EXPERIMENTAL-STUDY OF ISOTHERMAL SPINNING OF A NEWTONIAN AND A VISCOELASTIC LIQUID

An experimental study of continuous isothermal drawing (spinning) of a Newtonian and a viscoelastic liquid has been carried out, and the results compared with viscoelastic spinning theory. The viscoelastic liquid has a nearly constant viscosity that is close to that of the Newtonian liquid. Spinning forces in the viscoelastic liquid were one to two orders of magnitude larger than those in the Newtonian liquid. Filament breakup in the viscoelastic liquid occurred at a constant stress; this stress was an order of magnitude larger than the breakup stress in the Newtonian liquid and three orders of magnitude larger than the shear modulus. Draw resonance instability occurred in accordance with predictions from stability theory for the Newtonian liquid and for the viscoelastic liquid at slow throughputs, but a delay in the onset of draw resonance at higher throughputs of the viscoelastic liquid cannot be explained in the context of existing theory. © 1979.