Abstract: The invention relates to a method for manufacturing a roll coating onto a roll frame (1), which coating comprises a base layer (2) on the roll frame (1) and a surface layer (3) on the base layer (2). The base layer (2) is brought to its final form after the surface layer (3) has been formed and cured or solidified. The surface layer (3) is formed on the base layer (2) and cured or solidified after the base layer (2) has been formed on the roll frame (1).

Abstract: An improved roller assembly for use in machinery such as round balers is disclosed. The roller assembly of the present invention reduces sensitivity to varying dimensional tolerances on the roller assembly and the structure to which the roller assembly is mounted. At least one elastic member is used to permit the axial position of at least one of the bearings on the roller assembly shaft to vary. Spring washers provide a predetermined, axial force to at least one of the bearings.

Abstract: An apparatus for applying a liquid to a surface in a pattern includes a rollable core with first and second sections adjacent to each other and each having a length and a circumference. A first liquid applicator includes a material for holding and applying a liquid to a surface and is attached to the first section of the core. A second liquid applicator includes a material for holding and applying a liquid to a surface and is attached to the second section of the core. The first liquid applicator material and/or the second liquid applicator material covers a portion of its respective section's circumference that is less than the entire circumference of the section, and the first and second liquid applicators are arranged on the core so as to produce a consecutively repeating non-random pattern when the first and second liquid applicators are placed in contact with and rolled along a surface.

Abstract: A bearing (100) has a contact surface (110) for mating with a rotatable member. The contact surface has a plurality of crystalline grains (120) distributed at random; a plurality of micro-grooves (130) are formed among the crystalline grains; the micro-grooves communicate with each other thereby forming a net. The micro-grooves accommodate lubricant therein so that when the rotatable member rotates, a sufficient lubrication can be obtained between the bearing and the rotatable member. The bearing is formed by machining and then thermally etching a preform which is formed by powder metallurgy.

Abstract: There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.

Abstract: The present invention provides a double-sleeved roller for use in an electrostatographic machine. The double-sleeved member includes a cylindrical rigid core member. A removable inner sleeve member (ISM) is provided that includes a compliant layer that surrounds and intimately contacts the rigid core member. A removable electrically conductive outer sleeve member (OSM) such that the OSM surrounds and intimately contacts said ISM wherein the ISM and OSM are removable or mountable simultaneously.

Abstract: A rolling mold for microstructured film imprinting includes a roller and a filmed metal template. The roller has a round outer surface. The filmed metal template is disposed with a microstructured film imprint pattern and changeably coupled to the roller by magnetic force or vacuum suction. Rolling of the roller allows the microstructured film imprint pattern to form a microstructured film, thus solving the drawbacks of the prior art.

Abstract: An object of the present invention is to provide a charging roller (i) which includes a rubber member whose surface is subjected to a hardening treatment using a solvent containing at least an isocyanate compound and (ii) which can prevent leakage of an ionic conductive agent even if the charging roller is placed under conditions of high temperature and high humidity for a long time. The charging roller is made by forming a rubber layer on a metal core. The rubber layer is an epichlorohydrin based rubber base material to which an ionic conductive agent is added, the rubber layer being subjected to a surface treatment by applying a solution containing the isocyanate compound and heating it. This surface treatment is carried out under such conditions that a coefficient of dynamic friction at a contact portion between the rubber layer and a photoreceptor becomes 0.4 or less.

Abstract: A roll for metal rolling has a roughened surface formed by an electrolytic treatment in an electrolytic solution while using the roll as an anode. When the roll is used to emboss an aluminum plate, it is possible to obtain an aluminum plate with an uneven structure having regulated positions of levels of peaks and a larger number of the peaks. A presensitized plate formed by use of the aluminum plate as a support has excellent printing performances particularly in the number of printed sheets and sensitivity.

Abstract: A mill roll analysis system is described that includes a user interface module, a structural analysis engine, and an analysis control script. The user interface module receives mill roll design data from a remote user via a computer network. The analysis control script automatically directs the structural analysis engine to define and evaluate an appropriate analytical model for the mill roll design based on the mill roll design data. The mill roll analysis system presents an intuitive web-based interface for capturing the mill roll design data, and may present predefined mill roll applications and mill roll types for selection for the user. As a result, the remote user need not be familiar with the underlying analytical modeling techniques, which may be highly-complex by nature. Consequently, a user may utilize the system to evaluate and improve mill roll design in order to achieve increased product performance.

