Abstract: Aspects of the present disclosure include a heat brush with a handle and a base. The base includes a heating surface and a bristle that has a protrusion. The protrusion may have any of several structures. Other aspects are also described and claimed.

Abstract: The present invention refers to a process for bonding flexible films by converting the surface of a first film into a softened state before contacting the softened surface with a second film, a device for carrying out the inventive process as well as a composite body obtained by the inventive process or by the inventive device.

Abstract: A heat-press system for use in the production of footwear or apparel can include at least a hollow first roll comprising an external surface and an internal surface. The internal surface can define a core. The core can include a first heating element.

Abstract: The present disclosure relates to a method of attaching a shrinkable label on at least one product wherein the shrinkable label comprises a film comprising heat shrinkable material and photothermic material, the method comprising: transporting a plurality of products on a product conveyor through an irradiation volume defined by a plurality of UV light emitters arranged sideways of the product conveyor; arranging at least one reflector between consecutive products on the product conveyor while the at least one product is being transported; controlling the UV light emitters to emit UV-light towards the shrinkable label arranged around the at least one product in the irradiation volume and towards the at least one reflector arranged between consecutive products in order for the photothermic material of the shrinkable label to heat up causing the heat shrinkable material to shrink around the at least one product.

Abstract: Embodiments of a system and a method for manufacturing a gypsum board can be used to produce a gypsum board having at least one perforated cover sheet via a cover sheet perforator system. The cover sheet perforator system can include a perforator roller is disposed downstream of a forming station along a machine direction, a roller support frame for rotatably supporting the perforator roller such that its rotational axis extends along the cross-machine direction, and a motor arranged with the perforator roller to rotate the perforator roller about the rotational axis. The drive motor can be adapted to rotate the perforator roller with a tangential speed substantially equal to the line speed to produce a series of perforation holes in an upwardly-facing cover sheet as the gypsum board moves past the perforator roller.

Abstract: A continuous-belt baking system having a pair of upper rollers rotatably mounted in frame and spaced at a first distance, a pair of lower rollers rotatably mounted in frame and spaced at a second distance, a continuous thermally-conductive belt passing over the upper rollers, a continuous thermally conductive belt passing over the lower rollers, and two arrays of radiant heating elements. The radiant arrays include a first group of heating elements above a lower run of the upper belt between said upper rollers and a second opposing group of heating elements below an upper run of the bottom belt between the lower rollers. Each heating element may be separately controlled insofar as its ON/OFF state or in accordance with temperature, to provide more localized baking capabilities.

Abstract: Embodiments provide a method and device that enables automatic selection of settings for ironing one or more pieces of fabric. A digital camera on an ironing device captures an image of a fabric. A wireless communication device on the ironing device communicates the image to a remote computing system for digital image processing to determine a fabric type and to select a set of settings based on the fabric type. The wireless communication device receives the set of settings from the remote computing system. The set of settings are applied to the ironing device.

Abstract: Embodiments provide a method and device that enables automatic selection of settings for ironing one or more pieces of fabric. A digital camera on an ironing device captures an image of a fabric. A wireless communication device on the ironing device communicates the image to a remote computing system for digital image processing to determine a fabric type and to select a set of settings based on the fabric type. The wireless communication device receives the set of settings from the remote computing system. The set of settings are applied to the ironing device.

Abstract: A radiant heating apparatus having a tube, a partial enclosure device and a heating wing. The heating wing has a wing proximal end that connects to the partial enclosure device's exterior surface. The heating wing also has a wing distal end that obliquely extends outwardly in relation to the partial enclosure device and toward a first direction. The heating wing, except at the wing proximal end, and the partial enclosure device's exterior surface are spaced apart so the heating wing re-directs second direction heat energy in the first direction.

Abstract: An apparatus for embossing a web having a static gas pressure plenum and a forming structure disposed in contact to the static gas pressure plenum. The static gas pressure plenum provides a static gas pressure of from about 0.1 MPa to about 25 MPa.

Abstract: A fixing member, including a releasing layer, wherein the releasing layer contains a fluoropolymer and a polysiloxane having a cross-linked structure, and wherein the fixing member is used in a process for heating a toner image on a recording medium to thereby fix the toner image onto the recording medium.

