A method and analyzer for analyzing color saturation of high wear-resistant water-based decorative paper

Abstract

The present application relates to the field of color saturation analysis, and relates to a high-wear-resistance water-based decorative paper color saturation analysis method and analyzer. The present application carries out color zoning on the to-be-tested sample through the standard design drawing of the to-be-tested sample, selects multiple collection points, obtains the glossiness of each collection point through double-plane optical measurement, dynamically adjusts the light trap absorption area of the spectrophotometer, respectively collects the first reflection spectrum and the second reflection spectrum of each collection point, identifies the fluorescence interference wavelength point in combination with the system calibration deviation rate, determines the fluorescence decay coefficient in combination with the glossiness of the collection point, obtains the fluorescence correction reflectivity of each wavelength point, and thus obtains the color saturation. Based on the color saturation and the distribution position of each collection point, the saturation abnormal points are identified. Based on the effective fluorescence interference amount of the fluorescence characteristic band and the reference band, the fluorescence spectrum characteristics of each saturation abnormal point are analyzed, the abnormal reasons of the saturation abnormal points are analyzed, and the efficiency of production quality control is improved.

Description

Technical Field

[0001] This invention relates to the field of color saturation analysis, and specifically to a method and analyzer for analyzing the color saturation of highly abrasion-resistant water-based decorative paper. Background Technology

[0002] High-abrasion-resistant water-based decorative paper has become a mainstream choice in the building materials industry due to its environmentally friendly, abrasion-resistant, and scratch-resistant properties. Its color saturation, as an appearance quality indicator, determines the product's decorative effect and market acceptance. As the industry demands more refined and high-quality production of decorative paper, the market has set stringent standards for the color consistency and saturation stability of high-abrasion-resistant water-based decorative paper. Precise color saturation analysis has become an essential part of quality control during the production process.

[0003] However, existing technologies have the following problems: existing analysis methods mostly use single-directional optical measurement of gloss, without considering the gloss differences of decorative paper in different directions, and use fixed manual adjustment of the light trap absorption area, which has poor adaptability and low sensitivity to gloss, resulting in deviations in reflectance acquisition and affecting the saturation analysis results.

[0004] Meanwhile, existing technologies directly measure reflectance including fluorescence or directly measure reflectance after deducting the influence of fluorescence, without taking into account the accurate identification and correction of fluorescence interference in the full spectrum by combining gloss. This results in the calculated color saturation not matching the actual visual effect and failing to truly reflect the color quality of decorative paper.

[0005] Furthermore, existing technologies, after identifying abnormal color saturation, do not consider whether the cause is due to the pigment base color or an abnormality in the fluorescent whitening agent, based on measurement parameters. This results in a lack of precise adjustment direction for quality control at the production end, increasing production costs and product scrap rates. Summary of the Invention

[0006] This invention aims to address the shortcomings of existing technologies by providing a method and analyzer for analyzing the color saturation of highly abrasion-resistant water-based decorative paper. By dynamically adjusting the absorption area of ​​the spectrophotometer's light trap, it accurately identifies fluorescence interference wavelengths and combines gloss correction with reflectance to calculate true color saturation, thereby identifying anomalies, improving the accuracy of color saturation measurement results, and achieving precise attribution of anomalies.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: On the one hand, the present invention provides a method for analyzing the color saturation of high wear-resistant water-based decorative paper, including: dividing the sample to be tested into color zones based on the standard design drawings of the sample to be tested, selecting multiple collection points in each color zone, and obtaining the gloss of each collection point through dual-plane optical measurement.

[0008] The absorption area of ​​the spectrophotometer's optical trap is dynamically adjusted based on the gloss level at each collection point, and the first reflection spectrum under a full-spectrum light source and the second reflection spectrum without an ultraviolet light source are collected at each collection point.

[0009] The effective fluorescence interference amount is analyzed by combining the first and second reflection spectra of each wavelength point with the system calibration deviation rate. The fluorescence interference wavelength points are identified, and the fluorescence attenuation coefficient is determined by combining the gloss of the acquisition point to obtain the fluorescence corrected reflectance of each wavelength point.

[0010] The color saturation of each sampling point is obtained based on the fluorescence-corrected reflectance. Anomalies in saturation are identified by combining the distribution location of each sampling point. The fluorescence spectral characteristic ratio of each anomaly is analyzed based on the effective fluorescence interference amount of the fluorescence characteristic band and the reference band. The cause of the anomaly is analyzed based on the fluorescence spectral characteristic ratio.

[0011] On the other hand, the present invention provides a color saturation analyzer for high abrasion-resistant water-based decorative paper, including: a gloss measurement module, which divides the sample to be tested into color zones based on the standard design drawings of the sample to be tested, selects multiple collection points in each color zone, and obtains the gloss of each collection point through dual-plane optical measurement.

[0012] The absorption area adjustment module dynamically adjusts the absorption area of ​​the spectrophotometer's optical trap based on the gloss level at each collection point, and collects the first reflection spectrum under a full-spectrum light source and the second reflection spectrum under no ultraviolet light source at each collection point.

