Defect visual inspection method for release agent for production of film paper

Abstract

The present application relates to the technical field of defect visual detection, and especially relates to a defect visual detection method for a release agent used in the production of adhesive film paper, wherein solvent samples under different sampling conditions are mixed with a fluorescent agent and then coated in several local areas of the adhesive film paper in sequence; an excitation light source is used for irradiation, and a characteristic quantization comparison result based on a brightness space distribution curve is used to determine whether there is a difference in the phase distribution state of the solvent samples; the phase aggregation characteristic category is determined according to the numerical comparison in the brightness value sequence; finally, the eligibility of the release agent solvent is determined based on the curve information, or the distribution position of the defective release agent solvent is determined based on the numerical fluctuation analysis result in the brightness value sequence. Furthermore, the phase distribution state of the release agent solvent is directly quantitatively compared and the defect area is accurately positioned through visual detection, the positioning accuracy of the quality defects of the release agent is improved, and the production quality stability of the adhesive film paper is improved.

Description

Technical Field

[0001] This invention relates to the field of defect visual inspection technology, and more particularly to a defect visual inspection method for release agents used in the production of adhesive paper. Background Technology

[0002] In the production of adhesive film paper, the uniformity and phase stability of the release agent directly determine the peeling performance, surface quality, and production continuity of the adhesive film paper. Single-point sampling or discontinuous testing is difficult to cover the solvent state at different heights and in different areas within the release agent storage container. Furthermore, during the standing or transportation process, the release agent is prone to stratification, phase separation, or local polymerization due to differences in component density. Single-point data cannot reflect the overall uniformity of phase distribution, and potential quality risks are easily missed. Existing visual inspection methods are mostly aimed at surface defects of finished adhesive film paper, lacking direct and accurate detection methods for the phase distribution state of the release agent solvent itself. It is difficult to achieve preventive control before defects occur, resulting in a high scrap rate and limited production efficiency during the production process.

[0003] For example, Chinese Patent Publication No. CN119666869A discloses a coating defect detection method, electronic device, and storage medium. The method includes: uniformly mixing fluorescent powder into coating powder, and then fusing the mixed powder onto a substrate surface to form a coating to be tested; performing point-by-point detection on the coating to be tested to obtain the measured fluorescence spectrum corresponding to each detection point; determining whether each detection point is a defect point and the defect type based on the measured fluorescence spectrum and a preset standard fluorescence spectrum; if the defect type is an apparent quality defect, determining the coating quality loss value corresponding to the defect point, and repairing the defect point based on the coating quality loss value.

[0004] The following problems still exist in the existing technology:

[0005] Existing technologies cannot quantitatively perceive the differences in phase distribution in the vertical direction, and cannot directly quantify and compare the phase distribution of the release agent solvent through visual inspection and accurately locate defect areas. This results in inaccurate judgment of quality defects in the release agent and difficulty in locating defects, affecting the stability of the production quality of adhesive film paper. Summary of the Invention

[0006] To address this, the present invention provides a visual inspection method for defects in release agents used in the production of adhesive film paper, thereby overcoming the problem that existing technologies cannot quantitatively perceive phase distribution differences in the vertical direction, cannot directly quantify and compare the solvent phase distribution state of the release agent through visual inspection, and cannot accurately locate defect areas, resulting in inaccurate judgment of quality defects in the release agent and difficulty in defect location, which affects the stability of adhesive film paper production quality.

[0007] To achieve the above objectives, the present invention provides a method for visual inspection of defects in release agents used in the production of adhesive film paper, comprising:

[0008] Solvent samples of the release agent under different sampling conditions were obtained. The solvent samples under different sampling conditions were mixed with the same dose of fluorescent agent and then coated sequentially on several local areas of the adhesive film.

[0009] Each local area is coated with a solvent sample under a sampling condition, and there is an overlapping coating area between any two local areas.

[0010] The overlapping coated areas and the non-overlapping coated areas in each local area are irradiated using an excitation light source. Based on the obtained regional fluorescence brightness values, a first brightness spatial distribution curve and a second brightness spatial distribution curve are constructed. Based on the feature quantization comparison results of the two brightness spatial distribution curves, it is determined whether there is a difference in the phase distribution state of the solvent sample.

[0011] In response to the determination result that there is a difference in phase distribution state, a brightness value series composed of fluorescence brightness values ​​of several overlapping coating areas is determined, and the phase polymerization characteristic category of the solvent sample is determined based on the numerical comparison within the brightness value series;

[0012] The qualification of the release agent solvent is determined by selecting the curve information based on the first brightness spatial distribution curve according to the phase polymerization characteristic category, or by determining the distribution location of the defective release agent solvent based on the numerical fluctuation analysis results within the brightness value series.

