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First, bad ink (blind version)
1. Inking part is not inked or slightly blurred Cause: Part of the printing plate is worn out; the dampening solution is too acidic to emulsify the ink; the ink roller pressure is too high.
Processing method: replace the printing plate; adjust the pH value of the fountain solution; spray the reducing agent on the ink roller or stop cleaning the ink roller, and adjust the pressure between the ink roller and the plate cylinder.
2. The inked part is completely uninked or repeated printing of the same part of each page occurs because of blanket depression.
Remedy: Apply reductant or replace blanket on blanket.
Second, the entire surface of the printing plate is stained with ink or ink color
Cause: When the layout is dry during initial operation, or when the machine is restarted, the layout is dry. During normal operation, a part of the water roller is not in contact with the plate. The pressure of the brush roller and the roller is not proper, or the brush roller is worn and the water is insufficient. .
Treatment method: Instantly increase the speed of the water supply motor can increase the amount of water to quickly remove the glue. Or check the brush roller for wear, replace the brush roller if necessary, or readjust the pressure of the brush roller, plate roller, and water roller.
3. At the beginning of printing, the non-inked part was stained with a lot of paper powder
Cause: When printing is started, if the new ink reaches the front of the plate, the water roller will be in contact with the plate for a long time and the plate will be contaminated. If the ink is not adjusted in advance and the ink roller is dry, the printing is particularly likely to occur.
Treatment method: Stop the machine immediately and clean the layout. Then change the set time to start printing. Before starting up again, the ink roller should be adjusted. If you only increase the amount of water without stopping the machine, the water and ink will be out of proportion, and the waste product rate will be reduced.
rise.
Fourth, bad words - text and dots are damaged by ink
Reason: excessive ink; ink viscosity is too high; ink roller pressure is too large; after the plate or blanket lining; pH value of fountain solution is inappropriate; printing plate wear.
Processing method: reduce the speed of the ink supply motor or change the gap between the ink fountain and the ink fountain roller to reduce the ink volume; reduce the ink viscosity; adjust the pressure of the ink roller and plate roller; reduce the thickness of the plate or blanket lining; change the dampening fluid PH value;
Replace the plate.
Fifth, granular - Ink part of the thin and weak
Causes: The speed of the water supply motor is too high; the ink is insufficient; the pressure of the plate roller and the squeegee is insufficient; the blanket is cracked or stained; the ink of the printing plate is partially worn; the paper of the web is too much.
Processing method: reduce the speed of the water supply motor; increase the gap between the ink fountain and the ink fountain roller to increase the ink volume; increase the thickness of the plate or blanket lining; wipe or replace the blanket; repair or replace the printing plate; perform paper on the web Powder elimination treatment.
6. Paper fluffing and ring-shaped white spots - White spots on the printing surface, black spots on the non-inked areas
Causes: There is dirt on the blanket and the ink roller; foreign matter is mixed in the ink; the surface of the blanket is sticky; the paper is fluffed due to the excessive viscosity of the ink; the paper roll paper is too much.
Treatment method: wipe the blanket and ink roller; replace the ink or add liquid to the ink to eliminate the foreign matter in the ink; replace the blanket; reduce the viscosity of the ink with a reducing agent; remove the paper powder from the web.
Seventh, dirty version (dirty) - non-inked part stained with ink; ink viscosity is too high or too much ink to make non-ink part of the pro-ink affinity
Causes: poor platemaking process; dirt on the water roller; jump or slippage caused by improper ink roller pressure; loose or damaged blanket; improper pH value of the fountain solution or excessive water quality; humidity of the printing plate material storage place is too high.
Processing method: change the plate making process; wipe the water roller; reset the pressure of the ink roller; tension the blanket or repair the blanket; adjust the PH value of the fountain solution or add softener and ion agent after inspection; change the printing plate Material storage conditions.
VIII. Ghosting - horizontal stripes of light appear on the paper; common is that shadows are destroyed
Cause: Thickness of plate or rubber blanket lining; Excessive ink output; Part of the printing plate ink is worn out; The pH of the fountain solution is bad; The ink on the plate is dry; The ink roller is set badly; The rubber cover of the rubber roller is uneven.
Treatment method: reduce the thickness of the plate or blanket lining; reduce the speed of the ink supply motor or change the gap between the ink fountain and the ink fountain roller to reduce the amount of ink; repair or replace the printing plate; adjust the PH value of the fountain solution; increase the speed of the water supply motor, increase the amount of water , To prevent the layout ink dry; Adjust the ink roller pressure; Check the parallelism of the ink roller rubber layer, replace the rubber roller if necessary.
