A nonplugging annulus control valve for extrusion of polymers and slurries

Persistent Link:
http://hdl.handle.net/10150/276855
Title:
A nonplugging annulus control valve for extrusion of polymers and slurries
Author:
Wong, Joseph Man, 1959-
Issue Date:
1986
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
An annular control valve was developed for the extrusion of wood slurries and polymers. The objective was to determine the optimal valve geometry: (1) to provide a linear pressure drop across the valve as a function of valve opening and (2) to eliminate the problem of valve plugging caused by the high solid content of the wood slurries. The approach was to model the non-Newtonian flow in a plasticating single-screw extruder. A finite-difference scheme was developed to model the flow through annular surfaces. The two flow equations were solved simultaneously and a parametric study was performed to determine the optimal valve geometry. The valve operability was evaluated for the extrusion of various mixtures of low-density polyethylene, sawdust, wood flour, and vacuum bottom. The experimental results were in good agreement with the model. In general, a linear valve characteristic was observed and the problem of valve plugging was not evident.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Valves.; Polymers -- Extrusion.; Wood waste -- Recycling.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Chemical Engineering
Degree Grantor:
University of Arizona
Advisor:
White, Donald H.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleA nonplugging annulus control valve for extrusion of polymers and slurriesen_US
dc.creatorWong, Joseph Man, 1959-en_US
dc.contributor.authorWong, Joseph Man, 1959-en_US
dc.date.issued1986en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractAn annular control valve was developed for the extrusion of wood slurries and polymers. The objective was to determine the optimal valve geometry: (1) to provide a linear pressure drop across the valve as a function of valve opening and (2) to eliminate the problem of valve plugging caused by the high solid content of the wood slurries. The approach was to model the non-Newtonian flow in a plasticating single-screw extruder. A finite-difference scheme was developed to model the flow through annular surfaces. The two flow equations were solved simultaneously and a parametric study was performed to determine the optimal valve geometry. The valve operability was evaluated for the extrusion of various mixtures of low-density polyethylene, sawdust, wood flour, and vacuum bottom. The experimental results were in good agreement with the model. In general, a linear valve characteristic was observed and the problem of valve plugging was not evident.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectValves.en_US
dc.subjectPolymers -- Extrusion.en_US
dc.subjectWood waste -- Recycling.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineChemical Engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorWhite, Donald H.en_US
dc.identifier.proquest1335437en_US
dc.identifier.oclc21967335en_US
dc.identifier.bibrecord.b17334421en_US
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