[0013] Furthermore, the process of coating the solvent sample onto the adhesive film paper includes:

[0014] The adhesive film is divided into several local regions along its length, with the center-to-center distance between adjacent local regions being equal.

[0015] Several solvent samples were determined based on the differences in sampling conditions, wherein the sampling conditions were the sampling height of the release agent solvent;

[0016] Solvent samples with sampling heights from high to low are applied sequentially to local areas along the length of the adhesive film.

[0017] Furthermore, the process of constructing the first luminance spatial distribution curve and the second luminance spatial distribution curve includes:

[0018] Establish a rectangular coordinate system with fluorescence brightness value as the vertical axis and film length as the horizontal axis;

[0019] Obtain the regional fluorescence brightness value of each overlapping coated area and the length value of the regional center of each overlapping coated area in the length direction of the adhesive film paper to determine a number of data points of a certain type. The curve formed by connecting the data points of a certain type in sequence is determined as the first brightness spatial distribution curve.

[0020] The fluorescence brightness value of each non-overlapping coated area and the length value of the center of each non-overlapping coated area along the length of the film paper are obtained to determine several types of data points. The curve formed by connecting the two types of data points in sequence is determined as the second brightness spatial distribution curve.

[0021] Furthermore, the process of performing feature quantization comparison on the two brightness spatial distribution curves includes:

[0022] The area enclosed by the first luminance spatial distribution curve and the horizontal axis is defined as the first luminance quantization characteristic, and the area enclosed by the second luminance spatial distribution curve and the horizontal axis is defined as the second luminance quantization characteristic.

[0023] Calculate the ratio of the first luminance quantization measure to the second luminance quantization measure.

[0024] Furthermore, the process of determining whether there are differences in the phase distribution states of the solvent samples includes:

[0025] The ratio is compared with a preset ratio reference range;

[0026] If the ratio is not within the reference range, it is determined that there is a difference in the phase distribution state of the solvent sample.

[0027] Furthermore, the process of determining the sequence of brightness values ​​includes:

[0028] Sort the length values ​​of the center of each overlapping coated area along the length of the film paper from smallest to largest;

[0029] The fluorescence brightness values ​​of the corresponding overlapping coated areas are written into a sequence according to the length values ​​in ascending order to obtain the brightness value sequence.

[0030] Furthermore, the process of determining the phase polymerization characteristic category of the solvent sample based on the numerical comparison within the brightness value series includes:

[0031] If the brightness value sequence meets the numerical comparison screening conditions, then the solvent sample is determined to be the first characteristic category of phase polymerization;

[0032] If the brightness value sequence does not meet the numerical comparison screening conditions, the solvent sample is determined to be the second characteristic category of phase polymerization;

[0033] The numerical comparison and filtering condition is that the brightness value sequence is an increasing sequence.

[0034] Furthermore, a method for determining the pass / fail defects of the solvent sample is selected based on the aforementioned phase polymerization characteristic category, wherein,

[0035] If the solvent sample is of the first characteristic category of phase polymerization, then the qualification of the release agent solvent is determined by the curve information based on the first brightness spatial distribution curve.

[0036] If the solvent sample belongs to the second characteristic category of phase polymerization, the distribution location of the defective release agent solvent is determined based on the numerical fluctuation analysis results within the brightness value series.

[0037] Furthermore, the process of determining the qualification of the release agent solvent based on the curve information of the first brightness spatial distribution curve includes:

[0038] Determine the slope of the curve for several data points on the first brightness spatial distribution curve;

[0039] Compare the maximum slope of the curve with the preset reference slope value;

[0040] If the maximum value of the curve slope is greater than the reference value of the curve slope, the solvent of the release agent is deemed unqualified; if the maximum value of the curve slope is less than or equal to the reference value of the curve slope, the solvent of the release agent is deemed qualified.

[0041] Furthermore, the process of determining the distribution location of the defective release agent solvent includes:

[0042] Obtain the difference between two adjacent brightness values ​​within the brightness value sequence;

[0043] Determine the overlapping coating area to which the adjacent brightness values ​​corresponding to the difference value is greater than the preset difference reference value, and determine the sampling height of the solvent sample coated in the overlapping coating area to which the adjacent brightness values ​​belong;

[0044] Based on the sampling height, the defect area is determined, and the defect area is identified as the distribution location of the defective release agent solvent.

