An experimental apparatus for measurement of elongational flow properties for LDPE melt and the effect of testing conditions

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

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รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Sitticharoen W., Intawong N., Sombatsompop N.

ผู้เผยแพร่: SAGE Publications

ปีที่เผยแพร่ (ค.ศ.): 2010

วารสาร: Polymers and Polymer Composites (0967-3911)

Volume number: 18

Issue number: 7

หน้าแรก: 359

หน้าสุดท้าย: 368

จำนวนหน้า: 10

นอก: 0967-3911

eISSN: 1478-2391

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-80051802186&partnerID=40&md5=08947109c34d2793d522a7ec4f2620fc

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

An experimental rig was designed and constructed for melt strength measurement and was assembled at the end of a single screw extruder used for the production of low-density polyethylene (LDPE) melt. The experimental rig was coupled with a high speed data logging system and a personal computer for the real-time measurement of melt strength. The molten LDPE was extruded through a capillary die, forming a continuous filament before being pulled down by speed-adjustable mechanical rollers until the filament failed. A digital camera was used for measuring the actual extrudate size at failure point. The drawdown forces as a function of volumetric flow rate from the extruder, roller speed, die temperature and take-up style were of interest in this study. It was found that the experimental rig could be used for accurate measurement of the mechanical strength for the LDPE melt. The experimental results suggested that the melt strength of LDPE was dependent upon the volumetric flow rate through the die from the screw extruder, roller speed, and the take-up style. For ladder-step take-up, increasing roller speed resulted in non-linear increases in the drawdown forces, the drawdown force changes being associated with the molecular disentanglement and elastic resistances of the branched LDPE melt. The drawdown forces of the LDPE melt measured under the rapid speed take-up method were 40-60% greater than those tested under the ladder-step speed take-up method, depending on the volumetric flow rate used in the screw extruder. The tensile viscosity of the LDPE melt was found to decrease slightly with strain rate and die temperature in the testing conditions used in this work. ฉ 2010 Smithers Rapra Technology.

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