柔性版印刷压力检测方法研究

Research on Detection Methods of Printing Pressure in Flexographic Printing

摘要: 印刷压力是柔性版印刷工艺的核心参数，其大小与分布直接影响油墨转移效率和印刷品质量。本文主要针对柔性版印刷压力检测方法研究。首先，基于赫兹接触理论和串联等效刚度模型，建立“印版–贴版胶带”复合结构的接触压力分布模型，分析胶带超弹性对等效刚度的影响机制。其次，采用RunesKeeRP-C30-ST薄膜压力传感器厚度为0.44 mm、量程为0~30 MPa，建立动态压力检测系统，完成传感器的基本标定用此工具确定拟合决定系数为R² = 0.9976。对于传感器厚度引入的系统误差，提出滚筒间间隙补偿与刚度修正相结合的综合修正方法，使测量偏差从修正前的±7.3%降低至±2.8%。在柔性版印刷机上进行不同合压量下的实测实验，获取左、中、右三个特殊位置的压力数据，理论模型计算值与实测值相差较小，其中最大相对误差6.1%，验证了模型的有效性。研究结果为柔性版印刷工艺参数优化和质量控制提供了理论依据。

Abstract: Printing pressure is a core parameter in the flexographic printing process, and its magnitude and distribution directly affect ink transfer efficiency and print quality. This paper primarily investigates the detection methods of flexographic printing pressure. First, based on Hertzian contact theory and a series equivalent stiffness model, a contact pressure distribution model for the “printing plate-mounting tape” composite structure is established to analyze the influence mechanism of the tape’s hyperelasticity on the equivalent stiffness. A dynamic pressure detection system is developed using the RunesKeeRP-C30-ST thin-film pressure sensor (0.44 mm in thickness, with a range of 0~30 MPa), and the basic calibration of the sensor is completed, yielding a coefficient of determination for the fitting of R² = 0.9976. To address the systematic error introduced by the sensor’s thickness, a comprehensive correction method combining roller gap compensation and stiffness correction is proposed, which reduces the measurement deviation from ±7.3% before correction to ±2.8%. Experimental measurements are conducted on a flexographic printing machine under different impression settings to obtain pressure data at three specific positions: left, middle, and right. The theoretical model calculations show a small deviation from the measured values, with a maximum relative error of 6.1%, verifying the effectiveness of the model. The research findings provide a theoretical basis for the optimization of flexographic printing process parameters and quality control.