[0045] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention mixes solvent samples from different sampling conditions with the same dosage of fluorescent agent and then sequentially coats them onto several local areas of the adhesive film paper. An excitation light source is used to irradiate each overlapping coated area and the non-overlapping coated areas within each local area. Based on the obtained regional fluorescence brightness values, a first brightness spatial distribution curve and a second brightness spatial distribution curve are constructed. The phase distribution state of the solvent samples is determined based on the characteristic quantification comparison results of the two brightness spatial distribution curves. The phase polymerization characteristic category of the solvent samples is determined based on the numerical comparison within the brightness value series. Finally, the qualification of the release agent solvent is determined based on the curve information of the first brightness spatial distribution curve, or the distribution location of defective release agent solvents is determined based on the numerical fluctuation analysis results within the brightness value series. Furthermore, this invention achieves quantitative perception of phase distribution differences in the vertical direction, directly quantifies and compares the phase distribution state of the release agent solvent through visual inspection, and accurately locates defective areas, improving the accuracy of defect location in the release agent and enhancing the stability of adhesive film paper production quality.

[0046] Furthermore, this invention establishes a unified coordinate system to transform the fluorescence brightness data of overlapping and non-overlapping coating areas into visualized distribution curves. A first brightness spatial distribution curve is constructed based on the overlapping coating area data to capture the phase distribution change pattern after solvent mixing at different sampling heights. The brightness value of the overlapping area can reflect the compatibility and mixing stability between solvents. The fitted curve can intuitively present the brightness change trend when solvents at different heights interact. A second brightness spatial distribution curve is constructed based on the non-overlapping coating area data to obtain the original phase distribution characteristics of solvents at a single sampling height. The brightness value of the non-overlapping area is not affected by solvents at other heights and can truly reflect the uniformity of the solvent at that height. The second brightness spatial distribution curve and the first brightness spatial distribution curve form a comparison between independent and mixed states. By comparing the characteristics of the two curves, the phase distribution differences of solvents at different heights can be accurately determined.

[0047] Furthermore, this invention transforms the differences in solvent phase distribution into precise numerical quantification by quantifying the cumulative brightness difference between two curves. The first brightness quantification reflects the total brightness of solvents of different heights mixed in the entire detection space. Its value is directly related to the compatibility and uniformity of the solvents after mixing. If the phase distribution differences between solvents are large, local brightness anomalies after mixing will cause the total area to deviate from the benchmark. The second brightness quantification reflects the total brightness of a single-height solvent in an independent space, representing the basic phase distribution of the solvent itself. Based on the principle that the overlapping coating area is a repeated coating of solvents of two sampling heights, while the non-overlapping coating area is coated with solvent of a single sampling height, the total amount of oil and water phase substances per unit area in the overlapping coating area is twice that in the non-overlapping coating area, thus enabling rapid quantification and comparison of the solvent phase distribution of the release agent through visual inspection.

[0048] Furthermore, this invention accurately distinguishes two aggregation modes of large particles in the release agent solvent by judging whether the brightness value sequence increases. The brightness values ​​are sorted from smallest to largest according to the length of the adhesive film paper, corresponding to the sampling height from high to low. The brightness values ​​of the overlapping area are organized into a sequence accordingly. The order of this sequence directly maps the solvent distribution state from top to bottom in the storage tank. If the sequence increases, it indicates that the brightness of the overlapping area continues to rise as the sampling height decreases, reflecting that the large particles increase continuously with the decrease in height and accumulate layer by layer, corresponding to the first characteristic category of phase aggregation. If the sequence does not increase, it indicates that the large particles do not accumulate in a regular manner with height, but are randomly dispersed and aggregated in a certain height range, corresponding to the second characteristic category of phase aggregation, thus realizing the rapid identification of the essential characteristics of large particle aggregation.

[0049] Furthermore, this invention uses a first brightness spatial distribution curve to reflect the brightness change of the solvent in the overlapping area at different sampling heights. The gradual accumulation of large particles layer by layer leads to a gradual increase in brightness as the sampling height decreases. The larger the slope, the faster the number of large particles increases within a certain height range, and the more drastic the accumulation rate, which may exceed the requirements for the uniformity of the release agent in the production of adhesive film paper. If the maximum value exceeds the reference value, it indicates that the accumulation rate of large particles is abnormal, and the release agent may cause peeling defects in the adhesive film paper due to local over-polymerization. Therefore, it is judged as unqualified. This invention realizes the direct quantitative comparison of the solvent phase distribution of the release agent through visual inspection, thereby improving the stability of the production quality of adhesive film paper.

