Abstract:
The method for the recognition of an authenticating mark on the surface of a packaging foil or an article by means of visual and/or electronic recognition means through an envelope is carried out by ultrasonic or X-ray techniques. In particular, the authenticating mark comprises at least one embossed authenticating mark having finest structures in the micrometer range, and the surface of the packaging foil or of the area of the article in which the authenticating mark is embossed is metallized or made of metal. In such a method, the package need not be opened or destroyed for inspection and the authenticating marks are not distinguishable from the outside in visible light.
Abstract:
The device for satinizing and embossing packaging foils comprises at least two embossing rollers that are each provided with a toothing consisting of individual teeth, the pyramidal teeth having an essentially rectangular horizontal projection, and the sides of the teeth being essentially parallel and perpendicular, respectively, to the longitudinal axis of the embossing roller. In contrast to the prior art, the opening angle (α) between the radially aligned adjacent tooth flanks (31FR, 32FR) is smaller than the opening angle (β) between the axially aligned adjacent tooth flanks (32FA, 33FA), and the tooth height (X) in the radial direction, measured from the tooth tip (ZS) to the tooth bottom (ZG1), is greater than the tooth height (Y) in the axial direction measured from the tooth tip (ZS) to the tooth bottom (ZG2). This dimensioning and arrangement of the teeth provides an improved gearing with a reduced specific pressure as well as an improved processing of the paper part of the foil that results in its better folding, curling, and tubing behavior.
Abstract:
In the method for creating colour patterns for technical applications and visible for the human eye by means of diffraction gratings through light irradiation, diffraction grating arrays are produced directly on a solid body surface in a laser microstructuring process by at least one laser installation in the nanosecond range or in the pico- or femtosecond range, each diffraction grating array being composed of subareas (81) whose longitudinal dimension has a value below the resolving ability of the eye and which contain at least one pixel (81, 82, 83), a pixel being a limited diffraction grating structure for producing a spectral colour. The direct application of such colour-producing diffraction grating structures to a solid body surface enables a large variety of decorative and authentication possibilities ranging from embossing tools to jewellery.
Abstract:
Die Vorrichtung zum Prägen und/oder Satinieren von Folien weist mindestens eine erste und eine zweite Prägewalze auf, zwischen denen das Flachmaterial unter Druck durchführbar ist, um ein Muster zu erzeugen. Der zweiten Prägewalze (3) ist mindestens eine weitere, mit der ersten (2) oder vorgehenden (3) Prägewalze zusammenwirkende Prägewalze (4) nachgeschaltet, zwischen denen das bemusterte Flachmaterial (6) durchführbar ist, um in einer Nachprägung das im wesentlichen gleiche Muster zu erhalten. In einer vereinfachten Ausführung sind nur insgesamt zwei Walzen (2, 4) vorhanden.Um eine möglichst präzise Prägung mit besonderen Effekten zu erzielen, ist die erste, angetriebene Prägewalze (2) mit Zähnen (8) versehen, während mindestens eine weitere Prägewalze (3, 4, 20) Ringe (10) oder Längsrippen (12) aufweist oder glatt ist.
Abstract:
In the method for producing masks and/or diaphragms for a laser installation for the creation of microstructures on a solid body surface according to the mask projection technique, predetermined opaque surface portions which scatter the laser radiation are produced in the mask and/or diaphragm substrate by roughening and modifying the latter by means of a femtosecond, picosecond or fluor laser beam. Such masks and diaphragms have a strongly improved lifetime and accuracy and may e.g. serve for the creation of blazed gratings which, arranged in diffraction grating arrays on a solid body surface, serve for producing spectral colours and mixed colours of high brilliance.
Abstract:
In the method for structuring at least one area of a solid body surface (9,10) provided with a ta-C coating, a mask (18) in the homogenous spot of the optical system is used in order to shape the beam in the mask projection technique and then a diaphragm (6) in front of the imaging optics. A structure is applied by means of an excimer laser (1) having pulse durations in the nanosecond range, a number of mask and diaphragm combinations (18, 6) being arranged in a exchanger device (28) and the exchanger device being adapted to place both one of the masks (18) and one of the diaphragms (6) in the beam path of the laser independently of each other, the masks (18) and diaphragms (6) being arranged in holders while being displaceable linearly or rotatively and rotatable about themselves. This method allows the rational manufacture of very complex, extremely fraud-resistant authentication features and/or of esthetically attractive, optical diffraction effective colored patterns. A device with such features is also defined.
