In actual coating production, even with stable equipment operation, frequent issues that compromise product quality are unavoidable. A coating machine’s ability to quickly and accurately diagnose and resolve such problems directly determines the effective uptime of the production line and the finished product yield. Nanjing Sumino Precision Machinery Co., Ltd. has developed a systematic set of troubleshooting and solution protocols to help customers restore stable production rapidly.

Uneven Coating Thickness: Targeted Inspection from Material Feeding to Coating Head

Uneven coating thickness usually stems from two core sections: the feeding system and the coating head.

For the feeding system, inspect whether the metering pump is worn out, and check if feeding pipelines are clogged or leaking air.

For the coating head, verify the uniformity of die gaps and check the lip for damage or residual deposits.

Coating machines manufactured by Nanjing Sumino Precision Machinery are fitted with on-line thickness gauges paired with an automatic adjustment system, which monitors thickness deviations in real time and makes micro-adjustments automatically.

Surface Defects: Integrated Inspection from Slurry Preparation to Drying

Surface flaws including bubbles, orange peel texture and scratches on coatings may arise from multiple production stages. Troubleshooting steps are as follows: check if the slurry has undergone sufficient defoaming, confirm whether excessive drying temperature causes solvent bumping, and inspect air nozzles for dust buildup or foreign debris.

Our coating machines feature multi-section independently temperature-controlled ovens and adjustable air nozzles, enabling customized drying profiles tailored to different slurries.

Substrate Breakage: Rapid Diagnosis Covering Tension Control and Rollers

Substrate breakage during production leads to costly unplanned downtime. Typical root causes include excessive tension, foreign objects on roller surfaces, and inherent defects of the base material.

When troubleshooting, sequentially check tension parameter settings for all sections, surface conditions of each roller, and the quality of unwound substrate rolls.

Regular Maintenance: The Fundamental Measure for Fault Prevention

Nanjing Sumino Precision Machinery provides customers with detailed maintenance manuals and on-site technical training to assist clients in establishing a preventive maintenance system, eliminating potential faults at the early stage.