This invention is used for monitoring long moulding materials which are made of rubber or thermoplastic composed of one or more kinds of mixtures with extrusion head which is fed with one or more extrusion presses and fitted with measuring devices for displaying the pressure and temp. at it's outlet. When the per meter weight of moulding band drifts from the demarcated value determined by per meter weight scale, the controller will measure the immediate extrusion pressure and extrusion temp. at the nozzel outlet and when it drifts from the immediate adjusted demarcated value, the controller will adjust the rotating speed of related extrusion press.