The ink transfer device of the offset press requires the ink coating to be adapted to the needs of the print, and the continuity and stability are better. It is necessary to conform the pattern to spread the ink and also to meet a certain uniformity. This requires the inking device: performance design. Good; easy to adjust the amount of ink, high precision.
First, the ink supply part can store a certain amount of ink, according to the product requirements correctly adjusted, the ink is correctly and uniformly transferred to the uniform ink part.
The role of each part of the ink supply:
Bucket: Rotate ink.
Blade: Adjust the amount of ink.
Ink roller: ink thickness.
Ink roller: The ink layer is evenly transferred to the uniform ink roller.
Ink supply section adjustment:
1 ink tank, the amount of ink stored is the main factor affecting the depth of the product, the amount of ink for the ink fountain, to maintain a relatively stable ink fountain to use ink shovel diligently.
2 blade: require flat, straight, adjust the screw sensitive, do not stick with the ink above the screw, do not use pliers to twist, hammer hammer, clean the blade, adjust the screw sensitive, the only way to protect the micro-control ink.
3 The ink fountain roller should be kept clean, and there should be no debris in contact with the blade. When the ink fountain roller is not to be washed, it should be rubbed with a knife or sandpaper. The pumice powder should be used to permeate the gasoline. It should be washed with a soft cloth and dilute the gasoline to avoid affecting the accuracy of the ink fountain roller. .
4 Ink transfer roller: Because the transfer roller is in contact with the ink fountain roller, the lower roller is in contact with the uniform ink roller and works under the adjustment of the cam mechanism. Do not require too much contact pressure, pressure is greater than the pressure of the ink roller on the plate.
The main reason for uneven ink supply:
1 Ink texture is poor and lacks the necessary viscosity and toughness.
2 Ink mixing is not uniform, the ink contains solidified blocks or dry skin.
3 Incorrect adjustment of the parallelism and pressure between the ink roller and the ink roller, and between the ink roller and the plate cylinder.
Elimination method:
1 Select good quality ink, buy ink look for a good ink manufacturers purchase, do not buy this home today, which to buy tomorrow, resulting in unstable quality.
2 Make full use of the ink mixer. Ink and varnish, diluting agent, bright paste, dry oil, sticking agent and other auxiliary materials, stirring more evenly.
3 Adjust the parallelism between the ink rollers and between the ink roller and the plate cylinder.
4 Adjust the pressure between the ink roller and ink roller, ink roller and plate cylinder.
By the vertical and horizontal rotation of the ink roller, the ink becomes a thin, uniform ink film.
The value indicating the degree of uniformity of the ink in the entire ink level is called the uniform ink coefficient.
The size of the equivalence coefficient depends on the ratio of the area of ​​all the equidistant rollers and the ink receiving area of ​​the printing plate. The larger the ratio, the better the ink distribution performance.
Practice has proved that: To improve the thinness of the ink layer, we must increase the total area of ​​all the rollers. The way to increase the area of ​​the uniform ink roller is not to increase the diameter of the roller, but to increase the number of rollers to solve the problem.
An ink roller that uses the axial movement of the ink roller to improve ink distribution in the axial direction is called an ink roller. The mechanism that drives the ink roller to oscillate in the axial direction is referred to as an ink repelling mechanism.
Because the ink fountain ink cannot be distributed completely and uniformly, and the distribution of the text and the printing plate in the axial direction cannot be even. Therefore, in the ink transfer process, it is not enough to rely on the circumferential rotation of the ink distribution roller to transfer the ink. , It is necessary to have the axial movement of the ink roller, it is possible to further evenly ink in the axial direction, and the relative movement between the ink roller and the ink roller produces an axial sliding. Sliding ensures the uniformity of ink distribution of the ink in the axial direction of the ink roller.
The role of ink roller:
1 The uniform ink roller and the printing plate of the printing plate are rotated to perform radial motion.
2 The ink roller rotates axially along its own axis to make the ink transfer more uniform.
3 They rotate around their own axis.
4 increase the ink storage coefficient, so that ink ink film to adapt to printing requirements.
Third, the ink part of the general situation, the ink roller offset printing machine has 3-5, its role is to give the printing plate, pattern part of the amount of uniform ink.
