Disappearance of extrusion instabilities in brass capillary dies
We have extruded a linear low-density polyethylene through capillary dies fabricated from stainless steel and brass. We confirm a result first reported by Ramamurthy [Ramamurthy, A. V., “Wall Slip in Viscous Fluids and Influence of Materials of Construction,” J. Rheol. 30, 337–357 (1986)]: sharkskin...
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| Veröffentlicht in: | Journal of Rheology 1999-03, Vol.43 (2), p.435-442 |
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| container_title | Journal of Rheology |
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| creator | Ghanta, Venu G. Riise, Brian L. Denn, Morton M. |
| description | We have extruded a linear low-density polyethylene through capillary dies fabricated from stainless steel and brass. We confirm a result first reported by Ramamurthy [Ramamurthy, A. V., “Wall Slip in Viscous Fluids and Influence of Materials of Construction,” J. Rheol. 30, 337–357 (1986)]: sharkskin can be eliminated by the use of a brass die. We also find a substantially enhanced throughput from the brass die relative to the stainless-steel die at stresses in the range where sharkskin is observed with the latter. Finally, the large pressure oscillations and periodic extrudate distortions observed in the “slip–stick” region with stainless steel are absent with brass, where the transition to the “upper branch” of the flow curve is more gradual. |
| doi_str_mv | 10.1122/1.550988 |
| format | Article |
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We confirm a result first reported by Ramamurthy [Ramamurthy, A. V., “Wall Slip in Viscous Fluids and Influence of Materials of Construction,” J. Rheol. 30, 337–357 (1986)]: sharkskin can be eliminated by the use of a brass die. We also find a substantially enhanced throughput from the brass die relative to the stainless-steel die at stresses in the range where sharkskin is observed with the latter. 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We confirm a result first reported by Ramamurthy [Ramamurthy, A. V., “Wall Slip in Viscous Fluids and Influence of Materials of Construction,” J. Rheol. 30, 337–357 (1986)]: sharkskin can be eliminated by the use of a brass die. We also find a substantially enhanced throughput from the brass die relative to the stainless-steel die at stresses in the range where sharkskin is observed with the latter. Finally, the large pressure oscillations and periodic extrudate distortions observed in the “slip–stick” region with stainless steel are absent with brass, where the transition to the “upper branch” of the flow curve is more gradual.</description><subject>BRASS</subject><subject>CAPILLARY FLOW</subject><subject>DIES</subject><subject>EXTRUSION</subject><subject>INSTABILITY</subject><subject>MATERIALS SCIENCE</subject><subject>MELT FRACTURE</subject><subject>POLYETHYLENES</subject><subject>POLYMERS</subject><subject>RHEOLOGY</subject><subject>SHARKSKIN</subject><subject>SLIP</subject><subject>STAINLESS STEELS</subject><subject>STRESSES</subject><issn>0148-6055</issn><issn>1520-8516</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqd0M1KxDAQB_AgCtZV8BHqTQ9d89GkyU1ZP2HBi55DOk0wUpuSRNG3N0vFB_A0zPBjmPkjdErwmhBKL8mac6yk3EMV4RQ3khOxjypMWtkIzPkhOkrpDWNCZCsqdHXjk5lna6KZwNbB1fYrx4_kw1T7KWXT-9Fnb1Pp6j6alGowsx9HE7_rocyP0YEzY7Inv3WFXu5unzcPzfbp_nFzvW2ASZ4bYbnEkoHsDBiqOodVJ8C1znTKWaU6q1qgTg2yE4RBi53D1A3FYSb6XrIVOlv2hpS9TuCzhVcI02Qha0ZbRUkx54uBGFKK1uk5-vdyqSZY79LRRC_pFHqx0N0mk8u7_7KfIf45PQ-O_QAUuXK_</recordid><startdate>19990301</startdate><enddate>19990301</enddate><creator>Ghanta, Venu G.</creator><creator>Riise, Brian L.</creator><creator>Denn, Morton M.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19990301</creationdate><title>Disappearance of extrusion instabilities in brass capillary dies</title><author>Ghanta, Venu G. ; Riise, Brian L. ; Denn, Morton M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c385t-6e58083c87aca297f0976cf4fa79fe997e94c2f9d87613c40ff02fd7f0036bb83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>BRASS</topic><topic>CAPILLARY FLOW</topic><topic>DIES</topic><topic>EXTRUSION</topic><topic>INSTABILITY</topic><topic>MATERIALS SCIENCE</topic><topic>MELT FRACTURE</topic><topic>POLYETHYLENES</topic><topic>POLYMERS</topic><topic>RHEOLOGY</topic><topic>SHARKSKIN</topic><topic>SLIP</topic><topic>STAINLESS STEELS</topic><topic>STRESSES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ghanta, Venu G.</creatorcontrib><creatorcontrib>Riise, Brian L.</creatorcontrib><creatorcontrib>Denn, Morton M.</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of Rheology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ghanta, Venu G.</au><au>Riise, Brian L.</au><au>Denn, Morton M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Disappearance of extrusion instabilities in brass capillary dies</atitle><jtitle>Journal of Rheology</jtitle><date>1999-03-01</date><risdate>1999</risdate><volume>43</volume><issue>2</issue><spage>435</spage><epage>442</epage><pages>435-442</pages><issn>0148-6055</issn><eissn>1520-8516</eissn><coden>JORHD2</coden><abstract>We have extruded a linear low-density polyethylene through capillary dies fabricated from stainless steel and brass. We confirm a result first reported by Ramamurthy [Ramamurthy, A. V., “Wall Slip in Viscous Fluids and Influence of Materials of Construction,” J. Rheol. 30, 337–357 (1986)]: sharkskin can be eliminated by the use of a brass die. We also find a substantially enhanced throughput from the brass die relative to the stainless-steel die at stresses in the range where sharkskin is observed with the latter. Finally, the large pressure oscillations and periodic extrudate distortions observed in the “slip–stick” region with stainless steel are absent with brass, where the transition to the “upper branch” of the flow curve is more gradual.</abstract><cop>United States</cop><doi>10.1122/1.550988</doi><tpages>8</tpages></addata></record> |
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| identifier | ISSN: 0148-6055 |
| ispartof | Journal of Rheology, 1999-03, Vol.43 (2), p.435-442 |
| issn | 0148-6055 1520-8516 |
| language | eng |
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| source | AIP Journals Complete |
| subjects | BRASS CAPILLARY FLOW DIES EXTRUSION INSTABILITY MATERIALS SCIENCE MELT FRACTURE POLYETHYLENES POLYMERS RHEOLOGY SHARKSKIN SLIP STAINLESS STEELS STRESSES |
| title | Disappearance of extrusion instabilities in brass capillary dies |
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