FR2966378A1 - PRINTING UNIT OF A PRINTING MACHINE - Google Patents

Abstract

Printing unit of a printing machine and pressure rollers or printing rolls of such a machine having a first and a second bottom member (1, 2) and a hollow cylinder (3) of a reinforced material by fibers.

Description

FIELD OF THE INVENTION The present invention relates to a printing unit of a printing machine and to a pressure roller or printing cylinder of a printing machine, that is, that is, a cylindrical member of a printing machine. STATE OF THE ART The printing machines as well as the pressure rollers or the printing rolls of such a machine are, in principle, well-known components which do not require a detailed description under the state of the art. Object of the invention The object of the present invention is to improve the known printing units of a printing machine, that is to say the pressure rollers or the printing cylinders or cylindrical members. driques of a printing machine. DESCRIPTION AND ADVANTAGES OF THE INVENTION For this purpose, the subject of the invention is a pressure roller or printing cylinder of a printing machine comprising: a first and a second bottom element, and a first hollow cylinder of a fiber-reinforced material between the first and second bottom members, wherein the bottom members are made of a solid metallic material, the first hollow cylinder is made of a fiber-reinforced material and at least one first partial area of the bottom elements extend over the bottom elements, * in print mode, a functional layer of a fiber reinforced material is provided on the first hollow cylinder where it can be installed on it , * the pressure roll or the printing cylinder is equipped with a functional key of useful width corresponding to a height of 8 or 9 pages of A4 format or a width of 12 or 13 pages of print ssion format A4. The first hollow cylinder between the first and second bottom members is made of a fiber-reinforced material, for example

2 in a material reinforced with glass fibers (also called GFK material) or material reinforced with carbon fibers (also called CFK material). Thus according to the invention the construction of the pressure roller or the printing cylinder is particularly light. Moreover, this makes it possible to design the cylindrical member, that is to say the pressure roller or the impression cylinder, by their mass and their natural frequency so that the natural frequency is well above the rotation frequency of the pressure rollers or printing cylinders during operation of the printing machine. Thus, during the operation of the printing machine, disruptive oscillations resulting from resonance by the natural frequency of the pressure roller or the printing cylinder activated by the rotation frequency of the printing cylinder or the printing cylinder are avoided. pressure roller. Even more the constructive characteristics mentioned above allow a stable connection of the various elements. Finally, thanks to the characteristics stated above, the cylindrical member, that is to say the pressure roller or the printing cylinder or a printing machine with a large production volume, may have a width useful which corresponds to the length or width of 12 or 13 pages printed in A4 format and nevertheless allow a stable operation and with few oscillations for the operation of the pressure roller or the printing cylinder or the machine of 'impression.

The format of a DIN-A4 (abbreviated A4) page is a standard size for the standard paper format in Germany by the German Standards Institute (DIN) according to DIN 476. This German standard served as a basis for the European or international equivalent EN ISO 216 which was adopted in turn in almost all countries. The A4 size corresponds to a page width of 210 millimeters and a page height (length) of 297 millimeters. For the pressure roller of the printing cylinder, an intermediate layer of another material is applied to a first cylinder of fiber-reinforced material as a functional layer.

3 and the first cylinder is made of a material reinforced with fibers. For the pressure roller or printing cylinder, the intermediate layer may contain dyes which give the intermediate layer a color other than that of the functional layer over it or against it. If it is necessary to remove the functional layer for another use of the pressure roller or printing cylinder, it will be easily recognized by this other color than that of the functional layer has been removed completely.

