Abstract: A heat shield which is attached to a heatable roller in a stretching machine for the treatment of felt and wire cloths is designed to have channels for the heating medium extending in the machine direction. The ducts may be grouped in sections having a connection to an inlet and outlet manifold. Each section is attached to a by-pass. In this way a heating medium can be fed into the shield in controlled portions over the longitudinal direction of the shield thus obtaining the possibility of control and regulation of the temperature profile over the cross-section of the band.

Abstract: To obtain an enhanced evening out of differences in temperature on a roller surface, it is proposed to establish or to make a roller such that a buffer layer of oil is formed against the inside of the roller surface. This buffer layer is heated by means of a heat exchanger in which oil flows. The heat exchanger is made having open flow connection with the buffer layer.

Abstract: A stretching machine for treating removable belts supported on rollers, such as felts and wires in papermaking machines, comprises two rollers, over which the belt is trained in a loop. A heated belt contact structure has a contact surface adapted to contact the belt on the outside of the loop and between the rollers. A press roller is adapted to make press contact with the belt on the inside of the loop opposite the belt contact structure. The belt contact structure comprises a glide contact surface and a roller, the press roller acting against this latter roller.

Abstract: In an assembly for heat treatment of an endless web, comprising two rotatable rollers of which at least one roller is heatable, there is provided between the two rotatable rollers a heatable glide surface, stationary relative to the direction of movement for the web, designed to make contact with the outside of the endless web that circulates in the web loop. In this manner the web may be heat treated simultaneously on both sides. The glide surface enables the heat treatment of both sides of the web without using rollers requiring excessive space, thus also permitting the heat treatment of very short endless webs, which previously have had to be reversed and driven twice through the assembly to achieve heat treatment on both sides.