EP2842730A1 - Device for embossing packaging materials with a set of embossing rollers of the male matrix type - Google Patents

Abstract

The embossing device for embossing packaging material comprises a set of embossing rollers with cooperating male and female rollers whose surface is provided with structural elements, the structural elements (M6R6) on the surface of the master cylinder (M6), the structural elements (P6E6) on the surface the Patrizenwalze (P6) are associated, are not inversely congruent to an amount of above 15 microns in the axial and radial directions and the associated structural elements of the male and female rollers for the purpose of local pressure increase facets (F). A facet (F) has surfaces (FN) inclined with respect to the imaginary, continuous surface of the structure. With such faceted rollers, a very large variety of films can be aesthetically pleasing, whereby the films can be used above all in the tobacco and food industry.

Description

The present invention relates to a device for embossing packaging material with at least two embossing rollers, according to the preamble of patent claim 1.

Packaging films for the tobacco industry or for the food industry have been embossed for quite some time with embossing roll devices, wherein z. For example, so-called inner liners, which are wrapped around a number of cigarettes, or can act as packaging material for chocolate, butter or similar foods, electronic components, jewelry or watches.

The so-called inner liners initially consisted of pure aluminum foils, such as household foils, and these were characterized by the fact that they were carried out between two rolls, of which at least one roller had a relief, the so-called logos. Until about 1980, such a pair of rollers consisted in the majority of a steel roller on which a relief was formed and a counter-roller of a resilient material, such as rubber, paper or Plexiglas. By impressing the relief of the Patrizenwalze in the mating roll = die roll of the mirror image impression was prepared.

Representative of it is the EP 0 114 169 A1 called, which discloses a male with projections and a die with associated recesses, wherein the wells are slightly larger and can also have steps and are prepared by a laser. As the material of the counter roll hard rubber is listed, while the term "hard" although mentioned in the document, but not explained. In addition, this device is provided only in one To be operated gravure printing machine, that is without pressure or only with the pressure of this machine.

For more sophisticated logos, the relief of the patrix roll was transferred to a layer on the die roll and the pits corresponding to the raised areas were etched out or otherwise worked out. Recently, lasers have been used for this engraving.

Since this production of die rollers for sophisticated logos is expensive, sat down from about 1980, after the registration of the US 5,007,271 by the same Applicant, a so-called pin up-pin-up system, wherein two identical steel rollers with a very large number of small teeth mesh and emboss a running in-between innerliner. Logos are made with this device by wholly or partially removing teeth on a roller.

As a result, it has also been possible to produce the so-called satin, whereby the previously shiny surface receives a dull and thus also more noble appearance due to the large number of small depressions which have been caused by the teeth.

Parallel to the development of embossing technology, or the production of embossing rollers, also a change in the packaging materials took place, the original all-metal aluminum foils were replaced by paper foils, whose surfaces were coated from environmental considerations with ever thinner metal layers, with the last sputtered the metal layer , In more recent times, and also in the future, the metallization of inner liners will become even smaller or disappear altogether.

At the same time efforts are underway, packaged by the traditional packaging system cigarettes in inner liners and put this pack in a cardboard housing to get away, so-called soft packs, with only a wrapping film is provided, both functions, namely the moisturization of cigarettes and protection against external odors on the one hand and a certain stiffness for the mechanical protection of the cigarettes on the other.

The developments in the production of embossing rollers, in particular by the same applicant known, see, for example US Pat. No. 7,036,347 , have led to an ever-increasing amount of decorative effects on the innerliners and to a greater technical offer for promotional purposes, which has been used not only in the cigarette industry but also in the food industry. Recently, however, efforts are underway to reduce the advertising of tobacco products greatly or eliminate altogether, so that an imprint of the innerliner with promotional designs will not be possible to the extent possible. There are therefore increasingly sought ways to create new decorative effects without the use of conspicuous imprints, gold edges or the like ornaments.

It is also looking for new ways for product identification, which has been ensured until now, especially in globally cultivated brand names. Today come z. As so-called tactile effects are used, which are generated by special surface structures of the papers or special engravings. Textiles such as papers are provided with inflatable colors optimized for IR absorption which produce so-called pseudo-embossings. Sense of this technique can be a noticeable relief formation, for example, to create a velvety surface or a matte effect. When used for food-safe purposes, however, wetting techniques are questionable.

In tactile surfaces, the consumer identifies the product by his sense of touch. It may also result in braille usage or hidden security features. Tactile generated information can be read, for example, by means of laser beams through the surface-dependent reflectivity. There are also developments today that aim to create acoustically audible effects by painting the surface.

Another area of the tobacco industry deals with the cigarette itself, for example, with the mouthpiece, also called tipping.