Abstract: A fixing member, including a releasing layer, wherein the releasing layer contains a fluoropolymer and a polysiloxane having a cross-linked structure, and wherein the fixing member is used in a process for heating a toner image on a recording medium to thereby fix the toner image onto the recording medium.

Abstract: A welding apparatus for welding a work-piece includes an energy source configured to generate a weld in a zone of the work-piece, with the work-piece characterized by a layer. The apparatus also includes a first wheel characterized by a first circumference and a first set of protrusions disposed on the first circumference, and a second wheel characterized by a second circumference and a second set of protrusions disposed on the second circumference. Each of the first and second wheels is configured to rotate relative to the work-piece, and the first and second sets of protrusions are configured to disrupt the layer as the work-piece is traversed between the first and second wheels. The energy source generates the weld in the zone of the work-piece following the disruption of the layer. A method employing the disclosed welding apparatus is also provided.

Abstract: The present invention relates to a heating device for heating rollers in a laminator including a first insulating element, a heating element, a first electricity-conductive element and a first fixing element. The first electricity-conductive element includes a first connecting hole. The heating element winds around the first insulating element. In addition, a first end of the heating element hooks and thus connects with the first electricity-conductive element after passes through the first connecting hole. The first fixing element passes through the first connecting hole and the first insulating element, so as to fix the first electricity-conductive element and the first end of the heating element on the first insulating element.

Abstract: A split crimper for use in a crimping assembly for engaging and heat sealing overlapping layers of a packaging material includes a first crimper portion having a crimping surface and a second crimper portion that is secured to the first crimper portion to form a crimper. Portions of the first and second crimper portions cooperate to define an interior cavity, and a heating element is disposed completely within the interior cavity.

Abstract: Method in which a continuous butt-sealed rim of a collar defined by corresponding concentric ends, without undulations, of a first wall, radially innermost, and a second wall, radially outermost, of a double-wall bellows is obtained as a continuous butt-weld bead on the corresponding rims, arranged radially adjacent to each other, of the ends of the first and second walls, which have been prepared such that, before welding, they are radially spaced apart from each other by not more than 0.3 mm and with the rim of the second wall that projects in an axial direction with respect to that of the first wall for a length of 0.2-0.4 mm; butt welding is performed with a laser beam directed parallel to an axis of symmetry of the collar, making the latter rotate around the axis to progressively expose the entire perimeter of the rims of the ends of the first and second walls, simultaneously pressing the rims against each other with a force between 1 and 3 kg via spring clamping rollers.

Abstract: A heater rolling pin having a roller body, stainless steel axles, hollow roller interior, roller outer surface, a handle mounted to each axle, electrical tactile switch secured to one end of the roller, a heater secured inside the roller interior, batteries and a battery holder at the opposite end of the roller. The internal heater makes the outer surface of the roller hot. The roller is manufactured from food grade aluminum alloy and is hard anodized and dyed to make the surface very hard and scratch resistant. The roller has two food quality, high density polyethylene (HDPE) plastic handles with stainless steel axles.

Abstract: A hair-styling device having an essentially cylindrical heating part on which at least one heatable styling part is provided for heating the hair. At least one lateral limit of the styling part is designed here as a styling edge. At least one guide means is arranged around the styling part in at least some areas, with a guide edge running parallel to the styling edge.

Abstract: A split crimper for use in a crimping assembly for engaging and heat sealing overlapping layers of a packaging material includes a first crimper portion having a crimping surface and a second crimper portion that is secured to the first crimper portion to form a crimper. Portions of the first and second crimper portions cooperate to define an interior cavity, and a heating element is disposed completely within the interior cavity.

Abstract: A split crimper for use in a crimping assembly for engaging and heat sealing overlapping layers of a packaging material includes a first crimper portion having a crimping surface and a second crimper portion that is secured to the first crimper portion to form a crimper. Portions of the first and second crimper portions cooperate to define an interior cavity, and a heating element is disposed completely within the interior cavity.

Abstract: A split crimper for use in a crimping assembly for engaging and heat sealing overlapping layers of a packaging material includes a first crimper portion having a crimping surface and a second crimper portion that is secured to the first crimper portion to form a crimper. Portions of the first and second crimper portions cooperate to define an interior cavity, and a heating element is disposed completely within the interior cavity.

