Laser perforations are formed in packaging to control the rate of gas exchange and maintain a balance between the respiration of the product and the permeation of the package. The air permeability of the packaging materials is typically measured using air-driven methods, but these do not allow for online measurement during the rapid production of perforations. The required permeability is generally obtained through trial and error. This paper describes the simulation of air-driven methods through computational fluid dynamics to study the effects of turbulence on the rate of air flow through perforations. A mathematical model is developed to quantify the influence of the microperforated size, the total area of exchange, and the thickness of the material on air permeability under certain temperature and pressure differences. The numerical results are in good agreement with the experimental results. An optical system based on the model is designed for the online inspection of packaging materials during the rapid production of laser perforations. Air permeability is precisely determined by analyzing continuous images of the perforations. Perforation characteristics such as shape, quantity, and density can also be measured to allow for feedback control of the perforation process according to the features of the packaged products. The validity and accuracy of the developed system are experimentally verified.Laser perforations are formed in packaging to control the rate of gas exchange and maintain a balance between the respiration of the product and the permeation of the package. The air permeability of the packaging materials is typically measured using air-driven methods, but these do not allow for online measurement during the rapid production of perforations. The required permeability is generally obtained through trial and error. This paper describes the simulation of air-driven methods through computational fluid dynamics to study the effects of turbulence on the rate of air flow through perforations. A mathematical model is developed to quantify the influence of the microperforated size, the total area of exchange, and the thickness of the material on air permeability under certain temperature and pressure differences. The numerical results are in good agreement with the experimental results. An optical system based on the model is designed for the online inspection of packaging materials during the r...

中文翻译：

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激光穿孔包装材料透气性在线光学检测

在包装中形成激光穿孔，以控制气体交换速率，并保持产品呼吸和包装渗透之间的平衡。包装材料的透气性通常使用空气驱动方法测量，但这些方法不允许在快速生产穿孔期间进行在线测量。所需的渗透率一般通过反复试验获得。本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于在激光穿孔快速生产过程中对包装材料进行在线检测。通过分析穿孔的连续图像来精确确定透气性。还可以测量穿孔特性，例如形状、数量和密度，以便根据所包装产品的特征对穿孔过程进行反馈控制。通过实验验证了所开发系统的有效性和准确性。在包装中形成激光穿孔以控制气体交换速率并保持产品呼吸和包装渗透之间的平衡。包装材料的透气性通常使用空气驱动方法测量，但这些方法不允许在快速生产穿孔期间进行在线测量。所需的渗透率一般通过反复试验获得。本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 但这些不允许在快速生产穿孔期间进行在线测量。所需的渗透率一般通过反复试验获得。本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 但这些不允许在快速生产穿孔期间进行在线测量。所需的渗透率一般通过反复试验获得。本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 所需的渗透率一般通过反复试验获得。本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 所需的渗透率一般通过反复试验获得。本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 本文描述了通过计算流体动力学模拟空气驱动方法，以研究湍流对通过穿孔的气流速率的影响。开发了数学模型来量化微孔尺寸、总交换面积和材料厚度在一定温度和压力差下对透气性的影响。数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。... 数值结果与实验结果吻合良好。基于该模型的光学系统设计用于包装材料的在线检测。...