FFS重膜印刷机收卷部双锥度张力控制方法

A Double Taper Tension Control Method for Winding of FFS Heavy-film Press

目的解决FFS重包装膜在高速印刷过程中带卷过大所引起的卷膜中心处皱折和端面不齐等产品质量问题。方法提出一种双锥度张力控制方法,通过对收卷张力和辊筒压力分别采用锥度张力控制来有效控制卷膜内部张力的分布,令卷膜内部张力分布更加均匀。基于等效张力的概念,对卷膜中的单元体进行受力分析,得到卷膜受力和卷膜自身张力的变化规律。建立卷膜张力的数学模型,对双锥度控制方法的性能进行理论分析。结果通过集成到设计的平台上,对所提出方法的有效性进行验证,实验结果表明该方法使收卷张力更加稳定,可减少卷膜内层抓心变形,产品合格率提高至98%以上。结论实验结果验证了所提出方法和研制装置的有效性,可有效解决产品出现的质量问题。

The work aims to solve the product quality problems like wrinkles at the center of rolling film and the uneven end face caused by excessively large winding coil when the FFS heavy packaging film was printed at a high speed. A method of double taper tension control was proposed. The distribution of tension inside the rolling film was effectively controlled by means of taper tension control applied on the winding tension and roller pressure, which made the tension inside the rolling film distributed more evenly. The stress analysis was carried out on the unit in the rolling film. Accordingly, the stress and tension change law of rolling film were obtained. The mathematical model of rolling film tension was established, and the performance of double taper control method was analyzed theoretically. Integrated into the design platform, the effectiveness of the proposed method was verified. The experimental results showed that the method enabled the winding tension to be more stable, which could reduce the inner heart deformation of rolling film and improve the product percent of pass to over 98%. The effectiveness of the proposed method and the developed platform is validated by the experiment results, and the product quality problem incurred can be solved effectively.