The increasingly restrictive legislation on smokers, as well as the desire to further features such as tactile, acoustic or other optical features on the one hand and the ever-increasing variety of packaging materials such as aluminum foil, metal-coated papers, Tippingpapiere, hybrid films, plastic films, cardboard or half board on the other cause Although conventional pin-up pin-up embossing rollers, in which both the driven roller and the counter-rollers have a large number of teeth, are still fully and successfully applicable to embossing inner liners, they reach their limits for the purposes set out above bump.

Although known roller systems with a patrone roller with Patrizenstrukturen and a die roller with inversely congruent die structures can expand the range of decorative elements, but are due to the Pairwise manufacturing and sorting in production very costly and, above all, time-consuming, so that their production for industrial embossing of, for example, metallized inner liners for the tobacco industry is not suitable.

In addition, a fine embossing can be ensured only with a very large effort in the production of such rolls. In addition, in this case, when using a patrone roller and an inversely congruent die roller, the intervening film is squeezed during embossing so as to generate tensions in the transverse direction which are unacceptable to tobacco product papers. In addition, there is a hard-to-control limit for hole formation and very high pressures are required for a high-speed on-line method, with the stamping times in the millisecond range. Finally, there is a tendency to use thicker papers.

In the non-prepublished patent application PCT / EP2013 / 056144 To solve the general problem, to provide a method for producing a set of embossing rollers with which it is possible to carry out embossing for a variety of described surface structures of the specified materials of various kinds in the online operation of a packaging plant, proposed that in a Pater-Mater Embossing roll system, the template surface structure is produced independently of a previously generated or physically existing male surface structure.

For fine structures this statement is sufficient, because this production method allows a very wide variety of design options.

However, when dealing with relatively larger free formed surfaces of logos, their embossing with satisfactory aesthetic quality is problematic. In order for these surfaces to have the same reflectivity everywhere, for example with innerliners, the same minimum specific embossing pressure has to be applied everywhere. However, this is not possible without suitable measures if the smallest local deviations of the geometry between male and female rolls exist, which greatly vary the local embossing pressure. With too tight tolerances and high pressures, the embossing creates holes. High pressures can interfere with the sandwich structure of an innerliner, which at elevated temperatures leads to its degradation by creating a stain on the reverse side of the paper.

The practical, without much effort maximum applicable pressure is today z. At 3,000 N / per area of 150mm by 1mm; Roll length times embossed width on a roll of about 70mm diameter. In addition, the paper thickness, which naturally varies locally with cellulose, can not be compensated.

If there are many free formed patterns on the same roll surface, the paper can easily crumple because of locally different paper stretch. The currently required high sampling density increases this problem.

It is from this prior art object of the present invention to provide an embossing device with an embossing roller set with at least two cooperating Patrizen- and die rollers, which not only allows fine embossing for a variety of described surface structures of the specified Materials of various kinds in the online operation of a packaging plant perform but also the high-quality, eye-catching fine embossing of sophisticated logos, such. B. mythical creatures, letters and the like. This task involves the creation of graded degrees of brilliance and graded contours. Such a device is defined in independent claim 1.

In general, fine embossing is understood to mean that the contours of the fine embossing structures of the rolls have a total linear error in the axial and radial directions of less than +/- 10 μm and / or an angle error of less than 5 °.

Fig. 1

zeigt schematisch eine Vorrichtung mit einem Satz Prägewalzen mit einer Patrize und einer Matrize, die je mit einer einfachen Struktur versehen sind,

Fig. 1A

zeigt schematische eine facettierte Rundung,

Fig. 2, 2A

zeigen schematisch ein Zeichen mit Facetten,

Fig. 2B-2E

veranschaulichen schematisch vier Regeln für Facetten,

Fig. 3-5

zeigen schematisch Schnittzeichnungen von Ausbildungen von nicht invers kongruenten Patrizen- und Matrizenstrukturen,

Fig. 6

zeigt eine zweite Vorrichtung mit einem Satz Prägewalzen mit einer Patrize und einer Matrize, auf der die Struktur aus einer anspruchsvollen Figur besteht,

Fig. 7

zeigt eine weitere Vorrichtung mit einem Satz Prägewalzen, die mit einer anspruchsvolleren Figur versehen sind,

Fig. 8

zeigt eine Ausschnittsvergrösserung aus Fig. 4,

Fig. 9

zeigt eine Struktur auf einer Patrizenwalze,

Fig. 10

zeigt eine weitere Struktur auf einer Patrizenwalze,

Fig. 11

zeigt ein weiteres Ausführungsbeispiel eines Prägesatzes,

Fig. 12

zeigt ein Ausführungsbeispiel eines Prägesatzes mit einer Patrizenwalze und zwei zugeordneteten Matrizenwalzen,

Fig. 13

zeigt einen weiteren Prägewalzensatz mit einer Matrizenwalze und zwei zugeordneten Patrizenwalzen,

Fig. 13A

zeigt die Verwendung einer Matrizenwalze mit einer Patrizenwalze.

