This application is a national stage application under 35 U.S.C. 371 and claims the benefit of PCT Application No. PCT/IB2017/052585 having an international filing date of 4 May 2017, which designated the United States, which PCT application claimed the benefit of European Patent Application No. 16172096.6 filed 31 May 2016, the disclosure of each of which are incorporated herein by reference.
The invention relates to the technical field of fine embossing in metal coated planar material, more particularly to the embossing of a logo as a transitory image against a background, using at least two embossing rollers.
The invention is more particularly adapted for embossing packaging films for the tobacco industry or for the foodstuff industry, for example so-called inner liners which are wrapped about a number of cigarettes, or packaging material for chocolate, butter or similar foodstuff, electronic components, jewelry of watches.
It is known to produce security marks or esthetical improvements of metal coated embossed film in an online production chain using techniques described for example in the publication WO02/30661 to the present inventor. The production method described therein produces a so-called shadow effect that has a considerable contrast ratio. In order to produce this effect, a roller embossing process is used in which imaging pyramids on the embossing rollers are reduced in size or modified in such a way that light arriving under determined angles on the embossed films is reflected or reflected away.
It is known from developments of the intaglio technique in the printing industry that the use of picture elements in groups of parallel lines—image forming pattern elements or latent image structures—may improve the security against copying. Reference is made to publication EP 0 146 151 to De la Rue Giori SA. The relief-like groups of lines allow to make a so-called optical tilting effect, a change of picture at the same location depending on an angle of viewing, or as it is called in relevant literature using the term transitory effects—transitory image. The contrast can be durably improved by coating the recesses of the intaglio template with ink, as it is being done for example in the field of bank notes. The intaglio recesses are the underlying reason for the fact that the tilting effect is lost when copying, and this provides a real improvement of security.
U.S. Publication Pat. No. 4,033,059 describes a more ancient printing variant in which the intaglio technique is used to obtain transitory images on a paper web. A paper web as described in this publication has a longitudinal centerline and a transverse centerline, and comprises a plurality of first regions and a plurality of second regions. The first regions form boundaries separating the second regions, the first regions being substantially in a plane of the paper web. The second regions comprise a plurality of raised out-of-said-plane rib-like elements, the rib-like elements of each second region being disposed parallel to a major rib axis and perpendicular to a minor rib axis. All or most of each first regions have both major rib axis and minor rib axis components. The first and second regions undergo geometric deformation when the web material is subjected to an applied elongation along at least one axis. This approach, which remains interesting in a theoretical consideration, fails in reality because the simultaneous mastering of the contrast ratios in two or more transitory pictures at the same location is very difficult to achieve. When using soft materials, it is possible to obtain a line density of 100 to 1000 lines per inch, and this provides relatively good contrasts in an individual picture.
US publication U.S. Pat. No. 6,296,281 B1 provides a desirable improvement of the security print when embossing groups of lines, as compared to U.S. Pat. No. 4,033,059. The groups of lines are made either by the process of intaglio printing or so-called blind embossing, and are colored with black or colored ink. The use of interrupted line structures in this publication allows to address the disadvantage of U.S. Pat. No. 4,033,059 by improving the varying contrast ratios between two latent pictures.
An example of embossed groups of lines made by the process of blind embossing, wherein lines are colored with ink, for example black ink and the background is a white colored surface of the embossed material is shown in
An important industrial use of embossing techniques is the online roller embossing of metal coated inner liner planar material, e.g., in the food industry or for tobacco products.
Planar material to be embossed may generally be either inner liners—cigarette pack inner liners—or foils, which may generally be called thin foils. Foils typically may have a thickness from about 5 μm to about 400 μm. Such foils may in some cases be used as inner liners, which are used, e.g., in cigarette packaging—cigarette pack inner liners—and may for example be made out of metal coated paper, e.g., vapor coated base paper or aluminum layered paper. These foils and inner liners are thus thin and relatively un-elastic, i.e., very hard. They are often particularly adapted for food safe packaging because they are to a high degree impermeable to water vapor.
Foils and inner liners can be directly and quickly embossed using rollers with hard steel surfaces.
Following types of inner liners may for example be relevant:
It is further known to have simple uses of embossing by using lines in the range of millimeters to obtain mechanical creasing or softening of paper, whereby this does not produce any optical effects such as reflexion of diffraction. Reference is made for example to US publication U.S. Pat. No. 6,458,447 B1.
