DEVELOPMENT OF ON-LINE NEAR-INFRARED SPECTROSCOPY SENSOR FOR POLYMER PROCESSINGS

近红外光谱传感器是为聚合物加工，特别是聚合物超临界CO_2发泡而研制的。该传感器可以监测溶解在熔融聚合物中的发泡剂如CO_2、丁烷和酒精的浓度。将研制的近红外传感器安装在发泡挤出机上，通过测量近红外光谱，可以在线测量熔融聚合物中的发泡剂浓度。该传感器还可推广应用于发泡注射成型机中，在发泡注射成型机中，可将CO_2气体同时引入模腔和模筒中。新的表面涂层技术是使用注塑机新发明的。

The near infrared (NIR) spectroscopy sensor was developed for polymer processing uses, especially, polymer foaming with supercritical CO_2. The sensor can monitor foaming agents dissolved in the molten polymers such as CO_2 and butane concentrations as well as alcohol. It can also measure the diffusion process of low molecular components and CO_2 in molten polymer.By installing the developed NIR sensor at the foaming extruder, where physical foaming agents are introduced to make polymeric foams, concentration of foaming agents dissolved into the molten polymer could be measured on-line from the NIR spectra. The sensor is also extended to use for the foaming injection molders, where the CO_2 could be introduced to both cylinder and cavity in the molder. The new surface coating techniques was newly invented using the injection molder.