CZ288045B6 - Method for producing security elements for the electronic protection of articles - Google Patents

Abstract

The proposed security elements are produced from at least two layers. The first layer (2) of a cellulose material (6) being still in moist state is applied to the second layer (3) of another cellulose material (5), whereby magnetically soft elements (4) are added to one of the layers (2, 3). The magnetically soft elements (4) transmit a characteristic signal in an inquiry field of a device for electronic securing of articles. Security elements (1) of a desired shape are cut out of both the layers (2, 3) in dry state.

Description

Method of manufacturing insurance elements for electronic security of goods

Technical field

The invention relates to a method of manufacturing security elements for the electronic security of goods, wherein the security elements are made of at least two layers. Furthermore, the invention relates to a security element produced by the method of the invention.

BACKGROUND OF THE INVENTION

From EP 0 340 034 B1 there is already known a security element for electronic securing of goods in warehouses in department stores, which contains fibers of a material with high permeability and low coercive force. These fibers are either present in the paper substrate or are adhered to the substrate. The arrangement of the fibers in the substrate or on the substrate is entirely arbitrary, which makes it relatively likely that the fibers overlap with other fibers and bind them magnetically. Thereby, the magnetic flux of the fibers is concentrated and amplified, so that the locking elements described in the patent can be detected independently of their orientation with respect to the sensing field of the electronic locking system.

SUMMARY OF THE INVENTION

The invention solves a method of manufacturing reliable operating security elements with favorable costs for electronic security of goods. It is an object of the invention that the first cellulosic material layer is applied to the second cellulosic material layer while it is still wet, with magnetically soft elements added to one of the two layers which emit a characteristic signal in the interrogation field of the goods securing device. Then, in the dried state, the security elements of the desired shape are punched or cut from both layers.

The advantage of the method according to the invention can be seen in that the layer with the magnetically soft elements can be very thin, since it is supported by a second, thicker layer. The layer of magnetically soft elements can therefore be made from a very dilute paper suspension, as described in more detail below, which brings enormous advantages in terms of the subsequent arrangement and processable lengths of the magnetically soft fibers in the still wet cellulosic mass of the layer. Furthermore, since the two layers are adhered to each other in a still wet state, they adhere firmly to one another after drying, without any further steps, for example gluing the two layers.

According to a preferred method according to the invention, it is provided that the magnetically soft elements, which are fibers of very small diameter, are arranged in the wet state by externally acting forces substantially in the longitudinal direction of the material path of the two layers. Such an arrangement takes place in accordance with a particularly advantageous method variant in that a device is provided above or below the layer of cellulosic mass containing the soft-soft fibers which produces a magnetic field in the longitudinal direction or in the direction of the path of the material. Since the cellulosic mass is still in a wet state at this point in time, the fibers are rectified by the magnetic field in the direction of the material path. Alternatively, the rectification of the fibers in the longitudinal direction of the material path may also be forced by accelerating the pulp layer with the added soft magnetic fibers; thus the fibers are also oriented in the longitudinal direction of the material path.

The security element for electronic security of goods produced according to the invention has the following properties: the first layer is a cellulosic mass consisting of cellulosic fibers. The second layer also consists of a cellulosic mass consisting of mixtures of cellulosic fibers

And magnetically soft elements. These magnetically soft elements are excited to emit a characteristic signal in the magnetic interrogation field of the electronic goods securing device.

As already described in connection with the method of the invention, the magnetic elements are fibers of a soft magnetic material. In view of the highest detection values, it has proven advantageous if the length of the magnetically soft fibers is greater than 2 cm in diameter.

Another advantageous aspect of the security element of the present invention is that the cellulosic mass of the second layer comprises at most half the amount of soft-soft fibers than the cellulosic fibers. In particular, the superimposition of two layers of cellulosic material according to the invention allows the concentration of cellulosic fibers contained in the layer of magnetically soft fibers to be very low without losing stability. Due to the extremely dilute fibrous suspension for the second layer, this preferred embodiment of the securing element allows: a) good mixing of relatively long magnetic fibers with the cellulosic mass, b) good dispersion of the magnetic fibers without excessively curving the fibers, c) easy orientation of the magnetic fibers under external forces if necessary.

Overview of the drawings

The invention is explained in more detail in the following figures. Fig. 1 is a schematic representation of the device by which the method of the invention is carried out; and Fig. 2 is a perspective view of a locking element made by the method of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Through the feed device 8, the cellulosic mass 6 is applied to the storage surface 10. For example, the storage surface 10 is a continuous mesh with fine meshes which is guided by guide rollers 14, 15. The meshes of the net forming the storage surface 10 can be removed from the cellulosic mass 6 water.

