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    • 专利摘要:
    method for manufacturing an embossing roller set. in the method for manufacturing embossing rollers for a device for embossing packaging materials comprising a set of at least two embossing rollers of which one is driven, and by which the set of embossing rollers comprises a male roller having a male surface structure including structural elements and/or logo structures and a female roller having a female surface structure which is associated with the surface structure of the male roller for the embossing operation common with the male roller , the female surface structure is produced independently of an associated male surface structure produced previously or physically pre-existing. together with a high precision embossing, this allows to create a very wide variety of embossing structures, on the one hand, and to use a very large number of distinct materials, on the other hand, as well as to reduce shear stresses in the embossed material. in relief.
    公开号:BR112014025767B1
    申请号:R112014025767-1
    申请日:2013-03-22
    公开日:2021-06-22
    发明作者:Charles Boegli
    申请人:Boegli-Gravures S.A.；
    IPC主号:
    专利说明:

    [001] The present invention relates to a method for manufacturing a set of embossing rollers for a device for embossing packaging materials having two rollers, according to the introduction of claim 1, and to a set of embossing rollers manufactured in accordance with the aforementioned method, as well as the use of these embossing rollers in a device for embossing packaging materials.
    [002] Thin packaging sheets for the tobacco industry or the food industry have been embossed by means of embossing roller devices for some time, the thin sheets being, for example, so-called inner linings which are wrapped around a number of cigarettes, or packaging materials for chocolate, butter, or similar foods, electronic components, jewelry, or watches.
    [003] Originally, so-called internal linings consisted of thin pure aluminum sheets such as, for example, domestic thin sheets, and embossing was achieved by passing them between two rollers of which at least one was provided with a relief, the so-called logos. Until about 1980, a pair of rollers like this most often consisted of a steel roller on which an embossment was formed and an opposing roller of a resilient material, eg rubber, paper or acrylic glass. By printing the relief of the male roller against the opposite roller = female roller, mirror image printing was produced.
    [004] For more sophisticated logos, the relief of the male roller was transferred to a layer on the female roller and the notches corresponding to the raised parts were carved or otherwise carved. Recently, laser has also been used for this engraving process.
    [005] Since this manufacture of female rollers is demanding, after about 1980, when US 5,007,271 to the applicant of the present invention was filed, a so-called pin-up/pin-up system has been used crescently where two identical steel rollers having a very large number of small teeth lock and emboss the paper passing through them. Logos are produced by partially or fully removing teeth on a roller.
    [006] Furthermore, it was thus possible to produce so-called satin where matte and thus also more precious surface appearance was produced by the large number of small indentations created by the teeth.
    [007] EP 0 114 1691 discloses an embossing device which is situated after a printing device and which has a male metal embossing roller and an opposite female roller made of resilient material, by which the depressions on the female roller are greater than the elevations on the male roller. This device is not intended for embossing without prior printing. The manufacturing method of both rollers is not disclosed apart from the fact that a laser can be used to fabricate the depressions.
    [008] US 5 269 983 A also discloses a pair of rollers with a male metal roller and a resilient female.
    [009] DE 10 2005 056627 A1 discloses a method and device for producing blanks for an inner lining for a group of cigarettes, comprising a pair of embossing rollers, having elevations in a roller and corresponding depressions on the other roller. There is no disclosure regarding the method of manufacturing the pair of rollers.
    [0010] DE 43 42 737 A1 discloses a method and device for the production of internal lining blanks embossed with a pair of rollers, in which one roller is provided with an engraving on a part of its circumference, while the opposite roller is provided with an engraving on its entire circumference. There is no suggestion regarding the manufacturing method of embossing rollers.
    EP 2 327 502 A1 of the same applicant discloses a method and apparatus for structuring embossing rollers by means of a laser device.
    [0012] EP 1 658 965 A1 discloses an embossing device comprising two pairs of embossing rollers, a pair for satining a thin blade and a second pair for embossing graphics. The second pair of rollers may comprise a male roller and a resilient female roller, or rollers in the so-called pin-up/pin-down configuration. There is no disclosure of a method of manufacturing such rollers.
    [0013] In parallel to developments in embossing techniques, that is, in the manufacture of embossing rollers, a change has also taken place with reference to packaging materials in which the originally used thin all-aluminum foil has been replaced by thin sheets of paper whose surfaces have been coated for environmental considerations with increasingly thinner metal layers, the latter having been applied in recent times by means of sputtering. Currently, the metal layer on the inner linings has been further reduced and will eventually be omitted altogether in the future.
    [0014] At the same time, attempts are being made to replace the classic packaging system, where cigarettes are packaged in inner linings and this package is inserted into a cardboard package, by so-called soft packages where only a thin blade wrapper is provided which simultaneously fulfills the functions of keeping the cigarettes moist and protecting them against external olfactory influences, on the one hand, and of providing a certain rigidity for the mechanical protection of the cigarettes, on the other hand.
    [0015] Developments in the manufacture of embossing rollers, particularly those made known to the applicant of the present invention, see, for example, US 7 036 347, have led to an ever-increasing scope of decorative effects on internal linings and a greater diversity of advertisements that have been used not only in the tobacco industry, but also in the food industry. Lately, however, efforts are being made to strongly restrict or completely eliminate advertisements for tobacco products in such a way that it will no longer be possible to emboss internal linings with effective designs in a promotional fashion for trainer extension. Therefore, possibilities are being sought to produce new decorative effects without using eye-appealing embossed engravings, gold hoops or such decorations.