Fig. 13B

zeigt die Verwendung derselben Matrizenwalze mit einer anderen Patrizenwalze,

Fig. 14

zeigt eine Prägevorrichtung mit einer Matrizenwalze und zwei Patrizenwalzen,

Fig. 15A, B

zeigen zwei schematisierte Schnitte der Walzen von Fig. 14,

Fig. 16

zeigt eine weitere Prägevorrichtung mit einer Matrizenwalze und zwei Patrizenwalzen,

Fig. 17

zeigt eine weitere Prägevorrichtung mit einer Matrizenwalze und zwei Patrizenwalzen,

Fig. 18

zeigt schematisch ein erstes Ausführungsbeispiel einer Schnellwechsel-Einrichtung für Walzen gemäss Erfindung in perspektivischer Sicht,

Fig. 19

zeigt die zusammengebaute Einrichtung von Fig. 18 in einem Schnitt,

Fig. 20

zeigt schematisch ein zweites Ausführungsbeispiel einer Schnellwechsel-Einrichtung für Walzen gemäss Erfindung in perspektivischer Sicht.

Other objects and advantages will become apparent from the dependent claims and the description below. The invention will be explained in more detail below with reference to drawings of exemplary embodiments.

Fig. 1

shows schematically a device with a set of embossing rolls with a male and a female die, each provided with a simple structure,

Fig. 1A

schematically shows a faceted rounding,

Fig. 2, 2A

show schematically a character with facets,

Fig. 2B-2E

illustrate schematically four rules for facets,

Fig. 3-5

show schematically sectional drawings of embodiments of non-inversely congruent male and female structures,

Fig. 6

shows a second device with a set of embossing rollers with a male part and a die on which the structure consists of a sophisticated figure,

Fig. 7

shows another device with a set of embossing rollers, which are provided with a more sophisticated figure,

Fig. 8

shows a detail enlargement Fig. 4 .

Fig. 9

shows a structure on a Patrizenwalze,

Fig. 10

shows another structure on a patrix roller,

Fig. 11

shows a further embodiment of an embossing sentence,

Fig. 12

shows an embodiment of an embossing set with a Patrizenwalze and two associated die rollers,

Fig. 13

shows another embossing roller set with a die roller and two associated Patrizenwalzen,

Fig. 13A

shows the use of a stencil roller with a patrone roller.

Fig. 13B

shows the use of the same master roll with another male roll,

Fig. 14

shows an embossing device with a die roller and two Patrizenwalzen,

Fig. 15A, B

show two schematic sections of the rolls of Fig. 14 .

Fig. 16

shows a further embossing device with a die roller and two Patrizenwalzen,

Fig. 17

shows a further embossing device with a die roller and two Patrizenwalzen,

Fig. 18

shows schematically a first embodiment of a quick-change device for rolls according to the invention in a perspective view,

Fig. 19

shows the assembled device of Fig. 18 in a cut,

Fig. 20

schematically shows a second embodiment of a quick-change device for rollers according to the invention in a perspective view.

Fig. 1 shows schematically and simplified a structure of an embossing device 1 with a Patrizenwalzenwalze P1 and a die roller M1, wherein the Patrizenwalze is driven by a drive 2. The patrone roller P1 has two elevations P1E1 and P1E2 which are different from one another, and the matrix roller M1 has depressions M1R1 and M1R2 associated with the elevations of the patrone roller. Since the structures of the die rollers are made independent of the structures of the patrone rollers, the associated die recesses are not exactly inversely congruent with the Patrizenerhebungen. As will be further explained, the deviations may include both height or depth dimensions and angles.

While the elevation P1E1 and the associated depression M1R1 are hemispherical, the elevation P1E2 and the associated depression M1R2 are structured, in this case having so-called facets F. According to the Brockhaus, facets are ground surfaces and, analogously, facets are defined here as flat partial surfaces attached to a surface. The partial surfaces of a surface do not have to have the same dimensions among one another.

The following physical considerations can be made regarding the mode of operation and the advantages of the facets. The resolution of the naked eye is under ideal conditions about 0.5 'to 1', corresponding to 1 mm to 3-6 m or 0.1 mm to an eye relief of 30 cm to 60 cm. The resolution is determined similar to optical instruments by the size of the pupil. The distance of the visual cells in the retina pit, the place of sharpest vision, is adapted to the resolution capacity of the eye, this distance amounts to approximately 0.3 '. At average ratios, two points are separately discernible if their angular separation is 2 '. With weak objects and towards the edge of the visual field the visual acuity decreases noticeably. On the other hand, the recognizability of fine structures is higher. It can, for example, reach 0.3 'in lines with good contrast, which is achieved by innate image processing in the brain.

