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.

Abstract: A method and a device for simulating a larger width of felt/wire than the real one in a hot air plant for heat treatment of the felt/wire avoids a temperature drop towards the edges and of achieving a homogeneous temperature treatment all over the width of the felt/wire. Along the edges of the felt/wire adjustable sheetlike members or roller blinds are provided in the heating zone.

Abstract: An assembly for treatment of an endless wire or felt which passes around a support roll comprises a transversely elongated support frame, rails, means at each end of the frame for movable support of the frame on the rails into and out of a surrounding position in relation to the support roll, and a roll which is transversely disposed within the frame, as well as means for holding the roll in the frame in such a position within the frame that at a first surrounding position of the frame in relation to the support roll the frame roll obtains contact with the felt on the support roll and at a second surrounding position of the frame in relation to the support roll the frame roll obtains contact with a free section of the felt adjacent the support roll. The roll on the frame can be heated and has a drive motor for rotary movement of the roll about its longitudinal axis.

Abstract: An assembly for heat treatment of a papermaking wire or felt comprises mutually opposing heating surfaces that are alternately offset in the direction of web travel and can be moved toward the felt/wire, thereby enabling one to obtain an ironing effect on both sides of the web simultaneously. The heating surfaces may constitute parts of respective box members whose interiors are formed for being heated by a heat medium, for example, hot oil.

Abstract: A roller having channels in the roller shell for a flow medium. The roller has an inner, tight, homogeneous shell, an outer shell, and intermediate ribs projecting out from the inner shell and sealed to both inner and outer shells to form the said channels.

Abstract: A stretching machine for treating removable belts supported on rollers, such as felts and wires in paper-making machines. The stretching machine comprises two rollers over which the belt is suspended, at least one of said rollers being adapted to be heated. A lifting device is inserted between the heatable roller and the belt, such that the belt can be held raised up from the roller.