[0013] The reflectance correction module analyzes the effective fluorescence interference based on the first and second reflection spectra at each wavelength point, combined with the system calibration deviation rate, identifies the fluorescence interference wavelength points, and determines the fluorescence attenuation coefficient by combining the gloss of the acquisition point, thus obtaining the fluorescence-corrected reflectance at each wavelength point.

[0014] The anomaly identification module obtains the color saturation of each acquisition point based on the fluorescence-corrected reflectance, identifies saturation anomalies by combining the distribution location of each acquisition point, analyzes the fluorescence spectral characteristic ratio of each saturation anomaly point based on the effective fluorescence interference amount of the fluorescence characteristic band and the reference band, and analyzes the cause of the anomaly based on the fluorescence spectral characteristic ratio.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention divides the test sample into color zones based on the standard design drawings of the test sample, selects multiple collection points in each color zone, and obtains the gloss of each collection point through dual-plane optical measurement, so as to comprehensively and truly reflect the actual optical reflection characteristics of the decorative paper surface and avoid the distortion of gloss data caused by the one-sidedness of single-angle measurement.

[0016] (2) This invention dynamically adjusts the light trap absorption area of ​​the spectrophotometer based on the gloss of each collection point, and collects the first reflection spectrum under the full spectrum light source and the second reflection spectrum under the absence of ultraviolet light source at each collection point, thereby achieving smooth and high-precision adjustment of the light trap absorption area, effectively avoiding the problems of stray light reflection and detection signal distortion, and greatly improving the accuracy of reflectivity acquisition.

[0017] (3) This invention analyzes the effective fluorescence interference amount by combining the first and second reflection spectra of each wavelength point with the system calibration deviation rate, identifies the fluorescence interference wavelength points, and determines the fluorescence attenuation coefficient by combining the gloss of the collection point, thereby obtaining the fluorescence correction reflectance of each wavelength point, realizing targeted interference correction and improving the efficiency of detection and correction.

[0018] (4) The present invention obtains the color saturation of each collection point based on the fluorescence correction reflectance, identifies saturation anomalies by combining the distribution of each collection point, analyzes the fluorescence spectral characteristic ratio of each saturation anomaly based on the effective fluorescence interference of the fluorescence characteristic band and the reference band, and analyzes the abnormal causes of the saturation anomalies based on the fluorescence spectral characteristic ratio, thereby achieving accurate positioning of anomalies, enabling the quality control at the production end to accurately focus on the problem area and improve the efficiency of production quality control. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the method steps of the present invention.

[0021] Figure 2 This is a schematic diagram illustrating the specific steps involved in obtaining the absorption area of ​​the optical trap in this invention.

[0022] Figure 3 This is a schematic diagram of the steps for obtaining the fluorescence-corrected reflectance at each wavelength point in this invention.

[0023] Figure 4 This is a schematic diagram of the analyzer in this invention. Detailed Implementation

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. Furthermore, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0026] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0027] Please see Figure 1 As shown, the present invention provides a method for analyzing the color saturation of highly abrasion-resistant water-based decorative paper, including S1, obtaining the gloss of each sampling point.

[0028] Considering the differences in optical reflectance characteristics across different color areas of high-abrasion-resistant water-based decorative paper, and the susceptibility of gloss measurement from a single angle to the influence of surface coating texture and abrasion-resistant layer distribution, which can lead to random errors in gloss measurement at the sampling point, directly testing the entire sample or measuring gloss from a single angle would distort the underlying data for subsequent light trap adjustment and reflectance acquisition, thus affecting the accuracy of color saturation analysis results. Furthermore, arbitrarily selecting sampling points can result in uneven coverage of detection points and missed detection of key color areas, making it difficult to achieve precise color saturation detection.

[0029] Based on this, the specific implementation of step S1 is as follows: S11. Acquire an image of the surface of the sample to be tested. Based on the standard design drawing of the sample to be tested, perform color partitioning on the sample to be tested, and select multiple acquisition points in each color partition. The specific implementation steps are as follows: S111. The method for determining each acquisition point includes: extracting the standard design drawing of the sample to be tested from the high-abrasion-resistant water-based decorative paper production backend database, spatially registering the standard design drawing with the surface image of the sample to be tested, and obtaining the mapping relationship of each pixel. The standard design drawing refers to the standard design drawing area corresponding to the current surface image of the sample to be tested in terms of spatial layout, which contains the theoretical color values ​​and spatial layout information of each color area. Point pairing is performed according to the proportional relationship between the standard design drawing and the sample to be tested to obtain the color area of ​​the standard drawing corresponding to each pixel.

[0030] The high abrasion-resistant water-based decorative paper production background database described in this invention is used to store various basic parameters required for the operation of the color saturation analysis method and analyzer, in order to support quality control at the production end. These parameters include, but are not limited to, the standard design drawings of the sample to be tested, the system calibration deviation rate, the fluorescence attenuation coefficient at each gloss level, the specified color saturation threshold, and the fluorescence characteristic band range of the fluorescent whitening agent.