1. A) Wie aus der Malerei bekannt, können komplizierte Formen vom Menschen erkannt werden, wenn die Konturen und/oder Flächen eines Objekts nur andeutungsweise sichtbar sind.
2. B) Solange die Krümmungswinkel eines Objekts konstant oder nahezu konstant sind werden selbst grössere Flächenstücke anhand weniger heller Punkte erkannt beziehungsweise im Gehirn konstruiert. Voraussetzung dazu ist, dass die Intensität des reflektierten Lichtes genügend Kontrast liefert.

Based on the innerliner, an in situ reflectivity of 20-30% must be assumed, ie a piece of foil irradiated with white light over a large area a maximum of 20-30% of the incident light intensity is reflected. Because of the only slightly metalized surface, the human eye therefore requires a minimum area of about 0.4 mm × 0.4 mm, or 0.16 mm ² , in order to be able to distinguish small areas in terms of contrast. The image processing of the brain is thus responsible for two other effects:

1. A) As known from painting, complicated shapes can be recognized by humans if the contours and / or surfaces of an object are only hinted at.
2. B) As long as the angles of curvature of an object are constant or nearly constant, even larger pieces of surface are detected by means of less bright points or constructed in the brain. The prerequisite for this is that the intensity of the reflected light provides sufficient contrast.

As already indicated, the contrast, or the good recognizability of free surfaces with partly excessive flat surfaces of any shape, here called facets or polygons, can be improved on the patrone roller or recessed on the die roller. The facets mark the individual surface parts and are designed by size and arrangement so that thanks to the higher specific embossing pressure higher brilliance and thus good aesthetic impression of the overall impression is created. This impression is generated by the image processing of the human eye on the basis of refractive edges, which cause a locally increased embossing pressure.

How out Fig. 1A Obviously, the facets F1-F4 are distributed on the relief surface 15 and are always flat approximations or parts of the actual relief. The height of the facet is z. B. between 0.02 and 0.4 mm. The result is a technique that reduces the entire print area and provides good aesthetic results even with limited maximum print.

Based on Fig. 2 is schematically and simplified the term "facet" explained in more detail. Fig. 2 shows a relatively large object, an "L" having a first leg length L1 of 10 mm and a second leg length L2 of 12 mm, a leg width B of 2.2 mm and a height H of 0.3 mm.

If, according to the known state of the art, only the inner "L", i. According to the inner, everywhere perpendicular sides, mounted on the rollers, the film would most likely tear at this embossing depth, or be blurred or irregularly perceptible at very reduced pressure.

In order to protect both the film as well as to increase the contrast, all sides of the letter are provided with inclined surfaces, in which case only the inclined surfaces L1S, B1S, S1S and L2S are numbered. The inclined surface S1S denotes a arranged between a longitudinal and a broad surface Spickel. The angle δ between the vertical sides and the inclined surfaces is determined essentially according to the size of the object and the nature of the film. This angle does not have to be the same everywhere.

In the present case described so far, the facets produced on the film consist of the inclined surfaces. However, if the facet angle δ below described criteria are not sufficient, or the contrast is unsatisfactory, are mounted on the surface LO facets FR, see Fig. 2A , The facets FR according to Fig. 2A have in this embodiment, a width BB of 0.5 mm at the base and depending on the angle γ a width BT top of 0.3 mm, wherein the height HF is 0.1 mm. This facet spans the entire width of the letter. Embossing creates raised facets in the film with a complete angle ε.

Starting from the example described, many variations are conceivable. So z. B. the angle γ, or e, or the height HF each vary, provided that the criteria given below are met.

1. 1. Um Änderungen des Reliefs mit einer unterschiedlichen Neigung α von unter 55° zu wahrzunehmen, muss man die Facettenoberflächen, die eine Neigung von β = 70-90° aufweisen, um mindestens 0.04 mm Höhe trennen, siehe Fig. 2B.
2. 2. Die Oberflächen eines Reliefs mit Facetten mit einer unterschiedlichen Neigung von mehr als 55° sind unterscheidbar, falls sie nicht eine Länge oder Breite d
   überschreiten, wobei d beispielsweise 0,7 mm betragen kann, siehe Fig. 2C.
3. 3. Facettenoberflächen mit mehr als 0.7 mm Ausdehnung können sich von einer anderen Facettenoberfläche mit einem Neigungswinkel zwischen 70 und 90° und einer Schrägflächenlänge lm von mindestens 0.5 mm abgrenzen. Falls diese Regel beobachtet wird, kann sich die Länge l der Oberfläche bis 30 mm erstrecken und unterscheidbar sein, siehe Fig. 2D.
4. 4. Bei einer Folge von Facettenoberflächen mit Neigungen von je 90° sollte die Höhe h, hl der Facetten für jede Oberfläche mind. 0,04 mm betragen, damit sie klar erkennbar sind, siehe Fig. 2E.

