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Titolo:
In-process rheometry studies of LDPE compounds - Part I: Unfilled resin
Autore:
Kelly, AL; Woodhead, M; Coates, PD; Barnwell, D; Martin, K;
Indirizzi:
Univ Bradford, Dept Mech & Med Engn, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP , W Yorkshire, England Raychem Ltd, Swindon SN3 5HH, Wilts, England Raychem Ltd Swindon Wilts England SN3 5HH Swindon SN3 5HH, Wilts, England
Titolo Testata:
INTERNATIONAL POLYMER PROCESSING
fascicolo: 4, volume: 15, anno: 2000,
pagine: 355 - 360
SICI:
0930-777X(200012)15:4<355:IRSOLC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINE RHEOMETER; EXTRUSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Coates, PD Univ Bradford, Dept Mech & Med Engn, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP re, England
Citazione:
A.L. Kelly et al., "In-process rheometry studies of LDPE compounds - Part I: Unfilled resin", INT POLYM P, 15(4), 2000, pp. 355-360

Abstract

The initial part of a comprehensive study into the investigation and validation of in-process measurements on a low density polyethylene (LDPE) compound during extrusion is reported An unfilled commercial grade of low density polyethylene was processed using fully instrumented, computer monitored, single and twin screw extruders in the Interdisciplinary Research Centre (IRC) laboratories, University of Bradford. Three in-process rheometers were used; a prototype Rosand capillary on-lint rheometer (OLR), a four sensor slit die in-line rheometer (ILR) and a six sensor slit die ILR. Off-line comparisons were carried out using a Rosand RH7 twin bore capillary rheometer. All devices allowed shear flow characterisation at a range of processing rates, and the capillary rheometers also provided a measurement of entry pressure drop through the use of orifice dies. The six-sensor ILR also allowedmeasurement of entry pressure drop into the slit, although the differencesin flow geometry meant these measurements were not directly comparable with the capillary, devices, and exit pressures were extrapolated from ILR pressure drops. The in-process devices exhibited very good agreement with measurements made off-line, in both shear flow and entry pressures. In-line slit die measurements were very close to those made using capillary dies, despite the in-line tests being non-isothermal and employing a different geometry of measurement section. Differences in melt rheology between single and twin extrusion were observed, due to the amount of mechanical work input byeach extruder, Overall, good agreement was observed from the four different routes to measurement, for the LDPE examined.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 02:48:32