Paper sample authenticity identification and traceability method and system

Abstract

The invention provides a paper sample authenticity identification and traceability method and system. The invention provides a paper sample authenticity identification and traceability method. The method comprises the following steps: detecting a to-be-detected paper sample and a standard paper sample by adopting a real-time direct analysis mass spectrum; and determining the authenticity and the source of the to-be-detected paper sample according to the detection results of the to-be-detected paper sample and the standard paper sample. The method provided by the invention does not depend on experience of detection personnel, is relatively high in accuracy, can realize authentic identification and traceability of the to-be-detected paper sample without depending on printing ink marks and handwriting on the paper or adding a specific anti-counterfeiting substance into the paper in advance, and is relatively wide in application range.

Description

Technical Field

[0001] The invention relates to a method and system for identifying and tracing the authenticity of a paper sample, and relates to the technical field of judicial identification. Background Art

[0002] In the field of forensic science, it is necessary to analyze paper materials such as contracts, bills, and archives to determine the authenticity and source of paper materials. At present, the methods for authenticity judgment and traceability of paper materials mainly include the following: 1. Identify by visual means to observe whether the color, thickness, texture, and gloss of the paper sample to be tested are consistent with the standard, but this method mainly relies on the experience of the observer and is not very accurate. 2. Add specific substances to the process of paper manufacturing to perform authenticity identification and traceability. For example, a traceability agent carrying characteristic information or an RFID tag with a unique identifier (UID) and an electronic product code (EPC) is added during the paper manufacturing process. However, for paper that does not carry a traceability agent or label, it is impossible to authenticate and trace it. 3. Detect the ink on the surface of the paper sample to authenticate and trace the sample to be tested. However, the composition of the ink will be different due to the difference in writing strength and formation time. As the writing time changes, the composition of the ink changes greatly, and the paper document cannot be effectively authenticated and traced based on the ink composition. Summary of the invention

[0003] The present invention provides a paper sample authenticity identification and source tracing method, which is used for analyzing and detecting the authenticity and source of a paper sample.

[0004] The invention also provides a paper sample authenticity identification and source tracing system.

[0005] A first aspect of the present invention provides a method for authenticity identification and source tracing of a paper sample, comprising the following steps:

[0006] Real-time direct analysis mass spectrometry was used to detect the paper samples to be tested and the standard paper samples;

[0007] According to the test results of the paper sample to be tested and the standard paper sample, the authenticity and source of the paper sample to be tested are determined, wherein:

[0008] When the m / z of at least 8 of the top 10 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic;

[0009] When the m / z of at least 14 components in the top 20 components of the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

[0010] In a specific embodiment, when the m / z of the top 5 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is determined to be authentic.

[0011] In a specific embodiment, the method further comprises:

[0012] A paper standard sample database is established, wherein the paper standard sample database includes mass spectrum data of standard paper samples, wherein the mass spectrum data is obtained by detecting the standard paper samples using real-time direct analysis mass spectrometry.

[0013] In a specific embodiment, the same real-time direct analysis mass spectrometry method is used for the paper sample to be tested and the standard paper sample.

[0014] In a specific embodiment, the standard paper samples include standard paper samples made from hardwood pulp, standard paper samples made from softwood pulp, straw pulp and standard paper samples from other sources.

[0015] In a specific embodiment, the hardwood pulp standard paper sample includes a cedar standard paper sample, a fir standard paper sample, and a pine standard paper sample.

[0016] In a specific embodiment, the softwood pulp standard paper samples include eucalyptus standard paper samples, poplar standard paper samples, birch standard paper samples, and oak standard paper samples.

[0017] In a specific embodiment, the standard paper samples of straw pulp and other sources include standard paper samples of mulberry bark, standard paper samples of bamboo pulp, standard paper samples of reed, standard paper samples of straw, standard paper samples of flax, standard paper samples of reed pulp, and standard paper samples of bagasse pulp.

[0018] In a specific embodiment, the real-time direct analysis mass spectrometer is selected from a normal pressure open ion source, and the ion mode includes one of positive ions and negative ions.

