Pneumatic ink pumps generally use a gas valve adjustment knob to control the flow. However, the amount of ink sucked by this pump is very large. Even if the knob is slightly adjusted, the ink pump is still working and the flow rate is excessive. Trying to reduce the amount of knob adjustment, ink supply work sometimes stop in production, if not found in time, it will cause prints to appear color, even waste, knob adjustment a little large, from the ink flow will not be too large and the ink flow Splashing in the ink tank, especially the thin ink or the flow of the ink in the hot season, is more prone to splashing, contaminates the body, the drum and the substrate, affects the quality of the printed product, and limits the printing speed. Once the ink is dried on the ink tank water level, it is difficult to clean and change colors.
In order to control the failure of the pneumatic ink pump fine-tuning knob, we made a flow control device similar to a medical infusion set, stuck on the ink-absorbing soft, and controlled the flow rate. The actual use proves that the device is easy to use and the amount of ink is controlled freely, which solves the problem that the ink supply of the pneumatic ink pump is stopped or the flow rate is too large.
When using a platen printer to print some products that need to use the port number, if the plate cannot be pulled down, the plate cylinder is required to meet the printing requirements. By the drum operation is not complicated, as long as the plate roller drive gear scale, look for directions, there is no scale, borrow the drum inconvenient, borrow four sets of rollers, find the rules of operation often takes several hours. When reprinting other products, it is necessary to borrow back the drum. Actual operation takes time and effort.
For this situation, it can be based on paper size, graphic size. Use the plates to solve the problem. Before installing the PS version, the PS version is cut to about 5mm. With only a small amount of pull, you can find good rules. You do not need to borrow the drum to reduce the number of hours of assistance and increase the production efficiency. This method is also applicable to other types of offset presses.
In addition, this problem can also be solved in the imposition or printing process. When printing, reduce the distance between the mouth and about 5mm. There is no need to cut the plate directly before printing, and you do not need to borrow the plate roller.
Determining the lining amount of the roller lining The so-called lining of the roller lining is defined on the plate cylinder and the blanket cylinder, covering a certain thickness of the cushioning material as required, for adjusting the gap between the rollers and the printing pressure, so that the roller gear is The circular tangential position meshes to meet the offset printing process requirements.
Correcting offset roller pressure is one of the key technologies for offset press operation. It is a prerequisite for the normal operation of the offset press. It is based on the cutting volume of Feng Chuan, printing technical conditions, product quality requirements and some technical parameters within a reasonable range of adjustment. However, some offset presses do not have technical data. It is particularly important how to correctly adjust and correct the roller pressure. Here, let us talk about the author's experience and communicate with my colleagues. The specific operation methods are as follows.
1. Check whether the rollers of the offset printing machine are walking the rollers or not. Roller-folding offset presses can be used to check contact by light or ink under pressure conditions. An offset printing machine that does not use a roller should engage the roller gear at the tangential position of the pitch circle, and measure the gap between the two roll bearings after the pressure is compressed by pressing the wire. Note that the gap between the two sides of the roll should not exceed 0.02mm, lead wire should not be too thick, Beiren J2108A roll gap error is 0.20mm.
2. The method of pressing the lead wire is used to measure the gap between the plate cylinder and the blanket cylinder, the squeegee cylinder and the impression cylinder after the pressurization.
3. Calculate the lining amount of each roller. Take Beiren J2108A offset printing press as an example. After measuring the known pressure, the gap A between the printing roller and the blanket roller is 3.85mm. The clearance B between the blanket roller and the impression roller is 3.20mm. The pillow clearance is 0.20mm, the measuring plate pressure is 0.10mm, and the printing pressure is 0.20mm. The rubber roller blanket lining capacity is y and can be calculated by the following formula:
y=3.20mm-0.10mm+0.20mm=3.30mm
Plate roller lining x, can be calculated by the following formula:
x=3.85mm-3.30mm+0.10mm=0.65mm
4. After the drum is lining, the pressure between the three drums is measured by the pressure bar method, and the pressure of the ink roller and the water roller on the plate cylinder.
One printing method - less local development method In the printing work, we often need to dry some printing plates that are subsidized due to local graphic changes, especially when the part of the subsidies on the printing plate is sulfuric acid paper, due to the sulfuric acid paper. The thickness and its graphic density are different from the thickness of the film and its graphic density. After exposing to the same time exposure and printing, the PS has different shades of picture and picture, and it has enough to be solidified. (12) The quality of the printing capacity and print quality of the S.K.