By means of a further feeding device 7, a second cellulosic mass 5 is applied to the second surface 9. This receiving surface 9 can again be an endless mesh with fine meshes, which is guided by guide rollers 11.12. 16. Under the guide roller 16, the second layer 3 of the second cellulosic mass 5 is still wet on the first layer 2 of the cellulosic mass 6. In the figure, the direction of travel of the material web consisting of the layers 2,3 is indicated by an arrow in the figure.

While the cellulosic mass 6 of the first layer 2 consists solely of cellulosic fibers, the magnetically soft elements 4 in the form of magnetically soft fibers are admixed to the second cellulosic mass 5 of the second layer 3. The ratio of the mixture is at most 50:50. Above the second layer 3, which contains the magnetically soft elements 4, the guide roller 14 is formed as a device which generates a magnetic field in the material path direction of the first and second layers 2, 3. As previously described, the second cellulosic mass 5 of the second layer 3 only has a diluted concentration of cellulosic fibers. If the wet second layer 3 is now guided below the guide roller 14, the soft-soft fibers have sufficient freedom of movement to orient themselves in the direction of the magnetic field. By this forced rectification of the magnetically soft elements 4, at a predetermined concentration thereof, the detection probability of the locking elements made of the material strip of the first and second layers 2, 3 can be greatly increased.

As already mentioned, the rectification of the magnetically soft elements 4 in the form of magnetically soft fibers can be forced by mechanical action on the still wet cellulosic mass containing the magnetically soft fibers. For example, the force component is allowed to act in the web direction of the web of the first and second layers 3 simply by accelerating the web in the direction of travel.

-2GB 288045 B6

The security element 1 comprises a first layer 2, which is a cellulosic mass 6, which is composed of cellulosic fibers without further admixtures. The second layer 3 consists of a mixture of cellulosic mass 5, to which magnetically soft elements 4 are added. The length of the magnetically soft fibers 5 is calculated such that the magnetically soft elements 4 in the electronic goods security device are highly likely to be excited to emit a characteristic signal. alarm has been triggered.

The soft-magnetic elements 4 in the form of soft-soft fibers are substantially oriented in one direction in accordance with a further aspect of the security elements 1 according to the invention. This brings the advantage that even with a small number of fibers in one locking element 1, the characteristic signal of the locking element can be detected without problems in the goods securing device.

In summary, the advantages of the security elements 1 produced by the method according to the invention will be mentioned again. Since two-ply paper is used for the manufacture of the security elements 1, it is possible to maintain a low concentration of cellulosic fibers in the layer 3 containing the soft magnetic elements 4. The concentration of the soft magnetic elements 4 can therefore also be negligible. held correspondingly low. A further advantage lies in the tear strength of the bilayer web of the first 20 and second layers 2, 3. The second layer 3 with substantially longitudinally arranged magnetically soft elements 4 exhibits anisotropic tear strength. Particularly in the direction of soft-soft fibers, the tear strength is very low. However, since the cellulose fibers in the first layer 2 are arbitrarily arranged, the material web of the first and second layers 2, 3 as such exhibits a predominantly isotropic tear strength. Furthermore, very long fibers can be used and the fibers remain approximately stretched during the manufacturing process.

Claims (8)

PATENT CLAIMS A method of manufacturing security elements for the electronic security of goods, wherein the security elements are made of at least two layers, characterized in that 35 a layer (3) of cellulosic mass (5) is applied by a first layer (2) of cellulosic mass (6), which is still in a wet state, with each of the layers (2, 3) adding magnetically soft elements (4) which In the field of the electronic goods security device, a characteristic signal is emitted, whereupon the securing elements (1) of the desired shape are cut or cut from the two layers (2, 3) in the dried state. Method according to claim 1, characterized in that the magnetically soft elements (4) in the wet cellulosic mass (5 or 6) are directed substantially in the longitudinal direction of the web material of the first and second layers (2) by applying an external force. 3). Method according to claim 2, characterized in that the soft-magnetic elements (4) in the wet cellulosic mass (5 or 6) are directed substantially in the longitudinal direction of the web of material of the first and second layers (2,3) by magnetic field . A security device for electronic security of goods made by the method according to claim 1, 50, characterized in that the first layer (2) is a cellulosic mass (6) consisting of cellulose fibers and that the second layer (3) is a cellulosic mass (5). Consisting of cellulosic fibers containing magnetically soft elements (4), which in the interrogation field of the electronic goods security device are excited to emit a characteristic signal. -3GB 288045 B6 The security element according to claim 4, characterized in that the magnetically soft elements (4) are fibers of a magnetically soft material. A security element according to claim 5, characterized in that the fiber length of the magnetic elements of the soft elements (4) exceeds 2 cm in diameter. Security element according to claim 4, characterized in that the cellulosic mass (5) of the second layer (3) contains at most half the amount of fibers of the magnetically soft elements (4) than the amount of cellulosic fibers. Security element according to claim 4, characterized in that the cellulosic mass (5) for producing the second layer (3) has a lower concentration of cellulosic fibers than the cellulosic mass (6) of the first layer (2).