Abstract: Improved work roll, particularly for use in closed gap rolling, has a composite structure comprising a cylindrical outer layer (14) made of steel, and providing the work surface of the roll, separated from a steel core (12) by an intermediate layer (13) of material such as aluminium or copper having a lower Young's modules than that of the layer (14). Provided that the dimensions of the outer layer (14) and intermediate layer (13) are chosen appropriately, this combination can release a work roll having an affective Young's modules which is lower than that of steel whilst at the same time retaining the advantages of a steel work surface and enabling higher rolling speeds.

Abstract: An improved conveyor roller (100) having a belt-engagement length (103) between a first end (101) and second end (102), and a necked-down portion (109) adjacent the second end, and a method of manufacturing such a roller are disclosed. The method comprises forming a roller from a metal tube (12) with a longitudinal axis (106), first and second ends, and an initial outer diameter by: rotating the tube about the longitudinal axis, the tube being substantially free of internal and external supports between the ends thereof, providing rollers (40,41) which are rotatable about corresponding axes generally parallel to the longitudinal axis; and urging the rollers against the tube and moving the rollers between the ends of the tube so as to alter the outer diameter of the tube to form the belt-engagement length and the necked-down portion, the necked-down portion providing a mounting surface for receiving a bearing assembly.

Abstract: Deflection compensation roll and process for reducing vibrations in deflection roll. The roll includes antifriction bearings, a roll jacket supported in an area of its axial ends on the antifriction bearings, and hydraulic supports arranged to hydraulically support the roll jacket parallel to a working plane. A damping device, positioned next to each antifriction bearing, is structured and arranged to act essentially perpendicular to the working plane.

Abstract: Deflection controlled roll that includes a rotating roll jacket, a rotationally fixed yoke arranged to axially pass through the roll jacket, and a plurality of hydrostatic support elements arranged in series on the yoke in the direction of a roll axis which are chargeable with a pressure fluid to exert a supporting force on an inner side of the roll jacket. The plurality of hydrostatic support elements include hydrostatic pockets and at least one restrictor or capillary structured and arranged to supply pressure fluid to each of the hydrostatic pockets. A volume flow of at least some of the pressure fluid supplied to a respective hydrostatic pocket is variable depending upon a pressure on its respective hydrostatic support element.

Abstract: The caster roll (10) is used in the manufacture of metal plate, strip, sheet, or foil. The caster roll (10) includes a cylindrical roll core (12) and at least one metal overlay (14) formed on the roll core (12). The at least one metal overlay (14) defines a plurality of cooling passages (34) for conducting a cooling medium through the at least one metal overlay (14) to cool the roll (10) during use. Additional metal overlays (16) may be formed on top of the at least one metal overlay. (14). The cooling passages (34) may also be formed in the roll core (12).

Abstract: A roller body for a roller, for pressure-treating or temperature-treating or combined pressure- and temperature-treating a web-shaped medium, for example paper, includes a casting body made of an iron-based alloy comprising graphite lamellae. Particular regions of the roller body are placed under tensile stresses during or after production. The stresses being applied are larger than those which occur in these regions during operation of a roller. The additionally applied tensile stresses trigger local plastic deformations in peripheral regions of the graphite lamellae, such that once the tensile stresses are no longer applied, the roller body behaves elastically and no longer permanently deforms up to the stress level achieved.

Abstract: An improved stationary roller shaft of a gear assembly for an air turbine starter is provided. The air turbine starter may be used to start a gas turbine engine, such as may be found in aircraft, ships and military vehicles. The stationary roller shaft is formed of a material having a hardness of at least 66 Rockwell C and having a low inclusion content rating, thereby providing improved wear and/or fatigue properties.

Abstract: In order to manufacture a discharging roller which discharges a recording medium from a recording apparatus, there are a first die formed with a first recess extending in an axial direction of a shaft portion of the discharging roller, and a second die formed with a second recess extending in the axial direction. The first die and the second die are combined such that the first recess and the second recess face to form a continuous cavity. Synthetic resin is injected into the cavity to mold a bore portion of the shaft portion.

