23 Major Factors Affecting Prepress Plate-Making Quality

　　Prepress plate‑making equipment accounts for a significant share of malfunctions due to external factors, which stem from a variety of causes. Consequently, solutions must be tailored to the specific circumstances. Through hands‑on maintenance experience, the author has identified common contributors to plate‑making equipment failures—factors that are intrinsically linked to equipment breakdowns. While other critical variables may also exist, a thorough analysis of these key elements can help ensure reliable operation and prompt resolution of issues. The following sections provide a brief overview:

 

　　1. Dust: Plate-making equipment, especially post‑production electro‑photographic and imagesetter systems, is highly precise machinery. Dust is its greatest adversary, capable of causing severe damage; therefore, regular cleaning is paramount in routine maintenance.

 

　　2. Oil Contamination: Due to the friction inherent in precision machinery, nearly all equipment used in Shanghai business card printing requires lubricants of varying types. Over prolonged lubrication, factors such as temperature, dust, and particulate matter generated by friction can readily lead to oil contamination, which directly causes mechanical obstruction and localized temperature increases—key contributors to equipment malfunctions.

 

　　3. Contamination: Contaminated items fall into two categories: first, oil‑based grime; second, contaminants that form when airborne debris or accumulated particulates combine with moisture during equipment operation. Initial contamination typically has little impact on the equipment, but prolonged accumulation can lead to localized damage, such as smudges or spots on the display.

 

　　4. Material Adhesion: Material adhesion is particularly pronounced in developing machines and proofing devices. During the development process, substances on the film surface undergo chemical reactions with the developer, forming deposits that readily adhere between the various rollers. Similarly, if proofing inks are not properly cleaned, they can easily stick to the ink rollers and rubber cylinders. Therefore, regular cleaning is an effective solution to prevent material adhesion.

 

　　5. Wear: Wear typically occurs in areas of frequent mechanical movement, such as the bearings of various plate‑making devices and moving screw‑type clamps. The most effective way to reduce wear is to lubricate more frequently.

 

　　6. Vibration: Vibration can not only cause equipment malfunctions but may also compromise product quality. After ensuring proper installation, it is essential to regularly verify the equipment’s stability and levelness.

 

　　7. Loosening: In most cases, loosening is caused by external factors, such as equipment vibration. During routine maintenance, be sure to check the tightness and secure fastening of all screws.

 

　　8. Leakage: Refers to the external escape of protective fluid from within components of prepress equipment due to aging or impact, leading to elevated component temperatures and subsequent damage—for example, the circulating cooling water inside the lamp of the SCREEN P‑641‑FW duplicator.

 

　　9. Corrosion: Most volatile liquids cause varying degrees of damage to non-metallic equipment, and substances that adhere to the equipment surface and are not promptly removed are the primary cause of corrosion.

 

　　10. Creep: The creep process is generally not easily observable, as it can manifest in both mechanical and electronic domains; therefore, during equipment testing, attention should be paid to even minor changes in device parameters.

 

　　11. Stress-Induced Deformation: Stress-induced deformation is a physical phenomenon that more often occurs in equipment during operation. After work is completed, failure to perform timely adjustments can be a significant factor contributing to mechanical and circuit-board‑slot deformation.

 

　　12. Scratches: During operation, equipment may sustain scratches due to impacts from external objects. Such scratches can directly lead to serious equipment malfunctions and may also compromise product quality, for example, scratches on the rollers of electric sorting machines.

 

　　13. Cracks: The primary cause of cracking is the prolonged exposure of equipment to significant pressure or gravitational forces. Once cracks appear, repairs are generally not recommended to prevent the development of secondary cracks that could further damage the equipment.

 

　　14. Heat Generation: After electronic devices are powered on, they typically generate heat; similarly, metal components also produce heat due to mechanical friction. Electronic devices require auxiliary cooling systems to manage heat, whereas metallic parts rely on their inherent thermal conductivity to dissipate heat. During routine equipment inspections, it is essential to monitor the degree of heat generated by the device.

 

　　15. Abnormal Sounds: During operation, mechanical equipment may emit unusual noises due to factors such as heat and wear. Such sounds necessitate prompt shutdown for inspection and maintenance; otherwise, the fault may escalate.

 

　　16. Short Circuit: Short circuits are often accompanied by damage to other components, and they typically result from component aging, human error, or similar factors. After a short circuit occurs, do not immediately apply power; instead, carefully identify the root cause of the fault before performing a powered‑on test.

 

　　17. Poor Insulation: Equipment aging and heat generated during operation can both degrade the insulating properties of insulation materials. Poor insulation can lead to short circuits. When performing maintenance or replacing components or wiring, ensure that the design incorporates as much margin as possible.

 

　　18. Conduction obstruction: This refers to the phenomenon where, during operation, a conductor, electronic switch, relay, or similar component—affected by voltage, current, and contact resistance—exhibits no current flow after its movable parts have actuated. Conduction obstruction can generally be detected by applying power and performing a test.

 

　　19. Fatigue: Equipment should be operated with adequate rest periods. Prolonged, uninterrupted operation leads to fatigue in all components, and many failures are directly attributable to this phenomenon. Although many devices are rated for continuous operation, performance will be more stable if they are allowed to rest for 1–2 hours each day.

 

　　20. Rusting: Like corrosion, rusting is a form of degradation, but it occurs specifically on metallic materials. Rusting is closely associated with metals; its most obvious manifestation is the formation of rust on metal surfaces, which can impair equipment performance. Moreover, many pieces of equipment suffer from rusting at moving parts due to insufficient lubrication and protective coatings.

 

　　21. Degradation: The process by which a device’s performance and parameters are lost during operation is referred to as degradation. This degradation manifests itself in the form of overloading, and it is also related to the device’s electrical‑performance design.

 

　　22. Poor Lubrication: Insufficient oil supply or excessively high local oil temperatures are both indicators of inadequate lubrication. Poor lubrication leads to direct metal-to-metal friction, resulting in mechanical failures and, ultimately, wear.

 

　　23. Degradation: When a component’s performance is significantly altered—due to inherent quality issues or exposure to electrical surges, for example—rendering it inoperable, this phenomenon is referred to as degradation. During repairs, always take precise measurements when replacing components to ensure that no degraded parts inadvertently cause secondary failures in the circuit.