The solution known from prior art reference WO02/30661 for position dependent picture representations is to be improved, with the aim of preserving the contrast ratios and the pronounced tilting effect, and achieving a better security against copying for at least two latently present transitory pictures. The invention further aims at providing a solution for a device and a method that may be used in production scenarios where planar material, e.g., metal coated planar material, is embossed by means of roller embossing with typical industrial speeds.
The metal coated planar material to be embossed has for example a thickness between 25 μm and 80 μm.
Since the embossed planar material is to be used for food packaging, e.g., tobacco, butter, chocolate, it should not be treated with ink or any other similar substances. The invention should avoid the use of ink while still allowing to achieve good contrasts, even when using normal types of paper and in mass production scenarios. At the same time the invention should be usable for production speeds in rotation embossing processes of for example 300 meters/minute, which may correspond to about 1000 packages per minute. It will easily be understood that no ink would be able to try under such production speeds.
In a first aspect the invention provides a method for embossing a first grating in a planar material, by means of an embossing body and a counter embossing body, having each a hard surface, the first grating to be embossed comprising alternating substantially parallel and straight ridges and recesses, whereby the top surfaces of the ridges are intended to weaken a direct angular reflection of light by diffuse omnidirectional reflection, thereby producing a visible contrast between the ridges and the recesses. The method comprises on the embossing body providing a first plurality of obtuse pyramids with respective rhomboid-shaped bases which are on the hard surface of the embossing body, and the obtuse summits of which face away from the hard surface of the embossing body, the first plurality of obtuse pyramids being intended to emboss the recesses of the first grating by exerting pressure on a first side of the planar material, the first plurality of obtuse pyramids forming first intermitted lines (row1, row2) corresponding to the intended recesses, and the pyramids in each subset corresponding to one of the first intermitted lines, being separated from each other between their bases by a determined distance that creates a gap in the line in such a manner that each gap from a line of pyramids may be connected to a corresponding gap from an adjacent line of pyramids by an imaginary line perpendicular to both of the adjacent lines; and roughening portions of the hard surface of the embossing body, the portions being located between adjacent lines of pyramids and intersecting at least one of the imaginary lines that connect one gap from one line to the corresponding gap from the adjacent line. The method further comprises on the counter embossing body providing a second plurality of obtuse pyramids with respective rhomboid-shaped bases which are on the hard surface of the counter embossing body, and the obtuse summits of which face away from the hard surface of the counter embossing body, the second plurality of obtuse pyramids being intended to emboss the ridges of the first grating by exerting pressure on a second side of the planar material opposite to the first side, the second plurality of obtuse pyramids forming second intermitted lines (row3, row4) corresponding to the intended ridges, and the pyramids in each subset corresponding to one of the second intermitted lines, being separated from each other between their bases by the determined distance, and the pyramids being positioned on their respective second intermitted lines in such a manner that during embossing their obtuse summits press the planar material against a roughened portion of the hard surface of the embossing body, thereby satinizing the top surfaces of the ridges on the first side.
In a preferred embodiment, the method further comprises embossing a second grating enclosed in a determined perimeter delimiting an image, whereby alternating and substantially parallel ridges and recesses of the second grating are in a first determined angle to the ridges and recesses of the first grating. The method comprises on the embossing body providing a third plurality of obtuse pyramids with rhomboid shaped bases in a similar manner as providing the first plurality of obtuse pyramids but according to third intermitted lines corresponding to the recesses to emboss of the second grating, in a first area of the hard surface of the embossing body, corresponding to the enclosure of the determined perimeter, instead of providing obtuse pyramids from the first plurality; and roughening portions of the hard surface of the embossing body, that are located between adjacent lines of pyramids inside the enclosure of the determined perimeter, in a manner similar as described for the first plurality of pyramids but adapted to positions of the third plurality of pyramids. The method further comprises on the counter embossing body providing a fourth plurality of obtuse pyramids with rhomboid shaped bases in a similar manner as providing the second plurality of obtuse pyramids but according to fourth intermitted lines corresponding to the intended ridges to emboss of the second grating, in a second area of the hard surface of the counter embossing body, corresponding to the enclosure of the determined perimeter, instead of providing obtuse pyramids from the second plurality.
In a further preferred embodiment the embossing body and the counter embossing body are configured to cooperate amongst each other in a planar embossing process, whereby the embossing body comprises any one of the list comprising a 2 dimensional surface, a surface exhibiting 3D structures, an undulated surface.