[0019] A second aspect of the present invention provides a paper sample authenticity identification and traceability system, comprising:

[0020] The test unit uses real-time direct analysis mass spectrometry to test the paper sample to be tested and the standard paper sample;

[0021] An analysis unit compares and analyzes the test data of the paper sample to be tested and the test data of the standard paper sample obtained by the test unit to obtain the authenticity and source of the paper sample to be tested;

[0022] When the m / z of at least 8 of the top 10 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic;

[0023] When the m / z of at least 14 components in the top 20 components of the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

[0024] The present invention detects the paper sample to be tested and the standard paper sample by real-time direct mass spectrometry analysis, and analyzes the detection results to achieve authenticity identification and traceability of the paper sample to be tested. The method provided by the present invention does not rely on the experience of the detection personnel, has high accuracy, and does not rely on printed ink or handwriting on the paper or the need to add specific anti-counterfeiting substances to the paper in advance, so as to achieve authenticity identification and traceability of the paper sample to be tested, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of a flow chart of a method for authenticity identification and source tracing of paper samples provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a paper sample authenticity identification and traceability system provided by an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 100-test unit;

[0030] 200-Analysis Unit. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the field of forensic science, it is necessary to analyze paper materials such as contracts, bills, and archives to determine the authenticity and source of paper materials. At present, the methods for authenticity judgment and traceability of paper materials mainly include the following: 1. Identify by visual means to observe whether the color, thickness, texture, and gloss of the paper sample to be tested are consistent with the standard, but this method mainly relies on the experience of the observer and is not very accurate. 2. Add specific substances to the process of paper manufacturing to perform authenticity identification and traceability. For example, a traceability agent carrying characteristic information or an RFID tag with a unique identifier (UID) and an electronic product code (EPC) is added during the paper manufacturing process. However, for paper that does not carry a traceability agent or label, it is impossible to authenticate and trace it. 3. Detect the ink on the surface of the paper sample to authenticate and trace the sample to be tested. However, the composition of the ink will be different due to the difference in writing strength and formation time. As the writing time changes, the composition of the ink changes greatly, and the paper document cannot be effectively authenticated and traced based on the ink composition.

[0033] For example, physical inspection of paper refers to the inspection of the appearance and physical properties of paper using the naked eye or with the aid of simple equipment such as a magnifying glass, microscope, ruler, scale, etc., including inspection of color and transparency, appearance inspection, grain inspection, thickness inspection, fluorescence inspection, etc.

[0034] A Chinese invention patent application with publication number CN103835186A discloses an anti-counterfeiting calligraphy and painting paper, in which micro non-metallic particles are attached to the fibers of the drawing paper material, a traceability agent carrying characteristic information is added inside the particles, and the traceability agent is sealed inside the non-metallic particles.

[0035] A Chinese invention patent application with publication number CN102651074A discloses a method for identifying printed paper identity based on texture features. The method uses a projection method to obtain the blank area on the page margin of the scanned image of the printed document to be tested and divides it into image blocks of specified sizes. The surface texture structure of each image block is obtained through a preprocessing operation, and then a two-dimensional LogGabor filter group is constructed to perform a filtering operation on each image block to generate a specific coding vector. The Hamming distance between the feature coding vectors of the image blocks at the same position of the two paper images is calculated, and a threshold is set to measure the similarity between the feature codes. Finally, a voting judgment mechanism is used to verify the source and authenticity of the document to be tested.

[0036] In order to simplify the method for authenticity identification and tracing of paper samples, the first aspect of the present invention provides a method for authenticity identification and tracing of paper samples, comprising the following steps:

[0037] Real-time direct analysis mass spectrometry was used to detect the paper samples to be tested and the standard paper samples;

[0038] According to the test results of the paper sample to be tested and the standard paper sample, the authenticity and source of the paper sample to be tested are determined, wherein:

[0039] When the m / z of at least 8 of the top 10 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic;

[0040] When the m / z of at least 14 components in the top 20 components of the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

[0041] The present invention uses real-time direct analysis mass spectrometry to detect a paper sample to be tested and a standard paper sample, and performs authenticity identification and traceability on the paper sample according to the detection results. The real-time direct analysis mass spectrometry is an analysis technology that combines an open ion source with a mass spectrometer, which can obtain components contained in the paper sample and their mass-to-charge ratio (m / z) in real time, and accurately qualitatively distinguish the components in the paper through the differences and similarities in the m / z of each component in the paper sample to be tested and the standard paper sample, thereby realizing authenticity identification and traceability of the paper sample to be tested; in addition, the real-time direct analysis mass spectrometry can comprehensively analyze additives, fiber components, etc. in the paper sample, with a wide analysis range and high accuracy; in addition, the real-time direct analysis mass spectrometry has less loss on the paper sample to be tested, and is suitable for the detection of precious paper.