If the removal of the functional layer is done for example by means of a knife working by removal of chips, on a machine such as a lathe, then we will easily recognize the color that appears when the removal of the functional layer is complete, thereby completing the material removal operation. At the same time the intermediate layer prevents the tools from damaging the hollow cylinder reinforced with glass fibers and which are below. According to another feature, for the pressure roller or printing cylinder, the functional layer and / or the intermediate layer have a width greater than that of the first hollow cylinder of a fiber-reinforced material. This makes it possible to cover, in particular, the possible junction between the first hollow cylinder and the bottom elements and to protect it against external influences in order, for example, to prevent the penetration of water or ink into the junction. According to another feature in the pressure roll or impression cylinder, the functional layer and / or the intermediate layer protrude from the first hollow cylinder made of fiber-reinforced material and at least partly also comes over the bottom elements. . The invention also relates to a pressure roller or printing cylinder of a printing machine comprising: - a first and a second bottom element, and - a first hollow cylinder made of a fiber reinforced material, installed between the first and second base elements, in which * the bottom elements are made of solid solid material, * the first hollow cylinder made of a fiber-reinforced material extends at least in a first partial area of the bottom elements above the bottom elements, an intermediate layer covers the first hollow cylinder made of fiber-reinforced material, this intermediate layer being made of a material other than the functional layer and the first hollow cylinder which is made of a material reinforced with fibers. in the printing mode, the functional layer is or can be installed over the intermediate layer, the functional layer and / or the intermediate layer have it is no wider than the first hollow cylinder made of fiber reinforced material.

The invention also relates to a pressure roller or printing cylinder of a printing machine comprising: - a first and a second bottom member, and - a first hollow cylinder made of a material reinforced with fibers between the first and second bottom members, wherein * the first hollow cylinder made of a fiber-reinforced material extends at least in a first sub-area of the bottom members over the bottom elements, * an intermediate layer is provided over the first hollow cylinder of a fiber reinforced material, said intermediate layer being of a material other than the first hollow cylinder of a fiber-reinforced material, or in the printing mode a functional layer is, or may be provided on the first hollow cylinder of a fiber-reinforced material and this functional layer is of a different material than that of the first hollow cylinder made of a reinforced material With the fibers, the functional layer and / or the intermediate layer have a greater width than the first hollow cylinder made of a fiber reinforced material, the bottom elements are at least partly made of a material whose thermal expansion a is less than 10 * 10-6 K-1. According to another feature, the pressure roller or the impression cylinder is characterized in that the coefficient of thermal expansion at least of the first hollow cylinder substantially corresponds to the coefficient of thermal expansion of a partial element of the element. background. The pressure roller or the printing cylinder have bottom elements at least partly made of metallic material having a coefficient of thermal expansion a less than 10 * 10 -6 K-1 and in particular a coefficient of thermal expansion a less than 5 * 10-6 K-1 and more particularly a coefficient of thermal expansion a less than 2.5 * 10-6 K-1. The metallic material is in particular a metal alloy with a nickel content of between 30% and 40%.

In particular, iron-nickel alloys which additionally but not necessarily use cobalt as other element will be used. According to the invention, the coefficient of thermal expansion a of an iron-nickel alloy as a function of the nickel content corresponds, for a nickel content range of between 30% and 40%, to a very high variance of the thermal expansion. of the alloy with respect to the temperature. According to another feature, the pressure roller or the printing cylinder has a functional layer having a useful width corresponding to the length of 8 or 9 pages of A4 format printing or the width of 12 or 13 pages of printing. format A4. As already indicated, the A4 page size is a standardized standard for a paper size that has been standardized in Germany by the German Standards Institute (DIN) by DIN 476. based on the European or international equivalent EN ISO 216 adopted in practically every country in the world. The A4 size corresponds to a page width of 210 millimeters and a page height of 297 millimeters. According to another characteristic, the cylindrical member, that is to say the pressure roll or the impression cylinder comprises a second hollow cylinder concentric with the first hollow cylinder in one