[0050] Furthermore, this invention accurately locates defective areas in the release agent caused by the irregular aggregation of large particles by analyzing the fluctuations of adjacent brightness value sequences. The order of the brightness value sequence is consistent with the order of solvent sampling height from high to low. The difference between adjacent brightness values ​​can directly reflect the degree of change in the aggregation state of large solvent particles within adjacent height intervals. If the difference is greater than the reference value, it indicates that there is abnormal aggregation of large solvent particles at a certain height within the adjacent interval, resulting in a local sharp increase or decrease. The brightness of the corresponding overlapping coating area changes abruptly. By locking these overlapping areas with excessive differences and finding their corresponding solvent sampling heights, the height range of defects in the storage tank can be accurately determined, transforming irregularly dispersed defects into specific locations that can be clearly traced, thereby improving the accuracy of locating defects in the release agent quality. Attached Figure Description

[0051] Figure 1 This is a step diagram of the defect visual inspection method for release agent used in the production of adhesive film paper according to an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram illustrating the division of a local area on the adhesive film paper according to an embodiment of the present invention;

[0053] Figure 3 This is a step diagram illustrating the process of coating a solvent sample onto a film paper according to an embodiment of the present invention;

[0054] Figure 4 This is a flowchart illustrating the logic of determining whether there is a difference in the phase distribution state of a solvent sample according to an embodiment of the present invention.

[0055] Figure 5 A flowchart illustrating the steps for determining the distribution location of defective release agent solvent in an embodiment of the present invention;

[0056] In the figure: 1 - Overlapping coating area, 2 - Non-overlapping coating area. Detailed Implementation

[0057] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0058] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0059] It should be noted that in the description of this invention, the terms "upper," "lower," "inner," "outer," etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0060] Please see Figure 1 The diagram shows the steps of a visual defect detection method for a release agent used in the production of adhesive film paper according to an embodiment of the present invention. The visual defect detection method for a release agent used in the production of adhesive film paper according to the present invention includes:

[0061] Step S100: Obtain solvent samples of the release agent under different sampling conditions, mix the solvent samples under different sampling conditions with the same dose of fluorescent agent, and then coat them sequentially on several local areas of the adhesive film paper.

[0062] Each local area is coated with a solvent sample under a sampling condition, and there is an overlapping coating area between any two local areas.

[0063] Please see Figure 2 As shown, it is a schematic diagram of dividing local areas on the adhesive film paper according to an embodiment of the present invention. The two local areas on the adhesive film paper are local area a1 and local area a2, and there is an overlapping coating area 1 between local area a1 and local area a2. There is also a non-overlapping coating area 2 on local area a1.

[0064] Specifically, the fluorescent agent used in this invention is a specific fluorescent substance with good compatibility. Preferably, it can be either water-soluble sodium fluorescein or oil-soluble Nile red. The dosage can be set by those skilled in the art. In this invention, the dosage of the fluorescent agent is 1% of the mass of each solvent sample.

[0065] Specifically, in the implementation of this invention, a fluorescence spectrophotometer can be used to determine the fluorescence brightness value, which is existing technology and will not be described in detail here.

[0066] Step S200: Irradiate each overlapping coated area and the non-overlapping coated area in each local area using an excitation light source. Construct a first brightness spatial distribution curve and a second brightness spatial distribution curve based on the obtained regional fluorescence brightness values. Determine whether there is a difference in the phase distribution state of the solvent sample based on the feature quantization comparison results of the two brightness spatial distribution curves.

[0067] In this invention, the excitation light source illuminates the overlapping coated areas and the non-overlapping coated areas within each local area at the same irradiation angle.

[0068] In this invention, the fluorescence brightness values ​​of the overlapping coated areas and the non-overlapping coated areas within each local area are the average fluorescence brightness values ​​per unit area, where the unit area can be 1 cm². 2 .

[0069] Specifically, the excitation light source in this invention is adjusted according to the selection of the fluorescent agent. For example, if water-soluble sodium fluorescein is selected, an excitation light source with an excitation wavelength of 490-495nm is selected; if oil-soluble Nile Red is selected, an excitation light source with an excitation wavelength of 550-560nm is selected.

[0070] Step S300: In response to the determination result that there is a difference in the phase distribution state, a brightness value sequence composed of fluorescence brightness values ​​of several overlapping coating areas is determined, and the phase polymerization characteristic category of the solvent sample is determined according to the numerical comparison within the brightness value sequence.

[0071] Step S400: Based on the phase polymerization characteristic category, select the curve information based on the first brightness spatial distribution curve to determine the qualification of the release agent solvent, or determine the distribution location of the defective release agent solvent based on the numerical fluctuation analysis results within the brightness value series.

