Fibre formation techniques polymer spinning

As non-degradable polyesters are quite common as textile materials, it comes as no surprise that their degradable counterparts are also readily processable into fibres. Polymer fibres are particularly interesting for biomedical applications, including wound dressings, controlled-release formulations and tissue engineering. Several spinning techniques result in the formation of polymer fibres. 

Polymers owe much of their attractiveness to their ease of processing. In many important techniques, sueh as injection moulding, fibre spinning and film formation, polymers are processed in the melt, so that their flow behaviour is of paramoimt importance. Because of the viscoelastie properties of polymers, their flow behaviour is much more complex than that of Newtonian liquids for which the viscosity is the only essential parameter. In polymer melts, the recoverable shear compliance, which relates to the elastic forces, is used in addition to the viscosity in the deseription of flow [48]. 

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