard, it will cause the exposure of ultraviolet rays to penetrate the film and cause the part of the graphic text to not flush. Do not crease the film. Color network cable jobs usually use electrical extensions, or laser imagesetters, to produce films.
2. Platemaking process (1) Exposure The plate is cut according to the size of the film. The plate is preferably larger than the film 2-3mm. The vacuum film must be cleaned. If there is dust and stains, clean it with anhydrous ethanol. The protective film on the plate is peeled off so that the film surface of the film and the film film of the plate face each other. Vacuum adsorption is turned on to queue the air between the film and the plate. Set the desired exposure time. (This time is determined by the light source intensity of the platesetter and the font size of the plate. If a plate has both large and small fonts, the exposure time should be determined separately: large characters have a short exposure time, small words and fine lines have a long exposure time. The large part is masked with a mask and the vacuum pump cannot be closed to prevent it from drying out.
(2) Rinse the slick plate with double-sided adhesive tape on the flushing plate, and perform bi-directional automatic flushing. Wash the plate to the base layer of the plate. (The flush tank must be filled with clean water before flushing, and the flushing temperature should be set.)
(3) Drying Wash the rinsed plate with a sponge to remove the floating water on the surface of the plate and place it in a drying oven for drying. The temperature is generally set between 60-70°C. The time is 10-20 minutes.
(4) After exposure and drying of the plate, an exposure should be carried out again to make the insufficiently photo-sensitive and incompletely cured part completely cured in the process, so that the plate material can reach the required hardness standard.
The above plate-making process is a plate-making method for a flat pressurizing resin plate, and a hard-base domestic plate is used as a resin plate. Of course, imported polyester version can also use this mode of plate making. The following describes the round flattening polyester version, which is the plate making process of fully automatic label printing.
The process of making round flattened polyester version and flat pressed flat resin version mainly differs in equipment. A roller type rotary exposure machine for producing a round flattened polyester version uses the diameter of the exposure roller according to the drum diameter of the fully automatic sticker machine. This plate-making machine rotates the drum for exposure, and the lamp is placed in an arc shape. After the film is prepared, the cut plate is vacuum adsorbed on a circular roller. After exposure, the exposure is completed. After the exposure is completed, the subsequent platemaking process is the same as the lithography process.
Please refer to the above table for common faults and disposal methods in the above plate making process. Welcome colleagues to discuss with us the technical aspects of the plate making process. (Text/Tianjin Ketai Hi-tech Development Corporation) (From "Print Today")
First, the flattening of the resin First introduce the equipment for plate making. The resin platesetter consists of four systems: exposure, vacuum, plate washing, and constant temperature drying. The light source of the plate making machine is usually a side-by-side black light lamp group, and its light source output power is around 360 nm. The purpose of the vacuum in the plate making machine is to allow the film and plate to fit tightly, and the exposed resin plate will not be distorted. The platesetter plate washing system is composed of a stainless steel washing tank and a soft and hard-appropriate brush and motor. Bi-directional plane rotation. The drying oven of the plate making machine requires uniform heating, good circulation, and automatic thermostat device to avoid overheating.
1. Film Production Film production is photographed with a camera, or typeset with a computer, and a laser image-setter is used to print. It is common to use a negative image, which is a positive image (negative film). The density of the light-transmissive part of the film is less than 0.05, and the density of the light-shielding part is greater than 3. If it is lower than this standard, it will cause the exposure of ultraviolet rays to penetrate the film and cause the part of the graphic text to not flush. Do not crease the film. Color network cable jobs usually use electrical extensions, or laser imagesetters, to produce films.
2. Platemaking process (1) Exposure The plate is cut according to the size of the film. The plate is preferably larger than the film 2-3mm. The vacuum film must be cleaned. If there is dust and stains, clean it with anhydrous ethanol. The protective film on the plate is peeled off so that the film surface of the film and the film film of the plate face each other. Vacuum adsorption is turned on to queue the air between the film and the plate. Set the desired exposure time. (This time is determined by the light source intensity of the platesetter and the font size of the plate. If a plate has both large and small fonts, the exposure time should be determined separately: large characters have a short exposure time, small words and fine lines have a long exposure time. The large part is masked with a mask and the vacuum pump cannot be closed to prevent it from drying out.
(2) Rinse the slick plate with double-sided adhesive tape on the flushing plate, and perform bi-directional automatic flushing. Wash the plate to the base layer of the plate. (The flush tank must be filled with clean water before flushing, and the flushing temperature should be set.)
(3) Drying Wash the rinsed plate with a sponge to remove the floating water on the surface of the plate and place it in a drying oven for drying. The temperature is generally set between 60-70°C. The time is 10-20 minutes.
(4) After exposure and drying of the plate, an exposure should be carried out again to make the insufficiently photo-sensitive and incompletely cured part completely cured in the process, so that the plate material can reach the required hardness standard.