[0072] Those skilled in the art should understand that the release agent is a solvent composed of a mixture of aqueous and oil phase components. In the use of the release agent, the release agent molecules first free onto the surface of the adhesive film paper, forming a film between the steel plate cavity and the adhesive film paper, thereby enabling the adhesive film paper to be quickly demolded during production.

[0073] Specifically, please refer to Figure 3 The diagram illustrates the steps of coating a solvent sample onto a film paper according to an embodiment of the present invention. The process of coating a solvent sample onto the film paper includes:

[0074] Step S101: Divide the adhesive film into several local areas along the length of the adhesive film, with the center-to-center distance between adjacent local areas being equal.

[0075] Step S102: Determine several solvent samples based on the differences in sampling conditions, wherein the sampling conditions are the sampling height of the release agent solvent;

[0076] In this invention, the sampling height interval of the stripping agent solvent can be determined according to the total height of the storage container of the stripping agent solvent. Preferably, the sampling height interval can be 1 / 5 of the total height of the storage container.

[0077] Step S103: Along the length of the adhesive film, solvent samples with sampling heights from high to low are sequentially coated on the local area.

[0078] In this invention, the overlapping coating area is the fusion area of ​​two solvents with different sampling heights, while the non-overlapping area can only reflect the state of a single solvent. By detecting the fluorescence brightness of the overlapping area, the phase distribution data after the two solvents are mixed can be directly obtained and compared with the single solvent data of the non-overlapping area.

[0079] It is understandable that this invention, through spatially ordered layout and corresponding association with samples, enables precise comparative detection of the phase distribution of the release agent solvent at different sampling heights, providing a controllable and traceable sample basis for subsequent visual analysis. Specifying the sampling condition as the sampling height of the release agent solvent is based on the physical characteristic that the multi-component mixture of the release agent is prone to stratification or localized polymerization due to density differences. Sampling by height can cover the entire solvent range within the container, avoiding defects caused by single-point sampling. Coating the sample along the length of the adhesive film paper from high to low sampling height aims to establish a correspondence between spatial location and sampling height. By analyzing changes in online fluorescence brightness, the trend of solvent phase distribution with height can be intuitively judged.

[0080] Specifically, the process of constructing the first luminance spatial distribution curve and the second luminance spatial distribution curve includes:

[0081] Establish a rectangular coordinate system with fluorescence brightness value as the vertical axis and film length as the horizontal axis;

[0082] Obtain the regional fluorescence brightness value of each overlapping coated area and the length value of the regional center of each overlapping coated area in the length direction of the adhesive film paper to determine a number of data points of a certain type. The curve formed by connecting the data points of a certain type in sequence is determined as the first brightness spatial distribution curve.

[0083] The fluorescence brightness value of each non-overlapping coated area and the length value of the center of each non-overlapping coated area along the length of the film paper are obtained to determine several types of data points. The curve formed by connecting the two types of data points in sequence is determined as the second brightness spatial distribution curve.

[0084] Understandably, this invention establishes a unified coordinate system to transform the fluorescence brightness data of overlapping and non-overlapping coating areas into visualized distribution curves. Based on the overlapping coating area data, a first brightness spatial distribution curve is constructed to capture the phase distribution change pattern after mixing solvents at different sampling heights. The brightness value of the overlapping area can reflect the compatibility and mixing stability between solvents. The fitted curve can intuitively present the brightness change trend when solvents at different heights interact. Based on the non-overlapping coating area data, a second brightness spatial distribution curve is constructed to obtain the original phase distribution characteristics of solvents at a single sampling height. The brightness value of the non-overlapping area is not affected by solvents at other heights and can truly reflect the uniformity of the solvent at that height. The second brightness spatial distribution curve and the first brightness spatial distribution curve form a comparison between independent and mixed states. By comparing the characteristics of the two curves, the phase distribution differences of solvents at different heights can be accurately determined.

[0085] Specifically, please refer to Figure 4 As shown, this is a flowchart illustrating the logic of determining whether there is a difference in the phase distribution state of a solvent sample according to an embodiment of the present invention. The process of performing feature quantization comparison on two brightness spatial distribution curves includes:

[0086] The area enclosed by the first luminance spatial distribution curve and the horizontal axis is defined as the first luminance quantization characteristic, and the area enclosed by the second luminance spatial distribution curve and the horizontal axis is defined as the second luminance quantization characteristic.

[0087] Calculate the ratio of the first luminance quantization measure to the second luminance quantization measure.