    [0016] New possibilities for product identification are also being considered, which have mainly been assured in internationally established trademarks so far. Currently, so-called tactile effects are being used that are created through special surface structures of papers or through special engravings. Both textiles and papers are provided with optimized colors of expandable IR absorption that create so-called embossed pseudo-engravings. The purpose of this technique can be a noticeable relief formation, for example, to create a velvety surface or a matte finish effect. In applications for safe food purposes, however, wetting techniques are questionable.
    [0017] In the case of tactile surfaces, the consumer identifies the product through its tactile sense. Furthermore, this can result in Braille writing or produce hidden security features. Information produced in a tactile mode, for example, can be read using laser radiation based on surface-dependent reflectance. Furthermore, recent developments aim to produce audible effects that are produced by friction on the surface.
    [0018] Another sector of the tobacco industry is involved with the cigarette itself, for example, with its part to put in the mouth, also called tip.
    [0019] As a result of the ever more restrictive legislation regarding tobacco products and the push for additional features such as different tactile, acoustic or optical features, on the one hand, and the continually increasing diversity of different packaging materials such as blades aluminum foil, metal coated papers, filter papers, hybrid thin foil, plastic thin foil, cardboard or cardstock, on the other hand, conventional pin-up/pin-up embossing rollers where both the driven roller and the Opposite rollers have a large number of teeth yet are fully and successfully usable for embossing internal coatings, but they reach their limits with reference to the aforementioned purposes.
    [0020] Although known roller systems comprising a male roller having male structures and a female roller having female structures that are inversely matched may extend the scope of decorative elements, their production is very high cost and above all time consuming because of of pairwise and paired fabrication, so its fabrication for industrial embossing, for example, of metallized inner linings for the tobacco industry is not suitable.
    [0021] Furthermore, refined embossing can only be ensured with a very expensive fabrication of such rollers. Furthermore, when a male roller and an inversely matched female roller are used in this context, the thin blade between them will be shredded to such an extent that stresses arise in the transverse direction which are not acceptable for tobacco product papers. Furthermore, a barely controllable limit for drilling is reached and very high pressures are required for a high speed in-line process although embossing times are in the millisecond range. In the end there is a tendency to use thicker papers.
    [0022] An object of the invention arising from the foregoing is to provide a method for manufacturing a set of embossing rollers that allow refined embossing of the most distinct surface structures described of the indicated materials of the most distinct types in a process online on a packaging line. In this context, the term "refined embossing" means that the contours of the refined embossing structures of the rollers exhibit a total linear error of less than +/- 10 µm and an angular error of less than 5°. This objective is achieved by the method according to claim 1.
    [0023] Another objective of the invention is to maintain deformations of embossed thin blades during embossing of structures arranged regularly and evenly across the direction of displacement so small that the rollers can be used in an in-line process in a line of packaging. This objective is achieved by the method according to claim 6.
    [0024] Another objective is to produce a set of rollers like this on an industrial scale in the required precision and numbers. This object is achieved by the method according to claim 10. Further objects and advantages, such as the fabrication of pairs of rollers to produce pleats, will become apparent from the dependent claims and the following description.
    [0025] The invention will be explained in more detail below with reference to drawings of exemplary embodiments.
    [0026] Figure 1 schematically shows a set of pin-up/pin-up type embossing rollers according to the prior art in an embossing device, both rollers having teeth protruding from the cylinder;
    [0027] Figure 2 schematically shows a set of embossing rollers of the pin-up/pin-down type according to the prior art, the female roller = pin-down roller being inversely projected corresponding to the male roller = pin roller up;
    [0028] Figure 3 schematically shows a set of embossing rollers of the male and female roller type according to the invention;
    [0029] Figure 4 shows a variant of the embodiment of the set of embossing rollers of Figure 3;
    [0030] Figure 5 shows a variant of additional modality of the set of embossing rollers of Figure 3;
    [0031] Figure 6 shows three different enlarged views of a cutaway of the male roller of the embossing assembly of Figure 5;
    [0032] Figure 7 shows a variant of the embodiment of the set of embossing rollers of Figure 5;
    [0033] Figure 8 shows a variant of additional modality of the set of embossing rollers of Figure 3;
    [0034] Figure 9 shows a laser system for producing male and female roller structures according to the invention;
    [0035] Figures 10 to 16 show variants of modality of structures on embossing rollers according to Figure 3;
    [0036] Figures 17 to 20B show schematic sectional views of embodiments of male and female structures that are not inversely matched;
    [0037] Figures 21 to 35 show variants of embodiment of pairs of rollers having zones to produce folding grooves;
    [0038] Figure 36 schematically shows a first exemplary embodiment of a quick-change device for rollers according to the invention in a perspective view;
    [0039] Figure 37 shows the assembled device of Figure 21 in a sectional view;
    [0040] Figure 38 schematically shows a second exemplary embodiment of a quick-change device for rollers according to the invention in a perspective view;
    [0041] Figure 39 schematically shows a third exemplary embodiment of a quick-change device for rollers according to the invention in a perspective view; and
    [0042] Figure 40 schematically shows an additional exemplary embodiment of a quick-change device for rollers according to the invention in a perspective view.
    [0043] Figure 1 shows an embossing device 1 according to the prior art with a set of two rollers 2 and 3 of the pin-up/pin-up type. In this configuration, the steel cylinders comprise projecting teeth 4 which are generally pyramidal and have a square or rectangular base. In cigarette packaging lines and other packaging lines, such rollers of the applicant of the present invention have been used for over twenty years, the shaft 5 of the driven roller 2 being fixedly supported while the opposite roller 3 is driven and synchronized by the driven roller. In a known mode, an embossing device like this can comprise more than two embossing rollers, for example an embossing roller and two opposing rollers.