In a further preferred embodiment the embossing body and the counter embossing body are configured to cooperate amongst each other as rollers in a roller embossing process.
In a further preferred embodiment the rollers are synchronized among each other by means of toothed wheels.
In a further preferred embodiment the planar material is a metal foil.
In a further preferred embodiment the planar material is metal coated on the first side.
In a further preferred embodiment the hard surface comprises a hard coating.
In a further preferred embodiment the hard coating comprises TaC.
In a further preferred embodiment the roughening comprises a treatment of the hard surface with a focused pico- or femto-second laser in order to produce elevated microstructures.
In a further preferred embodiment the determined distance is null.
In a second aspect, the invention provides a device for embossing a first grating in a planar material, by means of an embossing body and a counter embossing body having each a hard surface, the first grating to be embossed comprising alternating substantially parallel and straight ridges and recesses, whereby the top surfaces of the ridges are intended to weaken a direct angular reflection of light by diffuse omnidirectional reflection, thereby producing a visible contrast between the ridges and the recesses. The device comprises on the embossing body a first plurality of obtuse pyramids with respective rhomboid-shaped bases which are on the hard surface of the embossing body, and the obtuse summits of which face away from the hard surface of the embossing body, the first plurality of obtuse pyramids being intended to emboss the recesses of the first grating by exerting pressure on a first side of the planar material, the first plurality of obtuse pyramids forming first intermitted lines (row1, row2) corresponding to the intended recesses, and the pyramids in each subset corresponding to one of the first intermitted lines, being separated from each other between their bases by a determined distance that creates a gap in the line in such a manner that each gap from a line of pyramids may be connected to a corresponding gap from an adjacent line of pyramids by an imaginary line perpendicular to both of the adjacent lines; and roughed portions of the hard surface of the embossing body, that are located between adjacent lines of pyramids and intersect at least one of the imaginary lines that connect one gap from one line to the corresponding gap from the adjacent line. The device further comprises on the counter embossing body a second plurality of obtuse pyramids with respective rhomboid-shaped bases which are on the hard surface of the counter embossing body, and the obtuse summits of which face away from the hard surface of the counter embossing body, the second plurality of obtuse pyramids being intended to emboss the ridges of the first grating by exerting pressure on a second side of the planar material opposite to the second side, the second plurality of obtuse pyramids forming second intermitted lines (row3, row4) corresponding to the intended ridges, and the pyramids in each subset corresponding to one of the second intermitted lines, being separated from each other between their bases by the determined distance, and the pyramids being positioned on their respective second intermitted lines in such a manner that during embossing their obtuse summits press the planar material against a roughened portion of the hard surface of the embossing body, thereby satinizing the top surfaces of the ridges on the first side.
In a further preferred embodiment the device is adapted for embossing a second grating enclosed in a determined perimeter delimiting an image, whereby alternating and substantially parallel ridges and recesses of the second grating are in a first determined angle to the ridges and recesses of the first grating. The device comprises on the embossing body a third plurality of obtuse pyramids with rhomboid shaped bases in a similar manner as the first plurality of obtuse pyramids but according to third intermitted lines corresponding to the recesses to emboss of the second grating, in a first area of the hard surface of the embossing body, corresponding to the enclosure of the determined perimeter, instead of having obtuse pyramids from the first plurality; and roughed portions of the hard surface of the embossing body, that are located between adjacent lines of pyramids inside the enclosure of the determined perimeter, in a manner similar as described for the first plurality of pyramids but adapted to positions of the third plurality of pyramids. The device further comprises on the counter embossing body a fourth plurality of obtuse pyramids with rhomboid shaped bases in a similar manner as providing the second plurality of obtuse pyramids but according to fourth intermitted lines corresponding to the intended ridges to emboss of the second grating, in a second area of the hard surface of the counter embossing body, corresponding to the enclosure of the determined perimeter, instead of having obtuse pyramids from the second plurality.
In a further preferred embodiment the embossing body and the counter embossing body are configured to cooperate amongst each other in a planar embossing process, whereby the embossing body comprises any one of the list comprising a 2 dimensional surface, a surface exhibiting 3D structures, an undulated surface.
In a further preferred embodiment the embossing body and the counter embossing body are configured to cooperate amongst each other as rollers in a roller embossing process.
In a further preferred embodiment the rollers are synchronized among each other by means of toothed wheels.