[0088] Specifically, the overlapping coating area is a repeated coating of two sampling height solvents, while the non-overlapping coating area is coated with only a single sampling height solvent. Therefore, the total amount of oil and water phase substances per unit area in the overlapping coating area is about twice that in the non-overlapping coating area. Under ideal conditions where the solvent phase distribution is consistent, the fluorescence brightness is linearly positively correlated with the effective amount of matter per unit area. Reflected in the area enclosed by the curve and the horizontal axis, the ratio of the first brightness quantification value to the second brightness quantification value theoretically approaches 2.

[0089] Specifically, this invention does not limit the calculation method of the area enclosed by the curve and the horizontal axis. The area enclosed by the curve and the coordinate axis is determined by accumulating the pixels of the image. This is existing technology and will not be described in detail here.

[0090] Specifically, the process of determining whether there are differences in the phase distribution of solvent samples includes:

[0091] The ratio is compared with a preset ratio reference range;

[0092] If the ratio is not within the reference range, it is determined that there is a difference in the phase distribution state of the solvent sample; if the ratio is within the reference range, it is determined that there is no difference in the phase distribution state of the solvent sample.

[0093] In this invention, the ratio reference range can be set according to the sensitivity of the detection. Based on the fact that the total amount of oil phase and water phase substances per unit area of ​​the overlapping coating area is twice the total amount of oil phase and water phase substances per unit area of ​​the non-overlapping coating area, the ratio reference range can be set to [1.95, 2.05].

[0094] It is understood that this invention transforms the difference in solvent phase distribution into a precise numerical quantification by quantifying the cumulative difference in brightness between two curves. The first brightness quantification reflects the total brightness of solvents of different heights mixed in the entire detection space. Its value is directly related to the compatibility and uniformity of the solvents after mixing. If the phase distribution difference between solvents is large, the local brightness abnormality after mixing will cause the total area to deviate from the benchmark. The second brightness quantification reflects the total brightness of a solvent of a single height in an independent space, representing the basic phase distribution of the solvent itself.

[0095] Specifically, the process of determining the sequence of brightness values ​​includes:

[0096] Sort the length values ​​of the center of each overlapping coated area along the length of the film paper from smallest to largest;

[0097] The fluorescence brightness values ​​of the corresponding overlapping coated areas are written into a sequence according to the length values ​​in ascending order to obtain the brightness value sequence.

[0098] Specifically, the process of determining the phase polymerization characteristic category of the solvent sample based on the numerical comparison within the brightness value series includes:

[0099] If the brightness value sequence meets the numerical comparison screening conditions, then the solvent sample is determined to be the first characteristic category of phase polymerization;

[0100] If the brightness value sequence does not meet the numerical comparison screening conditions, the solvent sample is determined to be the second characteristic category of phase polymerization;

[0101] The numerical comparison and filtering condition is that the brightness value sequence is an increasing sequence.

[0102] Understandably, this invention accurately distinguishes two aggregation modes of large particles in the release agent solvent by judging whether the brightness value sequence increases. The brightness values ​​are sorted from smallest to largest according to the length of the adhesive film, corresponding to a sampling height from high to low. A sequence of brightness values ​​in the overlapping area is then formed based on this sequence, directly mapping the solvent distribution from top to bottom within the storage tank. If the sequence increases, it indicates that the brightness of the overlapping area continuously rises as the sampling height decreases, reflecting a continuous increase in the number of large particles as the height decreases, exhibiting a layer-by-layer accumulation state, corresponding to the first characteristic category of phase aggregation. If the sequence does not increase, it indicates that the large particles do not accumulate systematically with height, but rather are randomly dispersed and aggregated within a certain height range, corresponding to the second characteristic category of phase aggregation, thus quickly identifying the essential characteristics of large particle aggregation.

[0103] Specifically, the method for determining the pass / fail defects of solvent samples is selected based on the aforementioned phase polymerization characteristic category, wherein,

[0104] If the solvent sample is of the first characteristic category of phase polymerization, then the qualification of the release agent solvent is determined by the curve information based on the first brightness spatial distribution curve.

[0105] If the solvent sample belongs to the second characteristic category of phase polymerization, the distribution location of the defective release agent solvent is determined based on the numerical fluctuation analysis results within the brightness value series.

[0106] Specifically, the process of determining the suitability of the release agent solvent based on the curve information of the first brightness spatial distribution curve includes:

[0107] Determine the slope of the curve for several data points on the first brightness spatial distribution curve;

[0108] Compare the maximum slope of the curve with the preset reference slope value;

[0109] If the maximum value of the curve slope is greater than the reference value of the curve slope, the solvent of the release agent is deemed unqualified; if the maximum value of the curve slope is less than or equal to the reference value of the curve slope, the solvent of the release agent is deemed qualified.