It is theoretically possible to attach the facets in any way, regardless of their size and shape. However, experiments have shown that certain criteria achieve an optimal reflectivity and thus view of an object when the following points of view are observed. The angles of inclination, whether the surface or the side surfaces of the facet, are always related to the imaginary, continuous surface of the logo. Under Logo are understood all figures or characters.

1. 1. In order to perceive changes of the relief with a different inclination α of less than 55 °, it is necessary to separate the facet surfaces, which have an inclination of β = 70-90 °, by at least 0.04 mm height Fig. 2B ,
2. 2. The surfaces of a relief with facets with a different inclination of more than 55 ° are distinguishable, unless they have a length or width d
   exceed, where d may be, for example, 0.7 mm, see Fig. 2C ,
3. 3. Facet surfaces more than 0.7 mm in dimension may be delimited by another facet surface with an inclination angle between 70 and 90 ° and a bevel length lm of at least 0.5 mm. If this rule is observed, the length l of the surface may extend up to 30 mm and be distinguishable, see Fig. 2D ,
4. 4. For a sequence of facet surfaces with slopes of 90 ° each, the height h, hl of the facets should be at least 0.04 mm for each surface to be clearly visible, see Fig. 2E ,

It can be seen from the above information that a facet is understood as meaning a generally planar partial surface which has facet surfaces which are inclined at a specific angle with respect to the imaginary and continuous surface of the logo.

The values and conditions given are examples of information that can be used to achieve good results. However, it is conceivable that other values can produce good or satisfactory results.

Since these structures are not teeth, the driving force is transmitted from the driven via the belt drive 2 Patrizenwalze on the die roller via gears 3 and 4.

In the Fig. 3-5 There are shown schematically some possibilities how the matrix structure can deviate from the patrix structure. For better representation and visualization, the surface structures are tooth-shaped and enlarged in order to make the deviations more visible.

In order to be able to specify the desired deviations, the systematic errors, i. the manufacturing tolerances are defined. As mentioned above, among other things, the improvements in roll manufacturing are aimed at producing more accurate and suitable fine-embossing structures, and thus the problem arises of achieving close manufacturing tolerances. Among other things, these tolerances are also influenced by the quality of the surface of the rolls and it is therefore advantageous to use a hard surface.

These may be solid carbide rolls or metal rolls with a surface made of cemented carbide, hardened steel or hard material such as ta-C, tungsten carbide (WC), boron carbide (B ₄ C) or silicon carbide (SiC), all-ceramic rolls or metal rolls with a ceramic surface. These are all materials that are particularly suitable for fine machining, for example by means of a laser system. In most cases, it is advantageous to provide the surface of the embossing rollers with a suitable protective layer. Both embossing rollers have rigid-surface-hardened roller bodies against deformation, so that the surface geometry is maintained even under high loads.

For example, for an embossing roller having a length of 150 mm and a diameter of 70 mm and the intended fine machining in the direction of rotation an error of 2-4 microns and in the axial direction of such a +/- 2 microns sought and in height, at a tooth height of 0.1 mm, such from 0.5 to 3 microns. At an angle of two opposite tooth flanks of eg 80 ° becomes a Angular error of less than 3 ° sought. This results in a maximum linear error of +/- 5 μm for new rolls, so that the production-related deviations can be up to 10 μm.

However, since these values are strongly influenced by the measurements and the production, it is only possible to speak of a desired difference starting from a linear deviation of the male structures from the female structures of 15 μm and more in the axial and radial direction as well as from an angle deviation of up to 20 ° for the total angle become. The upper limit of the difference of the structures is set by the condition that the two rolls can work together unimpaired.

The desired difference of the respectively assigned structures on the male and on the die depends strongly on the material to be embossed. Thus, for example, the linear difference of the distance for the embossing of a film about 30 μm thick is around 40 μm and when embossing a semi-cardboard about 300 μm thick about 120 μm.

In the Figures 3 - 5 It is shown that it is advantageous for certain structures when the rolls are at a certain constant distance from each other. For a Pin Up - Pin Up roller system, such a constant distance is in the form of a reduction of a roll, or smaller diameter, at least across the width of the film, by 0.02 to 0.2 mm, in the WO 2011/161002 A1 described by the same applicant.

