聚酯熔体过滤器清洗技术优化

Optimization of polyester melt filter cleaning technology

仪化公司某生产线熔体过滤器正常生产时聚酯的L值为85~86,存在当切换过滤器后,聚酯的L值下降至78,降等持续5~6 h的问题。为缩短聚酯产线降等的时间,对清洗后的滤芯进行了表征,在现有三甘醇清洗工艺的基础上,增加了超声和酸洗工序。研究显示超声可以清除金属纤维表面的难溶垢,硝酸不适用于滤芯的清洗,而柠檬酸或者磷酸清洗后的滤芯可以使切换后聚酯的色相上升至至少82,表明增加的工序优化了滤芯的清洗效果。

The L value of polyester in Yihua company’s production line is 85/86,but there is a problem that when the melt filter is switched,the L value of polyester drops to 78 and lasts for 5~6 h.In order to solve this problem,the cleaned filter element was characterized.Based on the existing triethylene glycol cleaning process,ultrasonic and pickling processes were added.The research shows that ultrasonic can remove the insoluble scale on the surface of metal fiber,nitric acid is not suitable for the cleaning of filter element,but the filter element cleaned by citric acid or phosphoric acid can make the hue of the switched polyester rise to at least 82,indicating that the added process can optimize the cleaning effect of the filter element.