Study of Rheological Behavior of Calcium Carbonate Filled Polypropylene in Dynamic Extrusion

2014 ◽  
Vol 1053 ◽  
pp. 231-234 ◽  
Author(s):  
Quan Wang ◽  
Xiao Sun ◽  
Zheng Huan Wu
Keyword(s):  
Calcium Carbonate ◽  
Vibration Frequency ◽  
Rheological Behavior ◽  
Apparent Viscosity ◽  
Polymer Melt ◽  
Measuring Apparatus ◽  
Melt Rheology ◽  
Sinusoidal Vibration ◽  
Dynamic Extrusion ◽  
Vibration Parameters

A novel rheological measuring apparatus was designed, which introduced an additional sinusoidal vibration in parallel on the extruding direction of polymer melt in this paper. Melt rheology of polypropylene filled CaCO3 particles in various amounts of filler (i.e. with 3 and 20 wt%) during capillary melt-extrusion were investigated respectively. The effects of vibration parameters on rheological behaviors were studied. Compared with the steady extrusion, the apparent viscosity of filled system decreased remarkably with the increase of vibration frequency and amplitude. The apparent viscosity reached to the minimum value as vibration frequency was about 8 Hz. When the filled percentage of CaCO3 was low, the response of apparent viscosity will be more distinct with the increasing vibration parameters.

Effects of Vibration Force Field on Extensional Stress of Polymer Melt in Contraction Die

2011 ◽  
Vol 311-313 ◽  
pp. 1114-1117
Author(s):  
Ji Chang Fan ◽  
Xiang Fang Peng
Keyword(s):  
Force Field ◽  
Vibration Frequency ◽  
Polymer Melt ◽  
Visualization Technique ◽  
Forming Process ◽  
Extensional Stress ◽  
Dynamic Extrusion ◽  
Vibration Parameters ◽  
Forming Methods

Electromagnetic dynamic plasticating extrusion, as one of main novel forming methods, has many important benefits to the forming process and the properties of its products. Here a visualization technique of flow induced birefringence was used to study the effects of the vibration parameters of screw on the extensional stress in contraction die. It is shown that , the extensional stress vibrate with the screw vibration at the same frequency; the amplitude of the extensional stress increases with the amplitude of the screw increasing; the average extensional stress at dynamic extrusion is less than that without vibration force, and it decreases with the screw vibration frequency or amplitude increasing.

Study of rheological behavior of calcium carbonate-filled polypropylene in dynamic extrusion process

2014 ◽  
Vol 36 (4) ◽  
pp. 630-634 ◽  
Author(s):  
Quan Wang ◽  
Bin Liu ◽  
Chaohua Huang ◽  
Xiao Sun
Keyword(s):  
Calcium Carbonate ◽  
Rheological Behavior ◽  
Extrusion Process ◽  
Dynamic Extrusion

Expanding the application of the van Gurp-Palmen plot: New insights into polymer melt rheology

Polymer ◽  
2018 ◽  
Vol 155 ◽  
pp. 208-217 ◽  
Author(s):  
Zhiyuan Qian ◽  
Gregory B. McKenna
Keyword(s):  
Polymer Melt ◽  
Melt Rheology

Temperature during the vibration-assisted compression of alfalfa

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 141-150
Author(s):  
Xiaoyu Wu ◽  
Shuai Yang ◽  
Chundong Song ◽  
Kun Ding ◽  
Chuanzhong Xuan ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Vibration Frequency ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Compression Time ◽  
Vibration Parameters ◽  
Reducing Energy ◽  
Compression Temperature

Compression of alfalfa into briquettes is an effective way to solve the problem of storage and transportation. In the process of compression, heat is generated and the temperature is raised in the material. In fact, the appropriate temperature can improve the quality of alfalfa briquettes and reduce the energy consumption of densification. In this study, the effect of assisted vibration on the compression temperature was tested. The results showed that when the vibration frequency was below 15 Hz, the temperature at the center and side in compressed alfalfa increased slowly with compression time. When the vibration frequency was above 20 Hz, it increased first and then decreased with the increase of time. Moreover, the maximum temperature value increased remarkably when the frequency was above 20 Hz. In the same vibration frequency and compression time, the center temperature in the compressed alfalfa was higher than the side temperature. The experimental results provide a reference for the determination of reasonable vibration parameters, and explanation of the effect of vibration on reducing energy consumption.

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