Polypropylene/polystyrene/clay blends prepared by an innovative eccentric rotor extruder based on continuous elongational flow: Analysis of morphology, rheology property, and crystallization behavior

2017 ◽  
Vol 63 ◽  
pp. 73-83 ◽  
Author(s):  
Ting Wu ◽  
Ding Yuan ◽  
Feng Qiu ◽  
Rong-yuan Chen ◽  
Gui-zhen Zhang ◽  
...  
Keyword(s):  
Crystallization Behavior ◽  
Flow Analysis ◽  
Elongational Flow ◽  
Eccentric Rotor ◽  
Rheology Property

Morphology, rheology property, and crystallization behavior of PLLA/OMMT nanocomposites prepared by an innovative eccentric rotor extruder

2017 ◽  
Vol 29 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Ting Wu ◽  
Yuru Tong ◽  
Feng Qiu ◽  
Ding Yuan ◽  
Guizhen Zhang ◽  
...  
Keyword(s):  
Crystallization Behavior ◽  
Eccentric Rotor ◽  
Rheology Property

Modelling of Shear Viscosity Behavior and Extrusion through Dies for Rubber Compounds

1987 ◽  
Vol 60 (2) ◽  
pp. 337-360 ◽  
Author(s):  
James L. White ◽  
Yeh Wang ◽  
Avraam I. Isayev ◽  
Nobuyuki Nakajima ◽  
Frederick C. Weissert ◽  
...  
Keyword(s):  
Cross Sections ◽  
Shear Viscosity ◽  
Flow Analysis ◽  
Elongational Flow ◽  
Extrudate Swell ◽  
Pressure Losses ◽  
Analysis And Design ◽  
Rubber Compounds ◽  
Viscosity Behavior ◽  
Active Research

Abstract This paper marks a first effort to develop a fundamental basis for die flow analysis and design for rubber compounds. We have accomplished a modelling of the shear viscosity function and its application to one- and two-dimensional shearing in die cross sections. There are major limitations in what we have done, much of which is apparent even in the early work of Mooney. In particular, we have not considered (i) slip phenomena on die walls, (ii) die entrance and exit pressure losses associated with converging and diverging dies, nor (iii) extrudate swell. We have an active research in our laboratories investigating these problems. In the future, we are seeking to generalize the procedures described in this paper to more complex die designs. Inclusion of entrance and exit effects and rigorous analysis of coathanger dies requires the handling of elongational flow contributions, a still unsolved problem.

Application of Computational Fluid Dynamics Analysis for Rotating Machinery—Part II: Labyrinth Seal Analysis

2005 ◽  
Vol 127 (4) ◽  
pp. 820-826 ◽  
Author(s):  
Toshio Hirano ◽  
Zenglin Guo ◽  
R. Gordon Kirk
Keyword(s):  
Research Work ◽  
Flow Analysis ◽  
Labyrinth Seal ◽  
Bulk Flow ◽  
Working Fluid ◽  
Leakage Flow ◽  
Labyrinth Seals ◽  
Eccentric Rotor ◽  
Computational Fluid Dynamics Analysis ◽  
Force Components

Labyrinth seals are used in various kinds of turbo machines to reduce internal leakage flow. The working fluid, or the gas passing through the rotor shaft labyrinth seals, often generates driving force components that may increase the unstable vibration of the rotor. It is important to know the accurate rotordynamic force components for predicting the instability of the rotor-bearing-seal system. The major goals of this research were to calculate the rotordynamic force of a labyrinth seals utilizing a commercial CFD program and to further compare those results to an existing bulk flow computer program currently used by major US machinery manufacturers. The labyrinth seals of a steam turbine and a compressor eye seal are taken as objects of analysis. For each case, a 3D model with eccentric rotor was solved to obtain the rotordynamic force components. The leakage flow and rotor dynamics force predicted by CFX TASCFlow are compared with the results of the existing bulk flow analysis program DYNLAB. The results show that the bulk flow program gives a pessimistic prediction of the destabilizing forces for the conditions under investigation. Further research work will be required to fully understand the complex leakage flows in turbo machinery.