Nine, ink roller ink failure - ink is not on the roller, ink is not uniform
Cause: Inappropriate ink roller pressure; worn or recessed rubber roller at both ends to make it in poor contact; ink roller cracking; ink roller, heavy roller coating wear; dampening solution is too acidic to emulsify the ink; ink composition is not right.
Treatment method: If the ink cannot be evenly inked, do not use strong roller pressure to operate. The pressure of the seal line of the roller should be uniform as a whole, and the pressure should be as small as possible within the scope of the print quality. If you find the roller is worn
The phenomenon of trapping or cracking should be replaced in a timely manner; the screed roller and heavy roller plating should be promptly repaired if worn; adjust the pH of the fountain solution or replace the ink.
Tenth, floating dirt - the printing surface as a whole irregular light-colored dirt and white
Cause: The blanket cleaning agent flows into the fountain solution; the amount of water is too large; the viscosity of the ink is too high; the ink is insufficient.
Treatment method: Replace with a clean fountain solution; reduce the speed of the water supply motor to reduce the amount of water; reduce the viscosity of the ink with a reducing agent; increase the speed of the ink supply motor and increase the ink supply.
Eleven, take the paper loose - paper relaxation between the printing press and folding machine
Reason: Reel paper is too low; rubber blanket lining is too thick; paper powder is piled on the blanket; paper press roller pressure is too low; cutter roller (RTF roller) and platen wheel on folding triangle Poorly determined.
Treatment methods: Adjust the spring or air pressure to increase the roll paper force; change the blanket lining thickness; scrub the blanket; adjust the pressure of the paper pull roller and the pressure roller.
Twelve, broken paper
Cause: Roll paper force or brake setting is bad; fountain solution is excessive; roll paper power is not enough; paper guide roller parallelism is abnormal.
Treatment method: Change the force of the web by adjusting the relevant elements, change the braking effect of the brake; reduce the amount of water; check the parallelism of the paper guide roller; replace the web.
Thirteen, paper folds
Causes: Blanket, damage, looseness, unsuitable lining of the squeegee; excess ink and fountain solution; excessive tension on the web; abnormality in the paper guide roller parallelism or ink and dirt; Poor pager adjustment.
Treatment method: Scrub, tension blanket, change the thickness of its lining; reduce the amount of ink and water; reduce the paper roll power; wipe the paper guide roller, check the parallelism; readjust the folding machine; replace the web .
1. Inking part is not inked or slightly blurred Cause: Part of the printing plate is worn out; the dampening solution is too acidic to emulsify the ink; the ink roller pressure is too high.
Processing method: replace the printing plate; adjust the pH value of the fountain solution; spray the reducing agent on the ink roller or stop cleaning the ink roller, and adjust the pressure between the ink roller and the plate cylinder.
2. The inked part is completely uninked or repeated printing of the same part of each page occurs because of blanket depression.
Remedy: Apply reductant or replace blanket on blanket.
Second, the entire surface of the printing plate is stained with ink or ink color
Cause: When the layout is dry during initial operation, or when the machine is restarted, the layout is dry. During normal operation, a part of the water roller is not in contact with the plate. The pressure of the brush roller and the roller is not proper, or the brush roller is worn and the water is insufficient. .
Treatment method: Instantly increase the speed of the water supply motor can increase the amount of water to quickly remove the glue. Or check the brush roller for wear, replace the brush roller if necessary, or readjust the pressure of the brush roller, plate roller, and water roller.
3. At the beginning of printing, the non-inked part was stained with a lot of paper powder
Cause: When printing is started, if the new ink reaches the front of the plate, the water roller will be in contact with the plate for a long time and the plate will be contaminated. If the ink is not adjusted in advance and the ink roller is dry, the printing is particularly likely to occur.
Treatment method: Stop the machine immediately and clean the layout. Then change the set time to start printing. Before starting up again, the ink roller should be adjusted. If you only increase the amount of water without stopping the machine, the water and ink will be out of proportion, and the waste product rate will be reduced.
rise.
Fourth, bad words - text and dots are damaged by ink
Reason: excessive ink; ink viscosity is too high; ink roller pressure is too large; after the plate or blanket lining; pH value of fountain solution is inappropriate; printing plate wear.
Processing method: reduce the speed of the ink supply motor or change the gap between the ink fountain and the ink fountain roller to reduce the ink volume; reduce the ink viscosity; adjust the pressure of the ink roller and plate roller; reduce the thickness of the plate or blanket lining; change the dampening fluid PH value;
Replace the plate.
Fifth, granular - Ink part of the thin and weak
Causes: The speed of the water supply motor is too high; the ink is insufficient; the pressure of the plate roller and the squeegee is insufficient; the blanket is cracked or stained; the ink of the printing plate is partially worn; the paper of the web is too much.