    [0044] In this case, the axis 5 of the opposite roller 3 is advantageously movable in all three dimensions in such a way that one tooth of one roller can fit between four teeth of the other roller and an auto-synchronization without slipping is possible. In order to produce logos and authentication features, teeth of the driven roller are removed completely or only partially, thereby creating an image that changes according to the incident light angle and the viewer's viewing angle. Furthermore, it is known to create authentication features on top or sides of teeth by means of micro-engravings or alternatively to remove or modify certain teeth in a predetermined arrangement.
    [0045] For producing authentication features or decorations on inner linings, ie on metal coated paper, pin up/pin up rollers are very well suited and have been used successfully for decades. As mentioned in the introduction, both the greater demands regarding embossing accuracy and adaptations to an ever-increasing diversity of packaging materials such as synthetic thin sheets, hybrid thin sheets, cardboard or cardstock, and the more restrictive regulations expected in advertisements and the new embossing types related to this reveal the limits of pin-up/pin-up embossing roller devices.
    [0046] In addition to devices using pin up/pin up rollers, ie two or multiple male rollers, embossings have also been performed with male and female rollers or, as illustrated in Figure 2, with so-called pin-up/pin-down roller pairs.
    [0047] The device 7 according to Figure 2 comprises the two rollers 2 and 8 where the male roller 2 can be the same as in Figure 1 while the female roller 8 is a so-called pin-down roller and the notches 9 correspond to teeth 4 on roller 2 in an inversely corresponding fashion. As in Figure 1, roller 2 is driven by drive 6 while roller 8 is driven by teeth 4. In order to ensure a smooth embossing operation, the teeth and notches have to be machined and adjusted. to others very precisely.
    [0048] First the male roller 2 is manufactured and brought into contact with a female roller steel cylinder in such a way that the teeth of the male roller are reproduced on the female roller cylinder, and a layer of photo or photo varnish. wax or the like is generally applied to the female roller roller. Subsequently, the notches 9 in the female roller cylinder corresponding to the teeth 4 are carved, generally by means of engraving. It is also known, however, to carve the grooves on the female roller either mechanically or by means of a laser system.
    [0049] Based on these two general types of embossing rollers it is known to form, on their hard surfaces, a very large number of signs, images, letters or the like, generally referred to as "logomarks", as well as security features or authentication features that are often invisible to the naked eye and are readable by a suitable optical device.
    [0050] Because of the very complex technology required for manufacturing a pair of male and female rollers according to the prior art, the application of the latter for industrial purposes is very limited. Generally speaking, such systems are made to specification or used for special purposes. Furthermore, a conventional male and female roller system having inversely corresponding structures suffers from the serious disadvantage, among others, that particularly after embossing row structures the thin blade will exhibit a distortion in the transverse direction which makes its subsequent processing into a very difficult packing line. Furthermore, the resulting shear stresses can cause the thin blade to be pierced, thereby making it unsuitable for use in the food or tobacco industry.
    [0051] Based on the above description, a primary requirement for a substantial improvement of embossing possibilities and quality and especially for an application in the in-line process is that the surface structures of rollers, particularly of female rollers, can be manufactured in greater diversity as well as more rationally and in particular more precisely. Whereas accuracy can be ensured according to the prior art through very expensive engraving or mechanical machining procedures, this is not the case for rational and so also for faster fabrication of male and female rollers in a wide variety of surface structures.
    [0052] In addition, another requirement is to adopt measures in order to reduce the transversal stresses in the thin embossed lamina, which appear more often with inversely corresponding structures, to such an extent that they no longer hinder subsequent processing.
    [0053] One solution is to model the surface structures of the rollers of a set independently of each other instead of first modeling the male roller and then the female roller in a physically dependent relationship. Currently, this is preferably achievable with the required precision and within the required production time by means of a suitable laser system that allows to manufacture not only male rollers but also female rollers rationally, accurately and above all in one wide variety of shapes and independently of each other.
    [0054] It has been recognized that the individual fabrication of male and female rollers allows to achieve a reduction in shear stresses because of the fact that the female structures are not inversely matched, that is, they do not exactly match the associated male structures. Because of the fact that the dimensions and shapes of the male structures, eg teeth, do not exactly match those of the grooves on the female roller, not only the quality of the embossing is improved, but also a sufficient reduction in shear stresses in the blade embossed thin is achieved.
    [0055] Especially in the case of embossing two continuous pointed blades on respective rollers, this can cause bowing of the thin continuous blade which can have consequences particularly with regard to the cutting operation. According to WO-2011/098376 to the applicant of the present invention, which refers to pin up/pin up rollers exclusively, this problem can be solved in that the logo lines on the two continuous point blades are arranged in mutually offset positions. The result is that tensions are not created when the continuous nose blades are being cut and that the continuous nose blade portions can subsequently be glued around the mouthpiece portion without a problem to form a tip where no seam is left. visible.
    [0056] In the case of male and female rollers according to the invention, this applies not only for embossing continuous relatively narrow edged blades, but more generally for embossing structures arranged in rows.
    [0057] Figure 3 shows a schematic illustration of an embossing device 10 according to the invention comprising a male roller P11 and a female roller M11 as well as an enlarged illustration of their surface structures, where the rhombic coarse structures GP1 and GM1 are shown, see also Figures 10 to 16.