6 material reinforced by fibers and installed between the first and the second bottom element. This is reflected in particular by a lightweight construction of the pressure roller or the printing cylinder. In addition, the pressure roller or the printing cylinder will have a mass and a natural frequency such that this natural frequency will be very above the rotation frequency of the pressure roller or the printing cylinder, which makes it possible to avoid disturbance oscillations related to the resonance for the natural frequency of the pressure roll of the printing cylinder. In addition, the constructive features developed above allow a stable construction of the pressure roll or the impression cylinder. The second hollow cylinder serves as a common axis for reciprocal alignment of the two bottom elements that is to say common geometric axis to receive the bearing forces and resulting bending moments. The eigenfrequencies of the two hollow cylinders must be taken separately and they are preferably chosen to kill beyond the possible range of operating rotational speeds. According to another feature, the pressure roller 20 or the impression cylinder has a second hollow cylinder made of a fiber-reinforced material, for example a glass fiber-reinforced material (abbreviated as GFK material) or a material reinforced with fibers. carbon fiber (abbreviated as CFK material). According to another feature, alternatively, the pressure roll or pressure roll has a second hollow cylinder of steel or other metal alloy. According to another characteristic, the pressure roller or the inner bearing printing cylinder and the bottom elements are composed of at least two partial elements, a first and a second one, installed concentrically and the inner bearings are located in the base elements for rotatably mounting the first sub-elements to the second sub-elements of the bottom elements. This results in a particularly compact mounting.

According to another feature, the cylindrical member, i.e., the pressure roll or the impression cylinder, has a functional layer and / or an intermediate layer extending at least in a second partial region of the elements of the bottom on these and in this second sub-area of the bottom elements, the functional layer and / or the intermediate layer is directly adjacent to the bottom elements. This allows in particular to cover a possible zone or line of junction between the first hollow cylinder and the bottom elements to protect this junction against external influences by avoiding for example the penetration of water or ink in the junction line. Any air inclusions at the junction (junction point or junction line between the bottom member and the hollow cylinder) are also avoided which could have a negative effect on the vulcanization of the rubber such as, for example, bubble formation that would destroy the functional layer / rubber layer. According to another advantageous feature, the pressure roll or the printing roll has a functional layer in the region of the edge of the working width of the functional layer which has a decreasing layer thickness contour. According to another feature for the pressure roll or impression cylinder, the contour of the functional layer is in the area of the bottom elements and the outline of which the edge area of the working width of the functional layer is designed to that the thickness of the functional layer decreases continuously from the thickness of the useful layer to that of the protective layer. This allows in particular a simple way of covering possible lines and junction points in the area of the bottom elements and protecting them against external influences to avoid, for example, the penetration of water or ink into the point or the line. junction. According to another particularly advantageous characteristic, the pressure roller or the impression cylinder has a functional layer whose thickness reaches to the edge of the bottom elements.

The invention also relates to a printing unit of a printing machine comprising: - at least one printing unit with printing cylinders and at least one inking unit with pressure rollers, in which - the printing unit has a usable width corresponding to the height of 8 A4-size printing pages or the 12-page A4-size printing width, - at least one pressing roll has a useful peripheral surface corresponding to a size of 96 printing pages lying down or standing in A4 format, and - at least one pressure roller of the inking unit and / or at least one pressing cylinder of the printing unit are made as indicated above.

The ink group may further include a wet group. The invention further relates to a printing unit of a printing machine comprising: - at least one printing unit with printing cylinders and at least one inking unit with pressure rollers, - the Inking unit being designed with a usable width which corresponds to the length of 9 pages of A4 size or 13 pages of A4 size printing, - at least one printing cylinder has a corresponding useful peripheral surface 104 pages of coated or standing A4 format printing, and - at least one pressure roller of the inking unit and / or at least one impression cylinder of the printing unit are made as described above.