In cases according to Figures 3 - 5 For example, the diameter of one of the rollers, advantageously the patrone roller, is at least the width of the film by an amount more than 0.02 mm lower than the rest of the roller. Thereby a more uniform embossing can be generated. In the Figures 3 - 5 is such a reduction, or the difference of the diameter of the Patrizenwalze designated by an 'S'.

Instead of lowering also other spacer means may be provided, for. B. an electronic or mechanical distance control.

In Fig. 3 the die roller M2 has a surface structure SM2, wherein two opposite flanks of the recesses have an angle α2. The Patrizenwalze P2 has a structure SP2, wherein two opposite edges of the teeth enclose an angle β2 and β2 is smaller than α2. The angles can have an amount of 10 ° to 110 ° and a difference of up to 20 °.

The die roll M3 in Fig. 4 has a matrix structure SM3 whose grooves N3 have a flat groove surface. The male part P3 has a surface structure SP3 whose teeth T3 are rounded.

The stencil roller M4 off Fig. 5 has the same surface texture SM4 as before, while the teeth T4 of the patrone roller P4 are flattened at the tip.

The same considerations apply to rounded structures and facet structures.

Fig. 6 shows a further embossing device 6, which has a Patrizenwalze P5 and a die roller M5. The two rollers each have an associated structure P5E5 and M5R5 in the form of a wolf's head. The remaining elements are the same as according to Fig. 1 ,

In the FIGS. 7 and 8 An embossing device 7 is shown with a patrone roller P6 and a die roller M6, wherein the figures P6E6 and M6R6 are shown in the form of a deer. From the highlighted representation of Fig. 7 It can be better seen that the figures are recessed on the die roll M6 and raised on the punch roll P6.

Fig. 8 represents a cut-out enlargement from the punch roller P6 of FIG. 7 from which it can be seen that the deer is faceted, that is to say that the surface is resolved into partial surfaces, in facets FN. This measure substantially increases the brilliance, or the reflectivity of the object on the slide. If the deer were to consist of a surface, it might be conceivable that the image visible to the eye appears irregular and possibly blurred. Dividing the surface into faceted partial surfaces FN increases the contrast of the image and results in a visually pleasing image.

In the FIGS. 9 and 10 Two lions and a crown are shown, which are here raised Patrizenstrukturen. On the right side, the lion P7E7 is shown in full, with the facets are relatively difficult to see, while on the left side, the Lion P7EF7, the facets are clearly visible as in a wire mesh. In Fig. 10 Both lions are fully represented. The mutually associated structures on the mating roll are each not worked out in a congruent inverse relationship to one another.

In Fig. 11 Another set of embossing rollers is shown, in the drawing left, or in the enlargement below, the Patrizenwalze P8 and accordingly right, or at the top of the magnification, the die roller M8 are shown. In particular, from the enlarged view, it can be seen that the depth and width of the lines of the lily are less than the depth and width of the word "dream". This symbolizes that the structures, ie the signs and drawings and figures, can have very different heights or depths. The height of the raised reliefs need not be the same as the depth of the depressions on the die roller.

It has also been shown that this word is strongly emphasized by the broadening and increasing, or deepening of the word "Dream", more than with greater thickness, but the same height or depth of the lily. The broadening and simultaneous increase and decrease of a character compared to a character with smaller width and height, or depth causes an increased emphasis on this character.

In the Fig. 12 to 17 schematically shows that not only embossing devices with two embossing rollers but for a number of applications can conveniently be embossing devices with a set of embossing rollers with three embossing rollers advantageous. In this case, two die rolls or a die roll two Patrizenwalzen assigned to a Patrizenwalze. Theoretically, it is also conceivable to use a set of embossing rollers with more than three embossing rollers.

In Fig. 12 The punch roller P9 has two superimposed rectangles P8E1 and E2, and the pinch rollers M9A and M9B have respective recesses M9AR1 and R2, M9BR1 and R2, the recesses M9AR1 and R2 having a smaller depth than the recesses M9BR1 and R2. As in Fig. 12 indicated, the three rollers work together in a three-roller system, wherein the elevations P8E1, E2 are arranged on the Patrizenwalze such that in each case a pair of surveys with the associated recesses on the first and the second survey pair cooperate with the associated recesses of the second stencil roll, wherein the recesses M9AR1, R2 are less deep than the recesses M9BR1, R2.

However, it is conceivable that in each case the male part in a two-roller system first with one and then with the other stencil roller cooperates, wherein each of the male roller P9 cooperates first with the stencil roller M9A and then the same Patrizenwalze P9 with the other stencil roller M9B.

This allows embossing of raised or deep figures without overstretching the film. In particular, a tearing of the film at the points of the deeper die recesses can be avoided.

Another example of a stamping machine with three embossing rollers is in Figures 13, 13A and 13B While the recessed figure M10R10 of the master roll M10 remains the same, the male roll P10A has a relief P10AE10 having a lower height than the relief P10BE10 of the male roll P10B.

