高强瓦楞原纸干燥曲线在线测量与分析

Online Measurement and Analysis of Drying Curve of a High-strength Corrugating Medium Machine

关键词:  高强瓦楞原纸  干燥部  干燥曲线

Key Words:high strength corrugating medium  drying section  drying curve

摘要:通过在线测量某高强瓦楞原纸厂干燥部不同烘缸位置湿纸幅的定量，获得纸幅干燥曲线，采用最小二乘法拟合，获得最能解释纸幅干燥过程的干燥曲线模型。利用该模型对测试对象干燥部进行分析，得到干燥曲线和各烘缸出力情况，结合纸幅温度测量数据，可知测试对象纸幅干燥过程为：纸幅加热阶段（1^#~2^#缸）、恒速干燥阶段（3^#~22^#缸）、减速干燥阶段（23^#~48^#缸）。该原纸临界含水率为0.29 g水/g（d.s.）。烘缸出力最大在8#缸位置，为29.17 kg水/(m²·h)。

Abstract:The basis weights of the web on different dryers were measured online to obtain the drying curve in the drying section of a high-strength corrugating medium machine, and a series of models were adopted to simulate the process of paper drying. The result showed that the Model 5 was the best model to describe the drying process. In addition, the Model 5 was used for drying kinetics analysis in the drying section of the paper machine, a simulated drying curve and drying rate were obtained, combining with the sheet temperature measured we could find: the paper drying process, “sheet-heating phase”(1^#~2^# cylinder); “constant rate drying phase”(3^#~22^#cylinder) and “reducing drying rate phase”(23^#~48^#cylinder). The critical moisture content was 0.29 g water/g(d.s.). The highest drying rate was 29.17 kg water(m²·h) at the cylinder 8^#.