The ink set may also further comprise a wet group. For the printing unit the geometric axis of the printing cylinders of at least one of the printing units is on a straight line. This results in a particularly stable arrangement, in particular because of the mutual support of the cylinders and a tendency

9 reduced oscillations because the generated couples compensate at least partially. This also translates into a simple and compact construction. According to a variant in the case of the printing unit, the geometric axes of a first pair of printing cylinders and the geometric axes of a second pair of printing cylinders of at least one of the printing groups are on parallel lines. Drawings The present invention will be described hereinafter with the aid of embodiments of printing cylinders and pressure rollers, shown schematically in the accompanying drawings in which: - Figure 1 shows in its parts a) and b ) an embodiment of a printing unit or module; FIG. 2 shows in its parts a) and b) a printing cylinder for a printing unit according to FIG. 1; FIG. its parts 3a) 3b) a variant of printing cylinders for the printing unit of FIG. 1; FIG. 4 is an axial sectional view of an example of a pressure roller or a printing cylinder on FIG. 5 shows in axial section an alternative embodiment of a pressure roller or a printing cylinder according to the invention; FIG. 6 shows in axial section an alternative embodiment of a pressure roller or printing cylinder according to the invention, - Figure 7 is a graph giving the coefficient of thermal expansion a of an iron-nickel alloy as a function of its nickel content. Embodiment Description of the Invention: Fig. 1 shows in its parts a) and b) each time a printing unit 20 of a printing machine having a printing unit 23 with printing cylinders. 24 and each time an inking unit 21 per pair of printing cylinders, each consisting of a plate cylinder and a transfer cylinder.

The printing unit 23 is designed for a useful width BD (as shown in FIG. 2) which corresponds to the length of 8 A4-size printing pages or the 12-page A4 printing width (the pages of printing are designated in Figure 2 in its parts a) and b) by the reference DIN-A4). At least one printing cylinder 24 has a useful peripheral surface that corresponds to a size of 96 A4 printing pages standing or lying down. At least one of the printing cylinders 22 of the inking unit 21 and at least one printing cylinder 24 of the inking unit 23 is made according to one of FIGS. 4 to 6. The printing cylinder and the pressure roller are cylindrical organs. The printing unit 23 may also have a useful width BD (as shown in FIG. 3), which corresponds to the ionizer of 9 A4-size printing pages or the 13-page format printing width. A4 (the print pages are marked in FIG. 3 each time by the reference DIN-A4). At least one printing cylinder 24 has a useful peripheral surface that corresponds to a size of 104 A4 standing print pages or 108 A4 coated printing pages. At least one printing cylinder 22 of the inking unit 21 and at least one printing cylinder 24 of the inking unit 23 are made as shown in FIGS. 4 to 6. In a variant, the impression cylinders 24 may also be have a periphery corresponding to the width of 4 pages in DIN-A4 format. A dual printing unit equipped with such printing cylinders 24 can thus print at each rotation of the cylinder, 64 pages in DIN-A4 format. As in the manufacturing process, a printing product is cut to the desired format only after the actual printing of the paper, in the case of several pages on a printing cylinder is provided in particular an edge that exceeds. This means that for a printing product in DIN-A4 format (height by width = 297 x 210 millimeters) and which corresponds for example to 13 times its width juxtaposed on a printing cylinder, the cylinders

It will have a printable width of 13 x 220 mm ie 2,860 mm. This corresponds to a preferential edge of 5 millimeters on both sides. But we can also provide other lengths of overtaking. This applies in a similar way to the peripheral direction. For the printing unit 20 according to FIG. 1 b), the geometric axes M1 and M2 of the printing cylinders 24 of the printing unit 23 are located on a line G. This results in a particularly stable arrangement, in particular because the mutual support of the printing cylinders 24 and the reduction of the tendency to oscillation because the generated couples are at least partly compensated reciprocally. This makes it possible to further stabilize straightforward arrangements with very long printing cylinders 24 in a simple manner. And the more the construction is simple and compact.

In the case of the printing unit 20 according to FIG. 1 a), the geometric axis M1 of the lower pair of the printing cylinders 24 and the geometric axis M2 of the upper pair of printing cylinder 24 of the printing group 23 lie on parallel lines G 1, G 2.