Abstract: A method for manufacturing a mirror surface tube for a photosensitive drum of a copying machine or the like, by which an external surface of an aluminium or aluminium alloy tube can be mirror-processed with high accuracy without surface defects, and in such a way that good quality required for a photosensitive drum is ensured and dimension accuracy, such as roundness, and production yield is improved involves a first step in which an aluminium or aluminium alloy tube, finished in a predetermined shape and dimension with surface roughness of 10 microns or less, is processed by a centerless grinding process. Then, in a second step, a grinding process is performed using an electrolytic integrated polishing apparatus including a tool electrode mechanism having an elastic grindstone so as to make a mirror surface tube having the surface roughness of 2.0 microns or less. Further, preferably, in a third stage, a roller burnishing process is performed to finish the tube to a surface roughness of 0.5 microns or less.

Abstract: A roll changing apparatus for a four-high rolling mill comprises rails, provided in a rolling mill stand and on a work side of the rolling mill, for incoming and outgoing of a work roll assembly and a backup roll assembly, and a pusher, provided on a drive side or the work side of the rolling mill, for roll admission and withdrawal for both of work rolls and backup rolls. The roll changing apparatus can be modified into a side shift type roll changing apparatus with ease, at a low cost, and in a short time.

Abstract: The invention relates to a method for coating a composite cylinder. On top of said composite cylinder (1) is drawn or extruded a metal casing (2), whose metal surface is modified a metal treatment process and/or plated with a coating layer.

Abstract: A groove processing method capable of smoothly processing a groove on a rod that has been subjected to a hardening treatment without a substantial degradation in strength is provided. A pair of straightening rollers is mounted at each side of rolling rollers mounted on respective rotating shafts of a rolling machine with spacers disposed between the straightening and rolling rollers. A rod is previously subjected to a hardening treatment, for example, high-frequency induction hardening and tempering, or carbulizing & quenching and tempering, so that the surface hardness is not less than 400 Hv. A groove is formed on the rod by rolling using the rolling rollers, thereby allowing a surface hardening layer to be left on the bottom of the groove. At the same time, the rod is held by the straightening rollers to prevent bending of the rod.

Abstract: A used developer-carrying member having a resin coating layer on a substrate is regenerated through a step of scraping the resin coating layer of the used developer-carrying member to form a developer-carrying member surface having unevenness showing a central line-average roughness Ra of at most 0.8 &mgr;m, and a step of coating the developer-carrying member surface having the unevenness with a coating layer of a resinous composition comprising at least a binder resin and electroconductive fine powder. The regenerated developer-carrying member can be reinstalled in a developing apparatus and subjected to repetitive electrophotographic image forming cycles.

Abstract: A method for making an elastic roller for a pressing apparatus comprising a plurality of rollers to define at least one chamber therebetween comprises the step of: providing at least one cavity below the roller surface of said elastic roller in the region of at least one roller end for cooperation with at least one raised portion provided on said elastic roller in the region of the roller end or on a counter roller of said pressing apparatus.

Abstract: A development roller of an electric-photographic machine is manufactured by a method of mixing a base material of either NBR rubber or HYDRIN rubber, an electric conductive high-molecule-weight material to adjust an electric resistivity of the development roller, and peroxide as a cross-link agent cross-linking the base material and the electric conductive high-molecule-weight material in a three-dimensional structure, forming the development roller from a mixture of the base material, the electric conductive high-molecule-weight material, and peroxide, and irradiating the development roller with ultraviolet light to adjust a friction coefficient of a surface of the development roller. Accordingly, the development roller has characteristics of a low electric resistivity even with a single layer structure.

Abstract: The invention relates to a roller for fluid film preparation, having an inside core (3), a first layer A, which surrounds the core and has a first hardness, and a second layer B, which surrounds first layer A and has a second hardness different from that of the first layer, where the two surround the core with a layer thickness d. In order to design a roller for fluid film preparation, particularly for offset printing, with which inhomogeneities in the printing medium or printed product, particularly ribbing on the printed product, can be at least largely avoided, and which is cost-efficient to manufacture, it is proposed that the roller coating be provided, at least in certain sections, with an essentially continuous hardness gradient through the layer thickness (dV). In order to produce the hardness gradient, a gradient of a hardness-modifying substance or agent, or a precursor thereof, e.g.