[0031] S112. Based on the mapping relationship, the theoretical color of each pixel of the sample to be tested is obtained, and adjacent pixels with the same theoretical color are divided into the same partition to obtain each color partition.

[0032] S113. Divide the high-abrasion-resistant water-based decorative paper sample into unit grids, and use the intersections of each grid within each color zone as the corresponding sampling points for that color zone. The unit grid division is performed with equal intervals, parallel to the width and length directions of the sample, using a preset grid step size. In this embodiment, the grid step size is set to 5% of the width of the decorative paper; however, the implementer can adjust and set other specific values ​​according to actual testing accuracy requirements.

[0033] It should also be noted that when there is no sampling point within a certain color partition, the geometric center of that color partition is used as the sampling point.

[0034] S12. Obtain the gloss of each sampling point through dual-plane optical measurement. The specific implementation steps include: S121. Establish a spatial rectangular coordinate system with the geometric midpoint of the sample surface as the origin, the X-axis parallel to the width direction of the sample, the Y-axis perpendicular to the width direction, and the Z-axis perpendicular to the paper surface.

[0035] S122. The plane parallel to the XZ plane and passing through a certain acquisition point is taken as the first incident light plane of the acquisition point, and the plane parallel to the YZ plane and passing through a certain acquisition point is taken as the second incident light plane of the acquisition point.

[0036] S123. Photometric measurements are performed sequentially on each sampling point at a preset incident angle on the first and second incident light planes to obtain the gloss of each incident light plane. The incident angle can be selected within the range of 45°-75°, and in this embodiment, the incident angle is set to 60°. The straight line passing through each sampling point and parallel to the Z-axis is the normal to each incident light plane, and the incident angle refers to the angle of 60° with the normal in the incident light plane.

[0037] S124. Calculate the relative gloss deviation between the two incident light planes, and obtain the objective correction coefficients for the two incident light planes based on the relative deviation.

[0038] The relative gloss deviation is the ratio of the absolute difference in gloss between the two incident light planes to the maximum value of the two gloss values. Furthermore, the specific rules for the objective correction coefficient are as follows: (1) When the gloss of the first incident light plane is greater than the gloss of the second incident light plane, , .

[0039] (2) When the gloss of the first incident light plane is less than the gloss of the second incident light plane, , .

[0040] in , These represent the objective correction coefficients for the first incident light plane and the second incident light plane, respectively. This represents the relative deviation in gloss.

[0041] S125. Calculate the gloss of each sampling point by multiplying the gloss of the two incident light planes by the corresponding objective correction coefficients, and then calculate the average value.

[0042] The specific formulas for calculating the gloss at each sampling point are as follows: .

[0043] in , These represent the gloss levels of the first and second incident light planes, respectively. This represents the gloss level of the sampling point.

[0044] pass The gloss levels of the first and second incident light planes are finely adjusted separately, summed, and then the average value is calculated by dividing the sum by 2. By using a correction coefficient, the influence of extreme values ​​is weakened, making the final gloss level more closely match the true visual gloss of the decorative paper.

[0045] This invention acquires images of the surface of the sample to be tested, divides the sample into color zones based on the standard design drawings of the sample, selects multiple acquisition points in each color zone, and obtains the gloss of each acquisition point through dual-plane optical measurement. This comprehensively and accurately reflects the actual optical reflection characteristics of the decorative paper surface, avoiding the distortion of gloss data caused by the one-sidedness of single-angle measurement.

[0046] S2. Collect the first and second reflectance of each collection point.

[0047] Considering that the fixed absorption area of ​​the spectrophotometer's optical trap cannot be adapted to the gloss differences at different collection points of high-abrasion-resistant water-based decorative paper, areas with different gloss levels will produce stray light reflections of varying degrees. A fixed optical trap is prone to causing distortion of the detection signal, resulting in deviations in reflectance collection. Furthermore, the addition of fluorescent whitening agents will cause the decorative paper to produce fluorescent reflections in the full spectrum. This reflection amount is superimposed on the substrate's natural color reflection amount. If the full spectrum and the reflection spectrum under no ultraviolet light source are not collected separately, the fluorescence reflection amount cannot be effectively separated, which will create obstacles for subsequent calculation of fluorescence interference and reflectance correction.

[0048] Based on this, the specific implementation steps of S2 are as follows: S21, dynamically adjust the light trap absorption area of ​​the spectrophotometer based on the gloss level of each collection point. For example... Figure 2 As shown, the specific implementation steps are as follows: S211, extract the gloss range corresponding to each absorption area level and the absorption area corresponding to each absorption area level from the high abrasion-resistant water-based decorative paper production backend database. It should be explained that existing spectrophotometers usually have multiple absorption area levels, each level corresponding to a fixed absorption area and associated with a certain gloss range.

