Lithography troubleshooting (2)
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6. The side gauge changes (the side pushed) (drive side)
Cause 1: The paper is not cut flat or not square.
Remedy: Re-cut or use the correct paper.
Cause 2: The push plate and the paper edge are not parallel. This situation may cause the positioning edge to bend, which may result in inaccurate side rules.
Treatment: Adjust the parallelism of the sideboard push plate, and update if the push plate is worn.
Cause 3: The gap between the platen and the paper is too large or too small.
Disposal: Use the thickness gauge to adjust the gap of the platen to be twice the thickness of the printed paper (within 0.25 m m). If the thickness exceeds 0.25 m m, the gap is given 0.13 m m.
Cause 4: The edge gauge touches the paper before it reaches the front gear.
Handling 1: Check and adjust the edge gauge time and the tarp mechanism. This tarp mechanism is to prevent the paper from reaching the front gear too fast.
Handling 2: Correct the edge gauge time.
7. The side gauge is changed (pulling paper) (operating side)
Cause 1: The edge gauge setting is incorrect.
Remedy: Reset the edge gauge according to the operating manual. Appropriate adjustment of the side gauge wheel
Reason 2: The spring tension between the top and bottom pullers is not correct. If the spring force is too small, the paper pull is not positioned. If it is too tight, the paper will be pressed against the baffle to form a curved shape. Not allowed.
Remedy: Try to set the appropriate pressure according to the printed paper. The tension of the tissue must be very accurate. Use the spring for the printed paper.
Cause 3: The paper jam gap in the front stop is too small or other obstacles to the side pull.
Handling 1: Re-adjust the front stop gap and remove any obstructions to make the side pulls smooth.
Handling 2 : Check the timing of the paper and front gear.
8. There is damage on the edge of the bite
Cause 1: The bite is too deep due to poor adjustment of the front gear.
Remedy: Adjust the front stop to be lighter.
Reason 2: Regardless of the method used to feed the paper, the front block does not make room when the paper is sent forward.
Remedy: Check and adjust the time of the front gear.
Cause 3: The accuracy of any bite jaws when transferring paper is inaccurate from paper feed to paper discharge.
Handling: Clean, lubricate and re-adjust all the biting jaws to maintain proper gripper tension and transfer time.
9. Wrinkles or wrinkles
Cause 1: The paper is not flat.
Handling: See Chapter 7 Paper (1) Question.
Cause 2: When the bite grips, the paper slides out of one or more of the bite jaws.
Handling: Clean and lubricate the biting jaws and biting jaws.
Cause 3: The bite jaws did not bite at the same time, causing the paper to skew.
Handling: The technicians of the agent should be found to correct the opening and closing time. The maintenance of modern printing machines in this respect is not done by the operators themselves.
Cause 4: The front gear (two or more) is not in line, which is like a bent edge.
Remedy: Turn all front gears into a straight line.
Cause 5: The roller pressure on the positioning table is too tight.
Remedy: Re-adjust the minimum pressure of the roller.
1 0 . The paper is pulled out from the bite and stuck to the blanket.
Reason 1: The tightness of the bite is not the viscosity of the ink. Most of the time, when there is a large area of full-page printing, if the bite is not tight, the paper will be broken by some biting claws.
Handling: Most jaw systems use a cam to grip, check the time average of each jaw and re-adjust if necessary.
Cause 2: The ink is extraordinarily sticky.
Treatment 1: Contact the ink manufacturer to find the right ink.
Treatment 2: Reduce the viscosity of the ink.
Cause 3: The blanket is so sticky that it is not easily peeled off.
Handling: Replace with a blanket that is easily peeled off.
Cause 4: The fast drying of the washing solvent caused the blanket to swell and be too viscous.
Treatment 1: Contact the solvent supplier to find a solvent that does not swell the blanket.
Handling 2: Contact the ink manufacturer to find the ink that will not be problematic.
1 1 . There is dirt
Cause 1: The guide roller that feeds the paper picks up the dry ink from the paper.
Treatment 1: Move the guide wheel to the side or to the blank, or to a lighter place.
Handling 2: The surface of the “S u p e r B l u e” can be added to the transfer cylinder to reduce the transfer marks.
Handling 3: If the transfer tube is solid, use anti-staining or anti-sanding paper to keep the wet ink from the paper.
Handling 4: Redesign the printed page to allow enough space for the guide rollers to guide the paper.
1 2 . Difficulties in collecting paper
Reason 1: The printing water supply stretches the printed surface of the printing paper, causing the lower roll, and the excessive wetting causes the thin printing paper to be wound up.
Treatment 1: Minimize the wetness of the surface. Use alcohol or substitutes to reduce the humidity.
Handling 2 : Use a paper anti-roller.
※ Note: If the above methods still cannot solve the problem, you should contact the paper manufacturer.
Cause 2: The paper ends are curled, making the end papers inoperable because of the heavy print on the back end of the paper.
Treatment 1: Reduce ink viscosity.
Treatment 2: Reduce the pressure roller pressure as much as possible.
Treatment 3: Avoid designing heavy prints on the trailing end.
Handling 4: Replace the paper and peel off the faster blanket.
Handling 5 : Install the paper squeegee.
Cause 3: The paper is not in place when it reaches the front or gate, or the front bump is too heavy to produce a curl.
Handling: When the press is running at normal speed, adjust the cam to release the paper in time, but when the press has a slow down mechanism, it is not necessary to adjust, because the paper baffle will make the paper position just right.
Cause 4: The vacuum absorber at the rear of the delivery tray is blocked by dusting, so it does not work.
Treatment 1: Remove the vacuum suction roller.
Treatment 2: Check the operation of the dusting system.
Cause 5: The paper is stuck together due to static electricity during paper delivery.
Handling 1: Install a commercial static eliminator before the paper is discharged.
Treatment 2: Make the relative humidity of the printing room higher than 3 5 %.