Draw resonance is a flow instability seen in polymer drawing processes such as melt spinning of fibres, cast film casting, and film blowing. When the draw ratio (the ratio between the take-up speed and the speed of the melt as it leaves the die) exceeds a critical value, the cross-section of the moving filament or film stops being steady and instead oscillates periodically with time, producing a regular thick-thin pattern down the line.
Draw resonance is a flow instability seen in polymer drawing processes such as melt spinning of fibres, cast film casting, and film blowing. When the draw ratio (the ratio between the take-up speed and the speed of the melt as it leaves the die) exceeds a critical value, the cross-section of the moving filament or film stops being steady and instead oscillates periodically with time, producing a regular thick-thin pattern down the line.
Source: Wikipedia "Draw resonance" · CC BY-SA 4.0
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