[0049] S212. Based on the gloss level corresponding to each collection point and the gloss level corresponding to each absorption area level, match the corresponding absorption area level and its gloss level, and record the area corresponding to the absorption area level as the initial absorption area.

[0050] S213. The difference between the maximum and minimum gloss range values ​​corresponding to each sampling point is recorded as the gloss range width. The area difference between the absorption area level of each sampling point and the adjacent smaller absorption area level is calculated, and the ratio of this difference to the gloss range width is recorded as the adjustment coefficient. The adjustment coefficient represents the area change corresponding to a unit change in gloss.

[0051] S214. Obtain the absolute difference between the gloss level of each sampling point and the maximum value of the corresponding gloss level range, and multiply it by the corresponding adjustment coefficient as the adjustment area.

[0052] S215. The difference between the initial absorption area and the adjustment area at each acquisition point is taken as the absorption area of ​​the optical trap.

[0053] S22. Collect the first reflection spectrum under the full-spectrum light source and the second reflection spectrum under the absence of ultraviolet light source at each collection point, where the reflection spectrum refers to the reflected luminous flux corresponding to each spectrum.

[0054] This invention dynamically adjusts the absorption area of ​​the spectrophotometer's optical trap based on the gloss at each acquisition point, and collects the first reflection spectrum under a full-spectrum light source and the second reflection spectrum under no ultraviolet light source at each acquisition point. This achieves smooth and high-precision adjustment of the optical trap's absorption area, effectively avoiding stray light reflection and detection signal distortion, and significantly improving the accuracy of reflectivity acquisition.

[0055] S3. Analyze the effective fluorescence interference amount, identify the fluorescence interference wavelength points, and determine the fluorescence attenuation coefficient by combining the gloss of the collection point, so as to obtain the fluorescence corrected reflectance at each wavelength point.

[0056] Considering that directly using uncorrected reflectance to calculate color saturation would include spurious reflectance caused by fluorescence interference in the substrate's intrinsic reflectance, the calculated saturation would not match the actual visual effect. Furthermore, the degree of fluorescence interference varies across different wavelengths; indiscriminate correction would reduce detection efficiency. Additionally, gloss affects fluorescence attenuation; ignoring the coupling relationship between gloss and fluorescence attenuation and simply subtracting fluorescence interference would not achieve accurate reflectance correction, still resulting in saturation analysis bias. Moreover, system calibration bias exists during the detection process; failure to eliminate this noise would distort the calculation of fluorescence interference, affecting the accurate identification of fluorescence interference wavelengths.

[0057] Based on this, such as Figure 3 As shown, the method for obtaining the fluorescence corrected reflectance at each wavelength point includes: W1, obtaining the first reflectance and the second reflectance at each wavelength point based on the first reflectance spectrum and the second reflectance spectrum, and recording the difference between the first reflectance and the second reflectance as the initial fluorescence interference amount at the corresponding wavelength point.

[0058] The interval between the wavelength points is 5 nm, that is, the spectrophotometer uses a spectral step of 5 nm to collect the reflected light flux of each wavelength point in the visible light range of 380 nm to 780 nm.

[0059] Specifically, the methods for obtaining the first and second reflectivities are as follows: First, the spectrophotometer is calibrated using a standard white plate to obtain the original reflected luminous flux at each wavelength point. The ratios of the luminous flux at each wavelength point in the measured first and second reflective spectra to the original reflected luminous flux at the corresponding wavelength point on the standard white plate are used as the first and second reflectivities under the measurement conditions. The calibration method is as follows: the standard white plate is placed on the sample support stage, and the reflectance spectrum is collected using the same optical path and maximum light trap absorption area as the sample to be tested. The luminous flux at each wavelength point in the reflectance spectrum is recorded as the original reflected luminous flux. The standard white plate is a metrologically certified barium sulfate white plate or polytetrafluoroethylene white plate, whose reflectance in the full spectral range (380nm~780nm) is known and close to 100%.

[0060] W2. Extract the system calibration deviation rate from the high abrasion-resistant water-based decorative paper production backend database, obtain the difference between the initial fluorescence interference amount and the system calibration deviation rate at each wavelength point, and record it as the effective fluorescence interference amount.

[0061] The system calibration deviation rate represents the absolute difference between the actual measured reflected luminous flux at each wavelength point and the calibrated original reflected luminous flux after calibration with a standard white plate under UV-free detection conditions. When there is no fluorescence, the first reflectance should theoretically be the same as the second reflectance. Therefore, by measuring the second reflectance spectrum of the standard white plate under UV-free conditions, the luminous flux at each wavelength point is obtained, and the absolute difference between this difference and the original reflected luminous flux at the corresponding wavelength point is calculated. The ratio of this difference to the corresponding original reflected luminous flux is recorded as the system calibration deviation rate.

[0062] W3. Record the wavelength points where the effective fluorescence interference is not zero as fluorescence interference wavelength points.

