The present application provides a high-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus. The method comprises: continuously extruding a material under test as a melt, measuring and recording an inlet pressure P, a mass growth rate w, and the diameter D of a melt sample strip, and obtaining apparent shear viscosity .sub.a(t) (step A1); obtaining an outlet expansion rate (step A2); recording and displaying curves .sub.a(t) and (t), and treating the time corresponding to an increase of a set percentage on the curves as a cross-linking starting time TX (step A3); selecting a reference sample for testing, and determining a cross-linking reaction starting time TS according to .sub.a(t) and (t) curves of the reference sample (step A4); and defining an index according to Tx and Ts.

A method for measuring the properties of an anode slurry, including preparing a kneaded anode slurry, measuring an insertion length of a measuring bar, and calculating a kneading energy of the anode slurry. Specifically, the method being capable of evaluating the degree of adsorption among a conductive material, an active material, and carboxy methyl cellulose (CMC) in a kneaded state of the anode slurry.

A method for evaluating the rheological properties of at least one gel, consisting in determining the extent of the plastic domain in stress .sub.c.sub.p, and in strain .sub.c.sub.p, the determination being carried out according to the steps: subjecting at least one sample of at least one gel to oscillating mechanical stresses at a fixed frequency, determining and plotting curves of the elastic modulus G and the viscous modulus G as a function of the strain and stress, determining .sub.c and .sub.c at the point of intersection X.sub.c of the curves of G and G under stress and strain, determining .sub.p and .sub.p by fixing an arbitrary value of G (Gx) that is defined as the entry value into the plastic domain, and calculating .sub.c.sub.p and .sub.c.sub.p.