    [0058] Since the coarse structures are not teeth, the driving force is transmitted from the male roller P11 which is driven by the belt drive 6 to the female roller M11 through the sprockets 39 and 40,
    [0059] In the embodiment variant of Figure 4, the rollers P11E and M11E exhibit a coarse GPE and GME structure consisting of the capital letter "E".
    [0060] In the mode variant of Figure 5, the P11W and M11W rollers exhibit the same GPE and GME coarse structure consisting of the capital letter "E" as well as a W badge. In Figure 6, this W badge on the P11 male roller is shown in different views: in Figure 6A in a top view, in Figure 6B in a perspective view and in Figure 6C in a sectional view.
    [0061] Figure 7 shows a variant of the modality of the pair of rollers in Figure 5 where the two rollers P11B and M11B are provided, in addition to the "E" and emblem shapes, with the positioning marks 27 and 28 that allow to synchronize the rollers and the material embossed by means of a camera.
    [0062] Figure 8 shows a pair of embossing rollers P11L and M11L having no structures except the emblem and which are also provided with markings 27 and 28.
    [0063] In Figure 9 an exemplary laser system is illustrated schematically which allows to produce the coarse and refined structures shown in Figures 10 to 16 which are suitable for a continuous refined engraving = macrostructuring process. The illustrated laser device L12 comprises a laser 12 which is connected to a control circuit 13 which controls the laser 12 and a deflection unit 14 which may comprise beam splitters as well as acoustic-optical or electrical-optical modulators or polygon mirrors . The deflection unit 14, the focusing optics 15 and the deflection mirror 16 form the recording unit 17 which is linearly displaceable on the X axis as symbolically indicated by the arrow X. Alternatively, the total laser device L12 can be shiftable on the X axis.
    [0064] The control circuit 13 is connected to a position detector 18 to detect and evaluate data from the rotating workpiece 22, in this case an embossing roller blank. The workpiece is driven by a drive 23, which is symbolized by means of the rotation angle Φ. By the combination of the linear displacement of the engraving unit and the roller rotation a constant SL helical line is created that allows for uniform machining.
    [0065] The application of a deflection unit that can comprise, for example, one or multiple beam splitters as well as electrical-optical or acoustic-optical modulators or one or multiple polygon mirrors allows dividing the initial laser beam into two or in multiple laser beams colliding on two or multiple tracks simultaneously, but at a mutual distance such that they do not interfere. Furthermore, the time interval between the collision of individual pulses can be chosen large enough to avoid thermal overload.
    [0066] By the application of short pulsed lasers whose laser pulses are between 10 femtoseconds and 100 picoseconds, energy is applied in a very short period of time in such a way that a so-called "cold ablation" becomes possible, where the material is evaporated very quickly without unacceptable heating of the adjacent material. The undesirable liquid state of the material which produces crater edges and spatters can thus be almost completely avoided. The desired structures are generated in a computer which controls the laser system in such a way that it is not important whether a surface structure for a male roller or for a female roller is produced. For the rollers, that is, for their surface, for example, a suitable steel, carbide or ceramic material is used.
    [0067] In Figures 10 to 16 some structures among the very large variety of possible surface structures are illustrated. In each of these Figures, the coarse structures GP1 and GM1 are the same as illustrated in Figure 3 while the superimposed fine structures vary. The depicted diamonds 21 of the coarse structures comprise male ridges 22P and female grooves 22M. Exemplary dimensions are a longitudinal diagonal of 4 to 6 mm, more particularly of 4.6 mm, and a transverse diagonal of 1.5 mm to 3 mm, more particularly of 2.0 mm, while the width of the ridges and grooves 22 is equal to approximately 0.2 mm. In the enlarged views, the female frame is shown on the left side of the drawings and the male frame on the right side, and frames are clarified at the bottom.
    [0068] As it appears particularly in the enlarged views, the respective refined structures FP and FM are superimposed on the coarse structures GP1 and GM1, the refined structures varying in their shapes. In Figure 10, the refined FPQ structure consists of squares. The pitch of the squares, that is, their recurrent spacing, reaches about 0.04 mm. As is apparent from Figures 17 to 20, the male and female structures are not exactly inversely matched, but their shapes and dimensions differ from each other by a certain amount.
    [0069] In Figure 11, the refined FPD and FMD structure is shaped like a diamond instead of a square. The dimensions in Figure 11 are slightly larger than those in Figure 10, i.e. the offset from the refined structuring is 0.07mm here, although it is understood that it may be smaller, for example, 0.05mm, or larger.
    [0070] In Figure 12, the refined structure FPRh and FMRh is rhombic. Here the dimensions are also the same as those indicated above.
    [0071] In Figure 13 the refined FPR and FMR structure is round. Here also the pitch of the refined structure can reach 0.07 mm.
    [0072] In Figure 14 only the coarse structure GP1 and GM1 is shown, without any refined structures. A structure like this is particularly suited to producing tactile structures that are not only very noticeable, but also have an aesthetically pleasing appearance. In this way, for example, Braille signs or acoustically usable structures can be produced.
    [0073] In Figure 15 it is shown that no refined structure is not superposed on the male GP1 coarse structure while a FM refined structure (Q, D, Rh, R) is superposed on the GM1 female coarse structure which is square, diamond-shaped , rhombic or round, as shown above, or may include an emblem such as in accordance with Figure 5 or other such decoration.
    [0074] In Figure 16 it is illustrated that a refined FP structure (Q, D, Rh, R) is superimposed on the GP1 male coarse structure while the GM1 female coarse structure has no refined structure.
