皮革在不同整饰阶段的顶伸蠕变性能变化

Variational Regularity of Leather Creep Property under Lastometer Deformation in Different Finishing Processes

皮革在干加工阶段的一系列操作,对皮革最终的蠕变性能产生了很大影响。对经过各个加工操作后皮革的蠕变性能进行了研究;以皮革的蠕变应变函数ε(t)和蠕变推迟时间τ表征皮革蠕变性能的变化。试验结果表明:经过各种干加工操作后的皮革遵循修正广义Kelvin模型;随着加工强度的增加,皮革的蠕变推迟时间τ呈现不同的变化趋势,振软、拉软、滚软等操作使得皮革的τ值变大,绷板和涂饰操作使得皮革的τ值变小。皮革的蠕变推迟时间τ与皮革的尺寸稳定性有一定的相关性。

Leather mechanical properties were changed during the dry processes, leading to the variation of final leather creep properties. Based on systematic experiment and study in each dry process, the variation of leather creep property was characterized by the creeping strain function of leather e （t） and the creeping delay time π. The experimental results show that the creeping strain function of leather ε（t） under lastometer deformation after each process, still conforms to modified Kelvin models. As the increase of intensity, the creeping delay time τ shows different variation trends. The value of τ is respectively increased after vibration staking, staking and milling, the value of τ is respectively decreased after toggling and finishing. So the value of ,r of leather has a certain correlation with dimension stability of leather.