Fig. 14 shows another arrangement with a stencil roll M11 and two Patrizenwalzen 11A and 11B. The stencil roll M11 has a faceted depression M11R11, which is assigned to each of the elevations P11AEA and P11BEB, the two elevations being different from one another. Not to the slides To stress such that holes are formed, is first embossed with the Patrizenwalze P11A, whose elevation is less than that of the second Patrizenwalze P11B, in this case sharp-edged facets.

Fig. 15A schematically shows a section through the recess M11R11 of the stencil roll M11 and the elevation PM11AEA the first Patrizenwalze P11A in Fig. 14 ,

Fig. 15B schematically shows a section through the recess M11R11 of the stencil roll M11 and the collection PM11BEB the second Patrizenwalze P11B in Fig. 14 ,

It can be seen from the two sectional figures that the film running between the embossing rolls is first embossed and then embossed deeper.

Such a multi-roll device with a M (P) atrizenwalze and several P (M) atrizenwalzen as mating rolls whose associated elevations (depressions) of mating roll to mating roll are each larger, is used for embossing of so-called inflated structures. These are arranged one above the other and can be embossed without tearing the film, which would lead to the tearing of the film in a single embossing with the same structures.

Fig. 16 shows another arrangement with a die roll M12 and two Patrizenwalzen 12A and 12B. The master cylinder M12 has a faceted recess M12R12 associated with each of the bosses P12AEA and P12BEB of the male rollers P12A and B, the two bosses having different heights from each other. By stamping with the P12A punching roller and then with the P12B punching roller, the foil is stamped on the higher, textured Reliefs P12BE12 not so strained that holes are created.

Fig. 17 shows another arrangement with a stencil roller M13 and two Patrizenwalzen P13A and P13B. The matrix roller M13 has a faceted depression M13R13, which is assigned to each of the elevation P13AEA and P13BE13 of the patrone rollers P13A and B, wherein the elevation P13AEA has a lower height than the elevation P13BE13. As a result, the film is not so strained during embossing that holes are formed.

The use of multiple rolls with different depths and depressions allows the embossing of greatly inflated reliefs, without overstressing the film so that it is perforated.

From the above examples, it can be seen that the provision of logos of any shape with facets is not limited to a particular size of the area, as long as a minimum area of 0.4 mm X 0.4 mm, corresponding to 0.16 mm ² and applied everywhere can be where a Konstrastverbesserung is desired.

The prior art male-female rolls were always made in pairs, and because the female rolls were formed in inverse congruence with the male rolls, it was imperative that each time one of the rolls be replaced, the other roll also be replaced. The individual production of the embossing rollers according to the present invention, it is now possible to replace both the male and the female cylinder individually, which brings a great advantage not only in terms of different wear behavior but also in terms of design options. Quick-change devices for the usual pin-up pin-up rollers are made of U.S. 6,665,998 by the same applicant and since then for the majority of all cigarette paper stamping machines in use worldwide. The axis of the counter roll is there in the three coordinate directions movable to allow self-synchronization of the embossing rollers. This is no longer necessary with the rolls of the present invention which no longer have any teeth.

The quick-change device 30 of Figures 18 and 19 A roller bearing 34 serves to fasten the driven by the drive 2, not shown, the roller 36 and roll carrier 35 serves to fasten the die roller 37. According to Fig. 20 the roller carrier 34 is inserted in the receptacle 32 and roller carrier 35 in the receptacle 33. The housing 31 is closed with a cover plate 38.

In the present example, the die roller is driven by the driven patrone roller 36 respectively via gears 3 and 4 located at one end of the rollers. In order to ensure the required high precision of the synchronization, the gears are very finely executed. Other synchronization means are possible, e.g. Electric motors.

From the cut of Fig. 19 It can be seen that on the external drive side, left in the drawing, the roll axis 41 of the male roll 36 is rotatably supported in a needle bearing 42 in the roll carrier 34 and on the other side in a ball bearing 43. The two ends 44 and 45 of the roller carrier are in corresponding openings 46 and 47 held in the housing, or end plate. For the exact and unambiguous introduction and positioning of the roller carrier in the housing, the housing bottom has a T-shaped groove 48, which corresponds to the roller carrier base a T-shaped spring 49.

The roll axis 50 of the die roll 37 is mounted on one side, in the drawing on the left, in a wall 51 of the roll carrier 35 and on the other side in a second wall 52 of the roll carrier. The edges 53 of the cover 54 of the roller carrier are formed as springs, which can be pushed into the corresponding T-slot 55 in the housing 31. In this case, one side wall 51 fits into a corresponding opening 56 in the housing wall. The lid 57 projecting part of the side wall 52 fits into a recess 58 in the housing wall.