Abstract: A star wheel manufacturing process, and a star wheel manufactured thereby, suitable for an ink jet printer. Metal is formed by chemical milling, subtractive etching or the like, into the desired star wheel configuration, including a plurality of radially extending projections having tips. At least a portion of each tip has an electropolished surface. A coating of fluorinated polymer or the like may be applied to at least a portion of the electrolpolished surface on each tip.

Abstract: A magnetic roll, such as for use in a xerographic printing apparatus, is formed from two semicylindrical partial cylinders. The partial cylinders can be molded and attached to each other to form a complete cylinder defining magnetic poles along the circumference thereof.

Abstract: Rotatable plastic rollers are produced by either injecting between a roller shaft and an outer running roller layer a thermoplastic material which, during cooling down, shrinks toward the roller shaft and away from the outer running roller layer on account of a contraction in volume or, in the multi-component injection-molding process, by first injecting the outer running roller layer and then injecting between the latter and the roller shaft a thermoplastic material which then likewise shrinks toward the roller shaft and away from the outer running roller layer. The process produces plastic rollers comprising an inner running roller layer (2), which is bonded solidly with the roller shaft (1), and an outer running roller layer (3), which can rotate freely with respect to said inner layer by means of a sliding gap (6). The roller shaft may optionally also be sheathed with a thermoplastic elastomer. This may take place in the same process during the multi-component injection molding.

Abstract: A conformable roller for use in a fusing station of an electrostatographic machine, the fusing station being provided with a pressure roller and a fuser roller for fusing a toner image on a receiver, the fuser roller made from a plurality of layers surrounding an axis of rotation, the conformable roller including a rigid cylindrically symmetric core member; a flexible replaceable removable compliant sleeve member in the form of a tubular belt surrounding and nonadhesively intimately contacting the core member; and the fusing station including an internal heat source for the fuser roller, at least one of the plurality of layers being thermally conductive.

Abstract: A metal pipe excellent in dimensional accuracy, which is suitably used for a development sleeve, a fixing roller, or a photosensitive drum for electrophotographic apparatuses or electrostatic recording apparatuses such as copying machines or printers, or a base body thereof. The metal pipe is produced by cutting a long-sized metal pipe body into a specific length, to obtain a raw pipe, and adjusting the surface state and the dimensional accuracy of the raw pipe by cutting and polishing the outer peripheral surface of the raw pipe, wherein the raw pipe has an inner stress of 20 N/mm2 or less.

Abstract: An improved specialty paint finish roller comprising a conventional roller handle assembly having an axle portion, a roller tube and a naturally occurring sponge material secured around the roller tube. The roller tube is fabricated by slicing natural sponge in a manner to form essentially flat sponge pieces. One of the sponge pieces is then placed over a surface of a base material having an adhesive applied thereto, the sponge material thereby adhering to the base material. The sponge/base material is then cut lengthwise into an adhesive and is then wound about the surface of the roller member, the adhesive then being allowed to dry. The elongated tube member is then cut to predetermined sizes, the resulting roller tube being joined to the roller handle assembly. Using a natural sponge as the paint applicator produces a natural design, each roller being unique such that a unique design is applied to an interior wall.

Abstract: The present invention provides an elastic body having a small volume change caused by the change in temperature, a roller having a small change in outer diameter thereof caused by an increase in temperature of the roller during operation, a manufacturing method therefor, and a heating and fixing device which can maintain a constant processing speed. The roller has an elastic layer formed by curing a silicone rubber material containing at least expanded resin microballoons, wherein, when the roller is placed in a vacuum chamber in which atmospheric pressure is reduced to 0.001 MPa or less over 2 minutes, the roller has a gas permeability indicating the recovery characteristic where an increased amount of the thickness of the elastic layer after 10 minutes from the start of evacuation is two-thirds or less of the maximum increased amount of the thickness of the elastic layer during a 10 minutes period from the start of evacuation.

Abstract: The present invention relates to a paint roller having an open end which can be inserted into an applicator handle and a surface area adapted for use in painting. The core of the roller is made from a core material and the core has an inner surface and an outer surface. A major portion of the core has a substantially uniform thickness. A cover is affixed to substantially all of an outer surface of the core and a processed region at one end of the core has a reduced thickness which is less than the substantially uniform thickness of the major portion of the core. The processed region of the core is folded inward such that the one of the core and the reduced portion of the core material are not exposed at the end of the paint roller.