    [0075] It should be noted that the modalities shown represent only a small fraction of all possible shapes of both coarse and refined structures. Based on this, a very large number of different structures can be produced which can consist, for example, of a few separate logos or logos or something similar to which a refined structure can be superimposed. Furthermore, a microstructure can be superimposed in a known way in order to produce, for example, authentication features or other characteristic features that are generally invisible to the naked eye.
    [0076] Figures 17 to 20B schematically show some possibilities of how the female structure may differ from the male structure. For better representation and visualization, surface structures are shown as being in the shape of teeth and are enlarged to illustrate deviations more clearly.
    [0077] First, in order to be able to indicate the voluntary deviations, the errors, ie the manufacturing tolerances, have to be specified. As mentioned above, one objective of the roll manufacturing improvements among others is to produce more accurate structures suitable for refined embossing, and thus the problem of achieving small manufacturing tolerances arises. These tolerances are also influenced among other things by the surface quality of the rollers and for this reason it is advantageous to use a hard surface. Thus, the rollers can be all carbide rollers or metal rollers provided with a carbide surface, or all ceramic rollers or metal rollers provided with a ceramic surface. All these materials are particularly suitable for fine machining using a laser system. In many cases it is advantageous to provide the surface of the embossing rollers with a suitable protective layer.
    [0078] For example, for the intended machining by means of a laser system, in the case of an embossing roller having a length of 150 mm and a diameter of 70 mm, errors of 2 to 4 μm in the direction of rotation and +/- 2 µm in the axial direction would be desirable and in height, for a tooth height of 0.1 mm, an error of 0.5 to 3 µm. For two opposite tooth flanks forming an angle of, for example, 80°, an angular error of less than 3° is desirable. Thus, for new rollers, a maximum linear error of +/- 5 µm results, so that manufacturing deviations can reach approximately 10 µm.
    [0079] Since these values are strongly influenced by measurements and fabrication, however, only a linear deviation from the male structures to the female structures of 15 μm and more and an angular deviation of 4° and more can qualify as a difference voluntary. The upper limit of the difference of structures is established by the condition that the cooperation of the two rollers cannot be impaired.
    [0080] The voluntary difference between the respective associated structures on the male roller and those on the female roller is strongly dependent on the material being embossed. Thus, for example, the linear difference for embossing a thin blade having a thickness of about 30 µm is approximately 40 µm and for embossing cardstock having a thickness of about 300 µm is approximately 120 µm.
    [0081] In Figures 17 to 20B it is illustrated that it is advantageous for certain structures if the rollers are arranged at a certain constant distance from each other. For a pin up/pin up roller system, a constant spacing like this in the form of a depression in one of the rollers, ie a reduction in diameter at least in the width of the slender blade, per 0.02 to 0.2 mm is described in WO 2011/161002 A1 to the applicant of the present invention.
    [0082] In the cases according to Figures 17 to 20B, the diameter of one of the rollers, advantageously of the male roller, is reduced at least in the width of the thin blade by an amount of more than 0.02 mm in relation to the rest of the roller. In this way a more uniform embossing can be produced. In Figures 17 to 20B this depression or reduced diameter of the male rollers is indicated by an 'S'.
    [0083] Alternatively, instead of a depression, other spacing features can be provided such as, for example, an electronic or mechanical spacing control.
    [0084] According to Figure 17, the female roller M23 has a surface structure SM23 where two opposite flanks of the notches form an angle α23 and the male roller P23 has a structure SP23 where two opposite flanks of the teeth include an angle β23 and β23 is less than α23. These angles can have a value of 10° to 110° and a difference of more than 4°.
    [0085] The female roller M24 in Figure 18 has an SM24 female frame whose N24 grooves have a flat groove bottom. The male P24 roller has an SP24 surface structure whose T24 teeth are rounded.
    [0086] The female roller M25 in Figure 19 has the same SM24 surface structure as shown above while the teeth T25 of the male roller P25 have flat ends.
    [0087] Figure 20 shows an additional modality variant where the female roller M26 has a surface structure SM26 with the rounded grooves N26 while the teeth T26 on the surface structure SP26 of the male roller P26 are also rounded but have a radius smaller than that of slots N26.
    [0088] Figure 20A shows an additional modality variant where the female roller M27 has an SM27 surface structure with a rounded groove N27 while the wedge T27 in the SP27 surface structure of the male roller P27 is also rounded but has a radius smaller than the N27 slot.
    [0089] Figure 20B shows an additional modality variant where the female roller 28 has a SM28 surface structure with the rounded grooves N28 while the teeth T28 on the SP28 surface structure of the male roller P28 are also rounded but have a radius smaller than the N28 slots.
    [0090] The modality variants according to Figures 21 to 35 are also produced according to the principle that the female structures are not exactly inversely corresponding to the male structures. These variants refer to pairs of rollers including zones to create ridges. The ridges can also serve for decorative purposes. Such striations are advantageous in cases where it is difficult to wrap the thin sheet around objects such as tobacco products without interfering with the in-line packaging process.
    [0091] In Figures 21 to 35, the respective devices 80 having a pair of rollers P81 and M81 are illustrated where the male roller P81 is driven by drive 6 and synchronized to the female roller by means of sprockets 39, 40. All rollers in the exemplary embodiments shown they have a basic structure consisting, for example, of triangles TP or TM and a number of ridge zones 82, for example four, which may exhibit different structures also having a decorative effect.
