top roll 11 the second rotational force is imparted directly to the top roll 11 by frictional surface engagement with the bottom roll in much the manner associated with sizing low pressure squeeze apparatus of the prior art if the present sizing squeeze apparatus 10 is operated at relatively low squeeze loadings for example 10 30 pli the amount of frictional slippage in surface drive of the top roll 11 and the change in circumference of the top roll due to rubber deformation are relatively negligible as squeeze loading pressures are increased so does slippage and an increased amount of torque must be supplied from the drive chain 36 to maintain the desired rotation of the top roll 11 moreover the top roll 11 undergoes substantial rubber strain when subjected to relatively high squeeze loading and the rubber strain distorts the surface of the top roll by increasing the effective circumference of the top roll this increase in effective circumference of the top roll 11 decreases the axial velocity at which the top roll is rotated by peripheral engagement with the driven bottom roll 12 this underdrive or decrease in the velocity of rotational drive due to the increase in effective circumference combined with the increased slippage of the surface drive at higher squeeze loadings causes the velocity of.