Abstract: The present invention provides an extruded external drum for an imaging system. The external drum is extruded from a light-weight and strong material such as an aluminum alloy. The external drum includes a thin outer wall, a hollow cylindrical hub, and a plurality of thin radial spokes extending between the cylindrical hub and the outer wall. The present invention provides a stiff external drum having low rotational inertia.

Abstract: A method of fabricating a developer bearing body includes the steps of preparing metallic base material blasting the surface of the metallic base material using spherical particles and plating the surface of the metallic base material blasted, wherein a thickness of the plating layer is two or more times as large as a particle diameter in volume average of the developer.

Abstract: An interconnected apparatus for producing a low loss, reproducible electrical interconnection between a semiconductor device and a substrate includes a rod and rod receptor. The rod, generally cylindrically shaped, is attached to the semiconductor device and includes an outer circumferential wall which comes into contact with the rod receptor during a bonding process. A lip portion is formed on one end of the rod receptor for interlocking engagement with the rod. The rod receptor is plated on the substrate and includes a generally circularly shaped body which forms a centrally disposed well for receiving the rod. A lip portion is formed on one end or mouth of the rod receptor for interlocking engagement with the rod. When the rod and corresponding receptor are aligned and brought together, the rod deforms and interlocks with its corresponding rod receptor. A thermo-compression bonding process is utilized to bond the rod to the rod receptor, thereby producing a strong interlocking bond.

Abstract: A method of manufacturing a paint roller includes the steps of providing at least one strip of non-plastic base material, applying a coating of partially melted plastic to at least one side of the strip of material prior to winding the strip about a mandril, winding the strip of material, after application of the partially melted plastic thereto, about the mandril in a spiral manner, the partially melted plastic causing the strip of material to bond forming a core, and winding a strip of fabric material about the core in a spiral manner, the partially melted plastic material applied to the base strip prior to winding causing the fabric material to bond to the core forming the paint roller.

Abstract: A roller is equipped with an elastic layer comprising a foam, wherein at least a part of the elastic layer is subjected to permanent compressional deformation by heating compression, and the cells in the elastic layer subjected to permanent compressional deformation by heating compression outnumber the cells therein before the heating compression; and a process for producing the above roller in high efficiency. The above process enables the production of the roller in which the surface state of only an arbitrary portion thereof is modified according to the purpose of use, and the roller thus obtained can exhibit high performances in a variety of applications including paper feed roller, developer conveying roller and so forth.

Abstract: A method for fitting a roll mantle of a tubular roll used in a paper machine or equivalent with glide bearings and a tubular roll. The roll mantle is supported on a stationary roll axle by hydraulic glide bearing elements acting upon the roll mantle and/or upon the roll ends. The bearing elements are loaded hydraulically by the pressure of a first pressure medium. The roll is loaded from outside radially in the direction of at least one plane, i.e. in a so-called principal loading direction. The roll mantle is supported on the roll axle by the glide bearing elements which act radially substantially in the principal loading direction in opposite directions and which are provided with a device for regulating the braking pressure provided by a second pressure medium, so that in the principal loading direction, the roll mantle is allowed to move over a certain distance.

Abstract: A grinding roll for use in a material bed roll mill for the comminution of brittle material has a cylindrical body in the periphery of which are alternating grooves and lands. To the exterior of each land is secured a wear strip. The grooves of the confronting rolls may be directly opposite one another or the grooves may be offset axially so that the grooves in one roll confront a land of the opposite roll.

Abstract: A dry furnace roll design operates at a high temperature environment of a metal heating furnace by arranging weld metal joining a roll sleeve to roll bells at opposite ends in cavities formed in the sidewalls of the furnace. A dense filling of ceramic fiber material is held in each roll bell underlying the weld connection with the roll sleeve by discs. Ceramic fiber material is put into the cavity of the sidewall and held in place by a keeper plate. The masses of weld metal joining the roll sleeve to the roll bells are comprised of TIG weld metal formed in an inert gas. Multi-pass welding is performed while supporting the roll assembly during the welding operation at an angled relation to the horizontal. The roll is rotated in the angled relation to allow the deposition of weld metal in multiple passes and in an accurately controllable manner preferably by the use of a microprocessor to control the positioning of weld electrode.

