目的 分析食品多层包装内包缺陷产生的原因，降低食品生产过程中内包装的缺陷率。方法 以GDXII包装机为例，分析造成褶皱、破损、翘边、露底、划痕和拼接错误等6种典型内包铝箔纸缺陷的原因，分别对GDXII包装机的内包夹紧装置、压花装置、切割装置、加速装置及包装成型装置进行参数调整。结果 调整优化后的GDXII包装机在生产时，机器运行稳定，单小时内包生产量由优化调整前的23 977提升至24 350，内包铝箔纸缺陷率由调整前的4.44%降低至1.92%。结论 在实际生产中，同类食品包装生产企业可以根据该优化调整思路及方法，确定与之适应的包装机参数调整方案，以降低生产过程中内包缺陷损耗率，提升产品信誉度和企业经济效益。

The work aims to analyze the causes for the defects in the inner packaging of multi-layer food package to reduce the defect rate of the inner packaging in the food production process. Taking GDXII packaging machine as an example, the causes of six typical defects of inner packaging aluminum foil paper, such as wrinkles, breakage, warping, exposed bottom, scratches and stitching errors, were analyzed, and the parameters of inner packaging clamping device, embossing device, cutting device, acceleration device and packaging molding device of GDXII packaging machine were adjusted respectively. The adjusted and optimized GDXII packaging machine was running stably during production, with the production volume of the inner packaging increased to 24,350 from 23,977 before optimization and adjustment, and the defect rate of the inner packaging aluminum foil paper decreased to 1.92% from 4.44% before adjustment. In actual production, similar food package manufacturers can determine the appropriate parameter adjustment scheme of packaging machine according to the optimization and adjustment ideas and methods, so as to reduce the loss rate of inner packaging defects in the production process, and improve the credibility of products and the economic benefits of enterprises.