In a further preferred embodiment the planar material is a metal foil.
In a further preferred embodiment the planar material is metal coated on the first side.
In a further preferred embodiment the hard surface comprises a hard coating.
In a further preferred embodiment the hard coating comprises TaC.
In a further preferred embodiment the roughed surface results from a treatment of the hard surface with a focused pico- or femto-second laser in order to produce elevated microstructures.
In a further preferred embodiment the determined distance is null.
In a third aspect the invention provides a method for embossing a first grating in a planar material, by means of an embossing body and a counter embossing body having each a hard surface, the first grating to be embossed comprising alternating substantially parallel and straight ridges and recesses, whereby the top surfaces of the ridges are intended to weaken a direct angular reflection of light by diffuse omnidirectional reflection, thereby producing a visible contrast between the ridges and the recesses. The embossing body comprises a first plurality of obtuse pyramids with respective rhomboid-shaped bases which are on the hard surface of the embossing body, and the obtuse summits of which face away from the hard cylindrical surface of the embossing body, the first plurality of obtuse pyramids being intended to emboss the recesses of the first grating by exerting pressure on a first side of the planar material, the first plurality of obtuse pyramids forming first intermitted lines (row1, row2) corresponding to the intended recesses, and the pyramids in each subset corresponding to one of the first intermitted lines, being separated from each other between their bases by a determined distance that creates a gap in the line in such a manner that each gap from a line of pyramids may be connected to a corresponding gap from an adjacent line of pyramids by an imaginary line perpendicular to both of the adjacent lines; roughed portions of the hard surface of the embossing body, that are located between adjacent lines of pyramids and intersect at least one of the imaginary lines that connect one gap from one line to the corresponding gap from the adjacent line. The counter embossing body comprises a second plurality of obtuse pyramids with respective rhomboid-shaped bases which are on the hard surface of the counter embossing body, and the obtuse summits of which face away from the hard surface of the counter embossing body, the second plurality of obtuse pyramids being intended to emboss the ridges of the first grating by exerting pressure on a second side of the planar material opposite to the first side, the second plurality of obtuse pyramids forming second intermitted lines (row3, row4) corresponding to the intended ridges, and the pyramids in each subset corresponding to one of the second intermitted lines, being separated from each other between their bases by the determined distance, and the pyramids being positioned on their respective second intermitted lines in such a manner that during embossing their obtuse summits press the planar material against one of the roughed portion of the hard surface of the embossing roller, thereby satinizing the top surfaces of the ridges. The method comprises embossing the planar material with the embossing body and the counter embossing body.
In a further preferred embodiment the method is further for embossing a second grating enclosed in a determined perimeter delimiting an image, whereby alternating and substantially parallel ridges and recesses of the second grating are in a first determined angle to the ridges and recesses of the first grating. The embossing body further comprises a third plurality of obtuse pyramids with rhomboid shaped bases in a similar manner as providing the first plurality of obtuse pyramids but according to third intermitted lines corresponding to the recesses to emboss of the second grating, in a first area of the hard surface of the embossing body, corresponding to the enclosure of the determined perimeter, instead of providing obtuse pyramids from the first plurality; roughed portions of the hard surface of the embossing body, that are located between adjacent lines of pyramids inside the enclosure of the determined perimeter, in a manner similar as described for the first plurality of pyramids but adapted to positions of the third plurality of pyramids. The counter embossing body further comprises a fourth plurality of obtuse pyramids with rhomboid shaped bases in a similar manner as providing the second plurality of obtuse pyramids but according to fourth intermitted lines corresponding to the intended ridges to emboss of the second grating, in a second area of the hard surface of the counter embossing body, corresponding to the enclosure of the determined perimeter, instead of having obtuse pyramids from the second plurality.
The invention will be better understood from the following detailed description of preferred embodiments and in light of the drawings, wherein
Same references that are used throughout different figures correspond to same or similar features.
The state of the art may be understood for example from a simple transitory image made according to the intaglio technique as illustrated in
In the following, three viewing positions are described that provide particularly distinguished views, i.e., either the background R, the logo F, or a uniform grey surface of the film M, also referred to as image plane.
Optical Effects
When viewing perpendicularly to the image plane or film M, e.g., as represented in
Referring to
Referring again to
Transitory Images Using Embossed Metal Coated Planar Material
It is apparent from the afore given explanations that the intaglio print of line structures causes light to be absorbed dependent from an angle of incidence and/or viewing. If this were not the case, it would not be possible to switch between images.
