【作者】 黄金宝； 王芳； 都婧； 汤克勇；

【Author】 HUANG Jinbao;WANG Fang;DU Jing;TANG Keyong;College of Materials Science and Engineering,Zhengzhou University;

【机构】 郑州大学材料科学与工程学院；

【摘要】 在皮革的加工过程中,存在各种各样的机械作用对皮革的结构与性能产生众多影响。其中循环拉伸十分常见,有可能使皮革的结构和性能产生与在恒定环境条件下不同的变化。然而关于它对皮革力学性能的影响却鲜有报道,机理尚不清楚。本文对复鞣加脂过的坯革在干燥过程中进行平行动态拉伸(力平行于脊背线)、垂直动态拉伸(力垂直于脊背线)和交替动态拉伸(力在平行于脊背线和垂直于脊背线方向交替施加),研究了循环应力对皮革力学性能的影响。结果表明,干燥时持续拉伸可以大幅度提高其拉伸强度而降低其断裂伸长率,动态拉伸则使皮革拉伸强度和断裂伸长率更均衡,拉伸时间越长,成革强度越高。更多还原

【Abstract】 Different mechanical processes are applied in leather making,affecting the structure and property of leather.Cyclic stress is very popular and it may cause different changes of leather compared with that of constant stretching.However,only very few researches may be found on the relationship between mechanical process and leather properties.In this work,wet blue was glutaraldehyde,retanned,and MK fatliquored to get crust leathers,and cyclic stresses(stresses parallel and vertical to backbone and stresses alternating between two directions) were applied in the following drying.The mechanical properties of the resultant leathers were investigated.It was indicated that constant stress in drying can significantly improve the tensile strength and reduce the elongation at break.Cyclic stress may make a balance between strength and elongation.The longer the stress is applied,the higher the tensile strength would be.更多还原