[0110] In this invention, the slope of any data point on the curve can be calculated using the coordinates of adjacent data points, which will not be elaborated here.

[0111] Specifically, the curve slope reference value in the implementation of the present invention is set in advance by those skilled in the art based on the calculation results of historical data. The average slope T0 of the first brightness spatial distribution curve of the same specification of release agent solvent at the same sampling height interval is calculated in advance. The curve slope reference value T = δ × T0, where δ is the curve slope reference value factor and the value range of δ is [1.1, 1.15]. Preferably, the value of δ is 1.12.

[0112] Understandably, when the solvent sample is in the first characteristic category of phase polymerization, the first brightness spatial distribution curve reflects the brightness change of the solvent in the overlapping area at different sampling heights. The gradual accumulation of large particles will cause the brightness to increase gradually as the sampling height decreases. The larger the slope, the faster the number of large particles increases within a certain height range, and the more drastic the accumulation rate, which may exceed the requirements for the uniformity of the release agent in the production of film paper. If the maximum value exceeds the reference value, it indicates that the accumulation rate of large particles is abnormal. The release agent may cause peeling defects in the film paper due to local over-polymerization, so it is judged as unqualified. This realizes the direct quantitative comparison of the solvent phase distribution state of the release agent through visual inspection, which improves the stability of the production quality of film paper.

[0113] Specifically, please refer to Figure 5 The diagram illustrates the steps for determining the distribution location of defective release agent solvents according to an embodiment of the present invention. The process for determining the distribution location of defective release agent solvents includes:

[0114] Step S401: Obtain the difference between two adjacent brightness values ​​within the brightness value sequence;

[0115] Step S402: Determine the overlapping coating area to which the adjacent brightness values ​​corresponding to the difference value is greater than the preset difference reference value belong, and determine the sampling height of the solvent sample coated in the overlapping coating area to which the adjacent brightness values ​​belong.

[0116] Step S403: Determine the defect area based on the sampling height, and determine the defect area as the distribution location of the defective release agent solvent.

[0117] In practice, the solvent samples of the overlapping coating areas of adjacent brightness values ​​correspond to multiple sampling heights. The minimum sampling height is taken as the starting height of the height interval, and the maximum sampling height is taken as the ending height of the height interval. The determined height interval is then defined as the defect area.

[0118] Specifically, the difference reference value in the implementation of this invention is set in advance by those skilled in the art based on historical data calculation results. The average difference between two adjacent brightness values ​​in the brightness value series of the same specification of release agent solvent at the same sampling height interval is calculated in advance. The difference reference value L = β × L0, where β is the difference reference value factor and the value range of β is [1.1, 1.2]. Preferably, the value of β is 1.15.

[0119] It can be understood that when the solvent sample is of the second characteristic category of phase polymerization, this invention can accurately locate the defective area of ​​the release agent caused by the irregular aggregation of large particles by analyzing the fluctuation of adjacent values ​​in the brightness value series. The order of the brightness value series is consistent with the order of the solvent sampling height from high to low. The difference between adjacent brightness values ​​can directly reflect the degree of change in the aggregation state of large solvent particles in adjacent height intervals. If the difference is greater than the reference value, it indicates that there is abnormal aggregation of large solvent particles at a certain height in the adjacent interval, with a local sharp increase or decrease. The brightness of the corresponding overlapping coating area changes abruptly. By locking these overlapping areas with excessive differences and finding their corresponding solvent sampling heights, the height range of defects in the storage tank can be accurately determined, transforming the irregularly dispersed defects into specific locations that can be clearly traced, thereby improving the accuracy of the location of defects in the release agent quality.

[0120] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the aforementioned method steps to implement the aforementioned defect visual detection method.

