Development of an in-line viscometer in an extrusion molding process

✍ Scribed by Shih-Hsuan Chiu; Hsuan-Chi Yiu; Sheng-Hong Pong

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 157 KB
• Volume: 63
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970214)63:7<919::aid-app12>3.0.co;2-m

✦ Synopsis

In this work, an in-line viscometer to measure the viscosity of polymer melts under extrusion molding processes was developed. The in-line viscometer contains a stress sensor and a shear rate sensor which were installed between the screw and the die of an extruder. In this way, the flow line after the screw cannot be changed, unlike the present in-line capillary rheometer which can change the diameter of the pipe of the flow line and hence influence the throughput. All data acquisition is done by a computer such that the melt viscosity can be calculated automatically. The shearthinning behavior of a low-density polyethylene (LDPE) under three different temperatures is presented in all experiments. It is concluded that the melt viscosity can be effectively monitored.