In order to achieve esthetically more pleasing images it is desirable to use a metal coated planar material, as this allows to obtain nearly perfect mirroring effects, especially as compared to the white coated film M of
Furthermore it is imperative to produce a tilt dependent contrast.
It is known from the international publication WO 2015/028939 A1, that when embossing according to the Pater Mater (male female embossing) process, the contrast, or the clear recognizability of free surfaces can be improved with in part elevated flat surfaces of any form, in this case called facets or polygons, which are raised on the male die roller or recessed on the female die roller. The facets mark the individual surface parts and are designed through size and arrangement such that because of the higher specific embossing print, great brilliance and thus a good aesthetic impression of the total embossing is created. This impression is created through the image processing of the human eye with the help of refraction edges, which cause a locally elevated embossing print.
In prior art, the Pater Mater embossing tools are paired by means of etching or mechanically manufactured with a relative large amount of effort. A method for making elevated and/or depressed structures involves for example making use of the teachings from WO 2015/028939 A1 and WO 2013/041430.
It has for example been found while developing absorbing layers (mattings) that may be obtained by means of embossing, that a pixelation occurs. This term will be better understood in view of
Embossing Tools for Producing Transitory Pictures
As is explained in WO 2015/028939 A1 and WO 2013/041430, it is already possible to form fine 3-dimensional structures in the range of 10 μm to 100 μm by means of short pulsed laser erosion on roller surfaces of steel.
Example dimensions for the illustrated rhomboid based obtuse pyramids are:
A distance c separating two pyramids of one line by their bases may for example be
A further distance d separating two pyramids between two adjacent lines of pyramids may for example be
In a preferred embodiment the sides of the rhomboid shaped bases which are directed along the line structure to emboss, are substantially parallel to the line structure. More particularly this concerns lines referenced with dimension a1.
When embossing planar material—as will be explained in more detail later on in this description—it is possible that the required pressures lead to rubbed-off parts of the planar material, that should not remain around in the grid and here are evacuated through gaps separating the obtuse pyramids.
It is noted that as a number of embossing elements increases, unique embossing images are obtained that have a high level of copy protection.
In a further preferred embodiment not illustrated in the figures, the distance separating two pyramids of one line by their bases may be null. In fact the pyramids may in this case be formed such that neighboring pyramids adjoin to form a continuous line.
Pixelation
It results from the foregoing that the line structure requires contrasts which may not be provided with ink because of the degree of fineness, nor may they be provided by means of prior art embossing, such as for example the classical satinizing.
According to an example embodiment of the invention, a satin effect on metal coated planar material may be obtained through pinup-pinup embossing which on a significant surface of the embossed line structures changes the otherwise mirror like reflecting metal surface in such a manner to refract incoming light such that this is reflected in a diffuse fashion. As a result the human eye viewing at a distance of 30 cm does not anymore see any details of lines.
Using newly developed short pulsed laser structuring processes—such as for example the ones described in the not yet published European patent application EP15201862—it has become possible to make surface structures in the range of 10 μm. These structures may for example be used to emboss the metal side of a metal coated planar material in order to produce a pronounced local satinizing effect due to a so-called micro-satinizing effect.
While the surface of the embossing roller is here said to be hard, it may in fact also be a surface with a hard coating.
Turning now to
Returning now to
Returning now to
Returning for
The illustrations of lines of pyramids shown in circles drawn over zones a)-d) is for illustrative purposes only—notably the orientation shown in the circle for zone a) does not necessarily correspond to the Row1 and Row2. However the effect of the illustration is to show that the orientation of the rhomboid pyramids is along lines that are in different angles from one zone to another zone. A number of orientations of the rhomboid shapes of the pyramids is given by way of example with angles of 45° as illustrated at a bottom part of
Another illustration of principle is shown in
As already mentioned the arrangement of pyramids shown in
A resulting embossed planar material (also not illustrated) contains zones of gratings corresponding to embossing zones a)-d) because having been produced by these zones, each zone producing a different effect when exposed to light that reflects on it. A viewing angle would thus reveal different reflected light intensities for every zone, such that by varying the viewing angle it is possible to discern either one of the images represented by the zones, i.e., the background for zone c), non-intersected parts of the number 60 for zone a), non-intersected parts of the logo BG for zone d) and intersections of the number 60 with the logo BG for zone d).