[0063] W4. If a wavelength point at a certain acquisition point is a fluorescence interference wavelength point, match the corresponding fluorescence attenuation coefficient from the fluorescence attenuation coefficients of each wavelength point under different gloss levels according to the wavelength point and the gloss of the acquisition point, calculate the product of the effective fluorescence interference amount and the corresponding fluorescence attenuation coefficient, and sum it with the second reflectance as the fluorescence corrected reflectance.

[0064] The fluorescence attenuation coefficient is the effective correction ratio of the fluorescence interference amount, and its value ranges from 0 to 1. It represents the effective fluorescence reflection ratio after deducting invalid fluorescence interference. Therefore, by adding the product of the effective fluorescence interference amount and the fluorescence attenuation coefficient to the second reflectance, the fluorescence correction reflectance that fits the actual visual effect can be obtained.

[0065] The method for obtaining the fluorescence attenuation coefficient includes: first, obtaining a standard fluorescent plate with different gloss levels for which the standard fluorescence interference amount at each wavelength point is known, measuring the first reflectance and second reflectance at each wavelength point, and calculating the measured effective fluorescence interference amount at each wavelength point in combination with the system calibration deviation rate.

[0066] Then, the ratio of the standard fluorescence interference to the measured effective fluorescence interference of each standard fluorescent plate is recorded as the fluorescence attenuation coefficient at the corresponding wavelength point.

[0067] Finally, the average fluorescence attenuation coefficients at different wavelengths under different gloss levels were statistically analyzed and stored in the high abrasion-resistant water-based decorative paper production backend database.

[0068] W5. If a wavelength point is not a fluorescence interference wavelength point, its second reflectance is recorded as the fluorescence corrected reflectance. Since the system calibration deviation rate has been uniformly deducted in the effective fluorescence interference calculation stage, the second reflectance at this time is the true base color reflectance of the substrate after eliminating system errors.

[0069] This invention calculates the effective fluorescence interference amount based on the first and second reflection spectra of each wavelength point, identifies the fluorescence interference wavelength points, and corrects the reflectance of each fluorescence interference wavelength point by combining the fluorescence attenuation coefficient determined by gloss, thus obtaining the fluorescence corrected reflectance of each wavelength point. This achieves targeted interference correction and improves the efficiency of detection and correction.

[0070] S4. Analyze the fluorescence spectral characteristic ratio of each saturation anomaly point to determine the cause of the anomaly.

[0071] Considering that simply calculating color saturation cannot meet the actual needs of quality control in production, it is necessary to accurately locate the specific points of saturation abnormality during the production process and identify the core cause of the abnormality in order to make targeted adjustments to the production process and solve quality problems. Moreover, saturation abnormality may be caused by quality defects in the base color itself, or by abnormal parameters of fluorescent whitening agent or excessive fluorescence interference. If the two types of abnormal causes cannot be distinguished, it will lead to deviations in the direction of production adjustments, increase rework rate, and reduce production efficiency.

[0072] The specific implementation steps of S4 include: S41, obtaining the color saturation of each sampling point based on the fluorescence-corrected reflectance, and identifying saturation anomalies by combining the distribution location of each sampling point. The specific implementation steps include: S411, extracting the production-specified color saturation threshold from the high-abrasion-resistant water-based decorative paper production backend database, and recording each sampling point with a color saturation lower than the color saturation threshold as an absolute anomaly.

[0073] S412. Determine the color partition based on the distribution location of each absolute anomaly point, and obtain the color saturation of the remaining acquisition points within each color partition after removing the corresponding absolute anomaly point.

[0074] S413. Calculate the average and standard deviation of the color saturation of the remaining collection points. Determine the apparent color saturation range based on the average and the standard deviation by a set multiple. Record collection points whose color saturation is outside the corresponding apparent color saturation range as relative outliers. In this embodiment, the sum of the average and three times the standard deviation is set as the maximum value of the apparent color saturation range, and the difference between the average and the standard deviation is set as the minimum value of the apparent color saturation range, forming the apparent color saturation range, which can cover 99.73% of normal production fluctuations.

[0075] S414. Statistically identify the relative and absolute outliers of the sample to be tested, and collectively refer to them as saturation outliers.

[0076] The specific calculation process for obtaining the color saturation of each sampling point based on reflectivity is a well-known technique in the field, and will not be described in detail here.

[0077] S42. Analyze the fluorescence spectral characteristic ratio of each saturation anomaly point based on the effective fluorescence interference amount of the fluorescence characteristic band and reference band. The specific implementation steps are as follows: S421. Extract the characteristic emission band range of the fluorescent whitening agent and its adjacent reference band ranges from the database of high abrasion-resistant water-based decorative paper production. In this embodiment, the setting of the fluorescence characteristic band and reference band is for stilbene-based fluorescent whitening agents commonly used in high abrasion-resistant water-based decorative paper. The characteristic emission peak of this type of whitening agent is concentrated in 430nm-450nm, so the characteristic emission band range is set to 430nm-450nm, and the adjacent reference band ranges are 400nm-420nm and 460nm-480nm, respectively. If other types of fluorescent whitening agents are used, the characteristic emission band can be adjusted according to the fluorescence emission spectrum of the whitening agent, and the reference band is the visible light band 20nm on both sides of the characteristic emission band.

