Cargando…

The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders

It has been known in the industrial sector that in closely intermeshing counterrotating twin screw extruders, large separating forces develop in the calender gap, which push the screws towards the barrel wall. The result is significant wear in the region defined by 30°- and 60°-degree angles from th...

Descripción completa

Detalles Bibliográficos
Autores principales: Demirci, Abdullah, Teke, Ismail, Polychronopoulos, Nickolas D., Vlachopoulos, John
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037425/
https://www.ncbi.nlm.nih.gov/pubmed/33804847
http://dx.doi.org/10.3390/polym13070990
_version_ 1783677140518043648
author Demirci, Abdullah
Teke, Ismail
Polychronopoulos, Nickolas D.
Vlachopoulos, John
author_facet Demirci, Abdullah
Teke, Ismail
Polychronopoulos, Nickolas D.
Vlachopoulos, John
author_sort Demirci, Abdullah
collection PubMed
description It has been known in the industrial sector that in closely intermeshing counterrotating twin screw extruders, large separating forces develop in the calender gap, which push the screws towards the barrel wall. The result is significant wear in the region defined by 30°- and 60°-degree angles from the vertical. In the present investigation, pressures were measured around the barrel in extrusion of two rigid PVC resins in a laboratory extruder of 55 mm diameter and the forces on the screw core were determined. Numerical flow simulations were also carried out using the power-law viscosity parameters of the resins. From the experimental results, it was determined that the resultant forces are in the 30 degree angle direction, and from the computer simulations, the angle is between 18° and 25°. It is argued that the resultant force angle will be somewhat larger in large diameter extruders, due to the additional contribution of gravity.
format Online
Article
Text
id pubmed-8037425
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-80374252021-04-12 The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders Demirci, Abdullah Teke, Ismail Polychronopoulos, Nickolas D. Vlachopoulos, John Polymers (Basel) Article It has been known in the industrial sector that in closely intermeshing counterrotating twin screw extruders, large separating forces develop in the calender gap, which push the screws towards the barrel wall. The result is significant wear in the region defined by 30°- and 60°-degree angles from the vertical. In the present investigation, pressures were measured around the barrel in extrusion of two rigid PVC resins in a laboratory extruder of 55 mm diameter and the forces on the screw core were determined. Numerical flow simulations were also carried out using the power-law viscosity parameters of the resins. From the experimental results, it was determined that the resultant forces are in the 30 degree angle direction, and from the computer simulations, the angle is between 18° and 25°. It is argued that the resultant force angle will be somewhat larger in large diameter extruders, due to the additional contribution of gravity. MDPI 2021-03-24 /pmc/articles/PMC8037425/ /pubmed/33804847 http://dx.doi.org/10.3390/polym13070990 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle Article
Demirci, Abdullah
Teke, Ismail
Polychronopoulos, Nickolas D.
Vlachopoulos, John
The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders
title The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders
title_full The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders
title_fullStr The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders
title_full_unstemmed The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders
title_short The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders
title_sort role of calender gap in barrel and screw wear in counterrotating twin screw extruders
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037425/
https://www.ncbi.nlm.nih.gov/pubmed/33804847
http://dx.doi.org/10.3390/polym13070990
work_keys_str_mv AT demirciabdullah theroleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT tekeismail theroleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT polychronopoulosnickolasd theroleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT vlachopoulosjohn theroleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT demirciabdullah roleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT tekeismail roleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT polychronopoulosnickolasd roleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders
AT vlachopoulosjohn roleofcalendergapinbarrelandscrewwearincounterrotatingtwinscrewextruders