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- 저자 : Rebecca Ruckdashel (검색결과 1 건)
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Hollowness Variation with Die Wall Thickness in Melt-Spinning of Polypropylene Hollow Fibers
Rebecca Ruckdashel,심은경 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
A hollow fiber poses great potential as it can provide superior performance at low weight and low cost. Its uniqueproperties come from its geometry, the presence of void and air inclusion, but controlling it is a challenging problem. Thisstudy explores how the geometry of a die influences fiber hollowness. Fibers were extruded from dies with four segmentedarcs, 4-C, which had varying die wall thickness and constant inner diameter. The effects of die wall thickness on wall-shearrate, solidification, spinnability, and hollow fiber geometry are evaluated under various processing conditions. Bothprocessing parameters and die wall thickness influence hollow fiber dimensions and hollowness, but die wall thickness hasthe largest impact. Reduction of die wall thickness decreases fiber wall thickness, increases the outer and inner diameter, andincreases hollowness. It can be explained by higher die hollowness and faster extrudate solidification. However, the thinnestdie shows reduced spinnability.
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