[0078] S422. Obtain the effective fluorescence interference amount corresponding to each wavelength point in the characteristic emission band range from the effective fluorescence interference amount corresponding to each wavelength point, and record the maximum effective fluorescence interference amount as the fluorescence interference peak value.

[0079] S423. Extract the effective fluorescence interference at each wavelength point in the reference band range on both sides, and calculate the reference fluorescence interference by averaging.

[0080] S424. Obtain the ratio of the fluorescence interference peak value to the reference fluorescence interference amount at each saturation anomaly point, and record it as the fluorescence spectral characteristic ratio.

[0081] S43. Analyze the causes of saturation anomalies based on fluorescence spectral characteristic ratios. The specific implementation steps include: S431. Collect the effective fluorescence interference at each wavelength point of standard high-abrasion-resistant water-based decorative paper and determine the acceptable range of fluorescence spectral characteristic ratios accordingly. The method for determining the acceptable range of fluorescence spectral characteristic ratios is as follows: Select at least 50 batches of acceptable high-abrasion-resistant water-based decorative paper samples, determine their fluorescence spectral characteristic ratios according to step S2, calculate the mean and standard deviation of this set of data, and set the range of fluorescence spectral characteristic ratios as the sum of the mean and twice the standard deviation, and the difference between the mean and twice the standard deviation.

[0082] S432. If the fluorescence spectral characteristic ratio of a certain saturation abnormality point is within the range of qualified fluorescence spectral characteristic ratio, then it is determined that its fluorescence parameters are not abnormal, and the saturation abnormality is caused by the abnormal background color.

[0083] S433. If the fluorescence spectral characteristic ratio of a certain saturation anomaly point is not within the range of qualified fluorescence spectral characteristic ratios, calculate its background color saturation based on the second reflectance.

[0084] S434. Based on the background color saturation and fluorescence spectral characteristic ratio of the saturation anomaly point, and combined with the anomaly judgment rules, analyze the cause of the saturation anomaly point.

[0085] It should be noted that the anomaly judgment rule is as follows: when the saturation of the background color at the saturation anomaly point is not within the specified range of the background color saturation of the standard high abrasion-resistant water-based decorative paper, the background color is judged to be abnormal.

[0086] When the fluorescence spectral characteristic ratio is greater than the maximum value of the qualified fluorescence spectral characteristic ratio range, the fluorescence parameter is judged to be abnormal. The reason may be that other types of fluorescent whitening agents have been mixed in, or that the uneven gloss distribution of the coating on the surface of the decorative paper causes spectral stray light interference.

[0087] When the fluorescence spectral characteristic ratio is less than the minimum value of the qualified fluorescence spectral characteristic ratio range, it is determined that the fluorescent whitening agent has decomposed or become ineffective.

[0088] This invention identifies saturation anomalies based on color saturation and analyzes the fluorescence interference index of each anomaly by combining fluorescence interference analysis. Based on the fluorescence interference index, the causes of the anomalies are analyzed, achieving precise location of the anomalies. This allows quality control at the production end to accurately focus on problem areas and improve the efficiency of production quality control.

[0089] like Figure 4 As shown, on the other hand, a high-wear-resistant water-based decorative paper color saturation analyzer is characterized by comprising: a gloss measurement module, which divides the sample to be tested into color zones based on the standard design drawings of the sample to be tested, selects multiple collection points in each color zone, and obtains the gloss of each collection point through dual-plane optical measurement.

[0090] The absorption area adjustment module dynamically adjusts the absorption area of ​​the spectrophotometer's optical trap based on the gloss level at each collection point, and collects the first reflection spectrum under a full-spectrum light source and the second reflection spectrum under no ultraviolet light source at each collection point.

[0091] The reflectance correction module analyzes the effective fluorescence interference based on the first and second reflection spectra at each wavelength point, combined with the system calibration deviation rate, identifies the fluorescence interference wavelength points, and determines the fluorescence attenuation coefficient by combining the gloss of the acquisition point, thus obtaining the fluorescence-corrected reflectance at each wavelength point.

[0092] The anomaly identification module obtains the color saturation of each acquisition point based on the fluorescence-corrected reflectance, identifies saturation anomalies by combining the distribution location of each acquisition point, analyzes the fluorescence spectral characteristic ratio of each saturation anomaly point based on the effective fluorescence interference amount of the fluorescence characteristic band and the reference band, and analyzes the cause of the anomaly based on the fluorescence spectral characteristic ratio.

[0093] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, in the form of a computer program product.