Abstract:
In the method for structuring at least one area of a solid body surface (9,10) provided with a ta-C coating, by means of a first laser (1), preferably an excimer laser having pulse durations in the nanosecond range, a first structure is produced upon which a second, ripple-like structure is superposed by means of a second laser (15), having pulse durations in the picosecond or in the femtosecond range. Preferentially, the excimer laser structuring is carried out according to the mask projection technique and the picosecond or femtosecond laser (15) structuring according to the focus technique. This method allows the rational manufacture of very complex, extremely fraud-resistant authentication features and/or of esthetically attractive, optical diffraction effective colored patterns.
Abstract:
The foil embossing device (1) comprises an embossing roller (2L) and two counter-rollers (3, 4), one of the rollers (2L) being driven by a drive (6) and the rollers having a configuration where the teeth, rings, or ridges project from the base cylinder, at least the embossing roller (2L) having teeth (5, 5B) that project from the base cylinder and at least partly also serve for driving the counter-roller. To increase the uniformity of the embossing of the foil, the embossing roller (2L) has a diameter (D 2 ) that is reduced by 0.02 to 0.20 mm over a certain length (S d ) that is at least the same as the width (7 d ) of the foil. The length of the reduced diameter is preferably chosen so as to exceed the width (7 d ) of the foil being printed. Due to this depression (S), such a device allows a perfectly uniform embossing of foils of any kind independently of the design of the embossing rollers.
Abstract:
The method for structuring the surface of a steel embossing roller by means of short pulse laser, where the structuring is a macrostructuring with dimensions of over 20 μm and depths up to 150 μm and more, distinguishes itself by the following parameter combination: a) in single pulse operation a fluence in the range of 0.5 J/cm 2 to 3.5 J/cm2 and in burst operation a mean burst fluence of 0.5 J/cm 2 to 70 J/cm 2 per pulse, b) wavelength of 532 nm to 1064 nm, c) repetition rate of 1 kHz to 10 MHz, d) pulse to pulse spacing on the workpiece of 10 % to 50 % of the beam diameter for the femtosecond laser and of 10 - 25 % and 40 - 50 % of the beam width for the picosecond laser, e) laser pulse position near the workpiece surface, and f) deflection velocities of up to 100 m/s and more. *** Such a method allow manufacturing a complete embossing roller with teeth and gaps for producing logos, the teeth having variable heights, shapes, and spacings, for embossing e.g. innerliners for cigarette packaging.
Abstract translation:通过短脉冲激光器构造钢压花辊表面的方法,其结构是尺寸超过20μm,深度达150μm以上的宏观结构,通过以下参数组合来区分:a)在 单脉冲操作在0.5J / cm 2至3.5J / cm 2的范围内的通量,并且在脉冲操作中,每脉冲的平均脉冲通量为0.5J / cm 2至70J / cm 2,b)532nm至1064nm的波长,c )重复率为1 kHz至10 MHz,d)工件上的脉冲间距为飞秒激光束的光束直径的10%至50%,对于波长为10 - 25%和40 - 50%的光束宽度 皮秒激光,e)工件表面附近的激光脉冲位置,以及f)高达100m / s以上的偏转速度。 ***这种方法允许制造具有齿和间隙的完整压花辊,用于产生标识,齿具有可变的高度,形状和间距,用于压花例如。 卷烟包装内衬。
Abstract:
Beim Verfahren zur gezielten Strukturierung mindestens eines Bereiches einer Festkörperoberfläche mit einem vorzugsweise Femtosekunden-Laser entstehen gitterartige Strukturen im Nanometer-Bereich (Ripples, LIPPS), wobei die gezielte Strukturierung dadurch erzeugt wird, dass die Laserstrahlung polarisiert wird und zwischen der Polarisationsebene und der Oberfläche eine Relativbewegung durchgeführt wird, um die gitterartigen Strukturen anzuordnen. Dadurch können beispielsweise Authentifikationsmerkmale auf relativ grossen Flächenbereichen, beispielsweise von Druckwalzen, erzeugt werden, die dann auf Verpackungsfolien geprägt werden können. In einem weiteren Anwendungsbereich kann mit obigen Verfahren die Oberfläche von Werkstücken derart verändert werden, dass durch die geordneten gitterartigen Nanostrukturen spanabhebende, ölrückhaltende oder haftende Eigenschaften verbessert werden können.