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Indexed by:期刊论文

Date of Publication:2017-10-01

Journal:MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS

Included Journals:Scopus、SCIE、EI

Volume:23

Issue:10

Page Number:5093-5104

ISSN No.:0946-7076

Abstract:In the paper, the effects of die swell and gas flow rate of polymer multi-lumen micro tubes on the design of the cross-section of the multi-lumen die are investigated mainly. On the one hand, the effects of die swell on the design of the cross-section of the extrusion die are studied on the basis of the function of die swell, extrusion velocity and length-diameter ratio of the die. After analysis, it is found that the die swell phenomenon is obvious especially when the micro tube is extruded with larger wall thickness at a higher extrusion velocity, which may lead to the deformation of the extruded tube. For extrusion of micro tubes with a well-defined shape, there is a need to optimize the geometries of the die accordingly to compensate this deformation. According to the analysis, a double-lumen and a five-lumen micro extrusion die are designed and manufactured separately. On the other hand, the extrusion experiments on the effects of gas flow rate of polymer multi-lumen micro tubes on the design of the cross-section of the multi-lumen die are conducted using the extrusion dies. Considering the effects of die swell and the gas flow rate of extrusion processes on the tubes, it is found that a well-defined multi-lumen micro tube can only be successfully fabricated by combining all the three factors including the effect of die swell, gas flow rate and optimization of the cross-section of the extrusion die.