[0094] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0095] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0096] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0097] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for analyzing the color saturation of highly abrasion-resistant water-based decorative paper, characterized in that, include: Based on the standard design drawings of the sample to be tested, the sample to be tested is divided into color zones. Multiple sampling points are selected in each color zone, and the gloss of each sampling point is determined by dual-plane optical measurement combined with objective correction coefficients. Based on the gloss level of each collection point, the light trap absorption area of ​​the spectrophotometer is dynamically adjusted, and the first reflection spectrum under the full spectrum light source and the second reflection spectrum under the absence of ultraviolet light source are collected at each collection point respectively. The effective fluorescence interference amount is analyzed by combining the first and second reflection spectra of each wavelength point with the system calibration deviation rate, the fluorescence interference wavelength points are identified, and the fluorescence attenuation coefficient is determined by combining the gloss of the acquisition point to obtain the fluorescence corrected reflectance of each wavelength point. The color saturation of each sampling point is obtained based on the fluorescence-corrected reflectance. Anomalies in saturation are identified by combining the distribution location of each sampling point. The fluorescence spectral characteristic ratio of each anomaly is analyzed based on the effective fluorescence interference amount of the fluorescence characteristic band and the reference band. The cause of the anomaly is analyzed based on the fluorescence spectral characteristic ratio.

2. The method for analyzing the color saturation of high-abrasion-resistant water-based decorative paper according to claim 1, characterized in that, The method for determining each collection point includes: The standard design drawings of the test sample are extracted from the production back-end database of high abrasion-resistant water-based decorative paper. The standard design drawings are spatially registered with the surface image of the test sample to obtain the mapping relationship of each pixel. The theoretical color of each pixel in the sample to be tested is obtained based on the mapping relationship. Adjacent pixels with the same theoretical color are divided into the same partition to obtain each color partition. The high abrasion-resistant water-based decorative paper sample was divided into unit grids, and the intersection of each grid in each color zone was used as the sampling point of the corresponding color zone.

3. The method for analyzing the color saturation of high-abrasion-resistant water-based decorative paper according to claim 1, characterized in that, The method for measuring the gloss at each sampling point is as follows: A spatial rectangular coordinate system is established with the geometric midpoint of the sample surface as the origin, the X-axis parallel to the width direction of the sample, the Y-axis perpendicular to the width direction, and the Z-axis perpendicular to the paper surface. The plane parallel to the XZ plane and passing through a certain acquisition point is taken as the first incident light plane of the acquisition point, and the plane parallel to the YZ plane and passing through a certain acquisition point is taken as the second incident light plane of the acquisition point. The gloss and photometric measurements of each collection point are performed sequentially at a preset incident angle on the first incident light plane and the second incident light plane to obtain the gloss of each incident light plane. Calculate the relative gloss deviation between the two incident light planes, and obtain the objective correction coefficients for the two incident light planes based on the relative deviation. The gloss of each incident light plane is calculated by multiplying the gloss of the two incident light planes by the corresponding objective correction coefficients, and then averaging the results to obtain the gloss of each sampling point.

4. The method for analyzing the color saturation of high abrasion-resistant water-based decorative paper according to claim 1, characterized in that, The specific method for obtaining the absorption area of ​​the optical trap includes: Extract the gloss range and absorption area corresponding to each absorption area level from the production back-end database of high abrasion-resistant water-based decorative paper. Based on the gloss level corresponding to each collection point and the gloss level corresponding to each absorption area level, the corresponding absorption area level and its gloss level are matched, and the area corresponding to the absorption area level is recorded as the initial absorption area. The difference between the maximum and minimum gloss range corresponding to each sampling point is recorded as the gloss range width. The area difference between the absorption area level of each sampling point and the adjacent smaller absorption area level is calculated, and the ratio of this difference to the gloss range width is recorded as the adjustment coefficient. Obtain the absolute difference between the gloss level of each sampling point and the maximum value of the corresponding gloss level range, and multiply it by the corresponding adjustment coefficient to record the adjustment area; The difference between the initial absorption area and the adjusted area at each acquisition point is taken as the absorption area of ​​the optical trap.

5. The method for analyzing the color saturation of high abrasion-resistant water-based decorative paper according to claim 1, characterized in that, The method for obtaining the fluorescence-corrected reflectance at each wavelength point includes: The first reflectance and the second reflectance at each wavelength point are obtained based on the first reflectance spectrum and the second reflectance spectrum, and the difference between the first reflectance and the second reflectance is recorded as the initial fluorescence interference at the corresponding wavelength point. The system calibration deviation rate is extracted from the production background database of high abrasion-resistant water-based decorative paper. The difference between the initial fluorescence interference amount and the system calibration deviation rate at each wavelength point is obtained and recorded as the effective fluorescence interference amount. The wavelength points where the effective fluorescence interference is not zero are denoted as fluorescence interference wavelength points. If a certain wavelength point of a certain acquisition point is a fluorescence interference wavelength point, the corresponding fluorescence attenuation coefficient is matched from the fluorescence attenuation coefficients of each wavelength point under different gloss levels according to the wavelength point and the gloss of the acquisition point. The product of the effective fluorescence interference amount and the corresponding fluorescence attenuation coefficient is calculated, and the sum of it with the second reflectance is recorded as the fluorescence corrected reflectance. If a wavelength point is not a fluorescence interference wavelength point, its second reflectance is recorded as the fluorescence corrected reflectance.

