DE102020000786B4 - Procedure for checking the authenticity of information about the origin of textile products - Google Patents

Abstract

Method for checking the authenticity of the origin information of textile products, characterized in that a) an optical detection of the marking printed on the surface of the textile surface and / or applied by embossing is carried out and the respective ones are caused by high speeds and / or embossing or printing errors during Errors occurring during the printing process are recorded as a first unique feature of the marking, b) a second unique feature of the marking is recorded by the textile support structure (4) of the variable background of the textile surface, which is recorded in parallel, c) after the digitization of the combined unique values a "fingerprint" of the respective recorded marking is determined through mathematical determination, d) a transformation of the mathematically determined "fingerprint" is carried out into a hash value and the value is stored in a database or blockchain, e) linking the "fingerprint" and the hash value with further information such as production data that can be assigned to the markings are linked and stored andf) during the inspection, the optical detection of the marking and/or the marking including edge areas is carried out using a mobile device and the recorded mathematical “fingerprint” is determined,g) a transformation of the with The information recorded on the mobile device is converted into a hash value using the same hash function as when transforming the “fingerprint”, textile product is signaled andj) when an identity is established, the other stored values assigned to the markings are retrieved and signaled by the mobile device.

Description

The invention relates to a method for checking the authenticity of the origin information of textile products by checking printed markings applied to the surface of the textile surfaces (preferably woven, knitted, knitted, braided, non-woven). These markings are preferably applied using digital printing, screen printing, gravure printing, offset printing, transfer printing, sublimation printing or by embossed surface (using carrier film, e.g. gold or silver foil, or similar).

It is known after the EP 1 882 059 B1 a process with which any number of functional elements can be enclosed between the filaments of a yarn. The filaments enclose the respective functional element and form a capsule around it. The functional element itself is sealed by a resin. In addition, it can be seen from the description that at least one yarn filament surrounding the functional element can be electrically conductive. A metal core filament and a filament that has copper are explicitly mentioned. A possible electrical connection between the functional element and the yarn filament is also mentioned. The functional element itself can be a silicon chip, ferromagnetic polymer chip or a phase change chip. However, the disadvantage of this process is the high level of material and manufacturing effort.

Yarn-based plagiarism protection through sequence functionalization represents further approaches to proving the authenticity of textiles (FINCKH, V., J. SCHMIDT, K. SCHARPF, C. RIETHMÜLLER, A. DINKELMANN, H. FINCKH and G.T. GRESSER. Yarn-based plagiarism protection through sequence functionalization. melliand Textile reports, 2017, (3), 151-153). The disadvantage of this method is that it is difficult to read with a mobile device.

From the publication DE 950 784 B an arrangement for attaching name or quality markings to the fabric strips of textiles of any kind is known, in which groups of needles that engage in the fabric strips and correspond to the markings are provided. However, this variant can be easily imitated and is therefore not a reliable guarantee of authenticity.

The object of the invention is to create a control method involving less effort for checking the authenticity of the origin information of textile products, with which unique changes in characteristics of the applied origin markings are recorded, evaluated and signaled for the purpose of identification.

This task is solved with the created method in accordance with the descriptive features according to patent claim 1. Advantageous developments of the method describe the features of patent claims 2 to 10.

With the method according to the invention, a flat print defined in its contour on a textile surface is checked for originality. Various printing processes such as screen printing, offset printing, transfer printing, sublimation printing, digital printing or embossing processes are usually used for printing. Due to the textile support structure and the undulation of the textile yarns, defects occur in the edge areas of the print or embossing. The cause of these defects lies in the imperfect adhesion of the ink, dye carrier materials or embossing material to the yarns or yarn filaments of the textile printing material. These random and unique defects are recorded and digitized as the first security feature after the imprint/embossing has been applied. For example, a digital camera installed inline or a similar recording element (IR camera or laser system) can be used for this purpose. Based on the deviations between the original template of the contour of the flat print and the contour actually created on the textile printing material, a unique digital fingerprint of the respective print/embossing is created.

The application of the print/embossing is also subject to fluctuation, as the repeat of the textile binding is usually not a multiple of the dimension of the contour. This in combination with the imperfections in the print/embossing means that the real contour is always positioned in different (slightly different) places on the textile binding. The edge area of the textile binding around the contour (for example at a distance of 5 cm) can therefore serve as a second unique security feature.

The digital fingerprint of an imprint/embossing on a textile printing material can therefore be created either from the system-related defects or from the positioning in relation to the textile binding or from a combination of both features.

This digital fingerprint can be determined, for example, based on the distances between the defects and/or features in the textile binding in the edge areas and at least one defined point of the marking (content of the contour) (e.g. center of the surface or other reference point). The marking preferably has at least 3 reference points, which are used to scale the recordings and to scale the Distances serve. By transforming the features into standardized distances to the reference points, a digital fingerprint is created based on distances in a numerical code. This number code can be in any number format.