scholarly journals Elongational Flow and Crystallization Behavior in Supercooled Melt Polymer

Seikei-Kakou ◽  
1995 ◽  
Vol 7 (9) ◽  
pp. 576-581 ◽  
Author(s):  
Hiroshi ITO ◽  
Takashi KAWAMURA ◽  
Jun-ichi TAKIMOTO ◽  
Kiyohito KOYAMA
Keyword(s):  
Crystallization Behavior ◽  
Elongational Flow ◽  
Supercooled Melt

Application of CFD Analysis for Rotating Machinery: Part 2 — Labyrinth Seal Analysis

2003 ◽  
Author(s):  
Toshio Hirano ◽  
Zenglin Guo ◽  
R. Gordon Kirk
Keyword(s):  
Research Work ◽  
Flow Analysis ◽  
Labyrinth Seal ◽  
Bulk Flow ◽  
Working Fluid ◽  
Leakage Flow ◽  
Labyrinth Seals ◽  
Eccentric Rotor ◽  
Force Components ◽  
Unstable Vibration

Labyrinth seals are used in various kinds of turbo machines to reduce internal leakage flow. The working fluid or, the gas passing through the rotor shaft labyrinth seals, often generates driving force components that may increase the unstable vibration of the rotor. It is important to know the accurate rotordynamic force components for predicting the instability of the rotor-bearing-seal system. The major goals of this research was to calculate the rotordynamic force of a labyrinth seals utilizing a commercial CFD program and to further compare those results to an existing bulk flow computer program currently used by major US machinery manufacturers. The labyrinth seals of a steam turbine and a compressor eye seal are taken as objects of analysis. For each case, a 3D model with eccentric rotor was solved to obtain the rotordynamic force components. The leakage flow and rotor dynamics force predicted by CFX TASCFlow are compared with the results the existing bulk flow analysis program DYNLAB. The results show that the bulk flow program gives a pessimistic prediction of the destabilizing forces for the conditions under investigation. Further research work will be required to fully understand the complex leakage flows in turbo machinery.

Blown Film of m-LLDPE Using a Novel Eccentric Rotor Extruder

2018 ◽  
Vol 783 ◽  
pp. 28-33
Author(s):  
He Zhi He ◽  
Shi Ming Liu ◽  
Lan Ya Cheng ◽  
Yi Ping Ni ◽  
Feng Xue ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Physical And Mechanical Properties ◽  
Elongational Flow ◽  
Screw Extruder ◽  
Novel Device ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Eccentric Rotor ◽  
The One

Metallocene linear low-density polyethylene (m-LLDPE) has superior physical and mechanical properties. While, the film blowing processability of m-LLDPE was very poor when processed under shear flow. To overcome this drawback, a novel device based on elongational flow was self-developed to process m-LLDPE. In order to investigate the effect of elongational flow on the processability improvement of m-LLDPE, five types PE were studied in this paper. All kinds of PE were prepared using this novel device and traditional single-screw extruder with molecular weight and its distribution, mechanical properties and WAXD characterization. Gel Pemeation Chromotographer (GPC) data shows that molecular weight of each resin prepared using this novel eccentric rotor extruder (ERE) is higher than that processed by traditional single screw extruder (SSE). Mechanical properties showed that tensile properties of all kinds of films blowing from ERE is better than the one from SSE. However, tear properties of m-LLDPE films made from ERE differ from LDPE or LLDPE. And had a relative low value than the one made from SSE. In addition, Wide-angle X-ray Diffraction (WAXD) results indicate that films blowing from ERE exist a partially ordered component in addition to the usual crystalline and amorphous components which can’t be achieved from SSE.

scholarly journals Numerical Simulation of Mixing Characteristics in the Eccentric Rotor Extruder with Different Process Conditions and Structural Parameters