    [0092] Thus, the grooving zones of the pair of rollers P81R1 and M81R1 of Figure 21 have a grid structure R where the grids of the male roller are raised and those of the female roller are lowered. In order to serve as ridges, these structures are generally higher and lowered, respectively, than triangle structures. This applies to all grooved structures shown.
    [0093] Conversely, the grooving zones of the pair of rollers P81R2 and M81R2 of Figure 22 have grating structures recessed on the male roller and grating structures raised on the female roller.
    [0094] The grid structures of the grooving zones of rollers P81R3 and M81R3 of Figure 23 correspond to those of Figure 21 with the difference that the grooving zones do not extend to the edges of the rollers.
    [0095] The grooving zones of pairs of rollers P81LR1-3 and M81LR1-3 of Figures 24 to 26 include radially disposed ridges W protruding from the male or female roller, with corresponding notches in the female or male roller. The P81LR3 and M81LR3 roller pair grooving zones are shorter than the length of the rollers.
    [0096] The grooving zones of P81LL1-3 and M81LL1-3 pairs of rollers of Figures 27 to 29 include longitudinally disposed ridges L protruding from the male or female roller, with corresponding notches in the female or male roller. The P81LL3 and M81LL3 roller pair grooving zones are smaller than the length of the rollers.
    [0097] The grooving zones of P81Z1-3 and M81Z1-3 pairs of rollers of Figures 30 to 32 include the Z teeth protruding from the male or female roller, with corresponding notches in the female or male roller. The P81Z3 and M81Z3 roller pair grooving zones are smaller than the length of the rollers.
    [0098] The grooving zones of pairs of rollers P81K1-3 and M81K1-3 of Figures 33 to 35 include the K teeth having a round cross section and tapering conically towards their tips, and protruding from the male roller or of the female roller, with corresponding notches on the female or male roller. The P81K3 and M81K3 roller pair grooving zones are smaller than the length of the rollers.
    [0099] From the schematically illustrated in Figures 17 to 20B it follows that because of the fact that the structures of the female rollers are not inversely corresponding to the structures of the male rollers, that is, that the dimensions and also the shapes Since the male roller structures and the associated female roller structures are different from each other, reduced crushing of the thin blade between the two rollers results, thereby greatly reducing or totally eliminating any distortion of the thin blade embossed in the transverse direction in several types of embossing.
    [00100] This provides the significant advantage that, despite the high pressures required between the rollers, a perforation of the thin sheet is avoided and its subsequent processing in a packaging line is facilitated. Only then is it possible to use such rollers analogously to known pin-up/pin-up rollers often used in an in-line process on a packaging line. In the case of embossing points or structures arranged on continuous strips, it is advantageous to move the structural elements on the two continuous strips mutually.
    [00101] The male and female rollers of the prior art have always been manufactured in pairs, and because the female rollers are modeled inversely corresponding to the male rollers, each time one of the rollers had to be replaced it was inevitable to replace also the other roller. With the method according to the invention, which allows individual manufacture, it is possible to exchange the male or female roller separately, which is an important advantage not only because of the differences in behavior in use, but also with reference to design possibilities.
    [00102] Quick change devices for the usual pin-up/pin-up rollers are known from US-6 665 998 to the assignee of the present invention and have since been used in most of the embossing devices of cigarette paper all over the world. In these devices, the axis of the opposite roller is movable in all three coordinate directions in order to allow self-synchronization of the embossing rollers.
    [00103] The quick-change device 30 of Figures 36 and 37 comprises a housing 31 having the two seats 32 and 33 intended to receive the respective roller supports 34 and 35. The roller support 34 serves to mount the male roller 36 that is driven by drive 6 not shown, and roller bracket 35 serves to mount female roller 37. According to Figure 36, roller bracket 34 is inserted into seat 32 and roller bracket 35 into seat 33. housing 31 is closed by means of a closure plate 38.
    [00104] In the present example, as in the examples according to Figures 3 to 8, the female roller is driven by the driven male roller 36 via sprockets 39 and 40 located at one end of the rollers. In order to ensure the high precision required for synchronization, the sprockets are very refined. However, other synchronization devices, eg electric motors, can also be used.
    [00105] In the sectional view of Figure 37 it is visible that on the outer drive side, on the left side of the drawing, the roller shaft 41 of the male roller 36 is rotatably supported on a needle bearing 42 on the roller support 34 and on the other side in a ball bearing 43. The two ends 44 and 45 of the roller bracket are retained in the corresponding openings 46 and 47 of the housing and closure plate, respectively. For precise and unambiguous insertion and positioning of the roller holder into the housing, the lower housing part has a T-shaped groove 48 to which a T-shaped key 49 corresponds in the lower part of the roller holder.
    [00106] On one side, on the left side of the drawing, the roller shaft 50 of the female roller 37 is supported on a wall 51 of the roller bracket 35, and on the other side on a second wall 52 of the roller bracket. The edges 53 of the roller holder cover 54 are shaped as keys which are insertable into the corresponding T-shaped groove 55 in the housing 31, and one of the side walls 51 fits into a corresponding opening 56 in the housing wall.
    [00107] The versions shown where the second roller is driven via the sprockets require an adjustment of the rollers after mounting them on the roller supports. This is achieved, for example, by means of sprockets.
    [00108] In the modality variant of the quick-change device 59 of Figure 38, the housing 60 does not have a closure plate, but a wall 61 with a lower semicircular opening 62 and an upper approximately rectangular opening 63. The two rollers and the roller holders are the same as shown above, and the T-shaped groove for receiving the female roller holder and the T-shaped groove 48 in the lower housing are also the same. The rear openings 62 and 63 are similar to the front openings according to the drawing. In this mode, the roller supports are also unambiguously and precisely fixed in the housing.
