PET制品加工工艺、存储时间对其冲击强度的影响

The Effect of PET Products Processing Technology and Storage Time on Its Impact Toughness

摘要: 对于拥有PET合成、改性及加工的企业，进一步研究加工工艺对PET制品的性能影响，对于企业的长期发展与明确改性方向均具有重要意义。本文通过调整PET制品加工过程中螺杆温度、喷嘴温度、烘干温度及时间、模温、冷却时间等参数摸索出PET制品加工工艺要求为：“在保证产品外观合格的前提下，需低温、高压、干燥到位、尽量缩短周期；干燥温度150℃~160℃、干燥循环时间控制在5~7小时、模温12℃~15℃”。并且通过对比分析法，抽取同一时间生产制品，不同时间段测试其结晶度，得出PET制品结晶度随时间的变化规律；抽取类似加工工艺，不同存放时间PET制品，进行冲击实验，得出PET制品组装成品前的最佳储存时间，为生产的过程控制提供了依据。

Abstract: For enterprises with PET synthesis, modification and processing, further research on the impact of processing technology on the performance of PET products is of great significance for the long-term development of the enterprise and the clear direction of modification. By adjusting the parameters such as screw temperature, nozzle temperature, drying temperature and time, mold temperature, injection pressure and cooling time, the requirements of PET products processing are as follows: “in order to ensure the appearance of the product, low temperature, high pressure, control cycle; drying temperature control at 150˚C~160˚C, drying cycle control in 5~7 hours, mold temperature control at 12˚C~15˚C”. In addition, through comparative analysis, products produced at the same time were extracted and their crystallinity was tested at different time periods, and the variation law of crystallinity of PET products with time was obtained. By taking a similar processing process, PET products of different storage time perform an impact experiment. The best storage time of PET products is provided, which provides the basis for the process control of production.