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
De-jun Fan ◽  
Ming-kai Yang ◽  
Zhi-gao Huang ◽  
Jin-song Wen
Keyword(s):  
Numerical Simulation ◽  
Structural Parameters ◽  
Elongational Flow ◽  
Structure Design ◽  
Process Conditions ◽  
Analysis Software ◽  
Mixing Performance ◽  
Eccentric Rotor ◽  
Computational Fluid Dynamics Analysis ◽  
Mixing Characteristics

Numerical simulation was performed with the computational fluid dynamics analysis software POLYFLOW to investigate the influence of different process conditions and structural parameters on mixing characteristics of the eccentric rotor extruder. The intensity of shear and elongational flow strengthened when the rotational speed increased, but the time for material to stay in the extruder will be reduced. At the same time, the increase of radius and eccentricity could effectively promote the mixing performance. On the contrary, the mixing capacity reduced with the increase of the pitch. The results can be useful to optimize the structure design and guide production.

scholarly journals Improved Properties of Metallocene Polyethylene/Poly(ethylene terephthalate) Blends Processed by an Innovative Eccentric Rotor Extruder

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 585
Author(s):  
He-Zhi He ◽  
Feng Xue ◽  
Bin Xue ◽  
Shi-Ming Liu ◽  
Zhao-Xia Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Flow Field ◽  
Ethylene Terephthalate ◽  
Processing Condition ◽  
Elongational Flow ◽  
Metallocene Polyethylene ◽  
Eccentric Rotor ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

In this investigation, metallocene polyethylene (m-PE) was melt blended with poly(ethylene terephthalate) (PET) with an effort to achieve improved mechanical properties using a novel eccentric rotor extruder (ERE) without the addition of any compatibilizers. The phase morphology, rheological properties, crystallization behavior, and mechanical properties of the fabricated blends were carefully studied to explore the effect of the elongational flow field on the dispersion and mixing of PET in the m-PE matrix and the interface of the two immiscible polymers. For comparison, a conventional twin-screw extruder (TSE) was used to prepare the same blends as references using the same processing condition. It shows that the elongational flow field in ERE is much more effective to disperse the immiscible PET in the m-PE matrix with a smaller particle size and a narrower particle size distribution, compared to the shear flow field in TSE. A compatibilizer, ethylene-co-methyl acrylate-co-glycidyl methacrylate (E-MA-GMA), was added to the m-PE/PET blends during the processing using TSE and ERE. It was observed that the improvement of the tensile property by adding the compatibilizer is marginal for the m-PE/PET blends processed using ERE, which indirectly proves the high effectiveness of the elongational flow field on the enhancement of the dispersion and mixing of PET in the m-PE matrix and the interface interaction.

scholarly journals Recent Advances in Elongational Flow Dominated Polymer Processing Technologies

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1792
Author(s):  
Zhongke Yuan ◽  
Xiaochuan Chen ◽  
Dingshan Yu
Keyword(s):  
Elongational Flow ◽  
Polymer Processing ◽  
Product Performance ◽  
New Method ◽  
New Techniques ◽  
Processing Technologies ◽  
Recent Advances ◽  
Eccentric Rotor ◽  
Material Systems ◽  
Processing Techniques

The continuous development of plasticizing conveying methods and devices has been carried out to meet the needs of the polymer processing industry. As compared to the conventional shear-flow-dominated plasticizing and conveying techniques, a new method for processing polymers based on elongational flow was proposed. This new method and the related devices such as vane extruders, eccentric rotor extruders and so on, exhibited multiple advantages including shorter processing time, higher mixing effectiveness, improved product performance and better adaptability to various material systems. The development of new techniques in the field of polymer material processing has opened up a broad space for the development of new plastic products, improved product performance and reduced processing costs. In this review, recent advances concerning the processing techniques based on elongational flow are summarized, and the broad applications in polymer processing as well as some future opportunities and challenges in this vibrant area are elucidated in detail.

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