Introduction

Corrugated board printing machines are indispensable in the packaging industry. Their reliable operation directly impacts product quality and production efficiency. However, these machines are prone to various malfunctions during production. This paper delves into common breakdowns in corrugated board printing equipment, their root causes, and corresponding solutions, aiming to assist enterprises in optimizing equipment maintenance, enhancing production efficiency, and ensuring product quality.

Common Malfunctions and Their Causes

1. Inadequate Printing Pressure

   • Manifestations: Ink bars, ink dots, misregistration.
   • Causes: Wear of impression cylinder bearings, use of hard underlays, wear of gear teeth leading to increased sliding friction and uneven ink transfer.

2. Inaccurate Anilox Roll Grinding

   • Manifestations: Ink density variations, dot gain, misregistration.
   • Causes: Wear and deformation of anilox roll cells, uneven anilox pressure resulting in inconsistent ink film thickness.

3. Poor Surface Strength of Corrugated Board

   • Manifestations: Powdering, fuzzing, and pilings.
   • Causes: Delamination of the paper's coating and surface layers, resulting in insufficient surface strength.

4. Ink System Malfunctions

   • Manifestations: Ink breaks, ink density variations, ink spots.
   • Causes: Ink duct clogging, pump failure, aging of ink duct piping.

5. Transmission System Malfunctions

   • Manifestations: Unstable printing speed, misregistration.
   • Causes: Gear wear, loose or slipping belts, bearing damage.

6. Electrical System Malfunctions

   • Manifestations: Equipment failure to operate, control system failure.
   • Causes: Electrical circuit faults, sensor failures.

Solutions and Preventive Measures

• Regular Maintenance: Establish a comprehensive maintenance schedule, including regular cleaning, lubrication, and inspection of all equipment components, and timely replacement of worn parts.
• Adjust Printing Parameters: Adjust printing pressure, ink volume, speed, and other parameters according to different paper types and printed products.
• Optimize Ink System: Regularly clean the ink system, replace aging ink duct piping, and inspect the pump's operating condition.
• Maintain Transmission System: Adjust belt tension, replace worn gears, and inspect bearings.
• Inspect Electrical System: Inspect electrical connections, calibrate sensors, and replace damaged components.
• Use High-Quality Consumables: Use high-quality paper, ink, and fountain solution.
• Control Environmental Conditions: Maintain a stable temperature and humidity in the printing workshop.
• Strengthen Operator Training: Improve the skill level of operators to reduce human errors.

Recommendations for Improving Corrugated Board Printing Quality

• Use High-Quality Raw Materials: Using high-quality corrugated board and ink is the foundation for ensuring print quality.
• Optimize Process Parameters: Adjust printing pressure, ink volume, speed, and other process parameters according to different printed products.
• Strictly Control Environmental Conditions: Control the temperature and humidity in the printing workshop to avoid the impact of environmental factors on print quality.

Conclusion

Malfunctions in corrugated board printing equipment can significantly impact production efficiency and product quality. By thoroughly understanding the root causes of common malfunctions and implementing appropriate preventive and corrective measures, equipment breakdowns can be minimized, production efficiency can be enhanced, and product quality can be guaranteed. Enterprises should establish a robust equipment maintenance system, conduct regular inspections and maintenance, extend equipment lifespan, and reduce production costs.