Abstract: A series of studies on the rheological behavior of LDPE melt were carried on, so as to provide the optimal spinning parameters to prepare the LDPE fiber. The study used RHEOGRAPH 25 75 of by GOETTFERT company of the Germany. The influences of shear rate，shear stress and temperature on the flow properties of LDPE pipe were investigated by using capillary rheometer at different temperature． The research result is that: the melt shear flow obeyed roughly the power law; the dependence of the melt apparent shear viscosity on the temperature corresponded approximately with the Arrhenius equation; The non-Newton exponent of LDPE is 0.498 when extrusionspinning is carried out at the temperature of 205 oC , which is most close to the Newton liquid . The activation energy of LDPE is between 10 and 13 J/P mol, when spinning performed at 150~250 oC , which decreases with the increasing of the shear rate. the melt apparent shear viscosity of LDPE pipes decreased nonlinearly with the increase of shear rate and shear stress?.

Key words: LDPE resin, capillary rheometer, rheological proterty, spinnability