Studies on positive conveying in helically channeled single screw extruders

A solids conveying theory called double-flight driving theory was proposed for helically channeled single screw extruders. In the extruder, screw channel rotates against static barrel channel, which behaves as cooperative embedded twin-screws for the positive conveying. They turn as two parallel arc...

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Main Authors: L. Pan, M. Y. Jia, Z. M. Jin, K. J. Wang, P. Xue
Format: Article
Language:English
Published: Budapest University of Technology 2012-07-01
Series:eXPRESS Polymer Letters
Subjects:
Online Access:http://www.expresspolymlett.com/letolt.php?file=EPL-0003162&mi=cd
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spelling doaj-2f3102816d714186b8b3f7ae4e217d6e2020-11-24T22:39:12ZengBudapest University of Technology eXPRESS Polymer Letters1788-618X2012-07-016754356010.3144/expresspolymlett.2012.58Studies on positive conveying in helically channeled single screw extrudersL. PanM. Y. JiaZ. M. JinK. J. WangP. XueA solids conveying theory called double-flight driving theory was proposed for helically channeled single screw extruders. In the extruder, screw channel rotates against static barrel channel, which behaves as cooperative embedded twin-screws for the positive conveying. They turn as two parallel arc plates, between which an arc-plate solid-plug was assumed. By analyzing the forces on the solid-plug in the barrel channel and screw channel, the boundary conditions when the solid-plug is waived of being cut off on barrel wall, were found to have the capacity of the positive conveying. Experimental data were obtained using a specially designed extruder with a helically channeled barrel in the feeding zone and a pressure-adjustable die. The effects of the barrel channel geometry and friction coefficients on the conveying mechanism were presented and compared with the experimental results. The simulations showed that the positive conveying could be achieved after optimizing extruder designs. Compared with the traditional design with the friction-drag conveying, the throughput is higher while screw torque and energy consumption are decreased. Besides, the design criteria of the barrel channel were also discussed.http://www.expresspolymlett.com/letolt.php?file=EPL-0003162&mi=cdProcessing technologiesPlastics moldingScrew extrusion
collection DOAJ
language English
format Article
sources DOAJ
author L. Pan
M. Y. Jia
Z. M. Jin
K. J. Wang
P. Xue
spellingShingle L. Pan
M. Y. Jia
Z. M. Jin
K. J. Wang
P. Xue
Studies on positive conveying in helically channeled single screw extruders
eXPRESS Polymer Letters
Processing technologies
Plastics molding
Screw extrusion
author_facet L. Pan
M. Y. Jia
Z. M. Jin
K. J. Wang
P. Xue
author_sort L. Pan
title Studies on positive conveying in helically channeled single screw extruders
title_short Studies on positive conveying in helically channeled single screw extruders
title_full Studies on positive conveying in helically channeled single screw extruders
title_fullStr Studies on positive conveying in helically channeled single screw extruders
title_full_unstemmed Studies on positive conveying in helically channeled single screw extruders
title_sort studies on positive conveying in helically channeled single screw extruders
publisher Budapest University of Technology
series eXPRESS Polymer Letters
issn 1788-618X
publishDate 2012-07-01
description A solids conveying theory called double-flight driving theory was proposed for helically channeled single screw extruders. In the extruder, screw channel rotates against static barrel channel, which behaves as cooperative embedded twin-screws for the positive conveying. They turn as two parallel arc plates, between which an arc-plate solid-plug was assumed. By analyzing the forces on the solid-plug in the barrel channel and screw channel, the boundary conditions when the solid-plug is waived of being cut off on barrel wall, were found to have the capacity of the positive conveying. Experimental data were obtained using a specially designed extruder with a helically channeled barrel in the feeding zone and a pressure-adjustable die. The effects of the barrel channel geometry and friction coefficients on the conveying mechanism were presented and compared with the experimental results. The simulations showed that the positive conveying could be achieved after optimizing extruder designs. Compared with the traditional design with the friction-drag conveying, the throughput is higher while screw torque and energy consumption are decreased. Besides, the design criteria of the barrel channel were also discussed.
topic Processing technologies
Plastics molding
Screw extrusion
url http://www.expresspolymlett.com/letolt.php?file=EPL-0003162&mi=cd
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AT pxue studiesonpositiveconveyinginhelicallychanneledsinglescrewextruders
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