Abstract: A heating element for a film-sealing apparatus comprises a heating wire segment formed of a first metal having a first reflectance to laser radiation of a predetermined wavelength. The heating element further comprises a first conductor lead comprising a wire having one end joined to a first end of the heating wire segment, and a second conductor lead comprising a wire having one end joined to a second end of the heating wire segment. The first and second conductor leads have a lower electrical resistance than the heating wire segment, and are formed of a second metal having a second reflectance to laser radiation of the predetermined wavelength, the second reflectance being higher than the first reflectance. Each of the first and second conductor leads is lap-welded to the respective end of the heating wire segment using laser radiation of the predetermined wavelength.

Abstract: A tube sealing device for sealing a resilient thermoplastic tube. The tube sealing device includes a base that supports a resilient thermoplastic tube in a fixed position relative to the base. The heating tool and the cooling tool are coupled to the base for movement relative to each other. Relative movement between the heating tool and the base aligns the heating tool with a portion of the resilient thermoplastic tube. The heating tool operates to contact, pinch and heat the portion of the resilient thermoplastic tube. Relative movement between the cooling tool and the base aligns the cooling tool with the same portion of the resilient thermoplastic tube. The cooling tool operates to contact, pinch and cool the resilient thermoplastic tube to form a seal.

Abstract: The invention is a rotatable cylindrical roll for heat sealing heat sealable materials that includes a heating zone for sealing the material and a cooling zone for supporting the newly formed seal. The device comprises a conductive zone and a resistive zone that are in electrical communication. The resistive zone comprises a cylindrical member having a circumferential band of resistive material disposed on its surface. The conductive zone comprises a cylindrical member having a plurality of conductive strips extending laterally across its surface that are in electrical communication with the resistive band. Current is applied via a brush to the conductive strips. Current flows from the conductive strips into the resistive band and exits through a conductive strip that is in contact with a ground. Current path through the resistive band defines the heating zone, and the cooling zone is defined by area of the resistant band outside the heating zone.

Abstract: The invention is a sealing system and a method of operation thereof. A sealing system which forms spaced apart thermal seals along a moving at least one web (60) by contact of the moving the at least one web with heated portions (74) of sealing elements (56) mounted on a sealing wheel (50) during rotation in accordance with the invention includes seal forming elements (56) which peripherally contact the at least one web to form the thermal seals by heat transfer to the at least one web; and wherein each seal forming element has an outer section (62) on which is located at least one electrical heater (78), an inner section (64) which contacts the sealing wheel and an intermediate section (70) which includes thermal insulation (68) which insulates the outer section from the inner section.

Abstract: An apparatus and device for fusing two or more foam components together by thermal welding, has an interface blade adapted for placement at an interface of foam components to be fused together, and a nozzle proximate to the interface blade for distributing a heated gas at the interface of the foam components. The nozzle may be located in a shroud proximate to the interface blade. An automated foam welding apparatus has a platform for supporting foam components or other components, a clamp for applying pressure to one or more of the foam components, and one or more welding heads mounted upon a track for translation proximate to the foam components to be welded together, the welding heads having an interface blade and a heated gas distribution nozzle, and optionally a trimmer for trimming excess material from one or more of the foam components. A hand-held foam welding device is also described.

Abstract: A roller heating system for a laminating machine comprises a first rolling shaft and a second rolling shaft, wherein the first rolling shaft and the second rolling shaft are parallel with each other, and a heating mechanism is mounted on the respective surface of the two rolling shafts. Then, a heat conduction layer wraps up the respective surface of the above-mentioned rolling shafts as well as the heating mechanisms. When the lamination proceeds, the heat mechanisms firstly heat the heat conduction layers to a working temperature and at the same time, the first and second rolling shafts respectively rotate in a predetermined direction, and then an article covered with laminating plastic films is fed into the roller heating system. The heat conduction layers heat the laminating plastic films to melt the fusion gum of the inner surfaces of the laminating plastic films, and subsequently the laminating plastic films are forced by the compression of the first and second rolling shafts to adhere to the article.

Abstract: The invention is a sealing system and a method of operation thereof. A sealing system which forms spaced apart thermal seals along a moving at least one web (60) by contact of the moving the at least one web with heated portions (74) of sealing elements (56) mounted on a sealing wheel (50) during rotation in accordance with the invention includes seal forming elements (56) which peripherally contact the at least one web to form the thermal seals by heat transfer to the at least one web; and wherein each seal forming element has an outer section (62) on which is located at least one electrical heater (78), an inner section (64) which contacts the sealing wheel and an intermediate section (70) which includes thermal insulation (68) which insulates the outer section from the inner section.