Processing method: reduce the speed of the water supply motor; increase the gap between the ink fountain and the ink fountain roller to increase the ink volume; increase the thickness of the plate or blanket lining; wipe or replace the blanket; repair or replace the printing plate; perform paper on the web Powder elimination treatment.
6. Paper fluffing and ring-shaped white spots - White spots on the printing surface, black spots on the non-inked areas
Causes: There is dirt on the blanket and the ink roller; foreign matter is mixed in the ink; the surface of the blanket is sticky; the paper is fluffed due to the excessive viscosity of the ink; the paper roll paper is too much.
Treatment method: wipe the blanket and ink roller; replace the ink or add liquid to the ink to eliminate the foreign matter in the ink; replace the blanket; reduce the viscosity of the ink with a reducing agent; remove the paper powder from the web.
Seventh, dirty version (dirty) - non-inked part stained with ink; ink viscosity is too high or too much ink to make non-ink part of the pro-ink affinity
Causes: poor platemaking process; dirt on the water roller; jump or slippage caused by improper ink roller pressure; loose or damaged blanket; improper pH value of the fountain solution or excessive water quality; humidity of the printing plate material storage place is too high.
Processing method: change the plate making process; wipe the water roller; reset the pressure of the ink roller; tension the blanket or repair the blanket; adjust the PH value of the fountain solution or add softener and ion agent after inspection; change the printing plate Material storage conditions.
VIII. Ghosting - horizontal stripes of light appear on the paper; common is that shadows are destroyed
Cause: Thickness of plate or rubber blanket lining; Excessive ink output; Part of the printing plate ink is worn out; The pH of the fountain solution is bad; The ink on the plate is dry; The ink roller is set badly; The rubber cover of the rubber roller is uneven.
Treatment method: reduce the thickness of the plate or blanket lining; reduce the speed of the ink supply motor or change the gap between the ink fountain and the ink fountain roller to reduce the amount of ink; repair or replace the printing plate; adjust the PH value of the fountain solution; increase the speed of the water supply motor, increase the amount of water , To prevent the layout ink dry; Adjust the ink roller pressure; Check the parallelism of the ink roller rubber layer, replace the rubber roller if necessary.
Nine, ink roller ink failure - ink is not on the roller, ink is not uniform
Cause: Inappropriate ink roller pressure; worn or recessed rubber roller at both ends to make it in poor contact; ink roller cracking; ink roller, heavy roller coating wear; dampening solution is too acidic to emulsify the ink; ink composition is not right.
Treatment method: If the ink cannot be evenly inked, do not use strong roller pressure to operate. The pressure of the seal line of the roller should be uniform as a whole, and the pressure should be as small as possible within the scope of the print quality. If you find the roller is worn
The phenomenon of trapping or cracking should be replaced in a timely manner; the screed roller and heavy roller plating should be promptly repaired if worn; adjust the pH of the fountain solution or replace the ink.
Tenth, floating dirt - the printing surface as a whole irregular light-colored dirt and white
Cause: The blanket cleaning agent flows into the fountain solution; the amount of water is too large; the viscosity of the ink is too high; the ink is insufficient.
Treatment method: Replace with a clean fountain solution; reduce the speed of the water supply motor to reduce the amount of water; reduce the viscosity of the ink with a reducing agent; increase the speed of the ink supply motor and increase the ink supply.
Eleven, take the paper loose - paper relaxation between the printing press and folding machine
Reason: Reel paper is too low; rubber blanket lining is too thick; paper powder is piled on the blanket; paper press roller pressure is too low; cutter roller (RTF roller) and platen wheel on folding triangle Poorly determined.
Treatment methods: Adjust the spring or air pressure to increase the roll paper force; change the blanket lining thickness; scrub the blanket; adjust the pressure of the paper pull roller and the pressure roller.
Twelve, broken paper
Cause: Roll paper force or brake setting is bad; fountain solution is excessive; roll paper power is not enough; paper guide roller parallelism is abnormal.
Treatment method: Change the force of the web by adjusting the relevant elements, change the braking effect of the brake; reduce the amount of water; check the parallelism of the paper guide roller; replace the web.
Thirteen, paper folds
Causes: Blanket, damage, looseness, unsuitable lining of the squeegee; excess ink and fountain solution; excessive tension on the web; abnormality in the paper guide roller parallelism or ink and dirt; Poor pager adjustment.
Treatment method: Scrub, tension blanket, change the thickness of its lining; reduce the amount of ink and water; reduce the paper roll power; wipe the paper guide roller, check the parallelism; readjust the folding machine; replace the web .
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