[0042] In a specific embodiment, Figure 1 A schematic diagram of a flow chart of a method for authenticity identification and source tracing of paper samples provided by an embodiment of the present invention, as shown in FIG. Figure 1 As shown, the method specifically comprises the following steps:

[0043] Step 1, using real-time direct analysis mass spectrometry to detect the paper sample to be tested and the standard paper sample;

[0044] The standard paper sample in the present invention can be a paper sample that has been determined to be authentic, or a paper sample with a determined source. The paper sample to be tested refers to a paper sample that needs to be authenticated and its source determined. The real-time direct analysis mass spectrometry is used to analyze and detect the two to obtain the analysis and detection results.

[0045] It is understandable that in order to facilitate comparative analysis of the mass spectrometry detection results of the test paper sample and the standard paper sample, the same real-time direct analysis mass spectrometry method needs to be used to analyze and detect both.

[0046] The analysis method of real-time direct analysis of mass spectrometry can be a conventional technical means in the art, for example, it can be selected from a normal pressure open ion source, and the ion mode includes one of positive ions and negative ions.

[0047] Step 2: Determine the authenticity and source of the paper sample to be tested based on the test results of the paper sample to be tested and the standard paper sample;

[0048] According to the analysis and detection results of the real-time direct analysis mass spectrometry, the top 10 components contained in the paper sample to be tested and the standard paper sample are determined by the peak area, and the m / z of the top 10 components in the paper sample to be tested and the standard paper sample are obtained. When the m / z of at least 8 components in the top 10 components in the paper sample to be tested are the same as the m / z of the standard paper sample, it indicates that the paper sample to be tested is authentic.

[0049] Furthermore, in order to improve the accuracy of authenticity identification, on the basis of the above judgment criteria, when the m / z of the top 5 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic.

[0050] The top 20 components in the paper sample to be tested and the standard paper sample are determined by peak area, and the m / z of the top 20 components in the paper sample to be tested and the standard paper sample are obtained. When the m / z of at least 14 components in the top 20 components in the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

[0051] In order to further improve the simplicity of the method provided by the present invention, the method further comprises:

[0052] A paper standard sample database is established, which includes mass spectrum data of standard paper samples. The mass spectrum data is obtained by testing the standard paper samples using real-time direct analysis mass spectrometry.

[0053] Specifically, the mass spectrometry data of existing standard paper samples can be collected and classified to establish a paper standard sample database. By comparing the mass spectrometry analysis of the paper sample to be tested with the mass spectrometry data in the database, the authenticity and source of the paper sample to be tested can be directly obtained.

[0054] The standard paper samples provided by the present invention include standard paper samples made from hardwood pulp, standard paper samples made from softwood pulp, and standard paper samples made from straw pulp and other sources.

[0055] Furthermore, the hardwood pulp standard paper samples include cypress standard paper samples, fir standard paper samples, and pine standard paper samples.

[0056] Furthermore, the softwood pulp standard paper samples include eucalyptus standard paper samples, poplar standard paper samples, birch standard paper samples, and oak standard paper samples.

[0057] Furthermore, the standard paper samples from straw pulp and other sources include standard paper samples from mulberry bark, standard paper samples from bamboo pulp, standard paper samples from reeds, standard paper samples from straw, standard paper samples from flax, standard paper samples from reed pulp, and standard paper samples from bagasse pulp.

[0058] A second aspect of the present invention provides a paper sample authenticity identification and traceability system, comprising:

[0059] The test unit uses real-time direct analysis mass spectrometry to test the paper sample to be tested and the standard paper sample;

[0060] An analysis unit compares and analyzes the test data of the paper sample to be tested and the test data of the standard paper sample obtained by the test unit to obtain the authenticity and source of the paper sample to be tested;

[0061] When the m / z of at least 8 of the top 10 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic;

[0062] When the m / z of at least 14 components in the top 20 components of the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

[0063] In a specific embodiment, Figure 2 A schematic diagram of the structure of a paper sample authenticity identification and traceability system provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the system includes a testing unit 100 and an analyzing unit 200, and the roles and functions thereof are as described in the first aspect of the present invention, and the present invention will not be elaborated in detail here.