Figures 4 to 6 show different embodiments of pressure rollers or printing cylinders for a printing machine. Figures 4, 5 and 6 each show an alternative embodiment of a pressure roller 22 or a printing cylinder 24 that is to say a cylindrical member of a printing machine comprising a first and second bottom members 1, 2 and a first hollow cylinder 3 installed between the first and second bottom members; the hollow cylinder is a material reinforced with fibers; the bottom elements 1, 2 are made of solid solid metal material. The first hollow cylinder 3 of fiber-reinforced material extends over at least a first partial area 4 of the bottom elements 1, 2 from the bottom elements 1, 2. In the printing mode, a functional layer 6 , a fiber reinforced material is applied to the first hollow cylinder 3. The functional layer 6 can be connected to the first cylinder

12 hollow removably or also integrally (secured by the mass). This may be for example a rubber layer, a rubber fabric, a rubber tube, a rubber fabric with a support plate or a metal printing plate. In place of a homogeneous rubber layer, it is also possible to have a sandwich layer composed of several layers of rubber (where appropriate porous rubber) and fabric. The impression cylinder or roller 22 or the pressure cylinder 24 is designed with a useful width B for its functional layer 6; this width corresponds to the length of 8 or 9 pages of A4 for-mat printing or the width of 12 or 13 pages of A4 format printing. In the embodiments of FIGS. 4 and 5, the first hollow cylinder 3 made of a fiber-reinforced material carries an intermediate layer 5 made of a material other than the functional layer 6 and the first hollow cylinder 3 made of a material reinforced by fibers. fibers. Intermediate layer 5 contains a colorant (e.g., color pigments embedded in the layer) which gives the intermediate layer 5 a color other than that of the functional layer 6 which is underneath. If it is necessary to remove the functional layer 6 for a new use of the pressure roller 22 or the impression cylinder 24, it will be readily recognized at this other color whether the functional layer 6 has been completely removed. If the removal of the functional layer 6 is done for example using a tool or a machine removing material such as a lathe, it is easily recognized the appearance of the other color if the removal of the functional layer is complete and that the removal operation is complete. At the same time, the intermediate layer 5 prevents tools from damaging the hollow cylinder 3 reinforced by fibers, which is underneath. In the embodiment of FIGS. 4 and 5, the functional layer 6 and the intermediate layer 5 are wider than the first hollow cylinder 3 made of a material reinforced with fibers. The functional layer 6 and / or the intermediate layer 5 thus extend over the first hollow cylinder 3 made of a material reinforced with fibers to

13 at least partly on the bottom members 1, 2 especially on the first bottom member T1 among the bottom members 1, 2. The junction point between the first cylinder 3 and the bottom members 1, 2 or 1 separating element T1 will be covered and protected against external influences; this avoids, for example, the penetration of water or ink into the junction. It is furthermore possible to avoid possible air inclusions in the junction (junction between the bottom element and the hollow cylinder) which could have negative effects during the vulcanization of the rubbery coating, such as, for example, the development of bubbles. which can destroy the rubber layer, consisting of the functional layer. The bottom elements 1, 2 and at least their first partial elements T1 are made of a metallic material having a coefficient of thermal expansion a less than 10 * 10 -6 K -1, in particular a thermal expansion coefficient a less than 5 * 10-6 K-1 and even more particularly a coefficient of thermal expansion a less than 2.5 * 10-6 K-1. For this purpose, a metal material consisting of a metal alloy having a nickel content of between 30% and 40% will be used. In particular, these are iron-nickel alloys which may additionally but not necessarily include cobalt constituting another element. Figure 7 shows the curve of the coefficient of thermal expansion a of an iron-nickel alloy as a function of the nickel content. Thus in the range with a nickel content of between 30% and 40% there will be a very wide invariance of the coefficient of thermal expansion of the alloy relative to the temperature variation. The pressure roller 22 or the printing cylinder 24 according to FIGS. 4, 5 or 6 is designed for a functional key 6 with a useful width B having a length of 8 or 9 A4 printing pages or a width of 12 or 13 A4 printing pages. The pressure roller 22 or the impression cylinder 24 each have a second hollow cylinder 9 concentric with the first hollow cylinder 3 and made of a fiber-reinforced material and installed between the first and the second bottom members 1, 2. the embodiment of FIG. 5, the second hollow cylinder is made in one

