AM05-21-006 溶融損傷抑制を目的とするスリットダイ出口部の流れ制御(非ニュートン流体2,一般講演)

概要

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In the extrusion processing of the polymer melt, the extrudate often suffers melt fracture, which is called as "sharkskin", "spiral fracture", or "wavy fracture" depending on the surface roughness. The mechanism of the "sharkskin" was proposed here by the microscopic observation of the slit exit. The polymer was linear Polydimethylsiloxane (PDMS). In order to suppress the melt fracture, the flow of slit exit was controlled by the air jet. The visualized results indicated the possibility that the effectively controlled air jet would suppress the melt fracture. In addition, we observed the difference in the exit flow by the addition of boron nitride into PDMS or the use of fluorinated slit die, which are known to be effective on suppressing melt fracture.
日本流体力学会の論文
2005-09-05