Embossment Bodies
The examples given above consistently make reference to embossing body and counter embossing body. For example in reference to the example illustrated in
Various actual embodiments are possible for the embossing bodies.
In one preferred embodiment, the embossing body and the counter embossing body are configured to cooperate amongst each other in a planar embossing process. In other word the surface of the embossing body and the surface of the counter embossing surface on which respectively the obtuse pyramids are made, are substantially plane.
In further preferred embodiments of the planar embossing process, the embossing body comprises any one of the list comprising a 2 dimensional surface, a surface exhibiting 3D structures, an undulated surface.
In another preferred embodiment illustrated schematically in
At the time of embossing, the planar material (not illustrated in the figure) is inserted and pulled in the gap between both rollers 150 and 151. The hard cylindrical surfaces of each roller 150 and 151 comprises obtuse pyramids as described herein above. For example obtuse pyramids 700 may be made on the cylindrical surface of embossing roller 150 and obtuse pyramids on the cylindrical surface of counter embossing roller 151 (pyramids not illustrated in the figure).
The hard surface of the embossing bodies is necessary to form the above discussed roughened surface, but also possibly the obtuse pyramids. Such surface may for example comprise TaC.
The roughening of the hard surface is preferably obtained by means of a treatment of the hard surface with a focused pico- or femto-second laser in order to produce elevated microstructures. Preferably the elevated microstructures are sized in the range of 10 to 15 μm.
Method 1: A method for embossing a first grating in a planar material with an embossing body and a counter embossing body,
the embossing body including,
a first plurality of obtuse pyramids with respective rhomboid-shaped bases on a hard surface of the embossing body, obtuse summits of the respective first plurality of obtuse pyramids facing away from the hard surface of the embossing body, the first plurality of obtuse pyramids configured to emboss recesses of the first grating, the first plurality of obtuse pyramids forming first intermitted lines corresponding to the recesses, and the pyramids in each subset corresponding to one of the first intermitted lines, the first plurality of obtuse pyramids separated from each other at their bases by a determined distance that creates a gap in a corresponding first intermitted line such that each gap from a line of pyramids connects to a corresponding gap from an adjacent line of pyramids by an imaginary line perpendicular to both of the adjacent lines; and
roughening portions of the hard surface of the embossing body, the portions located between adjacent lines of pyramids and intersecting at least one of the imaginary lines that connect one gap from one line to the corresponding gap from the adjacent line; and the counter embossing body including,
a second plurality of obtuse pyramids with respective rhomboid-shaped bases on a hard surface of the counter embossing body, obtuse summits of the respective second plurality of obtuse pyramids facing away from the hard surface of the counter embossing body, the second plurality of obtuse pyramids configured to emboss the ridges of the first grating, the second plurality of obtuse pyramids forming second intermitted lines corresponding to the ridges, and the pyramids in each subset corresponding to one of the second intermitted lines, the second plurality of obtuse pyramids separated from each other at their bases by the determined distance, and the second plurality of pyramids being arranged on their respective second intermitted lines such that during embossing their obtuse summits press the planar material against the roughened portions of the hard surface of the embossing body,
the method comprising the steps of:
feeding the planar material between the embossing body and the counter-embossing body;
embossing the planar material with the recesses of the first grating by exerting pressure on a first side of the planar material with the first plurality of obtuse pyramids, and embossing the planar material with the ridges of the first grating by exerting pressure on a second side of the planar material opposite to the first side with the second plurality of obtuse pyramids; and
satinizing top surfaces of the ridges on the first side of the planar material by pressing the obtuse summits of the second plurality of obtuse pyramids against the planar material towards the roughened portions of the hard surface of the embossing body,
wherein the first grating includes alternating substantially parallel and straight ridges and recesses, the top surfaces of the ridges configured to weaken a direct angular reflection of light by diffuse omnidirectional reflection to produce a visible contrast between the ridges and the recesses.
Method 2: The method 1, further comprising a step of:
embossing the planar material with a second grating in a determined perimeter delimiting an image, alternating and substantially parallel ridges and recesses of the second grating are in a first determined angle to the ridges and recesses of the first grating,
the embossing body further including,
a third plurality of obtuse pyramids with rhomboid shaped bases according to third intermitted lines corresponding to the recesses of the second grating, in a first area of the hard surface of the embossing body, corresponding to an area of the determined perimeter; and
roughening portions of the hard surface of the embossing body, located between adjacent lines of pyramids inside the area of the determined perimeter, arranged at positions of the third plurality of pyramids;
the counter embossing body further including,
a fourth plurality of obtuse pyramids with rhomboid shaped bases according to fourth intermitted lines corresponding to the ridges to emboss the second grating, in a second area of the hard surface of the counter embossing body, corresponding to the area of the determined perimeter.