14 fiber reinforced material. In the embodiments of FIGS. 4 and 6, the second hollow cylinder 9 is made of steel. The pressure roller 22 or the printing cylinder 24 according to Figures 4 and 6 each have inner bearings L1, L2; the bottom elements 1, 2 are composed of at least two partially concentric first and second elements T1, T2; the inner bearings L1, L2 are housed in the bottom elements 1, 2 and the inner bearings L1, L2 serve to receive in rotation the first partial elements T1 with respect to the second partial elements T2 among the bottom elements 1, 2. Figure 4 and Figure 6, there is provided an inner bearing L1. According to Figure 5 there are two inner bearings L1, L2; the second inner bearing L2 may also be constituted by a roller bearing to enable the pressure roller 22 or the impression cylinder 24 to move in the axial direction, for example by effecting an oscillating movement. The first hollow cylinder 3 is respectively integrally connected in rotation to the first partial element T1 of the bottom elements 1, 2 and the second hollow cylinder 9 is connected to the second partial element T2 of the bottom elements 1, 2. The functional layer 6 and the intermediate layer 5 of the embodiments of Figures 4 and 5 extend in the second partial area 7 of the bottom members 1, 2 over the bottom members 1, 2; in this second partial zone 7 of the bottom elements 1, 2, the intermediate layer 5 comes directly against the bottom elements 1, 2. If this intermediate layer 5 did not exist, in this second partial zone 7 of the bottom elements 1 , 2, the functional layer 6 would come directly against the bottom elements 1, 2. The functional layer 6 comprises each time in the marginal zone of its useful width, a contour 8 of decreasing layer thickness. It is provided that the contour 8 of the functional layer 6 is in the region of the bottom elements 1, 2. In this embodiment according to FIGS. 4 and 5, it is not foreseen that the contour 8 of the the edge area of the working width of the functional layer 6 is designed so that the thickness of the functional layer 6 decreases continuously from the useful layer thickness d1 to the thickness d2 of the protective layer; the functional layer

Fig. 6 is with layer thickness d2 to edge R of bottom members 1, 2.5 NOMENCLATURE 1 Bottom element 2 Bottom element 3 First hollow cylinder 4 First partial zone 5 Intermediate layer 6 Functional layer 7 Second partial zone 8 Contour of layer 6 9 Second hollow cylinder 20 Printing unit of printing machine 21 Inking unit 22 Pressure roller 23 Printing unit 24 Printing cylinder A4 Format B Effective width of functional layer BD Width of the printing group G Right of the geometric axes M1, M2 of the impression cylinders G1, G2 of the print group 23 Parallel lines for the pairs of printing cylinders L1, L2 24 of the printing unit 20 Inner bearings T1, T2 Partial elements of the base elements 1, 2 M1, M2 Geometric axes dl Thickness of the useful layer d2 Thickness of the protective layer R Edge of the base elements 1, 235

Claims (1)

