Frictional force frictional behavior ON test method and its test equipment null of tape and

摘要

PURPOSE:To conduct a test including a means for judging the pass or fail of lubrication on the surface of tape highly accurately by winding the tape around a rotating cylinder, fixing one end of the tape through an elastic body having a specified spring constant, and applying a constant tensile force on the other end. CONSTITUTION:Video tape 1 is wound around the outer surface of a cylinder 2 so that the side of the magnetic layer is in contact with the surface. Cloudy tape 3 is connected to one end of the tape 1. The tape 3 is connected and fixed to a spring 4 whose spring constant is 100 g/mm or less and which is connected to a fixing end 5. Constant tensile force is applied with a weight 6 to the other end of the tape 1. Then, the cylinder 2 is rotated and driven. Light is projected from a light source system 6 to a suitable region including the connecting part of the tapes 1 and 3. The image of the transmitted and scattered light is projected on an image sensing system 8. The displacement of the tape 1 is obtained based on the ratio between the bright part of the tape 3 and the dark part of the tape 1. Thus the frictional force and the frictional behavior are tested.