Method 3: The method 1, wherein the embossing body and the counter embossing body are configured to cooperate amongst each other in a planar embossing process, whereby the embossing body comprises any one of the list comprising a 2 dimensional surface, a surface exhibiting 3D structures, an undulated surface.
Method 4: The method 1, wherein the embossing body and the counter embossing body are configured to cooperate amongst each other as rollers in a roller embossing process.
Method 4′: The method 4, wherein the rollers are synchronized among each other by means of toothed wheels.
Method 5: The method 1, wherein the planar material is a metal foil.
Method 6: The method 1, wherein the planar material is metal coated on the first side.
Method 7: The method 1, wherein the hard surface includes a thermal adhesive coating.
Method 7′: The method 1, wherein the hard surface comprises a hard coating.
Method 7″: The method 7′, wherein the hard coating comprises TaC
Method 8: The method 1, wherein the roughening is formed by a treatment of the hard surface with a focused pico- or femto-second laser in order to produce elevated microstructures.
Method 8′: The method 1 wherein the determined distance is null
Device 9: A device for embossing a first grating in a planar material, the first grating having alternating substantially parallel and straight ridges and recesses, top surfaces of the ridges configured to weaken a direct angular reflection of light by diffuse omnidirectional reflection to produce a visible contrast between the ridges and the recesses, the device comprising:
an embossing body having a hard surface; and
a counter embossing body having a hard surface, wherein the embossing body includes,
a first plurality of obtuse pyramids with respective rhomboid-shaped bases on a hard surface of the embossing body, obtuse summits of the respective first plurality of obtuse pyramids facing away from the hard surface of the embossing body, the first plurality of obtuse pyramids configured to emboss recesses of the first grating, the first plurality of obtuse pyramids forming first intermitted lines corresponding to the recesses, and the pyramids in each subset corresponding to one of the first intermitted lines, the first plurality of obtuse pyramids separated from each other at their bases by a determined distance that creates a gap in a corresponding first intermitted line such that each gap from a line of pyramids connects to a corresponding gap from an adjacent line of pyramids by an imaginary line perpendicular to both of the adjacent lines;
roughening portions of the hard surface of the embossing body, the roughening portions being located between adjacent lines of pyramids and intersecting at least one of the imaginary lines that connect one gap from one line to the corresponding gap from the adjacent line; and
the counter embossing body includes,
a second plurality of obtuse pyramids with respective rhomboid-shaped bases on a hard surface of the counter embossing body, obtuse summits of the respective second plurality of obtuse pyramids facing away from the hard surface of the counter embossing body, the second plurality of obtuse pyramids being configured to emboss the ridges of the first grating, the second plurality of obtuse pyramids forming second intermitted lines corresponding to the ridges, and the pyramids in each subset corresponding to one of the second intermitted lines, the second plurality of obtuse pyramids separated from each other at their bases by the determined distance, and the second plurality of pyramids being arranged on their respective second intermitted lines such that during embossing their obtuse summits press the planar material against the roughened portions of the hard surface of the embossing body to satinize the top surfaces of the ridges on the first side.
Device 10: The device of device 9, further adapted for embossing a second grating in a determined perimeter delimiting an image, alternating and substantially parallel ridges and recesses of the second grating are in a first determined angle to the ridges and recesses of the first grating, the embossing body further including, a third plurality of obtuse pyramids with rhomboid shaped bases according to third intermitted lines corresponding to the recesses to emboss the second grating, in a first area of the hard surface of the embossing body, corresponding to an area of the determined perimeter;
roughed portions of the hard surface of the embossing body, located between adjacent lines of pyramids inside the area of the determined perimeter, adapted to positions of the third plurality of pyramids,
the counter embossing body further including,
a fourth plurality of obtuse pyramids with rhomboid shaped bases according to fourth intermitted lines corresponding to the ridges to emboss the second grating, in a second area of the hard surface of the counter embossing body, corresponding to the area of the determined perimeter.