6. The method for analyzing the color saturation of high-abrasion-resistant water-based decorative paper according to claim 5, characterized in that, The method for obtaining the fluorescence attenuation coefficient includes: Obtain standard fluorescent plates with different gloss levels for known standard fluorescence interference at each wavelength point, measure the first reflectance and second reflectance at each wavelength point, and calculate the measured effective fluorescence interference at each wavelength point in combination with the system calibration deviation rate. The ratio of the standard fluorescence interference to the measured effective fluorescence interference of each standard fluorescent plate is recorded as the fluorescence attenuation coefficient at the corresponding wavelength point. The average fluorescence attenuation coefficients at different wavelengths under different gloss levels were statistically analyzed and stored in the back-end database for the production of high abrasion-resistant water-based decorative paper.

7. The method for analyzing the color saturation of high abrasion-resistant water-based decorative paper according to claim 1, characterized in that, The method for identifying saturation anomalies includes: Extract the color saturation threshold specified for production from the production back-end database of high abrasion-resistant water-based decorative paper, and record each collection point with a color saturation lower than the color saturation threshold as an absolute outlier. Based on the distribution location of each absolute anomaly, determine the corresponding color partition and obtain the color saturation of the remaining sampling points in each color partition after removing the corresponding absolute anomaly. The average and standard deviation of color saturation of the remaining collection points are statistically analyzed. The apparent color saturation range is determined based on the average and the standard deviation of a set multiple. Collection points whose color saturation is not within the corresponding apparent color saturation range are recorded as relative outliers. The relative and absolute outliers of the sample under test are statistically analyzed and collectively referred to as saturation outliers.

8. The method for analyzing the color saturation of high abrasion-resistant water-based decorative paper according to claim 1, characterized in that, The analytical method for the fluorescence spectral characteristic ratio includes: Extract the fluorescence characteristic band range of the fluorescent whitening agent and the reference band range on both sides of it from the back-end database of high abrasion-resistant water-based decorative paper production. The effective fluorescence interference quantity corresponding to each wavelength point is obtained from the effective fluorescence interference quantity corresponding to each wavelength point, and the maximum value of the effective fluorescence interference quantity is recorded as the fluorescence interference peak value. The effective fluorescence interference at each wavelength point in the reference band range on both sides is extracted, and the reference fluorescence interference is calculated by averaging. The ratio of the fluorescence interference peak value to the reference fluorescence interference amount at each saturation anomaly point is obtained and recorded as the fluorescence spectral characteristic ratio.

9. The method for analyzing the color saturation of high abrasion-resistant water-based decorative paper according to claim 8, characterized in that, The method for analyzing the causes of the saturation anomalies includes: The effective fluorescence interference at each wavelength point of standard high abrasion-resistant water-based decorative paper was collected, and the range of qualified fluorescence spectral characteristic ratios was determined accordingly. If the fluorescence spectral characteristic ratio of a certain saturation abnormality point is within the range of qualified fluorescence spectral characteristic ratio, then it is determined that its fluorescence parameters are not abnormal, and the saturation abnormality is caused by the abnormal background color. If the fluorescence spectral characteristic ratio of a certain saturation anomaly point is not within the range of the qualified fluorescence spectral characteristic ratio, its background color saturation is calculated based on the second reflectance. The causes of the saturation anomalies were analyzed based on the ratio of background color saturation and fluorescence spectral characteristics of the anomaly points, combined with the anomaly judgment rules.

10. A color saturation analyzer for high abrasion-resistant water-based decorative paper, characterized in that, include: The gloss measurement module divides the sample into color zones based on the standard design drawings of the sample to be tested, selects multiple collection points in each color zone, and obtains the gloss of each collection point through dual-plane optical measurement. The absorption area adjustment module dynamically adjusts the absorption area of ​​the spectrophotometer's optical trap based on the gloss at each collection point, and collects the first reflection spectrum under a full-spectrum light source and the second reflection spectrum under no ultraviolet light source at each collection point. The reflectance correction module analyzes the effective fluorescence interference based on the first and second reflectance spectra at each wavelength point, combined with the system calibration deviation rate, identifies the fluorescence interference wavelength points, and determines the fluorescence attenuation coefficient by combining the gloss of the acquisition point, thus obtaining the fluorescence-corrected reflectance at each wavelength point. The anomaly identification module obtains the color saturation of each acquisition point based on the fluorescence-corrected reflectance, identifies saturation anomalies by combining the distribution location of each acquisition point, analyzes the fluorescence spectral characteristic ratio of each saturation anomaly point based on the effective fluorescence interference amount of the fluorescence characteristic band and the reference band, and analyzes the cause of the anomaly based on the fluorescence spectral characteristic ratio.

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