Model of Plug Flow and Equivalent Friction Coefficient in Process of Castor Beans by Single Screw Press

2014 ◽  
Vol 3 (3) ◽  
pp. 227-231 ◽  
Author(s):  
Liu Rukuan ◽  
Xu Fanglei ◽  
Xiao Zhihong ◽  
Zhang Liangbo ◽  
Li Peiwang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Plug Flow ◽  
Screw Press ◽  
Single Screw

scholarly journals Calculation of equivalent friction coefficient for castor seed by single screw press

2017 ◽  
Vol 81 ◽  
pp. 012185
Author(s):  
R. Liu ◽  
Z. Xiao ◽  
C. Li ◽  
L. Zhang ◽  
P. Li ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Screw Press ◽  
Castor Seed ◽  
Single Screw

Studies on the theory of single screw plasticating extrusion. Part II: Non-plug flow solid conveying

1991 ◽  
Vol 31 (15) ◽  
pp. 1117-1122 ◽  
Author(s):  
Shizeng Fang ◽  
Liqin Chen ◽  
Fuhua Zhu
Keyword(s):  
Plug Flow ◽  
Single Screw ◽  
Solid Conveying

N-Lamina Model of Extrusion Pressure of Non-Plug Flow Solid Conveying in Feeding Section by Single-Screw Extrusion Molding

2011 ◽  
Vol 221 ◽  
pp. 271-277 ◽  
Author(s):  
Chun Hui Liu ◽  
Jian Hua Qin ◽  
Da Li Shi
Keyword(s):  
Plug Flow ◽  
Extrusion Pressure ◽  
Powder Materials ◽  
Screw Extruder ◽  
Molding Process ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Single Screw Extruder ◽  
Screw Extrusion ◽  
Solid Conveying

While extrusion molding with single-screw extruder, extrusion pressure comes into being from feeding section; it is one of the basic conditions to ensure that extrusion process can be carried on normally, in order to ensure molding process goes smoothly, it must meet the following requirement: extrusion pressure generated during the process must be sufficient. Therefore it has certain engineering significance to design structure of a single screw correctly that a mathematical model for formation of extrusion pressure during single-screw extrusion molding will have to be established. This paper conducted a research on theory of extrusion pressure when powder of pure UHMWPE resin is still in feeding section by molding in barrel of the single screw extruder specially designed for pure UHMWPE, and established a n-lamina model of powder materials or grain materials which is in feeding section and at the state of non-plug flow solid conveying, and it provided a method to calculate extrusion pressure of the n-lamina model, thus it enriched and perfected theory of single-screw extrusion molding.

Discussion on N-Lamina Model of Non-Plug Flow Solid Conveying in Feeding Section by Single-Screw Extrusion Molding

2012 ◽  
Vol 501 ◽  
pp. 583-588
Author(s):  
Chun Hui Liu ◽  
Da Li Shi ◽  
Yan Yang Wu ◽  
Jian Hua Qin
Keyword(s):  
Compressive Stress ◽  
Plug Flow ◽  
Screw Extruder ◽  
Molding Process ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Single Screw Extruder ◽  
Screw Extrusion ◽  
Solid Conveying

This paper analyzed several important issues in theory of non-plug flow solid conveying, which is about the extrusion molding process of the single screw extruder, they are mainly: compressive stress on the front and rear ends of the surface, and ; an increase trend of compressive stress , ; pressure in feeding compression section of the screw, .

Computer simulation of three-dimensional transport during moistened defatted soy flour processing in the metering section of a single-screw extruder

2000 ◽  
Vol 214 (2) ◽  
pp. 335-349 ◽  
Author(s):  
P S Ghoshdastidar ◽  
G Ghai ◽  
R P Chhabra
Keyword(s):  
Power Law ◽  
Plug Flow ◽  
Three Dimensional ◽  
Soy Flour ◽  
Viscous Drag ◽  
Three Dimensional Model ◽  
Screw Extruder ◽  
Defatted Soy Flour ◽  
Single Screw ◽  
Single Screw Extruder

A quasi-three-dimensional steady state finite-volume-based computer model for a power-law fluid is used to describe the three-dimensional transport during the processing of defatted soy flour with 25, 28 and 33 per cent moisture contents by weight in the metering section of a single-screw extruder. The numerical results have been compared with the earlier experimental results of Fong. The results are found to be reliable only for the highest moisture content dough (33 per cent by weight). The conclusion is that the quasi-three-dimensional model showing a viscous drag flow mechanism using a power-law equation for viscosity may be effectively used for predicting the behaviour of moist doughs during the extrusion process while the same model may not be very reliable for drier doughs which show plug flow behaviour during processing.

scholarly journals Development of the mathematical model for the process of oil raw materials pressing

2018 ◽  
Vol 7 (2.13) ◽  
pp. 145
Author(s):  
Ainura Kairbayeva ◽  
Vitalii Vasilenko ◽  
Seit Dzhinguilbayev ◽  
Lyazzat Baibolova ◽  
Larisa Frolova
Keyword(s):  
Mathematical Model ◽  
Chemical Interaction ◽  
Raw Materials ◽  
Screw Press ◽  
Design Stage ◽  
Design Parameters ◽  
Single Screw ◽  
Porous Skeleton ◽  
The Mathematical Model ◽  
Oil Filtration

The mathematical model for the process of oily raw materials pressing with single-screw oil press has been developed, which makes it possible to calculate the main design parameters of an oil press for extracting oil from oil crop seeds.This model of pressing describes the process of moving meal in the pressure zone and expression of oil in the pressing cage of the screw press, taking into account the following assumptions: porous skeleton and oil have the same density, they have no chemical interaction, the process of oil filtration occurs under isothermal conditions with laminar conditions of motion.The developed mathematical model corresponds to physical meaning of the occurring phenomena and can be used to analyze the work of active presses, and at the design stage. 