Inking adjustment mechanism: landing gear, pressure adjustment mechanism.
The ink-requiring portion is required to uniformly transfer the ink film of the ink onto the printing plate while the ink film is thin. The quality of printed matter is related to the size of the ink roller diameter. Ink roller to reduce the depth of the problem before the ink. The Shore Hardness (SH) of the ink roller is 30°. The ink roller is soft and hard, and the hardness is high. The ink roller is not even. The ink roller is soft and the plate is clear. Therefore, the hardness and printing of the roller are the same. Quality is closely related.
Cot pressure adjustment:
1 The pressure of the ink roller and the ink roller is correspondingly small, and the pressure of the ink roller and the printing plate is larger. Adjust the pressure of the straight wire paper 0.1-0.2mm, and put the paper into the ink roller to press it upwards. In addition, it is also possible to measure the pressure with a steel sheet having a thickness of 0.15-0.20 mm.
2 When the ink roller comes into contact with the plate, it cannot slide. The request is to scroll. Because it is easy to damage the printing plate, it affects the printing rate of the printing plate.
Precautions when adjusting the ink roller:
1 When installing the ink roller, pay attention to the diameter of the ink roller. You must check the number of the roller. Do not make mistakes. Especially when you secure the ink roller, it is easy to make mistakes.
2 When adjusting the pressure of the test plate and the ink roller, the old printing plate can be used for testing. Do not use the new plate to test and adjust, so as not to scratch the plate and cause unnecessary waste.
3 When adjusting the contact pressure between the uniform ink roller and the ink roller, it is necessary to clean the ink roller, and pay attention to whether the ink roller is straight and round, and the ink roller with aging core park needs to be replaced in time. Pay attention to the symmetry of the eccentric bearing direction to avoid the phenomenon of light weight at the two ends of the ink roller. When testing the pressure between the ink roller and the ink roller, several points can be measured, and several points can be measured in the middle and at both ends to find the ink in time. The disadvantages of unevenness of the roller and unevenness of the eccentricity of the roller.
The total thickness of the liner in the printing plate must meet the standard, so as not to affect the debugging of the pressure between the ink roller and the plate, the debugging is inaccurate. The liner paper in the plate cylinder should be taken into account when the plate and the ink roller are taken into account. The pressure problem. (Wang Xincheng)
First, the ink supply part can store a certain amount of ink, according to the product requirements correctly adjusted, the ink is correctly and uniformly transferred to the uniform ink part.
The role of each part of the ink supply:
Bucket: Rotate ink.
Blade: Adjust the amount of ink.
Ink roller: ink thickness.
Ink roller: The ink layer is evenly transferred to the uniform ink roller.
Ink supply section adjustment:
1 ink tank, the amount of ink stored is the main factor affecting the depth of the product, the amount of ink for the ink fountain, to maintain a relatively stable ink fountain to use ink shovel diligently.
2 blade: require flat, straight, adjust the screw sensitive, do not stick with the ink above the screw, do not use pliers to twist, hammer hammer, clean the blade, adjust the screw sensitive, the only way to protect the micro-control ink.
3 The ink fountain roller should be kept clean, and there should be no debris in contact with the blade. When the ink fountain roller is not to be washed, it should be rubbed with a knife or sandpaper. The pumice powder should be used to permeate the gasoline. It should be washed with a soft cloth and dilute the gasoline to avoid affecting the accuracy of the ink fountain roller. .
4 Ink transfer roller: Because the transfer roller is in contact with the ink fountain roller, the lower roller is in contact with the uniform ink roller and works under the adjustment of the cam mechanism. Do not require too much contact pressure, pressure is greater than the pressure of the ink roller on the plate.
The main reason for uneven ink supply:
1 Ink texture is poor and lacks the necessary viscosity and toughness.
2 Ink mixing is not uniform, the ink contains solidified blocks or dry skin.
3 Incorrect adjustment of the parallelism and pressure between the ink roller and the ink roller, and between the ink roller and the plate cylinder.
Elimination method:
1 Select good quality ink, buy ink look for a good ink manufacturers purchase, do not buy this home today, which to buy tomorrow, resulting in unstable quality.
2 Make full use of the ink mixer. Ink and varnish, diluting agent, bright paste, dry oil, sticking agent and other auxiliary materials, stirring more evenly.
