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Melt Film Adhesion Dynamics on Spinning Wheels

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In this paper, melt film dynamics in rock wool spinning machines are investigated. High-speed visualization of the melt film structure was performed for a model spinning wheel and two industrial spinning machines. The quality of the melt film adhesion to the wheel and related heat transfer parameters were assessed by time series analysis of the image gray level for different operating conditions. During the warmup procedure for the spinning wheels investigated in laboratory experiments, the best wetting of the wheel surface (i.e.with least voids in the melt film) was observed at the lowest rotational speed and melt viscosity. In this transitional period, melt adhesion can be improved by preheating of the wheel surface and by gradual increase of the wheel rotational speed. Once the wheel surface has reached its working temperature, melt temperature and viscosity seem to have the largest effect on the melt adhesion process. The cooling rate of the melt film was observed to increase with its initial temperature and circumferential velocity. Regardless of the operating regime, no significant melt slippage against the wheel surface was observed, with melt film structure preserved over multiple spinner wheel rotations.
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Document Type: Research Article

Publication date: February 1, 2019

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