For this purpose, localized little development can be used for processing. The specific methods are as follows: 1) Put the subsidized film on the PS plate after the exposing and exposing, and develop it on the developing machine at a faster developing speed. At this time, the layout is supplemented by some graphic and clear, and the other parts are insufficiently developed. False; 2) Use the transparent tape to put the PS version on the graphic part of the subsidy, and then send the PS version to the developing machine. On the PS plate in addition to the secondary image of the secondary development, after the development of clear graphics; 3) peeling transparent tape, and then use gauze and gasoline to erase the PS plate on the adhesive tape site.
This partial development method is only suitable for subsidizing the printing plate with smaller area of ​​the film.
Smart change 08,05 machine water supply device 08, 05 machine water supply device - plastic pot, the lower end of the plastic pipe led to the bucket by the switch of water. Due to an operation error or when the machine is turned off and then turned on, it is difficult to adjust the required amount of water temporarily. Overflow phenomenon often occurs. In severe cases, the printed product will cause scrap, and the machine will be stopped and wiped out. Here I introduce a solution: Install two switches on the plastic tube, one for the main switch, the other for the normal operation of the machine, the required amount of water control switch. The opening and stopping of the printing press need only be controlled by the master switch.
Offset Water Small experience Two methods to prevent the printing plate from squeezing the ink: When the plate is mounted, the printing plate can often encounter the phenomenon of ink pick-up. According to the principle of ink-and-wash repulsion, water can be used to wipe off the protective glue on the edge of the printing plate before loading, and then reload the plate. In this way, there will be no ink intrusion on the plates.
Blanket except dirt: When the quality of the paper used for printing is poor, the paper under the printing pressure, there are powder off, dust off, pull hair phenomenon, these paper powder, paper hair piled on the blanket, seriously affecting the product quality. In this regard, the operator can wipe the blanket with water first, and then scrub with gasoline, so as to save gas and wipe clean.
J4140 machine roller type side gauge troubleshooting an example When using the J4140 printing machine to print the clothing label of the comparison rules, often around the side of the rule 0.3-1mm error, sometimes pull the paper is not in place, and sometimes pull the paper too far.
The initial judgment is due to the wear of the side regulatory plate. Remove the view, there is indeed a wear groove about 1mm deep. After the paper is flattened and reinstalled with fine sandpaper, 250g/m squared whiteboard paper is printed. When the side panel is not pulled or the paper is not in place. Increase the paper pressure on the side gauge pull roller, start printing, or pull the paper out of place. (To be continued)
In order to control the failure of the pneumatic ink pump fine-tuning knob, we made a flow control device similar to a medical infusion set, stuck on the ink-absorbing soft, and controlled the flow rate. The actual use proves that the device is easy to use and the amount of ink is controlled freely, which solves the problem that the ink supply of the pneumatic ink pump is stopped or the flow rate is too large.
When using a platen printer to print some products that need to use the port number, if the plate cannot be pulled down, the plate cylinder is required to meet the printing requirements. By the drum operation is not complicated, as long as the plate roller drive gear scale, look for directions, there is no scale, borrow the drum inconvenient, borrow four sets of rollers, find the rules of operation often takes several hours. When reprinting other products, it is necessary to borrow back the drum. Actual operation takes time and effort.
For this situation, it can be based on paper size, graphic size. Use the plates to solve the problem. Before installing the PS version, the PS version is cut to about 5mm. With only a small amount of pull, you can find good rules. You do not need to borrow the drum to reduce the number of hours of assistance and increase the production efficiency. This method is also applicable to other types of offset presses.
In addition, this problem can also be solved in the imposition or printing process. When printing, reduce the distance between the mouth and about 5mm. There is no need to cut the plate directly before printing, and you do not need to borrow the plate roller.
Determining the lining amount of the roller lining The so-called lining of the roller lining is defined on the plate cylinder and the blanket cylinder, covering a certain thickness of the cushioning material as required, for adjusting the gap between the rollers and the printing pressure, so that the roller gear is The circular tangential position meshes to meet the offset printing process requirements.
Correcting offset roller pressure is one of the key technologies for offset press operation. It is a prerequisite for the normal operation of the offset press. It is based on the cutting volume of Feng Chuan, printing technical conditions, product quality requirements and some technical parameters within a reasonable range of adjustment. However, some offset presses do not have technical data. It is particularly important how to correctly adjust and correct the roller pressure. Here, let us talk about the author's experience and communicate with my colleagues. The specific operation methods are as follows.