In the versions shown, in which the second roller is driven by gears, an adjustment of the rollers after mounting in the roll carrier is required. This happens, for example, with the help of the gears.

In the embodiment of the quick-change device 59 of FIG. 20 For example, the housing 60 does not have a closure plate but a wall 61 having a lower half-round aperture 62 and an upper approximately rectangular aperture 63. The two rollers and the roll supports are the same as before and the T-shaped groove for receiving the die roll carrier and the T-shaped Groove 48 in the housing bottom are also the same. The rear openings are similar to the front openings 62 and 63 in the drawing. Also in this embodiment, the roller carriers are uniquely and accurately fixed in the housing.

The use of three-roll embossing devices have been available at least since the year 2000 WO 00/69622 of the same applicant.

Claims (14)

Embossing device for embossing packaging material with a set of embossing rollers with cooperating male and female rollers, the surface of which is provided with structural elements, wherein the structural elements (MR) on the surface of the die roller (s) (M), the Strukturelelementen (PE) on the Surface of the male roller (s) (P) are assigned to an amount of above 15 microns in the axial and radial directions are not inversely congruent and the associated structural elements of the male and female roller (s) for the purpose of local pressure increase facets (F). Embossing device according to claim 1, characterized in that a facet (F) has surfaces (FN, FR, F1-F4) inclined with respect to the imaginary, continuous surface of the structure. Embossing device according to claim 1 or 2, characterized in that the minimum surface of a facet is 0.4 mm x 0.4 mm, or 0.16 mm ² . Embossing device according to any one of Claims 1 to 3, characterized in that it comprises a punching roller (P9) and two die rollers (M9A, M9B), the device comprising means for engaging the male roller (P9) with the patrix elevation (P9E1, E2) first with the first die roll (M9A) with the associated die recess (M9AR1,2) then with the second die roll (M9B) with the associated die recess (M9BR1,2) cooperates. Embossing device according to one of claims 1 to 3, characterized in that it comprises a die roll (M10-13) and two patroller rolls (P10A-13, P10B-13), wherein
the apparatus includes means for having the die roll (M10-13) with the recess (M10-13R10-13) first with the first punching roll (P10A-13) with the associated patrix elevation (P10A-13R10-13) then with the second punching roll ( P10B-13) interacts with the associated patrix elevation (P10B-13R10-13). Embossing device according to claim 4, characterized in that the patrone roller (P9) and the die rollers (M9A, M9B) are arranged in a three-roller embossing device, wherein the protrusions (P9E1,2) are arranged on the patrone roller so that they Embossing process in tandem with the recesses (M9AR1,2) of the first (M9A) and the recesses (M9BR1,2) of the second die roll (M9B) cooperate. Embossing device according to claim 4, characterized in that the male roll (P9) and the die rolls (M9A, M9B) are arranged in pairs in a two-roll embossing device. Embossing device according to claim 5, characterized in that the die roll (M10-13) and the male roll (P10A-13, P10B-13) are arranged in a three-roll embossing device, wherein the recesses (M10-13R10-13) on such the die roller are arranged so that they co-operate in the embossing process with the elevations (P10A-13E10-13) of the first (P10A-13) and with the elevations (P10B-13R10-13) of the second Patrizenwalze (P10B-13). Embossing device according to claim 5, characterized in that the die roll (M10-13) and the male roll (P10A-13, P10B-13) are arranged in pairs in a two-roll embossing device. Embossing device according to one of claims 1 to 9, characterized in that the height or depth of the elevations and depressions and the number of embossing rollers are arranged and designed such that are generated by multiple embossing or raised reliefs whose height, or depth and Width are greater than the other structures. Device according to one of claims 1 to 10, characterized in that the diameter of one of the embossing rolls is made at least over the width of the web of the packaging material with a smaller diameter than the rest of the embossing roll by an amount S, where S is greater than 0, 02 mm. Device according to one of claims 1 to 11, characterized in that at least the surface of the embossing rollers made of metal, hard metal, hard material or ceramic, wherein the surface is optionally provided with a protective layer. Embossing device according to one of claims 1 to 12, characterized in that the embossing roller set in a quick-change device (30, 59) is arranged, which is designed such that the embossing rollers (36, 37) are individually and independently interchangeable, wherein the Embossing rollers (36, 37) are each rotatably supported in a roller carrier (34, 35) and the roller carriers are individually and independently removably mounted in a quick release housing in a unique position, one end of the male roller carrier (34) in a needle bearing ( 42) and its other end is held in a ball bearing (43). Embossing device according to claim 13, characterized in that the one roller support (34) has at its lower part a spring (49) and the bottom of the housing (31, 60) has a corresponding groove (48).

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