一种软包装边角式折叠成型结构与工艺研究

目的针对现有热成型真空包装产品出现的下膜不能预印刷以及需要贴标签等问题,探讨设计一种软包装折叠成型的包装结构及工艺。方法采用边角式折叠成型方式,该包装结构由上下膜组成,下膜通过边角折叠点封固定,同时对下膜进行参数化设计。结果得出了纵向折叠收缩量与折角成正切函数关系,当折角取90°时,纵向折叠收缩量最大;获得了推压折角与折角的函数关系,结果显示折角比率一定时,随着推压折角的增加,折角逐渐减小。结论解决了边角式折叠参数关系,并提供了一种折叠工艺方案,流程为纵向折叠成型—边角折叠—横向折叠成型—边角点封定型—充填产品—抽真空热封和模切,为进一步实现产品的自动化包装和生产提供理论支撑。

Corner Folding Forming Structure and Process of a Flexible Package

The work aims to discuss and design a packaging structure and process formed by folding the flexible packaging, aiming at the problem that the lower film of the existing thermoformed vacuum packaging product cannot be pre-printed and need to be labeled. In the method of corner folding forming, the packaging structure was composed of upper and lower films. The lower film was fixed by corner folding point, and the parametric design of lower film was conducted. The tangential function relationship between the longitudinal folding shrinkage and the folding angle was obtained. When the folding angle was 90°, the longitudinal folding shrinkage was the largest. The functional relationship between the pushing angle and the angle was obtained. The resulted showed that, when the ratio of the folding angle was constant, the folding angle gradually decreased with the increase of the pushing angle. The relationship between the corner folding parameters is solved and a folding process scheme is provided. The process includes longitudinal folding forming, corner folding, lateral folding forming, corner sealing, filling products, vacuum heat sealing and die cutting. The theoretical support is provided for the realization of automated packaging and production of products.