3 Adjust the parallelism between the ink rollers and between the ink roller and the plate cylinder.
4 Adjust the pressure between the ink roller and ink roller, ink roller and plate cylinder.
By the vertical and horizontal rotation of the ink roller, the ink becomes a thin, uniform ink film.
The value indicating the degree of uniformity of the ink in the entire ink level is called the uniform ink coefficient.
The size of the equivalence coefficient depends on the ratio of the area of ​​all the equidistant rollers and the ink receiving area of ​​the printing plate. The larger the ratio, the better the ink distribution performance.
Practice has proved that: To improve the thinness of the ink layer, we must increase the total area of ​​all the rollers. The way to increase the area of ​​the uniform ink roller is not to increase the diameter of the roller, but to increase the number of rollers to solve the problem.
An ink roller that uses the axial movement of the ink roller to improve ink distribution in the axial direction is called an ink roller. The mechanism that drives the ink roller to oscillate in the axial direction is referred to as an ink repelling mechanism.
Because the ink fountain ink cannot be distributed completely and uniformly, and the distribution of the text and the printing plate in the axial direction cannot be even. Therefore, in the ink transfer process, it is not enough to rely on the circumferential rotation of the ink distribution roller to transfer the ink. , It is necessary to have the axial movement of the ink roller, it is possible to further evenly ink in the axial direction, and the relative movement between the ink roller and the ink roller produces an axial sliding. Sliding ensures the uniformity of ink distribution of the ink in the axial direction of the ink roller.
The role of ink roller:
1 The uniform ink roller and the printing plate of the printing plate are rotated to perform radial motion.
2 The ink roller rotates axially along its own axis to make the ink transfer more uniform.
3 They rotate around their own axis.
4 increase the ink storage coefficient, so that ink ink film to adapt to printing requirements.
Third, the ink part of the general situation, the ink roller offset printing machine has 3-5, its role is to give the printing plate, pattern part of the amount of uniform ink.
Inking adjustment mechanism: landing gear, pressure adjustment mechanism.
The ink-requiring portion is required to uniformly transfer the ink film of the ink onto the printing plate while the ink film is thin. The quality of printed matter is related to the size of the ink roller diameter. Ink roller to reduce the depth of the problem before the ink. The Shore Hardness (SH) of the ink roller is 30°. The ink roller is soft and hard, and the hardness is high. The ink roller is not even. The ink roller is soft and the plate is clear. Therefore, the hardness and printing of the roller are the same. Quality is closely related.
Cot pressure adjustment:
1 The pressure of the ink roller and the ink roller is correspondingly small, and the pressure of the ink roller and the printing plate is larger. Adjust the pressure of the straight wire paper 0.1-0.2mm, and put the paper into the ink roller to press it upwards. In addition, it is also possible to measure the pressure with a steel sheet having a thickness of 0.15-0.20 mm.
2 When the ink roller comes into contact with the plate, it cannot slide. The request is to scroll. Because it is easy to damage the printing plate, it affects the printing rate of the printing plate.
Precautions when adjusting the ink roller:
1 When installing the ink roller, pay attention to the diameter of the ink roller. You must check the number of the roller. Do not make mistakes. Especially when you secure the ink roller, it is easy to make mistakes.
2 When adjusting the pressure of the test plate and the ink roller, the old printing plate can be used for testing. Do not use the new plate to test and adjust, so as not to scratch the plate and cause unnecessary waste.
3 When adjusting the contact pressure between the uniform ink roller and the ink roller, it is necessary to clean the ink roller, and pay attention to whether the ink roller is straight and round, and the ink roller with aging core park needs to be replaced in time. Pay attention to the symmetry of the eccentric bearing direction to avoid the phenomenon of light weight at the two ends of the ink roller. When testing the pressure between the ink roller and the ink roller, several points can be measured, and several points can be measured in the middle and at both ends to find the ink in time. The disadvantages of unevenness of the roller and unevenness of the eccentricity of the roller.
The total thickness of the liner in the printing plate must meet the standard, so as not to affect the debugging of the pressure between the ink roller and the plate, the debugging is inaccurate. The liner paper in the plate cylinder should be taken into account when the plate and the ink roller are taken into account. The pressure problem. (Wang Xincheng)
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