Die swell ratio of polystyrene melt from an electro-magnetized capillary die in an extrusion rheometer: effects of barrel diameter, shear rate and die temperature

2004 ◽  
Vol 15 (8) ◽  
pp. 472-480 ◽  
Author(s):  
N. Sombatsompop ◽  
S. Sergsiri
Keyword(s):  
Shear Rate ◽  
Die Swell ◽  
Polystyrene Melt ◽  
Swell Ratio ◽  
Die Temperature

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).

scholarly journals The viscoelastic properties of a halogen-free polymer composition, for cable products

2021 ◽  
pp. 67-74
Author(s):  
Olena Chulieieva ◽  
Volodymyr Zolotaryov ◽  
Volodymyr Chulieiev ◽  
Tetiana Kuleshova ◽  
Mykola Suslin
Keyword(s):  
Shear Rate ◽  
Polymer Matrix ◽  
Viscoelastic Properties ◽  
Polymer Composition ◽  
Low Density Polyethylene ◽  
Die Swell ◽  
Linear Low Density Polyethylene ◽  
Swell Ratio ◽  
Halogen Free ◽  
Melt Density

The viscoelastic properties of a halogen-free polymer composition for cable products have been investigated. The influence of temperature parameters, shear rate on the die-swell ratio of the polymer composition has been determined; the dependence of the melt density on a temperature was investigated. The polymer matrix is a mixture of polyolefins (linear low density polyethylene; polyolefin elastomer and maleic anhydride modified linear low density polyethylene) as a flame retardant filler for the polymer composition is trihydrate alumina. The content of flame retardant filler in the polymer composition is 60 %. The polymer composition was manufactured on the compounding line of X-Compound, Switzerland. The investigation of both melt density and die-swell ratio of the polymer composition has been conducted with help of capillary viscometer type IIRT-AM. To determine the density of the melt the ratio of capillary length to diameter L/D=8/2 was used. The results of the study of the dependence of the melt density of the polymer matrix from a temperature of 150–190 °C at different loads showed that this parameter decreases from 789 to 744 kg/m3 and for polymer composition from 1309 to 1268 kg/m3. The die-swell ratio in the case of an increase of the shear rate at temperatures of 150–190°C for the polymer matrix increases from 1,102 to 1,520, and for the polymer composition decreases from 1,056 to 1,018. The investigation results of the dependence of both die-swell ratio of the polymer matrix and the polymer composition on the ratio of the length of the forming tool to the diameter indicates that the die-swell ratio for the polymer matrix was reduced from 1,296 to 1,152, and for the polymer composition from 1,045 to 1,01. It was established that the viscoelastic properties of the halogen-free polymer composition are significantly influenced by: processing temperature, shear rate, melt density, the ratio of the length of the forming tool to the diameter. The research results give a possibility for a reasonable approach for the determination of technological parameters of an insulation, sheathing of power cables and optical cables of microtube construction. It will also allow to quickly adjust the geometrical parameters of the forming tool of cable heads.

Effect of Co-Monomer Content on Rheological Property of Sawdust/ABS Composites

2010 ◽  
Vol 93-94 ◽  
pp. 611-614 ◽  
Author(s):  
Poonsub Threepopnatkul ◽  
W. Teppinta ◽  
Narongrit Sombatsompop
Keyword(s):  
Molecular Weight ◽  
Shear Rate ◽  
Rheological Property ◽  
Rubber Tree ◽  
Acrylonitrile Butadiene Styrene ◽  
Die Swell ◽  
Swelling Ratio ◽  
Swell Ratio ◽  
Twin Screw ◽  
Monomer Content

Effect of co-monomer content in Acrylonitrile-Butadiene-Styrene copolymer (ABS) on the rheological property of sawdust reinforced ABS composites was investigated using capillary die rheometer. Three grades of commercial ABS resin were used. Sawdust from Para rubber tree treated with N-2(aminoethyl) 3-aminopropyl trimethoxy silane was blended with ABS by melt blending process using twin-screw extruder. From the results, shear thinning behavior was found for all of composites in the same shear rate ranges for testing that were investigated. At the low shear rate, the composites which contain higher acrylonitrile content, showed higher viscosity. At high shear rate, the viscosity of each co-monomer dependent composites tends to come close to each other on the curves. In this study, Carreau’s model was used for curve fitting and those parameters were also determined. Die swell ratio of the composites tended to increase at the initial ranges of shear rate of 10-500 s-1, and then the swelling ratio value decreased dramatically once the shear rate were further applied. The molecular weight has more effects than comonomer content on the die swell behavior i.e., at the same molecular weight, composites with higher butadiene content show higher swelling ratio.

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.

Superimposed effects in high-shear-rate capillary rheology of polystyrene melt

2012 ◽  
Vol 53 (7) ◽  
pp. 1563-1570 ◽  
Author(s):  
Wei-Sheng Guan ◽  
Han-Xiong Huang
Keyword(s):  
Shear Rate ◽  
High Shear Rate ◽  
High Shear ◽  
Polystyrene Melt

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

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
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