Apparatus for measuring adhesion of gelled polymers

摘要

An apparatus for measuring adhesion of a gelled polymer to a surface comprises a support having a low friction contact surface spaced apart from a clamp used to hold a blade. The blade has a knife-edge aligned in a horizontal plane with which the blade makes an angle of less than 25°. A block, having a planar contact face in the horizontal plane, is adapted for sliding contact with the low friction contact surface of the support. An adhered layer of the gelled polymer has an adhesive bond to the planar contact face to form an interface therewith. The apparatus includes a connection, such as a wire or string, from the block to a motion generator to produce vertical motion of the connection. A force-measuring gauge is included with the motion generator. Use of a motion converter, such as a rotary pulley, alters the vertical movement of the connection to a horizontal movement to move the block along the support towards the clamp. This causes the knife-edge to penetrate the interface to disrupt the adhesive bond between the layer of gelled polymer and the planar contact face. The force-measuring gauge indicates the strength of the adhesive bond as the gelled polymer passes over the blade.