Device 11: The device according to Device 9, wherein the embossing body and the counter embossing body are configured to cooperate amongst each other in a planar embossing process, whereby the embossing body comprises any one of the list comprising a 2 dimensional surface, a surface exhibiting 3D structures, an undulated surface.
Device 12: The device according to device 9, wherein the embossing body and the counter embossing body are configured to cooperate amongst each other as rollers in a roller embossing process.
Device 12′: The device of device 12, wherein the rollers are synchronized among each other by means of toothed wheels
Device 13: The device according to device 9, wherein the planar material is a metal foil.
Device 14: The device according to device 9, wherein the planar material is metal coated on the first side.
Device 15: The device according to device 9, wherein the hard surface includes a thermal adhesive coating.
Device 15′: The device according to Device 9, wherein the hard surface comprises a hard coating.
Device 15″: The device according to Device 15′, wherein the hard coating comprises TaC
Device 16: The device according to device 9, wherein the roughed surface is formed by a treatment of the hard surface with a focused pico- or femto-second laser in order to produce elevated microstructures.
Device 16′: The device according to device 9, wherein the determined distance in null.
Device 17: A device of manufacturing an embossing body and a counter embossing body each having a hard surface, the embossing body and the counter embossing body configured to emboss a first grating in a planar material, the first grating including alternating substantially parallel and straight ridges and recesses, the top surfaces of the ridges configured to weaken a direct angular reflection of light by diffuse omnidirectional reflection to produce a visible contrast between the ridges and the recesses, the device comprising the steps of:
forming a first plurality of obtuse pyramids with respective rhomboid-shaped bases on the hard surface of the embossing body, obtuse summits of the plurality of obtuse pyramids face away from the hard cylindrical surface of the embossing body, the first plurality of obtuse pyramids configured to emboss the recesses of the first grating by exerting pressure on a first side of the planar material, the first plurality of obtuse pyramids forming first intermitted lines corresponding to the recesses, and the pyramids in each subset corresponding to one of the first intermitted lines, being separated from each other between their bases by a determined distance that creates a gap in the line such that each gap from a line of pyramids are connected to a corresponding gap from an adjacent line of pyramids by an imaginary line perpendicular to both of the adjacent lines;
forming roughed portions of the hard surface of the embossing body, located between adjacent lines of pyramids and intersect at least one of the imaginary lines that connect one gap from one line to the corresponding gap from the adjacent line;
forming a second plurality of obtuse pyramids with respective rhomboid-shaped bases on the hard surface of the counter embossing body, obtuse summits of the plurality of obtuse pyramids face away from the hard surface of the counter embossing body, the second plurality of obtuse pyramids configured to emboss the ridges of the first grating by exerting pressure on a second side of the planar material opposite to the first side, the second plurality of obtuse pyramids forming second intermitted lines corresponding to the ridges, and the pyramids in each subset corresponding to one of the second intermitted lines, being separated from each other at their bases by the determined distance, and the pyramids being positioned on their respective second intermitted lines such that during embossing their obtuse summits press the planar material against one of the roughed portion of the hard surface of the embossing roller, thereby satinizing the top surfaces of the ridges.
Device 18: The device of manufacturing according to device 17, the embossing body and the counter embossing body further used for embossing a second grating in a determined perimeter delimiting an image, alternating and substantially parallel ridges and recesses of the second grating are in a first determined angle to the ridges and recesses of the first grating, the device further comprising the steps of:
forming a third plurality of obtuse pyramids with rhomboid shaped bases according to third intermitted lines corresponding to the recesses to emboss the second grating, in a first area of the hard surface of the embossing body, corresponding to the area of the determined perimeter;
forming roughed portions of the hard surface of the embossing body, located between adjacent lines of pyramids inside the area of the determined perimeter, adapted to positions of the third plurality of pyramids;
forming a fourth plurality of obtuse pyramids with rhomboid shaped bases according to fourth intermitted lines corresponding to the ridges to emboss of the second grating, in a second area of the hard surface of the counter embossing body, corresponding to the area of the determined perimeter.
Device 19: The device according to device 18, further comprising a step of:
coating the hard surface with a thermal adhesive coating.
Device 20: The device according to device 18, wherein the step of forming the roughed portions is performed by a treatment of the hard surface with a focused pico- or femto-second laser to produce elevated microstructures.
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16172096 | May 2016 | EP | regional |
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PCT/IB2017/052585 | 5/4/2017 | WO |
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WO2017/208092 | 12/7/2017 | WO | A |
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