Table: Common Faults and Treatments
Symptom Cause Solution Solution Flushing 1. Water temperature is too low
2. Low film density
3. Plate expired or light 1. Increase water temperature
2. Copy again
3. Replace the thin wire bending 1. Short exposure time
2. Low water temperature flushing time is too long
3. High density or fog in the light transmission section 1. Increase the exposure time
2. Straightening after light drying, increasing water temperature, sub-flushing
3. Incomplete copy of the original text produced by copying the film. 1. Defective film when ink is drawn
2. The cover of the plate-making machine has dirt 1. When the ink is traced, it is not careful to dry it and then print it.
2. Before printing, check whether the cover film has any small prints, separate points fall off, and exposure time is short.
2. The density of the transparent part of the film is too high
3. Improper drying and thermosetting
4. Plate is not firmly bonded 1. Increase the exposure time
2. Copy again
3. According to the correct method of operation
4. Replace the part of the material washed away not in the end, showing a piece of patchy 1. Water temperature is low
2. The density of the masking part of the film is low
3. Plate quality problems 1. Increase water temperature
2. Copy again
3. Change the pattern or scratches on the plate at the bottom of the plate. 1. No talcum powder before exposure, or glycerin caused bubbles between the film and the plate.
2. Inspiratory
3. Scrape the film with a knife 1. Apply talc before baking
2. Absorb when re-lighting
3. Can only wipe or use thinning liquid to trim the field version of the photosensitive layer and film base peeling 1. Drying time is not enough on the high-temperature thermosetting bubbles
2. The plate is not firmly bonded 1. After it is completely dried, it can be cured by heat.
2. Replace the plate. Crimping is severe. Drying and heat curing time is too long. Soak in water for 5 to 10 minutes and re-dry the plate. 1. Long drying time.
2. The finished version is not dried but exposed to air
3. Printing pressure is too large 1. According to normal operation
2. Drying
3. Reduce printing pressure
2. Low film density
3. Plate expired or light 1. Increase water temperature
2. Copy again
3. Replace the thin wire bending 1. Short exposure time
2. Low water temperature flushing time is too long
3. High density or fog in the light transmission section 1. Increase the exposure time
2. Straightening after light drying, increasing water temperature, sub-flushing
3. Incomplete copy of the original text produced by copying the film. 1. Defective film when ink is drawn
2. The cover of the plate-making machine has dirt 1. When the ink is traced, it is not careful to dry it and then print it.
2. Before printing, check whether the cover film has any small prints, separate points fall off, and exposure time is short.
2. The density of the transparent part of the film is too high
3. Improper drying and thermosetting
4. Plate is not firmly bonded 1. Increase the exposure time
2. Copy again
3. According to the correct method of operation
4. Replace the part of the material washed away not in the end, showing a piece of patchy 1. Water temperature is low
2. The density of the masking part of the film is low
3. Plate quality problems 1. Increase water temperature
2. Copy again
3. Change the pattern or scratches on the plate at the bottom of the plate. 1. No talcum powder before exposure, or glycerin caused bubbles between the film and the plate.
2. Inspiratory
3. Scrape the film with a knife 1. Apply talc before baking
2. Absorb when re-lighting
3. Can only wipe or use thinning liquid to trim the field version of the photosensitive layer and film base peeling 1. Drying time is not enough on the high-temperature thermosetting bubbles
2. The plate is not firmly bonded 1. After it is completely dried, it can be cured by heat.
2. Replace the plate. Crimping is severe. Drying and heat curing time is too long. Soak in water for 5 to 10 minutes and re-dry the plate. 1. Long drying time.
2. The finished version is not dried but exposed to air
3. Printing pressure is too large 1. According to normal operation
2. Drying
3. Reduce printing pressure
The above plate-making process is a plate-making method for a flat pressurizing resin plate, and a hard-base domestic plate is used as a resin plate. Of course, imported polyester version can also use this mode of plate making. The following describes the round flattening polyester version, which is the plate making process of fully automatic label printing.
The process of making round flattened polyester version and flat pressed flat resin version mainly differs in equipment. A roller type rotary exposure machine for producing a round flattened polyester version uses the diameter of the exposure roller according to the drum diameter of the fully automatic sticker machine. This plate-making machine rotates the drum for exposure, and the lamp is placed in an arc shape. After the film is prepared, the cut plate is vacuum adsorbed on a circular roller. After exposure, the exposure is completed. After the exposure is completed, the subsequent platemaking process is the same as the lithography process.
Please refer to the above table for common faults and disposal methods in the above plate making process. Welcome colleagues to discuss with us the technical aspects of the plate making process. (Text/Tianjin Ketai Hi-tech Development Corporation) (From "Print Today")
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