Single Screw Extruder Characteristics on Friction and Heat Generated with the Barrel Carved Spiral Groove

2011 ◽  
Vol 221 ◽  
pp. 668-673 ◽  
Author(s):  
Feng Hua Tong ◽  
Da Li Shi ◽  
Jian Hua Qin
Keyword(s):  
Friction Coefficient ◽  
Solid Material ◽  
Extrusion Pressure ◽  
Frictional Heat ◽  
Spiral Groove ◽  
Screw Extruder ◽  
Frictional Heat Generation ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Exponential Increase

To make single-screw extruder with extrusion pressure enough, through theory of friction-induced extrusion pressure，which has been generally accepted in the industry. The barrel designed modular structure, in the before barrel carved groove, to add the friction coefficient between barrel and solid material. It form extrusion pressure In this section by exponential increase. This papers analyze that use of spiral groove instead of linear grooves can effectively reduce the frictional heat generation.

scholarly journals Innovative and flexible single screw press for the oil extraction of Calophyllum seeds

2019 ◽  
Author(s):  
Yuli Setyo Indartono ◽  
Heriawan Heriawan ◽  
Ika Amalia Kartika
Keyword(s):  
Moisture Content ◽  
Feed Rate ◽  
Acid Value ◽  
High Viscosity ◽  
Oil Extraction ◽  
Screw Press ◽  
Oil Yield ◽  
Oil Refining ◽  
Pressing Temperature ◽  
Single Screw

The oil extraction of Calophyllum seeds using a conventional single screw press leads to an inferior yield and is perceived to be less efficient as well as difficult to operate. An innovative and flexible single screw press was, therefore, designed and investigated in this study to solve these problems. Moreover, the effects of the seeds’ moisture content, pressing temperature and seeds’ feed rate on the oil yield and quality were identified to determine the optimal oil extraction performance from the Calophyllum seeds. The study found that the seeds’ moisture content, pressing temperature and seeds’ feed rate generally affected the oil yield. The yield indeed improved as the pressing temperature and the seeds’ feed rate increased respectively from 45 to 75°C and 1.5 to 5 kg·h<sup>–1</sup>. The oil yield also ameliorated as the seeds’ moisture content rose from 1.7 to 12.8%, but it was optimal when the seeds’ moisture content was 5.5%. The best oil yield of 80.6% was, thus, obtained with the seeds’ moisture content of 5.5%, a pressing temperature of 75°C and the seeds’ feed rate of 5 kg per h. Although the quality of the crude oil was poor with a high viscosity (³ 94 mm<sup>2</sup>·s<sup>–1</sup>) and high acid value (³ 48 mg KOH/g), its density, saponification and iodine values were acceptable. After the oil refining process by degumming and neutralisation, its quality improved and met the Indonesian Biofuel Standards, except for its viscosity.

Non-Plug Solid Conveying Theory and Granule in Feeding Section by Single-Screw Extrusion Molding

2012 ◽  
Vol 501 ◽  
pp. 122-127
Author(s):  
Chun Hui Liu ◽  
Da Li Shi ◽  
Yan Yang Wu ◽  
Jian Hua Qin
Keyword(s):  
Constitutive Equation ◽  
Theoretical Basis ◽  
Soil Mechanics ◽  
Plug Flow ◽  
Main Idea ◽  
Calculation Model ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Screw Extrusion ◽  
Solid Conveying

This paper analyzed granule of non-plug flow solid conveying section, and found the theoretical basis of the calculation model of granule from soil mechanics, and derived the constitutive equation of granule in detail, etc. All this work expounds the main idea of non-plug solid conveying theory from one side, so as to get a glimpse of the theory.

Numerical Simulation of Extrusion Pressure of Non-Plug Flow Solid Conveying in Feeding Section

2011 ◽  
Vol 250-253 ◽  
pp. 4046-4051
Author(s):  
Chun Hui Liu ◽  
Da Li Shi ◽  
Yan Yang Wu ◽  
Jian Hua Qin
Keyword(s):  
Mathematical Model ◽  
Plug Flow ◽  
Extrusion Pressure ◽  
Screw Extruder ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Single Screw Extruder ◽  
Screw Extrusion ◽  
The Mathematical Model ◽  
Solid Conveying

According to the theory of extrusion pressure by molding in barrel of the single screw extruder specially designed for pure UHMWPE, extrusion pressure generated during the process must be sufficient while extrusion molding with single-screw extruder. The mathematical model for formation of extrusion pressure in feeding section during single-screw extrusion molding has been established. This paper conducted a research on theory of extrusion pressure which is part of n-lamina model of non-plug flow solid conveying in feeding section by single-screw extrusion molding.

Sign in / Sign up

Export Citation Format

Share Document