目的 探究模内干燥纸浆模塑制品厚度变化规律及干燥特性。方法 使用纸浆模塑成型机在不同干燥温度下，对3种不同初始厚度的纸浆模塑制品进行热压干燥实验，对实验所得产品的厚度变化和质量变化数据进行分析，并绘制干燥特性曲线。结果 纸浆模塑制品热压干燥过程可分为预压阶段、恒速干燥阶段和降速干燥阶段3个过程。在预压阶段，蓬松的纸浆模塑湿坯被模具挤压致密，厚度值出现瞬时减薄的趋势，减厚率高达40%以上，在恒速及降速阶段厚度则会逐步递减至一个平衡值。结论 根据实验结果获得了基于厚度变化的纸浆模塑制品的干燥特性。

The work aims to explore the thickness variation and drying characteristics of in-mold dried pulp molded products. The hot pressing drying experiments were carried out on three kinds of pulp molded products with different initial thickness by a pulp molding machine at different drying temperature. The thickness and quality change data of the products were analyzed, and the drying characteristic curve was drawn. The hot pressing drying process of molded pulp products could be divided into three processes:the pre-pressing stage, the constant speed drying stage, and deceleration drying stage. In the pre-pressing stage, the fluffy pulp molded wet blank was extruded and compacted by the mold, and the thickness value tended to be instantly thinned, with a thickness reduction rate of more than 40%. In the constant speed and deceleration phases, the thickness decreased gradually to an equilibrium value. According to the experimental results, the drying characteristics of molded pulp products based on thickness change are obtained.