Why air bubble mix with polymer in melt spinning?

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Md Washim Akram

https://www.sciencedirect.com/search/advanced?qs=air%20bubble%20mix%20with%20polymer%20in%20melt%20spinning

Antonella Battisti

Sometimes bubbles appear due to thermal degradation of the polymers. This can be a temperature-related problem, but provided that your process takes place within the correct T and P conditions, it can also be caused by excessive shear stress. The extrusion screw may apply excessive shear stress to your polymer, causing local overheating and degradation.