| 摘要: |
| 目的 为了解决在大尺寸薄膜脉冲热封过程中， 因镍铬合金膨胀收缩导致热封质量不佳的问题。方法 通过对试生产中发生的问题进行分析， 采用理论计算与试验相结合的方法， 确定张紧机构的主要参数， 设计并研制了2种张紧机构的实物样机， 通过调试及运动过程分析， 总结了2种张紧机构的优缺点。结果 通过样机试制， 张紧机构均能在各自适用的条件下起到张紧效果， 可以根据现场实际情况进行选用， 达到设计目的， 解决了脉冲热封镍铬合金膨胀收缩的问题。结论 将张紧装置II型安装至4 m长脉冲热封机压头结构的两端， 明显改善了镍铬合金张紧效果， 消除了因镍铬合金受热膨胀导致的热封质量不佳的情况， 减少了因加热部件损坏带来的停工损失， 提高了生产效率。 |
| 关键词: 脉冲热封 镍铬合金 张紧机构 优化设计 |
| DOI： |
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| 基金项目:上海市科委基金 （11DZ2290500）；高等学校博士学科点专项科研基金 （20100074110005） |
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| Tensioning Mechanism of Thermal Head in Pulse Heat-sealing |
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CHEN Cheng, CAO Heng, ZENG Fan-jun, HE Li-dong
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East China University of Science and Technology，Shanghai 200237，China
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| Abstract: |
| The aim of this study was to solve the problem of poor quality caused by expansion and contraction of the nickel-chromium alloy in pulsed heat-sealing process of large-size film. The problems occurred in the pre-production stage were analyzed, the main parameters of the tensioning mechanism were determined by combining the theoretical calculation and experiments, and two tensioning mechanism physical prototypes were designed and developed. And then the advantages and disadvantages of these two tensioning mechanisms were summarized through debugging and analysis of physical movement. The trial of the prototype showed that both tensioning mechanisms could play a tensioning effect under the respective conditions, and could be selected according to the actual situation, which achieved the purpose of design, and addressed the problem about the expansion and contraction of nickel-chromium alloy in pulsed heat sealing. When the tensioner type II was attached to the ends of the head structure in 4 m pulsed heat-seal machine, the tensioning effects of nickel-chromium alloy were significantly improved, the poor heat-sealing quality problem caused by thermal expansion of the nickel-chromium alloy was eliminated, and the downtime losses caused by the fault of heating component were reduced, thus improving the production efficiency. |
| Key words: pulse heat-sealing nickel-chromium alloy tensioning mechanism optimized design |
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