On further correlations of exit pressure with die swell ratio

AIChE Journal ◽  
1970 ◽  
Vol 16 (6) ◽  
pp. 1087-1088 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Die Swell ◽  
Swell Ratio ◽  
Exit Pressure

Development and Application of Die Swell Data Gathering System Based on Multi-Function and all-Electric Rheometer

2013 ◽  
Vol 397-400 ◽  
pp. 1669-1672
Author(s):  
Xiang Gang Li ◽  
Yue Jun Liu ◽  
Fang Zhao ◽  
Yu Gang Huang ◽  
Yi Chen ◽  
...  
Keyword(s):  
Steady State ◽  
Force Field ◽  
Real Time ◽  
Data Gathering ◽  
Diameter Ratio ◽  
Die Swell ◽  
C Language ◽  
Rheological Behaviors ◽  
Swell Ratio ◽  
Language Data

A real-time die swell data gathering system was developed based on laser diameter gauge in order to measure the die swell of the viscoelastic materials. Software of the system is compiled by C language. Data gathering, date display, data saving and date analysis were realized. Experimental procedures were established, by which the die swell can be acquired. The laser gauge is put 5cm under the die of self-developed multi-function and all-electric rheometer (MAR) to measure the diameter of the extrudate. The rheological behaviors of the PP/PS blends are tested. The change laws of the melt die swell ratio in the condition of different frequency and amplitude were obtained. Compared with the steady-state extrusion, after introducing vibration force field, the melt die swell ratio decreases obviously. The die swell ratio of the blends decrease in fluctuation state with the increase of the frequency; while decreases gradually with the increase of the amplitude. In addition, with the die length-diameter ratio increases, die swell ratio of the blends decreases gradually.

Relationship between die swell ratio and melt flow index

1997 ◽  
Vol 52 (18) ◽  
pp. 3219-3221 ◽  
Author(s):  
A.C.-Y. Wong ◽  
J.Z. Liang
Keyword(s):  
Melt Flow Index ◽  
Flow Index ◽  
Die Swell ◽  
Melt Flow ◽  
Swell Ratio

scholarly journals Evaluation of Die Swell Behavior During Capillary Extrusion of Poly(lactic acid)/ High density polyethylene Blend Melts

2020 ◽  
Vol 2 (3) ◽  
pp. 34-42
Author(s):  
Fadi Alzarzouri ◽  
Fawaz Deri
Keyword(s):  
Shear Stress ◽  
Lactic Acid ◽  
Shear Rate ◽  
High Density Polyethylene ◽  
High Density ◽  
Poly Lactic Acid ◽  
Die Swell ◽  
Capillary Length ◽  
Swell Ratio ◽  
Polyethylene Blend

Poly lactic acid (PLA) and High density polyethylene (HDPE) have been blended   in a Brabender plastograph in the molten state. The melt die swell of the blends has been studied by using a capillary rheometer. Effects of the capillary dimensions, shear stress, shear rate, temperature and blending ratio on die swell of PLA/HDPE blend melts were investigated.    The results showed that die swell ratio decreased with increasing of capillary length and temperature while it increased with increasing of shear stress, shear rate and capillary diameter. It was also found that the plots of die swell versus blending ratio go through a maximum for blending ratio PLA/HDPE (60/40).

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