The transformation of the digital fingerprint into a numerical code based on standardized distances is advantageous because distortions of the textile printing material induced by environmental influences can be subsequently eliminated in the later end user environment. The causes of such distortions of the textile printing material can be environmental influences such as temperature, humidity, UV radiation, etc. These environmental influences lead to a change in the yarn length or the yarn cross-section, e.g. B. based on thermal expansion, swelling effect, aging or similar. The change in the yarn length or the yarn cross section in turn results in a distortion of the textile printing material, which is anisotropic depending on the textile binding.

To later compensate for this distortion, experimental parameters are determined for corresponding climatic conditions and are stored in a database. This database is later used to correct the digital fingerprints determined by the end user.

After the digital fingerprint has been determined as part of the production process, it is stored in a database (central or decentralized) either unencrypted or encrypted (symmetrically or asymmetrically). Asymmetric encryption based on at least one hash function is preferably used. This means that each marking receives a unique original digital fingerprint and this in turn receives a unique entry in a central or decentralized database (e.g. blockchain). This entry in the database is used as proof of authenticity.

To check the authenticity of corresponding markings, they are digitized again by the end user. Various computer-based devices such as mobile phones with digital cameras, smart watches or new types of smart glasses or similar products can be used for this purpose. It is important that these devices have a unit for digitizing the marking, for example using a camera (optical, IR or UV), a laser unit or similar.

1. a) In einem Programm auf dem mobilen computerbasierten Gerät der unikale digitale Fingerabdruck errechnet und mit dem Eintrag in der Datenbank verglichen.
2. b) An einen Server zur Berechnung des digitalen Fingerabdruckes und zum Abgleich des Eintrages mit der Datenbank gesendet.

To authenticate the marking, the end user takes a photo of it with the digital camera of the computer-based device. In addition to the marking, the edge area of the marking can also be digitized, provided that the second unique factor of the textile binding is used for authentication. This photo will then

1. a) The unique digital fingerprint is calculated in a program on the mobile computer-based device and compared with the entry in the database.
2. b) Sent to a server to calculate the digital fingerprint and compare the entry with the database.

The photo can be taken either by a third-party application (app) installed on the computer-based device or by using the Kamara application available in the device's operating system.

In the case of symmetric encryption, the digital fingerprint is e.g. B. encrypted using 64bit, 128bit, 256bit keys, AES encryption or at least a hash function and stored in the database. The identical key is used both in the application on the computer-based device and when creating the marking in the production environment. When using symmetrical encryption, variant b) is preferably used, in which the photo taken by the end user is sent to a server for comparison with the entries in the database. This can ensure that the key can remain secret.

In the case of asymmetric encryption based on a 64bit, 128bit, 256bit key, AES encryption or at least a hash function, the same public key is used to encrypt the digital fingerprint as for entry into the database. If the encrypted digital fingerprint is to be decrypted, the private key, which is unknown to the general public, must be available. One advantage of asymmetric encryption is that encryption with the public key can take place directly in the end application on the mobile computer-based device. This means that only the distance-based numeric code needs to be transmitted to a server or database for authenticity verification. Alternatively, the comparison between the database and the mobile computer-based device can also take place directly in the device, so that the database only has to be retrieved.

In this way, no data is sent from the mobile computer-based device to a server or database.

This means that for all variants, only the encrypted information is compared in the database (central or decentralized, preferably blockchain) or in the end device, so that potential counterfeiters are not granted access to relevant data. If the digital fingerprint determined by recording the end user is identical to an entry in the database, the product is an original. This check is displayed to the customer on the device.

By linking to at least one other database, the customer can then receive additional information about the product, such as: B. Production date, time and place, materials and semi-finished products used, suppliers, supply chains, expiry dates, etc. are displayed.

If the comparison between the digital fingerprint sent and the database is negative, it is a forgery. This is displayed to the end user in the application on their computer-based device and they are asked to provide further information about the scanned product. This additional information can be the GPS data of the recording or information about the environment of the product origin (dealer or similar).

With the method according to the invention, the uniqueness is not generated solely by the errors in the printed image, but by combining the values from the error-containing printed image with the recorded values of the textile substrate.

• 1: die Auswahl von drei Referenzpunkten der Markierung,
• 2: die schematische Wiedergabe der textilen Trägerstruktur,
• 3: die Markierung mit vorhandenen Fehlstellen,
• 4: ausgewählte Erfassungspunkte für das Skalierungs-Netz und
• 5: die Markierung mit Begrenzung des äußeren Erfassungsbereiches.

The method will be explained in more detail below using an exemplary embodiment. Explanatory information is shown in the drawing

• 1 : the selection of three reference points of the marking,
• 2 : the schematic representation of the textile support structure,
• 3 : the marking with existing defects,
• 4 : selected capture points for the scaling network and
• 5 : the marking with limitation of the outer detection area.

The representation of the 1 shows a flat print with a defined contour on a textile surface. Various printing processes such as screen printing, offset printing, transfer printing, sublimation printing, digital printing or embossing processes can be used. For example, reference points 1, 2, 3 have been defined here for recording and comparing the printed marking with the marking on the original.

