TY - JOUR
T1 - Investigation of the melting mechanism in a twin-screw extruder using a pulse method and online measurement
AU - Chen, Hongbing
AU - Sundararaj, Uttandaraman
AU - Nandakumar, K.
AU - Wetzel, Mark D.
PY - 2004/10/13
Y1 - 2004/10/13
N2 - A perturbation (or pulse) method was used to investigate the melting of a polystyrene/polypropylene (PS/PP) blend in a 40-mm twin-screw extruder (TSE). A sliding-barrel technique was used to visualize the melting processes, map the temperature and pressure profiles along the channel, and obtain the residence time distribution (RTD) at different locations in the extruder. Pressure, pulse, and visualization results were used to determine where melting occurred. Three runs with ratios of the flow rate/screw speed (Q/N) varying from 5.0 to 11.3 g/revolution were studied. It was found that the melting of the PS/PP blend in the TSE had three distinct regions. Most of the melting occurred in a narrow transition region (∼50 mm) from the partially filled region to the fully filled region. The location of the transition region was found using four different techniques: visualization, pressure, temperature, and combined pulse/RTD methods. High-speed video of the extrusion processes shows that the solid polymer pellets melted through an "erosion" mechanism. Mechanical energy consumption for melting can be obtained through this perturbation method.
AB - A perturbation (or pulse) method was used to investigate the melting of a polystyrene/polypropylene (PS/PP) blend in a 40-mm twin-screw extruder (TSE). A sliding-barrel technique was used to visualize the melting processes, map the temperature and pressure profiles along the channel, and obtain the residence time distribution (RTD) at different locations in the extruder. Pressure, pulse, and visualization results were used to determine where melting occurred. Three runs with ratios of the flow rate/screw speed (Q/N) varying from 5.0 to 11.3 g/revolution were studied. It was found that the melting of the PS/PP blend in the TSE had three distinct regions. Most of the melting occurred in a narrow transition region (∼50 mm) from the partially filled region to the fully filled region. The location of the transition region was found using four different techniques: visualization, pressure, temperature, and combined pulse/RTD methods. High-speed video of the extrusion processes shows that the solid polymer pellets melted through an "erosion" mechanism. Mechanical energy consumption for melting can be obtained through this perturbation method.
UR - http://www.scopus.com/inward/record.url?scp=4944234401&partnerID=8YFLogxK
U2 - 10.1021/ie049650s
DO - 10.1021/ie049650s
M3 - 文章
AN - SCOPUS:4944234401
SN - 0888-5885
VL - 43
SP - 6822
EP - 6831
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 21
ER -
