Patent ID: 6481267
Filing Date: 2002-11-19
Classification: G01N

Abstract:
A blade rheometer incorporating a measuring blade mounted for rotation about an axis, wherein the blade is of twisted form such that:a first region of the blade substantially at the axis of rotation has a first angle formed by its surface with respect to a plane perpendicular to the axis of rotation such that the surface of the blade in the first region extends substantially parallel to the axis of rotation; and a second region of the blade spaced from the axis of rotation has a second angle, different to the first angle, formed by its surface with respect to the plane perpendicular to the axis of rotation, the second angle varying with distance from the axis of rotation; and including means such that, in use, for each revolution of the blade, the blade is adapted to be displaceable by the predetermined lead distance along the axis of rotation, the second angle having a natural tangent defined as the predetermined lead distance divided by the distance of the point from the axis of rotation.