The schematic representation of the 2 shows the textile support structure 4 on which the marking is applied.

With the 3 The marking applied to the textile fabric is shown with defects 5, 6, 7. Due to the textile support structure 4 and the undulation of the yarns of the textile, defects 5, 6, 7 arise in the edge areas of the print or embossing. The reason for this Defects 5, 6, 7 are due to the imperfect adhesion of the ink, dye carrier materials or embossing material to the yarns or yarn filaments of the textile printing material. These random and unique defects 5, 6, 7 are recorded and digitized as the first security feature after the imprint/embossing has been applied. For example, a digital camera installed inline or a similar recording element (IR camera or laser system) can be used for this purpose. Based on the deviations between the original template of the contour of the flat print and the contour actually created on the textile printing material, a unique digital fingerprint of the respective print/embossing is created.

To determine a digital fingerprint of the marking, there is an in the 4 reproduced scaling network 8 for use. Using the predetermined detection points of the scaling network 6, the fingerprint is, for example, based on the distances between the defects and/or features in the textile binding in the edge areas, becoming at least one defined point of the marking (content of the contour) (e.g. center of the area or something else). reference point). The marking preferably has at least 3 reference points, which serve to scale the images and to scale the distances.

The schematic representation of the 5 shows the edge area of the marking to be recorded as defined by limitation 9. The application of the print/embossing is also subject to fluctuation, since the repeat of the textile binding is usually not a multiple of the dimension of the contour. This in combination with the imperfections in the print/embossing means that the real contour is always positioned in different (slightly different) places on the textile binding. The edge area of the textile binding around the contour (for example at a distance of 5 cm) can therefore serve as a second unique security feature.

Reference symbols

1

reference point

2

reference point

3

reference point

4

Textile support structure

5

Missing spot

6

Missing spot

7

Missing spot

8th

Scaling network

9

Limitation of the edge area

Claims (10)

Method for checking the authenticity of the origin information of textile products, characterized in that a) an optical detection of the marking printed on the surface of the textile surface and / or applied by embossing is carried out and the respective ones are caused by high speeds and / or embossing or printing errors Errors occurring during the printing process are recorded as a first unique feature of the marking, b) a second unique feature of the marking is recorded by the textile support structure (4) of the variable background of the textile surface, which is recorded in parallel, c) after the digitization of the combined unique features A "fingerprint" of the respective recorded marking is determined by mathematical determination, d) a transformation of the mathematically determined "fingerprint" is carried out into a hash value and the value is stored in a database or blockchain, e) linking the "fingerprint" and the hash value are linked and stored with further information such as production data that can be assigned to the markings and f) during the inspection, the optical detection of the marking and/or the marking including edge areas is carried out using a mobile device and the recorded mathematical “fingerprint” is determined, g) a transformation the information recorded with the mobile device is converted into a hash value using the same hash function as in the transformation of the "fingerprint", h) a comparison of both hash values is carried out to determine their identity, i) if there is no identity from the mobile device, the inauthenticity of the The origin of the textile product is signaled and j) if an identity is established, the other stored values assigned to the markings are retrieved and signaled by the mobile device. Procedure according to Patent claim 1 , characterized in that the values of an area of the textile products are recorded and digitized, which is up to 5 cm larger in any spatial direction than the printed and/or embossed surface and in the production process at process speeds of up to 50 m/min in one Distance of up to 20 cm takes place. Procedure according to Patent claim 1 , characterized in that the detection of characteristic features of the printed image is carried out by detecting the distances between the characteristic features and crossing points of the textile support structure (4) within the embossing and/or in the edge area around the marking, which is up to 5 cm in size. Procedure according to Patent claim 1 , characterized in that the values of the determined mathematical “fingerprints” are stored in decentralized databases of a blockchain. Procedure according to Patent claim 1 , characterized in that the storage of the values of the mathematical “fingerprint”, the hash value and the other production data assigned to the marking is linked to one another in at least one decentralized database and/or decentralized databases of a blockchain. Procedure according to Patent claim 1 , characterized in that the values of the mathematical “fingerprint”, the hash value and the other production data assigned to the marking are stored linked to one another in at least a second database. Procedure according to Patent claim 1 , characterized in that during the control by the mobile terminal by comparing proportional relationships, changes in the environmental conditions such as temperature and humidity and / or deformations caused by mechanical influences on the textile support structure (4) are recorded and a correction of the value to the unique parameters of the "Fingerprint" is carried out. Procedure according to the Patent claims 1 and 7 , characterized in that the value correction is carried out taking into account sensor data from the mobile device on the current temperature and humidity. Procedure according to Patent claim 1 , characterized in that the detection of the marking printed on the surface at predetermined detection points of a scaling net zes (6), the fingerprint of the marking being determined based on the distances between the defects and/or features of the textile support structure (4) within the edge regions (9) and at least one defined point of the marking. Procedure according to Patent claim 1 , characterized in that the recorded errors of the printed image are mathematically linked and evaluated with the recorded values of the textile substrate.

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