Abstract: There is disclosed a heat-sealing method including: feeding a fusible fiber sheet (12) into the clearance between a pair of rolls (1, 5), at least one of which has sealing ridges (2, 6) of a predetermined pattern on its outer circumference; and heating and pressing the fiber sheet (12) with the sealing ridges (2, 6), to form fused portions corresponding to the pattern of the sealing ridges (2, 6), in the fiber sheet (12). An insulator (4) is disposed to cover the outer circumference of the rolls (1, 5), as lacking the sealing ridges. The insulator (4) is made of a material which has a lower thermal conductivity than that of the sealing ridges and which can be elastically contracted by the pressure of the rolls (1, 5). The fiber sheet (12) to be fed into the clearance between the rolls (1, 5) rotating is compressed by the insulator (4) to discharge its internal air and is then heated and pressed by the sealing ridges (2, 6) so that it is heat-sealed.

Abstract: The invention is a sealing system and a method of operation thereof. A sealing system which forms spaced apart thermal seals along a moving at least one web (60) by contact of the moving the at least one web with heated portions (74) of sealing elements (56) mounted on a sealing wheel (50) during rotation in accordance with the invention includes seal forming elements (56) which peripherally contact the at least one web to form the thermal seals by heat transfer to the at least one web; and wherein each seal forming element has an outer section (62) on which is located at least one electrical heater (78), an inner section (64) which contacts the sealing wheel and an intermediate section (70) which includes thermal insulation (68) which insulates the outer section from the inner section.

Abstract: A roller heating system for a laminating machine comprises a first rolling shaft and a second rolling shaft, wherein the first rolling shaft and the second rolling shaft are parallel with each other, and a heating mechanism is mounted on the respective surface of the two rolling shafts. Then, a heat conduction layer wraps up the respective surface of the above-mentioned rolling shafts as well as the heating mechanisms. When the lamination proceeds, the heat mechanisms firstly heat the heat conduction layers to a working temperature and at the same time, the first and second rolling shafts respectively rotate in a predetermined direction, and then an article covered with laminating plastic films is fed into the roller heating system. The heat conduction layers heat the laminating plastic films to melt the fusion gum of the inner surfaces of the laminating plastic films, and subsequently the laminating plastic films are forced by the compression of the first and second rolling shafts to adhere to the article.

Abstract: There is disclosed a heat-sealing method including: feeding a fusible fiber sheet (12) into the clearance between a pair of rolls (1, 5), at least one of which has sealing ridges (2, 6) of a predetermined pattern on its outer circumference; and heating and pressing the fiber sheet (12) with the sealing ridges (2, 6), to form fused portions corresponding to the pattern of the sealing ridges (2, 6), in the fiber sheet (12). An insulator (4) is disposed to cover the outer circumference of the rolls (1, 5), as lacking the sealing ridges. The insulator (4) is made of a material which has a lower thermal conductivity than that of the sealing ridges and which can be elastically contracted by the pressure of the rolls (1, 5). The fiber sheet (12) to be fed into the clearance between the rolls (1, 5) rotating is compressed by the insulator (4) to discharge its internal air and is then heated and pressed by the sealing ridges (2, 6) so that it is heat-sealed.

Abstract: A method and apparatus for imprinting a sublimation transfer onto a generally cup-shaped or tubular structure. The apparatus includes a support structure for holding of the structure. A blower is provided for providing a flow of heating air to the interior surface of the structure. A control device is provided for directing the flow of heating air in a uniform manner about the interior surface of the structure.

Abstract: The heated laminating roll of the present invention comprises a cylindrical core having an exterior surface, an electrical resistance heating wire disposed on the exterior surface of the cylindrical core, and a silicone rubber cover disposed on the core. The silicone rubber cover provides the exterior surface of the roll. A metallic mesh is disposed within the silicone rubber cover. The metallic mesh is electrically insulated from the heating wire and is also electrically grounded. The metallic mesh layer is typically constructed of copper. The roll also may include temperature sensing devices disposed within the silicone rubber cover. The temperature sensing devices may also be disposed within the interior of the cylindrical core. The heated laminating roll provides the benefits of using an electrical resistance heater wire and additionally includes means to effectively conduct heat throughout the roll as well as providing means to safely shield the user from electrical shock.

