EXPERIMENTAL ESTIMATION OF WALL SLIP FOR FILLED RUBBER COMPOUNDS

The phenomenon of wall slip during flow of rubber compounds through ca pillaries is investigated for a typical styrene-butadiene elastomer wi th carbon black. It was found that at low temperature (110-degrees-C) the dependencies of slip velocity V(c) on shear stress are described b y the power law but, additionally, V(c) depends on radius of a channel . At high temperatures there is a critical shear stress below which sl iding is absent. Sliding appears only at higher shear stresses where, again, V(c) depends on shear stress and the radius of a channel.