CLAIMS1 "Cylindrical member of a printing machine, in particular a pressure roller or printing cylinder, comprising: a first and a second bottom element, 2), and a first hollow cylinder (3) of a fiber reinforced material between the first and second bottom members (1, 2), wherein * the bottom members (1, 2) are made of a material solid metal, * the first hollow cylinder (3) made of a fiber-reinforced material extends at least in a first partial zone (4) of the bottom elements (1, 2) over these bottom elements (1). , 2), * in the printing mode, a functional layer (6) of a fiber reinforced material is installed on the first hollow cylinder (3), the cylindrical member is provided with a functional layer (6) of useful width (B) corresponding to a height of 8 or 9 pages of A4 size printing or a width of 12 or 13 pages of A4 format printing. 2 »cylindrical member according to claim 1 characterized in that an intermediate layer (5) covers the first hollow cylinder (3) of a fiber-reinforced material, this intermediate layer being made of a material other than the functional layer (6) and the first hollow cylinder (3) is made of a fiber reinforced material. 3 »cylindrical member according to claim 2, characterized in that the intermediate layer (5) contains dyes giving the intermediate layer (5) a color other than that of the functional layer (6) which is above or against it. 4 »cylindrical member according to claims 2 or 3, characterized in that the functional layer (6) and / or the intermediate layer (5) have a width greater than the first hollow cylinder (3) of fiber-reinforced material. Cylinder member according to Claim 4, characterized in that the functional layer (6) and / or the intermediate layer (5) extend over the first hollow cylinder (3) in a fiber-reinforced material, overflowing at least in part on the bottom elements (1, 2). 6 »Cylindrical member of a printing machine, in particular a pressure roller or a printing cylinder, comprising: - a first and a second bottom element (1, 2), and - a first hollow cylinder (3) made of a reinforced material of fibers, installed between the first and second bottom members (1, 2), wherein * the bottom members (1, 2) are made of a solid solid material, * the first hollow cylinder (3) of a material reinforced with fibers extends at least in a first partial region (4) of the bottom elements (1, 2) over the bottom elements (1, 2), an intermediate layer (5) covers the first cylinder hollow (3) of fiber-reinforced material, said intermediate layer being of a material other than the functional layer (6) and the first hollow cylinder (3) which is made of fiber-reinforced material, printing the functional layer (6) is installed over the intermediate layer (5), * the layer functional (6) and / or the intermediate layer (5) have a width greater than the first hollow cylinder (3) of a fiber-reinforced material. 7 »Cylindrical member of a printing machine, in particular a pressure roller or printing cylinder, comprising: - a first and a second bottom element (1, 2), and 19 a first hollow cylinder (3) made of a reinforced material by fibers between the first and second bottom members (1, 2), wherein * the first hollow cylinder (3) of a fiber reinforced material extends at least in a first partial area (4) of the elements base (1, 2) above the bottom elements (1, 2), an intermediate layer (5) is provided over the first hollow cylinder (3) of a fiber-reinforced material, this intermediate layer being of a material other than the first hollow cylinder (3) of a fiber-reinforced material or in a printing mode a functional layer (6) is provided over the first hollow cylinder (3) of a material reinforced with fibers and this functional layer is in a different material than that of the first hollow ply (3) of a fiber-reinforced material, * the functional layer (6) and / or the intermediate layer (5) have a greater width than the first hollow cylinder (3) of a fiber-reinforced material, the bottom elements (1, 2) are at least partly made of a material whose coefficient of thermal expansion a is less than 10 * 10-6 K-1. 8 »cylindrical member according to one of claims 1 to 7, characterized in that the coefficient of thermal expansion at least of the first hollow cylinder (3) substantially corresponds to the coefficient of thermal expansion of a partial element (Tl) of the bottom element (1, 2). 9 »cylindrical member according to any one of claims 1 to 8, characterized in that the bottom elements (1, 2) are at least partly made of a metallic material and in particular a metal alloy with a nickel content included between 30% and 40%. 