Abstract: A pouch laminator used for coating both sides of a small-sized sheet such as a photograph or identification card with a vinyl film is disclosed. Two folding guide plates are hinged to front and rear sides of the laminator body, respectively. A pair of bearing units are placed inside the laminator body for bearing the heating and molding rollers. A tension member detachably mounted to the top of each bearing unit for elastically holding the heating and molding rollers. A power supply unit having an elastic piece is placed aside each bearing unit. The elastic piece is brought into contact with a terminal provided on an associated end of each heating roller. A flat or embossing roller may be used as the molding roller. The embossing roller has a knurled rolling surface, thus embossing both sides of a coated sheet.

Abstract: Coated fuser members such as a fuser roller, pressure roller, or fuser belt, and the method of making the coated fuser members are disclosed. The release coating comprises an outermost layer of fluoropolymer resin uniquely bonded to a fluoroelastomer layer by means of a fluoropolymer-containing polyamide-imide primer layer.

Abstract: The present invention relates to a pre-proof temperature controlling assembly associated with an off-press apparatus for laminating an image sheet to an image receiving substrate and, more particularly, for laminating a plurality of image sheets to the receiving substrate and then laminating a portion of the receiving substrate to a display sheet.

Abstract: The present invention provides a laminating apparatus comprising a sheet transporter for transporting a sheet, a laminating film transporter for transporting at least one laminating film in such a manner that the laminating film is superposed with at least one surface of the sheet transported by the sheet transporter. A pressing mechanism means presses the sheet and the lamenting film or films in a mutually superposed state, a heater heats the laminating film, heat capacity detector detects the heat capacity of at least one of the laminating film or films and the sheet, and a controller controls at least one of the heater and the laminating film transporter, according to a detection signal from the heat capacity detector.

Abstract: A heat and pressure roller-type fusing apparatus for fusing toner images onto a substrate includes a fuser roller which has a hollow metallic core and at least an elastomeric outer layer that is formed over the core. A heat source is mounted within the metallic core for heating such core and the elastomeric layer to a desirable fusing temperature. The fuser roller includes a first length portion which is substantially equal to the cross-track dimension of the substrate for contacting the substrate, and a second length portion which adjoins the first length portion and an end of the fuser roller. The fuser roller also includes a heat absorbing and dissipating member that is mounted inside the hollow core for inwardly absorbing and dissipating heat from the core within the second length portion of the fuser roller, thereby reducing the heating and temperature of the surface of such second length portion of the fuser roller.

Abstract: Disclosed are an apparatus for and a method of recording an image in which a heat-developable light-sensitive material and an image-receiving material are superposed on each other and the superposed two materials are inserted between an outer periphery of a heating drum and an endless belt wound around a plurality of rollers and are wound around the outer periphery of the heating drum by pressing the two materials against the outer periphery of the heating drum by the endless belt, and the heating drum is rotated by being pressed by the endless belt, so as to heat develop the heat-developable light-sensitive material and allow an image formed by heat development to be transferred onto the image-receiving material.

Abstract: A laminating system includes a pair of heated laminating rollers (14) for drawing laminating film (12) from supply rolls and preheat members (30) between the supply rolls and the laminating rollers. The preheat rollers are heated internally by a bonded electrical heating element, while the laminating rollers are heated by a separate bonded internal heating element. The system includes pull rollers (18) for drawing the laminated articles from the supply roll (10) across preheat rollers (30) and through laminating roll (14) with a blower system (20, 242) for cooling the articles.

Abstract: A method of forming an image which comprises subjecting an image-forming material comprised of a substrate and a photosensitive layer containing a dye and/or a pigment and a photopolymerizable compound and disposed on the substrate to an image-exposure, thereby to allow the exposure to cause a difference of adhesion between an exposed portion and non-exposed portion in the photosensitive layer, and transferring the image to an image receptor on the basis of the difference of adhesion; wherein the photosensitive layer of the exposed image-forming material and the image receptor are allowed to face each other and directed into the nip between two rollers consisting of an elastic roller and a metallic roller having a surface temperature of between 50.degree. C. and 150.degree. C.