    [00109] In the embodiment variant of Figure 39, the quick-change device 64 comprises the two identical roller holders 65 and 66, each having the T-shaped key 49, the roller holder 65 being guided and retained in the part. bottom and the other roller holder 66 in the upper part of housing 67. The two roller holders are secured by means of a closure plate 68 having an opening 69 for receiving a roller end.
    [00110] In the exemplary embodiment of Figure 40, the quick-change device 70 comprises a housing 71 having two opposite side walls 72 and 73, in each of which the two openings 74, 75 are arranged to receive the axes 76 , 77 of the two embossing cylinders 36, 37 with sprockets 39 and 40. In this very simplified schematic drawing it is visible that first the roller is inserted into the housing and then the shaft is introduced and fixed. Furthermore, it follows from this example that a quick changeover is also possible without roller supports.
    权利要求:
    Claims (23)
    [0001]
    1. Method for manufacturing an embossing roller assembly for a device for embossing packaging materials having two rollers, the embossing roller assembly comprising a male roller (P11, P11B, P11E, P11L, P11W , P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) having a male surface structure including structural elements and/or logo structures and a female roller (M11, M11B, M11E , M11L, M11W, M2328, 37; M81-R1-3; LR1-3; LL1-3; K1-3) having a female surface structure that is associated with the surface structure of the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) for common embossing operation with the male roller (P11, P11B, P11E, P11L, P11W , P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3), the embossing roller assembly is designed for refined embossing in an in-line process, the characterized method for understanding: producing the male roller (P11, P11B, P11E, P1 1L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) having a male surface structure; produce the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) independently associated with the male roller (P11, P11B, P11E , P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3), the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) having the female surface structure including structural elements and/or logo structures, the steps of producing the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) and the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1 -3; LR1-3; LL1-3; K1-3) include the steps of fabricating contours of male surface structures and female surface structures with a total linear error of less than +/- 10 μm and an angular error of less than 4°, such that the dimensions of the structural elements of the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1- 3) and the dimensions of the associated structural elements of the role female te (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) diverge from each other by a predetermined amount without however impairing their cooperation, and fabricate at least one of voluntary deviations of linear dimensions of the male roller structural elements (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) and the structural elements of the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1- 3; LR1-3; LL1-3; K1-3) are greater than 15 μm, and voluntary deviations of angular dimensions of the angles of the edges of the structural elements of the male roller (P11, P11B, P11E, P11L, P11W, P23-28 , 36, P81-R1-3; LR1-3; LL1-3; K1-3) and the angles of the edges of the structural elements of the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81 -R1-3; LR1-3; LL1-3; K1-3) are greater than 4°.
    [0002]
    2. Method according to claim 1, characterized in that producing the female surface structure comprises shaping the female surface structure in such a way that the embossed packaging material is provided with an embossing pattern noticeable by means of tact.
    [0003]
    3. Method according to claim 2, characterized in that the embossing pattern perceptible by touch includes special signs such as Braille signs or acoustically usable signs.
    [0004]
    4. Method according to claim 1, characterized in that it comprises arranging and designing the logo structures of the male rollers (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3 ; LR1-3; LL1-3; K1-3) and female (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) in such a way that, during the passage of a thin continuous blade between the male rollers (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1- 3) and female (M11, M11B, M11E, M11L, M11W, M2328, 37; M81-R1-3; LR1-3; LL1-3; K1-3), at least two sections can be embossed on the continuous sheet slender in such a way that the embossed logo structures in one section are offset relative to the respective logo structures in the other section in the direction of displacement.
    [0005]
    5. Method according to claim 1, characterized in that it comprises producing raised positioning marks (27) on one of the male rollers (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1- 3; LR1-3; LL1-3; K1-3) and the female rollers (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1 - 3), and produce recessed positioning marks (28) associated with the other among the male roller (P11, P11B, P11E, P11L, P11W, P2328, 36, P81-R1-3; LR1-3; LL1-3; K1 -3) and the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3).
    [0006]
    6. Method according to claim 1, characterized in that the male surface structures and the female surface structures of the embossing rollers are produced by means of a femtosecond or picosecond laser system.
    [0007]
    7. Method according to claim 6, characterized in that it further comprises producing a coarse structure and a refined structure superimposed on a surface of the male rollers (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81 -R1-3; LR1-3; LL1-3; K1-3) and female (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3).
    [0008]
    8. Method according to claim 6, characterized in that it further comprises: producing zones to create striations in the packaging materials by providing one of the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36 , P81-R1-3; LR1-3; LL1-3; K1-3) and the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) with raised rib structures and the other among the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3 ; K1-3) and the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) with associated recessed fluting structures .
    [0009]
    9. Method according to claim 1, characterized in that the packaging material is suitable for packaging food and pharmaceutical products, or is edge paper, cigarette paper, inner lining or inner frame paper, hybrid paper, a synthetic thin sheet, or cardboard or cardstock for packaging tobacco products.
    [0010]
    10. Method according to claim 1, characterized in that producing the male and female structures comprises engraving the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1- 3; LL1-3; K1-3) to form the male surface structure by applying a short pulsed laser with laser pulses between 10 femtoseconds and 100 picoseconds for cold ablation of the male roller surfaces (P11, P11B , P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3), and engrave the female roller (M11, M11B, M11E, M11L, M11W, M23- 28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) to form the female surface structure by applying a short pulsed laser with laser pulses between 10 femtoseconds and 100 picoseconds to cold ablation of female roller surfaces (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3).
