The flow around a pirn rotating at high speed was analysed and considered by using parameters as numbers of revolutions and irn surface conditions.
The results obtained from this analysis were as followed:
1) The flow around the rotating pirn with the boundary conditions of numbers of revolutions and pirn surface conditions can be analysed.
2) The velocity vector of flow in the proposed analysis has good agreement with experiment results for the previous described conditions.
3) From the flow analysis by FEM (finite element method), we can learn contour of Stokes' stream function, vortexes and circumferential reverse flow which can't be easily obtained from experiment.

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At present the effects of NO₂ gas on textile goods are investigated using the JIS L 0855 method.
In the present study we have investigated the effects of NO₂ on carpet nylon BCF yarns when exposed to a fixed concentration of NO₂ for several hours continuously.
The results of this study showed noticable color change caused by NO₂ gas exposure in cases where the present JIS method showed no such change.
Moreover, it was recognized that the effects of NO₂ gas on dyed textile goods vary according to dye structure differences.

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