Lithographic printing rolls are the main components of their ink path systems. The ink roller is mainly used to transfer and transfer ink to the printing plate evenly during printing. The rubber roller of the waterway system is mainly used for uniform transfer and application of dampening water during printing (printing roller includes: ink transfer roller, ink distribution) Roller, inking roller, water bucket roller, water roller). Whether it is a water roller or an ink roller, its quality directly affects the quality of the product. Proper use and maintenance of the rubber roller not only guarantees the quality of the product, but also prolongs the service life of the rubber roller. This article analyzes and discusses the various causes of damage to the rubber roller, and fundamentally finds a solution. I hope you can benefit from it! If there is any irregularity, please criticize and correct.
1. Damage caused by smashing, bumping, falling or scratching
Hazard level: ★★★★★
Analysis of the cause: irreversible permanent damage or roll deformation of the roll surface material
Solution: Master the correct method of use and packaging transportation, handle gently and carefully, scratch and scratch.
2, damage caused by long time lying on the shelf
Hazard level: ★★★★★
Analysis of the reasons: one is that the flat body is permanently deformed due to the influence of gravitation; the other is that the multiple rubber rollers are flat and pressed to cause the surface colloidal compression deformation, which affects the rubber resilience.
Solution: The storage rubber roller should be placed vertically. It is best to use a blackout paper after cleaning, and then vertically support the shaft for storage. The distance between the rollers should not be less than 5mm.
3. The machine stops for a long time, and the embossed marks of the roller and the roller are pressed against each other.
Hazard level: ★★★★
Analysis of the cause: Long-term shutdown, traces caused by static pressure between the roller and the roller (especially the water roller).
Solution: Loosen the adjusting screws between each other or remove the roller.
4, the damage caused by the installation is not in place
Hazard level: ★★★
Cause analysis: Installation and debugging are not in place.
Solution: Correct installation and reasonable debugging.
5, the use of improper cleaning agent causes the rubber roller to expand (swell)
Hazard level: ★★★★
Analysis of causes: Erosion caused by chemical agents such as strong acids, strong bases, and aromatic compounds.
Solution: Wash with the correct solvent. Such as alcohol, special cleaning agents, etc.
6. Adjust the damage caused by excessive pressure between the roller and the roller.
Hazard level: ★★★★
Cause Analysis:
(1) Rubber roller shaft bearing wear, clearance or bearing "catch".
(2) The pressure of the rubber roller is too large and uneven, especially when the pressure is heavy at one end, it is easy to cause the rubber roller to wear.
(3) The core of the roll core is bent, and the manufacturing process of the shaft head burr is not standardized.
(4) The mechanical block of the ink road is worn and the card is stuck. The rubber roller should be used under the condition that the equipment is in good condition. The deformation of the mechanical equipment or parts cannot be compensated by the adjustment of the rubber roller.
Solution: Maintain the good lubricity of the rubber roller shaft bearing, check the flexibility of the bearing regularly, check the rubber roller pressure regularly every week, and repair the ink road carrier.
7. Damage caused by the machine idling (5000-15000r/h)
Hazard level: ★★★★
Analysis of the cause: When the equipment is idling for a long time, because there is no ink or water between the rubber rollers for lubrication, because the lateral movement of the squeezing rollers is not closed or stopped, the ink rollers will dry together and cause the surface of the rubber roller to heat up. damage.
Solution: Turn off the squeezing roller while using the "empty paste" on the idling unit. ,
8. Damage caused by garbage, dry ink, ink, foreign matter, etc. in the machine
Hazard level: ★★★★
Cause analysis: There are paper scraps and foreign objects in the machine.
Solution: Keep the rubber roller clean, pay special attention to check the foreign matter accumulated on the heavy roller with the smallest diameter, and maintain it regularly.
9. When the machine is not installed in the sink, the safety shield will cause wear on the soft roller at both ends of the sink roller.
Hazard level: ★★★
Analysis of the cause: The safety guard covers the sink roller at both ends and causes wear.
Solution: Turn the sink roller to close, install the sink, and then lower the safety shield.
10, PS plate installation is not in place to wear
Hazard level: ★★★
Analysis of the cause: Because the PS version is not installed properly, the plate is not fully inserted, causing the PS plate to be deformed or broken, not in place, or the PS plate is not easy to wear due to the untensioned portion. The roller is easily worn; Rule or do other logos.
Solution: Install the new plate correctly; do not use the sharp weapon to scratch the PS version.
11. Paper powder and sand on the surface of the paper and calcification on the surface of the paper wear on the surface of the rubber roller
Hazard level: ★★★★
Analysis of the cause: The rubber roller is not in place, and the ink and paper powder mixture accumulates on both ends of the rubber roller to form a layer of deposit. Long-time high-speed printing can cause crush damage to the rubber roller.
Solution: Regular deep maintenance cleaning, use the ink roller cleaning paste to clean the surface of the rubber roller, and use the reducing cream to maintain and remove the calcium.
12, rubber roller delamination, degumming, foaming
Hazard level: ★★★★★
Analysis of the cause: The production process of the rubber roller is defective or the process does not meet the standard requirements.
Solution: Replace the rubber roller.
13. Damage caused by glaze, brightening and calcification of the roll surface
Hazard level: ★★★★
Analysis of the cause: Prolonged non-maintenance causes glaze, brightening, calcification and other problems on the roll surface.
Solution: Maintain the rubber roller once for at least three months.
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