Abstract: A heat energy transfer device has an enclosure defining a closed cavity and including an outer face to be heated or cooled. A heat transfer medium is contained in the cavity. The device has a first capillary arrangement disposed in the cavity for advancing the heat transfer medium in the liquid phase in a first direction parallel to the outer face of the enclosure and a second capillary arrangement disposed in the cavity for advancing the heat transfer medium in the liquid phase in a second direction parallel to the outer face of the enclosure. The first and second directions are non-parallel to one another.

Abstract: A thermally developing apparatus for a light and pressure sensitive material. The exposed material is inserted between a rotating heated roller and an endless belt wrapped partially around the roller. Additionally, a temperature sensor detects abnormally high temperatures and, as a result, removes the material from the heated roller.

Abstract: The roller has a roller body having a small heat capacity, a bonding layer formed substantially uniformaly on the outer peripheral surface of the roller body, a lower insulating layer provided on the bonding layer; a heat generating layer provided on the lower insulating layer and having a ceramic matrix and a metallic resistance layer constituted by a metal dispersed in the ceramic matrix, the metallic resistance layer extending substantially continuously in the lengthwise direction of the roller, the heat generating layer having a thermal expansion coefficient substantially the same that of the lower insulating layer, an upper insulating layer provided on the heat generating layer, a protective layer formed on the upper insulating layer so as to prevent offset of the toner images, and an electrode layer formed on each end of the roller and adapted to connect the heat generating layer to an external power source.

Abstract: A curling iron includes an elongated heating element attached at one end to a handle and having an outer circular peripheral surface provided with a plurality of generally arcuately spaced, radially open grooves extending longitudinally on the outer peripheral surface of the heating element between the first end adjacent the handle and second free end, with the grooves being axially open at the second end. Plurality of bars supporting hair grooming members are slidingly removably engaged in the grooves through the open ends thereof in heat exchange relation with the heating element. An auxiliary handle is attached to the second end of the heating element for preventing removal of the bars from the grooves, there being free, unlimited, bidirectional relative rotation between the auxiliary handle and the heating element.

Abstract: There is disclosed a heated roll for the thermal treatment of formed products. It includes a driven hollow shaft and a hollow roll body of a circular-ring-shaped cross section and closed on all sides to accommodate a heat transfer medium. Power supply lines for heating elements as well as electric wires of temperature probes are led through the hollow shaft. In order to provide a heated roll to be used without problems both in the low-temperature range and in the high-temperature range up to about 600.degree. C. and to reach a uniform temperature profile over the total operation surface of the roll outer shell and a long service life of the heat transfer medium, without excessive temperature prevailing at the bearings of the driving shaft, and to provide for an easy repair, the hollow shaft is connected with the roll body by a hub. One or several saline compound(s) or (a) low-melting metal(s) or metal alloy(s) are contained in the interior of the hollow roll body.

Abstract: The outer side surface of the drying cylinder (1) is delimited by a plurality of coaxial rims (2) having the same radius, arranged side by side and separated two by two by an axial space (7), and made of a good heat-conducting material. Each rim (2) is heated and cooled independently from the others by a heating member (8) and a cooling member (11) housed into a subrim (3) surrounding by the rim (2). The heating is provided for example by an electric resistance and the cooling by circulation of cold water, the control being provided by means of remote controlled relays (10). Each rim (2) is rotationally integral with a hub (5) wedged to a drive shaft (6). A comb (26) having teeth (27) engaged into the spaces (7) avoids the winding of material around the cylinder (1) which is in depression conditions in order to favor the heat exchanges by suction of the material against the cylinder (1). Applications to the equipment of dry ends and post dry ends of paper-, cardboard- or other web material machines.

Abstract: A fixing roller for a fixing unit for a copying machine has a heater disposed within an aluminum cylinder. A pair of stainless steel, U-shaped plates, which have holes cut in their bottoms, are fitted into opposite end portions of the cylinder to hold the heater and to utilize the heat generated thereby. A pair of bearings, which have outer races made of heat-resistant resin, are fitted into the opposite end portions of the cylinder under pressure to support the cylinder so that the outer races and the cylinder turn as one unit.

Abstract: The invention concerns variable contour rollers for use in calendering or pressing devices, printing presses and like applications. The rollers include an external element of cylindrical form, for example of cast iron, and in their interior a number of transverse elements which can be made to expand radially by heating. More or less substantial radial expansion provokes directly or indirectly a change in the profile of the exterior generally cylindrical working surface. The interior of the roller may be a shaft carrying heating elements and which is fixed or rotates with the external working surface.