1. Check whether the rollers of the offset printing machine are walking the rollers or not. Roller-folding offset presses can be used to check contact by light or ink under pressure conditions. An offset printing machine that does not use a roller should engage the roller gear at the tangential position of the pitch circle, and measure the gap between the two roll bearings after the pressure is compressed by pressing the wire. Note that the gap between the two sides of the roll should not exceed 0.02mm, lead wire should not be too thick, Beiren J2108A roll gap error is 0.20mm.
2. The method of pressing the lead wire is used to measure the gap between the plate cylinder and the blanket cylinder, the squeegee cylinder and the impression cylinder after the pressurization.
3. Calculate the lining amount of each roller. Take Beiren J2108A offset printing press as an example. After measuring the known pressure, the gap A between the printing roller and the blanket roller is 3.85mm. The clearance B between the blanket roller and the impression roller is 3.20mm. The pillow clearance is 0.20mm, the measuring plate pressure is 0.10mm, and the printing pressure is 0.20mm. The rubber roller blanket lining capacity is y and can be calculated by the following formula:
y=3.20mm-0.10mm+0.20mm=3.30mm
Plate roller lining x, can be calculated by the following formula:
x=3.85mm-3.30mm+0.10mm=0.65mm
4. After the drum is lining, the pressure between the three drums is measured by the pressure bar method, and the pressure of the ink roller and the water roller on the plate cylinder.
One printing method - less local development method In the printing work, we often need to dry some printing plates that are subsidized due to local graphic changes, especially when the part of the subsidies on the printing plate is sulfuric acid paper, due to the sulfuric acid paper. The thickness and its graphic density are different from the thickness of the film and its graphic density. After exposing to the same time exposure and printing, the PS has different shades of picture and picture, and it has enough to be solidified. (12) The quality of the printing capacity and print quality of the S.K.
For this purpose, localized little development can be used for processing. The specific methods are as follows: 1) Put the subsidized film on the PS plate after the exposing and exposing, and develop it on the developing machine at a faster developing speed. At this time, the layout is supplemented by some graphic and clear, and the other parts are insufficiently developed. False; 2) Use the transparent tape to put the PS version on the graphic part of the subsidy, and then send the PS version to the developing machine. On the PS plate in addition to the secondary image of the secondary development, after the development of clear graphics; 3) peeling transparent tape, and then use gauze and gasoline to erase the PS plate on the adhesive tape site.
This partial development method is only suitable for subsidizing the printing plate with smaller area of ​​the film.
Smart change 08,05 machine water supply device 08, 05 machine water supply device - plastic pot, the lower end of the plastic pipe led to the bucket by the switch of water. Due to an operation error or when the machine is turned off and then turned on, it is difficult to adjust the required amount of water temporarily. Overflow phenomenon often occurs. In severe cases, the printed product will cause scrap, and the machine will be stopped and wiped out. Here I introduce a solution: Install two switches on the plastic tube, one for the main switch, the other for the normal operation of the machine, the required amount of water control switch. The opening and stopping of the printing press need only be controlled by the master switch.
Offset Water Small experience Two methods to prevent the printing plate from squeezing the ink: When the plate is mounted, the printing plate can often encounter the phenomenon of ink pick-up. According to the principle of ink-and-wash repulsion, water can be used to wipe off the protective glue on the edge of the printing plate before loading, and then reload the plate. In this way, there will be no ink intrusion on the plates.
Blanket except dirt: When the quality of the paper used for printing is poor, the paper under the printing pressure, there are powder off, dust off, pull hair phenomenon, these paper powder, paper hair piled on the blanket, seriously affecting the product quality. In this regard, the operator can wipe the blanket with water first, and then scrub with gasoline, so as to save gas and wipe clean.
J4140 machine roller type side gauge troubleshooting an example When using the J4140 printing machine to print the clothing label of the comparison rules, often around the side of the rule 0.3-1mm error, sometimes pull the paper is not in place, and sometimes pull the paper too far.
The initial judgment is due to the wear of the side regulatory plate. Remove the view, there is indeed a wear groove about 1mm deep. After the paper is flattened and reinstalled with fine sandpaper, 250g/m squared whiteboard paper is printed. When the side panel is not pulled or the paper is not in place. Increase the paper pressure on the side gauge pull roller, start printing, or pull the paper out of place. (To be continued)
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