A method for calibrating a metal profile blank configured as a hollow-chamber profile having at least one solid wall. A pressing tool is closed in a main direction about one end region of an element of the profile blank until surfaces of the pressing tool lie against a pair of surfaces of the profile blank to be calibrated, deforming and bending the at least one end region of the element. The pressing tool is closed in a secondary direction perpendicular to the main direction until surfaces of the pressing tool lie against surfaces of the at least one end region, and wedge-like limbs of a drive element of the pressing tool engage wedge-like dies of the pressing tool. The pressing tool is closed further in the secondary direction, subjecting the profile blank to plastic deformation so as to reduce or eliminate the bending of the end region.

A sticker for spacing wood is extruded from an aluminum alloy. The sticker can have different configurations. In a first configuration, the sticker has a width about the same as its height, with longitudinal ridges on all sides that grip wood when wood is stacked on the sticker. In a second configuration, the sticker has a width significantly greater than its height, with longitudinal ridges on the top and bottom surfaces, and with smooth side surfaces. The longitudinal ridges have a height within a specified range and are spaced at a distance peak-to-peak within a specified range. The ridges provide good grip of lumber stacked on the sticker yet do not easily plug with wood fibers through repeated use. The extruded aluminum sticker is very rugged and can be used for hundreds or even thousands of drying cycles.

The present disclosure is directed to a method of making a heat exchanger tube, such as multichannel tubes. The heat exchanger tube may include a plurality of generally parallel flow paths extending between opposite ends. The method may include removing a section of an outer wall along the length of the tube to expose at least some of the plurality of generally parallel flow paths.

A pre-stretching roller of an unwinding apparatus, associable to a wrapping machine, includes a main body elongated and manufactured by an extrusion process of a metal alloy. The main body includes a first tubular element having a cylindrical shape and defining an external cylindrical wall for interacting with a film, a second tubular element internal to the first tubular element and having a first end provided with a first seat suitable for coupling with a driving shaft of a driving unit and an opposite second end provided with a second seat suitable for coupling with a supporting pin for fixing the pre-stretching roller to the unwinding apparatus, and a plurality of longitudinal vanes which connect the first tubular element to the second tubular element. The second tubular element has a plurality of longitudinal ribs, each connected to a respective longitudinal vane.

The invention relates to a fluid channel for a heat exchanger, comprising a metal sheet, wherein the metal sheet has at least one core region of an aluminum base alloy and at least one structure arranged inside the fluid channel, wherein the structure lies against a surface of the metal sheet and can be soldered to the metal sheet in a flux-free manner by way of a first soldering location in a soldering operation, and wherein a soldering region of the metal sheet and a counterpart lie against one another and can be soldered to one another in the same soldering operation as a second soldering location while wetting with flux, wherein an open path between the two soldering locations exists before the soldering operation.

A folded tube for a heat exchanger is disclosed. The tube includes first and second ends for connection to first and second headers of the heat exchanger. An outer wall of the tube provides at least two channels for carrying a heat exchange fluid between the first and second headers. At least one seam is formed in the outer wall extending the length of the tube, the seam including a pair of opposed flanges extending into the tube to form the two channels, the outer wall joined together along the seam. The tube further includes a first end region and a second end region, and an intermediate region. The tube flattened along its length to form at least two flattened lobes, each lobe including one of the channels, and the lobes in the intermediate region being flatter than the lobes in at least one of the end regions.

An extruded multi-port tube for use in a heat exchanger comprises a main body extending longitudinally from a first end to a second end thereof. The main body is divided into a plurality of longitudinally extending segments. Each of the ports formed in the main body extend from the first end to the second end thereof for conveying a fluid therethrough. Each of the ports extend substantially parallel to the main body along each of the segments thereof. Both the main body and each of the ports of one of the segments are offset laterally relative to both the main body and each of the ports of an adjacent one of the segments.

An extruded material includes a peripheral wall having a closed loop-shaped cross-section and defining a hollow, and a middle rib connected to an inner peripheral surface of the peripheral wall and dividing the hollow. The extruded material is provided with a corrected portion set at a predetermined portion in a longitudinal direction and subjected to correction processing, and an uncorrected portion not subjected to the correction processing. The peripheral wall is expanded outward with respect to an original shape of the uncorrected portion in the corrected portion. While the middle rib is curved with respect to an imaginary straight line connecting connecting portions connected with the peripheral wall at both end portions of the middle rib in the uncorrected portion, the middle rib has a smaller degree of curvature than the original shape of the uncorrected portion in the corrected portion.

A method for producing a roll-clad aluminum workpiece and an associated roll-clad aluminum workpiece are provided, wherein a core ingot is produced from an aluminum alloy and at least one cladding piece is produced from a cladding material, wherein at least one groove is introduced into the core ingot and/or into a layer applied to the core ingot, wherein the cladding piece is inserted into the groove, and wherein the core ingot is hot-rolled after the cladding piece has been inserted, the width of the groove being equal to or less than the core ingot width. A use of such a roll-clad aluminum workpiece is also provided for producing a soldered workpiece, in particular a folding tube.

The invention relates to a method for producing a heat exchanger tube (1) by bending a metal strip (11), said tube (1) having an internal partition (19) formed by joining the ends of opposing edges (11a, 11b), said partition facing a projection (50) that extends into the heat exchanger tube (1) at a joining zone (22). The method comprises the following steps: locally stamping the metal strip (11) in order to produce a projection at the joining zone (22); and bending the metal strip (11) in order to form said heat exchanger tube (1), such that the projection extends into the tube (1). The invention also relates to such a tube (1) and to a heat exchanger (3) comprising a bundle of said tubes (1).