[0064] The method provided by the present invention is described in detail below with reference to specific embodiments:

[0065] Embodiment 1:

[0066] This example uses real-time direct analysis mass spectrometry to detect 1# paper sample, and the detection results are shown in Table 1:

[0067] Table 1 Mass spectrometry results of 1# paper sample provided in Example 1

[0068] m / z Peak area 207.16 623.5719133 87.06 513.6159354 224.19 248.2733688 376.31 217.0823963 173.11 177.3268946 420.34 125.2639401 191.18 96.38270554 332.28 86.2493937 130.09 71.99410992 208.16 63.25860065 172.11 54.96053167 151.10 54.27306992 377.31 45.86129066 225.19 39.08443822 297.25 36.31772599 421.34 28.81340263 341.27 27.15482472 195.12 21.44357925 464.36 20.32099944 88.06 18.77704962

[0069] Example 2

[0070] This example uses real-time direct analysis mass spectrometry to detect 2# paper sample, and the test results are shown in Table 2:

[0071] Table 2 Mass spectrometry results of 2# paper sample provided in Example 2

[0072] m / z Peak area 87.06 550.8885 207.16 284.2756 86.06 165.2559 173.11 147.0228 376.31 141.2734 172.11 98.59441 191.18 92.92041 332.28 83.02166 224.19 79.73364 420.33 58.45751 297.24 32.53901 171.11 30.76622 377.31 29.81113 208.16 28.83175 151.10 28.73225 88.06 21.26543 225.19 21.25163 341.27 16.94183 130.09 16.23326 192.18 13.04645

[0073] Example 3

[0074] This example uses real-time direct analysis mass spectrometry to detect 3# paper sample, and the detection results are shown in Table 3:

[0075] Table 3 Mass spectrometry results of 2# paper sample provided in Example 3

[0076]

[0077]

[0078] According to Table 1-3, among the top 20 components listed in 1# paper sample and 2# paper sample, 17 components have the same m / z, while 421.34, 195.12, and 464.36 are different. Only 2 components of 3# paper sample have the same m / z. Therefore, 1# paper sample and 2# paper sample have the same source, while 3# paper sample has a different source, which is confirmed by the final traceability results.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying and tracing the authenticity of paper samples, characterized in that: The steps include: Real-time direct analysis mass spectrometry was used to detect the paper samples to be tested and the standard paper samples; According to the test results of the paper sample to be tested and the standard paper sample, the authenticity and source of the paper sample to be tested are determined, wherein: When the m / z of at least 8 of the top 10 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic; When the m / z of at least 14 components in the top 20 components of the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

2. The method according to claim 1, characterized in that When the m / z of the top five components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: A paper standard sample database is established, wherein the paper standard sample database includes mass spectrum data of standard paper samples, wherein the mass spectrum data is obtained by detecting the standard paper samples using real-time direct analysis mass spectrometry.

4. The method according to claim 1, characterized in that: The same real-time direct analysis mass spectrometry method was used for the test paper samples and standard paper samples.

5. The method according to claim 3, characterized in that: The standard paper samples include hardwood pulp standard paper samples, softwood pulp standard paper samples, straw pulp and other source standard paper samples.

6. The method according to claim 5, characterized in that The hardwood pulp standard paper samples include cedar standard paper samples, fir standard paper samples, and pine standard paper samples.

7. The method according to claim 5, characterized in that The softwood pulp standard paper samples include eucalyptus standard paper samples, poplar standard paper samples, birch standard paper samples, and oak standard paper samples.

8. The method according to claim 5, characterized in that The standard paper samples of straw pulp and other sources include standard paper samples of mulberry bark, standard paper samples of bamboo pulp, standard paper samples of reed, standard paper samples of straw, standard paper samples of flax, standard paper samples of reed pulp, and standard paper samples of bagasse pulp.

9. The method according to claim 1, characterized in that: The real-time direct analysis mass spectrometer is selected from a normal pressure open ion source, and the ion mode includes one of positive ions and negative ions.

10. A paper sample authenticity identification and traceability system, characterized in that: include: The test unit uses real-time direct analysis mass spectrometry to test the paper sample to be tested and the standard paper sample; An analysis unit compares and analyzes the test data of the paper sample to be tested and the test data of the standard paper sample obtained by the test unit to obtain the authenticity and source of the paper sample to be tested; When the m / z of at least 8 of the top 10 components in the paper sample to be tested is equal to the m / z of the corresponding components in the standard paper sample, the paper sample to be tested is judged to be authentic; When the m / z of at least 14 components in the top 20 components of the paper sample to be tested are equal to the m / z of the corresponding components in the standard paper sample, it is determined that the source of the paper sample to be tested is the same as that of the standard paper sample.

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