The effects of dosages of the scouring agent and caustic soda,pad-batch hours,and steaming time on pretreatment of pure cotton knit fabric through the open width cold pad-batch-short-steaming process were investigated and the process was optimized. The hydrogen peroxide decomposition rates at dif-ferent stages were mainly analyzed. The experiment results showed that the percentage of decomposition of hydrogen peroxide at different stages varied widely. The key of process was to control a suitable amount of decomposition of hydrogen peroxide at cold pad-batch stage. The optimized process conditions were: 8 g/L of scouring agent DM-1390,4 g/L of DM-1404,12 g/L of NaOH,36 g/L of 30% H2O2,4 h of cold pad-batch time,and steaming for 10 min.%从精练剂用量、烧碱用量、冷堆时间、汽蒸时间对纯棉针织物平幅冷堆-短蒸前处理工艺进行了优化,重点对双氧水在不同阶段的分解率进行了分析.结果表明:双氧水在不同阶段的分解率存在很大差异,合理控制冷堆阶段的双氧水分解率是工艺控制的关键,并得出较合理的工艺条件:冷堆精练剂DM-1390 8 g/L、双氧水稳定剂DM-14044 g/L、NaOH 12 g/L、30％的H2O236g/L,冷堆4h,汽蒸10 min.
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