10 "Cylindrical member according to one of claims 6 to 9, characterized in that the 15 cylindrical member (22, 24) is designed for a functional layer (6) having a useful width corresponding to the length of 8 or 9 pages d A4 or 12-page or 13-page A4 size print. 11 »cylindrical member according to one of claims 1 to 10, characterized in that the cylindrical member (22, 24) has a second hollow cylinder (9) concentric with the first hollow cylinder (3) of a material reinforced with fibers and installed between the first and second bottom members (1, 2). 12 »cylindrical member according to claim 11, characterized in that the second hollow cylinder (9) is made of a material reinforced with fibers. 13 »cylindrical member according to claim 11, characterized in that the second hollow cylinder (9) is steel. Cylindrical member according to one of claims 1 to 10, characterized in that the cylindrical member (22, 24) has internal bearings (L1, L2), the bottom members (1, 2) are formed of at least two concentric partial elements, namely a first and a second partial element (T1, T2), - the inner bearings (L1, L2) are in the bottom elements (1, 2), and - the Inner bearings (L1, L2) are used for rotatably mounting the first sub-elements (T1) relative to the second sub-elements (T2) of the base elements (1, 2). A cylindrical member according to claim 14, characterized in that the first hollow cylinder (3) is integrally connected in rotation to the first sub-element (T1) of the bottom elements (1, 2) and the optional second hollow cylinder ( 9) is integrally connected in rotation to the second partial element (T2) of the bottom elements (1, 2). 16 »cylindrical member according to one of claims 1 to 15, characterized in that the functional layer (6) and / or the intermediate layer (5) extend in at least a second partial zone (7) of the elements of bottom (1, 2) over the bottom elements (1, 2), and in this second sub-zone (7) bottom elements (1, 2), the functional layer (6) and / or the layer intermediate (5) are directly adjacent to the bottom elements (1, 2). 17. A cylindrical member according to one of claims 1 to 16, characterized in that the functional layer (6) has in the edge region of the working width (B) of the functional layer (6) an outline (8). de-growing layer thickness. 18. A cylindrical member according to claim 17, characterized in that the contour (8) of the functional layer (6) is located in the region of the bottom elements (1, 2) and this contour (8) is designed in the an edge region of the working width (B) of the functional layer (6) so that the thickness of the functional layer (6) decreases continuously from the thickness (d1) of the useful layer to the thickness (d2) of the protective layer. 19. A cylindrical member according to claim 18, characterized in that the functional layer (6) extends with the thickness of the protective layer (d2) to the edge (R) of the bottom member (1). , 2). 20 »Printing unit (20) of a printing machine comprising: - at least one printing unit (23) with printing cylinders (24) and at least one inking unit (21) with pressure rollers (22), in which - the printing unit (23) has a useful width (BD) corresponding to the height of 8 A4-size printing pages or the 12-page printing width of A4 format, - at least one pressure cylinder (24) has a useful peripheral surface corresponding to 96 A4-coated or end-of-page printing pages, and - at least one pressure roller (22) of the inking unit (21). ) and / or at least one printing cylinder (24) of the printing unit (23) are made according to any one of claims 1 to 18. 21 »Printing unit (20) of a printing machine printing comprising: - at least one printing unit (23) with printing cylinders (24) and at least one inking unit (21) with pressure rollers (22), - the ink pad (23) being designed with a useful width (BD) which corresponds to the length of 9 A4-size printing pages or the 13-page A4-printing width, - at least one printing cylinder ( 24) has a useful peripheral surface corresponding to 104 A4 standing print pages or 108 A4 coated paper printing pages, and 25 - at least one pressing roll (22) of the inking unit (21) and / or at least one impression cylinder (24) of the printing unit 23 is made according to claims 1 to 18. 22 »Printing unit of a printing machine according to one of the claims 20 or 21 , characterized in that the geometric axes (M 1, M2) of the printing cylinders (24) of at least one of the printing units (23) are on a straight line. 23 23 »Printing unit of a printing machine according to one of claims 20 or 21, characterized in that the geometric axis (M 1) of a first pair of printing cylinders (24) and the geometric axis (M2) of a second printing cylinder pair (24) of at least one of the printing groups (23) is on parallel lines (G1, G2). io