Printing machine rubber roller purchase, use and maintenance experience sharing
1. Rubber Roller Purchase Management
In response to the two failures caused by the rubber roller, several countermeasures have been proposed to ensure better performance and reliability. First, a thorough investigation and comparison of product quality from various manufacturers should be conducted. It is recommended to choose a manufacturer known for high-quality and consistent products rather than simply going for the lowest price. Second, strict acceptance criteria must be established. Using tools like micrometers and calipers, all incoming rubber rollers should be measured carefully to ensure they meet quality standards. Defective units must not be mixed in, which can save time and prevent costly machine downtime due to printing issues. Third, clear punishment measures should be set for unqualified products, serving as a warning to both the procurement department and suppliers.
2. Proper Use of Rubber Rollers
Before starting the printing process, it's essential to check for any foreign objects between the rollers, ensure the rubber roller is intact, and confirm that the pressure between the rollers is even. Cleaning should be done thoroughly before printing begins. During operation, the rubber roller should maintain consistent contact with the surface, ensuring even pressure distribution. Regardless of the print width, the entire surface of the rubber roller must be evenly coated with ink or dampening solution. Adjustments should be made based on ink and water levels to maintain print quality. To prevent ink from drying too quickly, the viscosity of the rubber roller can be slightly reduced while maintaining printing speed. When dry oil is required, its quantity must be controlled to avoid uneven ink transfer or ink buildup on the roller.
After the printing process, the rubber roller should be disengaged from the printing plate promptly to relieve pressure. This prevents deformation of the rubber surface due to static stress. Any residual ink on the roller should be cleaned immediately to avoid drying and forming ink deposits or films. Dirt adhering to the surface can damage the smoothness of the rubber, potentially leading to surface degradation or sloughing off.
3. Maintenance of Rubber Rollers
In many production environments, rubber roller maintenance is often overlooked, leading to shorter service life, higher repair costs, and challenges in maintaining print quality. Therefore, regular and proper maintenance is crucial. First, newly cast rubber rollers should not be used immediately. Their internal structure may not be stable, so it’s advisable to let them rest for a period to adapt to environmental conditions, which helps improve their flexibility and durability. Second, the bearings and shafts of the rubber roller must remain well-lubricated. Poor lubrication can cause wear on the shaft and bearing, resulting in uneven ink transfer and color inconsistency. Printing companies should regularly apply lubricant to these parts to prevent premature wear and ensure smooth operation.
Third, when the ink roller is idle and lacks an ink path clutch, an idle protectant should be applied to prevent overheating damage. Typically, this protectant lasts for 16 hours, after which it should be reapplied. Fourth, properly storing idle rubber rollers is essential. They should be wrapped in paper or plastic and placed on a roller frame, ensuring they are not under pressure. Avoid stacking or leaning them against walls, as this can lead to deformation. The storage area should be cool and well-ventilated, ideally between 10°C to 30°C with humidity between 50% and 80%. During transportation, care must be taken to avoid dropping or compressing the rollers, ensuring the core remains straight and undamaged for future refurbishment.
This content is excerpted from the journal “Printing Technology · Digital Graphic Arts†in the Science and Technology Media Journal, Issue No. 6, 2014. For more detailed information, please visit the journal section. Welcome to download the iPad version of “Keyin Journal.â€
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