    [0011]
    11. Method according to claim 1, characterized in that it produces the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1 -3) having the male surface structure further comprises producing the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) so as to have a diameter that is smaller than a female roller diameter (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3 ) by a predetermined amount, the predetermined amount being greater than 0.02 mm in areas that are not the male surface structure of the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1 -3; LR1-3; LL1-3; K1-3) and the female surface structure of the female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3 ; LL1-3; K1-3).
    [0012]
    12. Method according to claim 1, characterized in that the male surface structure and the female surface structure are one made of at least one of steel, carbide, or ceramic material.
    [0013]
    13. Embossing roller assembly comprising a male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) including elements structural elements and an associated female roller (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) including structural elements, both manufactured with the method as defined in claim 1, characterized in that the structural elements (GP1, GPB, GPE, GPL, GPW, FP-Q, D, Rh, R) of the male roller (P11, P11B, P11E, P11L, P11W, P23 -28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) and the structural elements (GM1, GMB, GME, GML, GMW, FM-Q, D, Rh, R) of the roller female (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) associated are not inversely corresponding and diverge by a defined amount of more than 15 μm linearly and 4° angularly, and contours of the structural elements of the male roller (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3 ) and outlines of female roller structural elements (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) exhibit a total linear error of less than +/- 10 µm and an angular error of less than 4°.
    [0014]
    14. Set of embossing rollers according to claim 13, characterized in that at least the surface of the male rollers (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3 ; LR1-3; LL1-3; K1-3) and female (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) it consists of metal, carbide or ceramic, and the surface is possibly provided with a protective layer.
    [0015]
    15. Set of embossing rollers according to claim 13, characterized in that one of the male rollers (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1- 3; LL1-3; K1-3) and female (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) is connected to the another roller embossing the male (P11, P11B, P11E, P11L, P11W, P23-28, 36, P81-R1-3; LR1-3; LL1-3; K1-3) and female (M11, M11B) rollers , M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1-3; LL1-3; K1-3) by means of synchronization devices.
    [0016]
    16. Set of embossing rollers according to claim 13, characterized in that the male and female rollers (M11, M11B, M11E, M11L, M11W, M23-28, 37; M81-R1-3; LR1 -3; LL1-3; K1-3) are arranged at a mutually determined distance greater than 0.02 mm.
    [0017]
    17. Set of embossing rollers according to claim 13, characterized in that it further comprises a quick-change device (30, 59, 64, 70) to arrange the male and female rollers (36, 37 ) individually and independently interchangeable.
    [0018]
    18. Set of embossing rollers according to claim 17, characterized in that the quick-change device is configured to rotatably retain the male and female rollers (36, 37) in respective roller holders (34, 35 ; 65, 66) secure the roller supports (34, 36; 65, 66) in unambiguous positions, the roller supports (34, 35; 65, 66) being individually and independently removable, in which one end of the support roller bearing (34) is supported on a needle bearing (42) and its other end is supported on a ball bearing (43).
    [0019]
    A set of embossing rollers according to claim 17, characterized in that a lower part of one of the roller holders (34, 65) has a key (49) and a lower part of a housing (31 , 60, 67) has a corresponding slot (48).
    [0020]
    20. Set of embossing rollers according to claim 19, characterized in that an upper part of the other roller holder (66) has a key (49) and in the upper part of the housing (67) a groove (48), or the edges (53) of its upper side form a T-shaped keyway and the upper side of the housing (60) has a T-shaped groove.
    [0021]
    A set of embossing rollers according to claim 18, characterized in that the quick-change device (70) comprises a housing (71) with two opposite walls (72, 73), each having two openings. (74, 75) with clamping devices to receive and secure the shafts (76, 77) of the male and female rollers (36, 37).
    [0022]
    22. Set of embossing rollers according to claim 13, characterized in that one of the male and female rollers is connected to the other of the male and female rollers by means of sprockets (39, 40).
    [0023]
    A set of embossing rollers according to claim 13, characterized in that the male surface structure and the female surface structure are one made of at least one of steel, carbide, or ceramic material.
    类似技术:
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    同族专利:
    公开号 | 公开日
    US20150059599A1|2015-03-05|
    MX348059B|2017-05-25|
    IN2014DN09197A|2015-07-10|
    EP2838721B1|2021-09-01|
    RU2620044C2|2017-05-22|
    US9579924B2|2017-02-28|
    MX2014012092A|2015-08-14|
    ES2893098T3|2022-02-08|
    CN104245299A|2014-12-24|
    DE202013012131U1|2015-06-26|
    WO2013156256A1|2013-10-24|
    RU2014142362A|2016-06-10|
    CN104245299B|2018-06-29|
    SG11201405930WA|2014-11-27|
    PL2838721T3|2021-12-27|
    EP2838721A1|2015-02-25|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-03| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-04-27| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-22| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 22/03/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP12164380.3A|EP2653301A1|2012-04-17|2012-04-17|Method for manufacturing a set of embossing rollers|
    EP12164380.3|2012-04-17|
    EP12183455.0|2012-09-07|
    EP12183455.0A|EP2705948A1|2012-09-07|2012-09-07|Method for manufacturing a set of embossing rollers|
    PCT/EP2013/056144|WO2013156256A1|2012-04-17|2013-03-22|Method for manufacturing a set of embossing rollers|
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