Abstract: Method of producing metal sheets or strips by cold reduction rolling of a metal sheet or strip with at least one pair of work rolls, at least one of which being a textured work roll in order to transfer the surface pattern of the textured work roll to the surface of said sheet or strip, characterized in that said pattern of the textured work roll consists in a bidimensional deterministic pattern of spots wherein each spot has the form of a crater with a rim around it.

Abstract: This invention provides a highly efficient method for fabricating toner fixing rolls comprising a cured silicone rubber layer covering a metal core and a fluororesin film covering the silicone rubber layer. The characterizing feature of the present method is coating the inner surface of the fluororesin film with an organohydrogenpolysiloxane prior to contacting the film with the curable silicone rubber composition. The resultant roll is robust, highly toner-releasing; and low in hardness, and the fluororesin film and cured silicone rubber are firmly bonded to one another.

Abstract: A process for improving the run-in characteristics of drives having sintered bearings. The drives are subject, prior to their operational usage in repeated cycles (I; II etc.), to a loading procedure exhibiting respectively a first load (M.sub.1), with the effect of operating of the sintered bearings in the mixed friction region (MR), and a following transition to a second load (M.sub.A, with the effect of operation of the sintered bearings in the boundary friction region (GR).

Abstract: The invention relates to a method for removing and installing rolls (2) in a paper machine or the like substantially in the longitudinal direction of the rolls. In the method, an auxiliary displacing means (3) is supported to a substantially horizontal support structure of the paper machine or the like above the roll (2) to be displaced, the auxiliary displacing means being mounted to move along the support structure; one end of the roll (2) to be displaced is fixed to the auxiliary displacing means (3) so as to be suspended from it, and the other end of the roll is supported by a displacing device; and the roll (2) is then moved by the displacing device substantially in the direction of the longitudinal axis of the roll so that the auxiliary displacing means (3) fixed to one end of the roll moves along the support structure (1) while the roll to be displaced moves with it.

Abstract: A method electrically and mechanically interconnects two surfaces of high density first and second semiconductor devices. The first semiconductor device (10) is formed with plug members (22) connected to nodes (18) of its circuit elements (14) and protruding from the first semiconductor device. The second semiconductor device (24) is formed having receptacle members (36) connected to nodes (32) of its circuit elements (28) and protruding from the second semiconductor device. The plug members are inserted into the receptacle member to interconnect the first and second semiconductor devices. The plug members may be removed from the receptacle member to disconnect the first and second semiconductor devices.

Abstract: A magnetic roll for use in roller pairs of a drafting system on a textile machine. Each magnetic roll includes a central pole member having a rare earth magnet positioned on either side thereof. An end pole member is provided adjacent each magnet, and a cot is provided next to each end pole member for gripping and propelling fibers between the roller pairs of the drafting system.

Abstract: The strength and workability of a reinforced composite corrugated body are improved. A corrugated body is produced such that corrugate lines provided with vertically spaced ridges and grooves formed alternately in a sheet material are formed in a smooth meandering waveform in a horizontal direction. The corrugate lines are formed by corrugating rollers to have a substantial amplitude ratio H/L higher than or equal to 0.4 but lower than or equal to 1.4, a substantial meandering ratio D/N lower than or equal to 0.35, a substantial meandering overlapping ratio higher than or equal to 0.5 and a width narrowing ratio i in the advancing direction of the corrugate lines lower than or equal to 8% plus a stretch strain ratio of the sheet material. Sectional shapes of crest and bottom portions of the corrugate lines are formed to be curved or chamfered with a small width. A flat liner is adhered to at least one of the opposite faces of the resultant corrugated body.

Abstract: A coated roll and a method for coating a roll used in a paper machine. Desired surface property values of the roll are fed into a central unit of the coating system and the roll is coated while following a function f.sub.1 (x),f.sub.3 (x) created in the central unit over the distance of the length of the roll. A surface hardness and/or surface profile corresponding to the formed function f.sub.1 (x),f.sub.2 (x) is derived which does not have any steps or other points of discontinuity. The roll is coated with a polymer, preferably polyurethane.