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首页> 外文学位 >Property optimization of stretch blow molded PET containers and prediction of container properties from PET film data.
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Property optimization of stretch blow molded PET containers and prediction of container properties from PET film data.

机译：优化拉伸吹塑PET容器的性能，并根据PET薄膜数据预测容器的性能。

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In the two-stage or the reheat-and blow process for the manufacture of PET containers, the preform is heated to the appropriate orientation temperature by infrared heaters before being blown into a bottle. There is a nonuniform temperature distribution through the preform thickness as well as in the axial direction. Since the preform is quite thick (about 150 mils), there is significant difference in the inside and outside hoop stretch ratios. This variation in temperature and hoop ratio through the thickness of the preform causes varying amounts of orientation to be induced through the thickness of the container. In this work, it was proposed to study the effects of nonuniform temperature distributions on the functional properties of blown containers.; The temperature profile through the preform thickness, was computed from process conditions by solving the energy equation with radiation as the heating source. The computed temperature profile was verified by measuring the inside and outside preform surface temperatures using infrared thermocouples. Bottles were then blow molded with different temperature profiles through preform thickness and functional properties were determined. Thickness distributions, axial ratios, mechanical, optical and barrier properties as well as the creep behavior were studied. It was found that the optimum temperature profile depends on the property to be optimized. Mechanical properties are better for bottles blown at a lower blow temperature, while optical clarity, shrinkage, permeability and density are better when the bottles were blown at a higher temperature. Blowing with the inside surface at a higher temperature than the outside surface results in more uniform property variations through thickness and less defects and voids in the sidewall. The creep behavior of containers can be controlled by proper material distribution and higher orientation in the sidewall.; PET films were stretched on the Long Extensional Tester at various temperatures, stretch speeds and stretch ratios. The stretched films were then characterized using various techniques. Prediction of container properties using the data generated for films was undertaken and three different approaches were used. The first method involves the use of time-temperature superposition to extrapolate the film data to the extension rate and extension ratio encountered in bottle blowing. In the second method, correlations developed between functional properties and average orientation functions for films were used for the prediction of properties of blown containers. The third method was a combination of the first two methods. The birefringence was obtained by superposition and other properties were predicted using the correlation between functional properties and birefringence. With the exception of tensile energy absorption, it has been shown that mechanical properties of blown containers can be predicted from film data using any of the three methods previously described. A quantitative measure of property variation through thickness can also be obtained. Using the methods developed in this work, a map of properties and processing conditions encountered in stretch blow molding can be generated and this information can be used for designing preforms and containers.
机译：在用于制造PET容器的两阶段或再加热和吹制过程中，在吹入瓶中之前，通过红外线加热器将预成型坯加热到合适的取向温度。沿预成型件厚度以及轴向方向的温度分布不均匀。由于预成型件非常厚（约150密耳），因此内部和外部环向拉伸比存在显着差异。温度和环比在整个预型件的厚度中的这种变化引起通过容器的厚度引起的取向量的变化。在这项工作中，有人提议研究温度不均匀对吹塑容器功能特性的影响。通过求解以辐射为热源的能量方程，根据工艺条件计算出通过预成型坯厚度的温度曲线。通过使用红外热电偶测量内部和外部瓶坯表面温度来验证计算出的温度曲线。然后通过瓶坯的厚度吹塑具有不同温度曲线的瓶子，并确定其功能特性。研究了厚度分布，轴向比，机械，光学和阻隔性能以及蠕变行为。发现最佳温度曲线取决于要优化的特性。在较低吹塑温度下吹塑的瓶子的机械性能更好，而在较高温度下吹塑瓶子的光学透明度，收缩率，渗透性和密度则更好。内表面的吹气温度高于外表面的吹气导致厚度上更均匀的性能变化，并减少侧壁上的缺陷和空隙。容器的蠕变行为可以通过适当的材料分布和在侧壁上的较高方向来控制。 PET薄膜在长拉伸试验机上以各种温度，拉伸速度和拉伸比拉伸。然后使用各种技术表征拉伸的膜。进行了使用为薄膜生成的数据来预测容器性能的研究，并使用了三种不同的方法。第一种方法涉及使用时间-温度叠加将胶片数据外推到吹瓶过程中遇到的延伸率和延伸率。在第二种方法中，将薄膜的功能特性和平均取向函数之间建立的相关性用于预测吹塑容器的特性。第三种方法是前两种方法的组合。通过叠加获得双折射，并使用功能性质和双折射之间的相关性预测其他性质。除吸收拉伸能量外，已经表明，吹塑容器的机械性能可以使用前述三种方法中的任一种从薄膜数据中预测。还可以获得通过厚度的特性变化的定量测量。使用在这项工作中开发的方法，可以生成拉伸吹塑中遇到的性能和加工条件图，并且该信息可用于设计预成型坯和容器。

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