[0121] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0122] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for visually inspecting defects in a release agent used in the production of adhesive-coated paper, characterized in that, include: Solvent samples of the release agent under different sampling conditions were obtained. The solvent samples under different sampling conditions were mixed with the same dose of fluorescent agent and then coated sequentially on several local areas of the adhesive film. Each local area is coated with a solvent sample under a sampling condition, and there is an overlapping coating area between any two local areas. The overlapping coated areas and the non-overlapping coated areas in each local area are irradiated using an excitation light source. Based on the obtained regional fluorescence brightness values, a first brightness spatial distribution curve and a second brightness spatial distribution curve are constructed. Based on the feature quantization comparison results of the two brightness spatial distribution curves, it is determined whether there is a difference in the phase distribution state of the solvent sample. The process of constructing the first and second luminance spatial distribution curves includes: Establish a rectangular coordinate system with fluorescence brightness value as the vertical axis and film length as the horizontal axis; Obtain the regional fluorescence brightness value of each overlapping coated area and the length value of the regional center of each overlapping coated area in the length direction of the adhesive film paper to determine a number of data points of a certain type. The curve formed by connecting the data points of a certain type in sequence is determined as the first brightness spatial distribution curve. Obtain the regional fluorescence brightness value of each non-overlapping coated area and the length value of the regional center of each non-overlapping coated area along the length of the adhesive film paper to determine several types of data points. The curve formed by connecting the two types of data points in sequence is determined as the second brightness spatial distribution curve. In response to the determination result that there is a difference in phase distribution state, a brightness value series composed of fluorescence brightness values ​​of several overlapping coating areas is determined, and the phase polymerization characteristic category of the solvent sample is determined based on the numerical comparison within the brightness value series; The qualification of the release agent solvent is determined by selecting the curve information based on the first brightness spatial distribution curve according to the phase polymerization characteristic category, or by determining the distribution location of the defective release agent solvent based on the numerical fluctuation analysis results within the brightness value series.

2. The method for visual inspection of defects in a release agent used in the production of adhesive-coated paper according to claim 1, characterized in that, The process of coating solvent samples onto adhesive paper includes: The adhesive film is divided into several local regions along its length, with the center-to-center distance between adjacent local regions being equal. Several solvent samples were determined based on the differences in sampling conditions, wherein the sampling conditions were the sampling height of the release agent solvent; Solvent samples with sampling heights from high to low are applied sequentially to local areas along the length of the adhesive film.

3. The defect visual inspection method for release agent used in the production of adhesive film paper according to claim 1, characterized in that, The process of performing feature quantization comparison on two brightness spatial distribution curves includes: The area enclosed by the first luminance spatial distribution curve and the horizontal axis is defined as the first luminance quantization characteristic, and the area enclosed by the second luminance spatial distribution curve and the horizontal axis is defined as the second luminance quantization characteristic. Calculate the ratio of the first luminance quantization measure to the second luminance quantization measure.

4. The defect visual inspection method for release agent used in the production of adhesive film paper according to claim 3, characterized in that, The process of determining whether there are differences in the phase distribution of solvent samples includes: The ratio is compared with a preset ratio reference range; If the ratio is not within the reference range, it is determined that there is a difference in the phase distribution state of the solvent sample.

5. The defect visual inspection method for release agent used in the production of adhesive film paper according to claim 4, characterized in that, The process of determining the brightness value sequence includes: Sort the length values ​​of the center of each overlapping coated area along the length of the film paper from smallest to largest; The fluorescence brightness values ​​of the corresponding overlapping coated areas are written into a sequence according to the length values ​​in ascending order to obtain the brightness value sequence.

6. The defect visual inspection method for release agent used in the production of adhesive film paper according to claim 5, characterized in that, The process of determining the phase polymerization characteristic category of the solvent sample based on the numerical comparison within the brightness value series includes: If the brightness value sequence meets the numerical comparison screening conditions, then the solvent sample is determined to be the first characteristic category of phase polymerization; If the brightness value sequence does not meet the numerical comparison screening conditions, the solvent sample is determined to be the second characteristic category of phase polymerization; The numerical comparison and filtering condition is that the brightness value sequence is an increasing sequence.

7. The method for visual inspection of defects in a release agent used in the production of adhesive-coated paper according to claim 6, characterized in that, The method for determining the pass / fail defects of solvent samples is selected based on the aforementioned phase polymerization characteristic category, wherein, If the solvent sample is of the first characteristic category of phase polymerization, then the qualification of the release agent solvent is determined by the curve information based on the first brightness spatial distribution curve. If the solvent sample belongs to the second characteristic category of phase polymerization, the distribution location of the defective release agent solvent is determined based on the numerical fluctuation analysis results within the brightness value series.

8. The method for visual inspection of defects in a release agent used in the production of adhesive-coated paper according to claim 7, characterized in that, The process of determining the qualification of the release agent solvent based on the curve information of the first brightness spatial distribution curve includes: Determine the slope of the curve for several data points on the first brightness spatial distribution curve; Compare the maximum slope of the curve with the preset reference slope value; If the maximum value of the curve slope is greater than the reference value of the curve slope, the solvent of the release agent is deemed unqualified; if the maximum value of the curve slope is less than or equal to the reference value of the curve slope, the solvent of the release agent is deemed qualified.

9. The method for visual inspection of defects in a release agent used in the production of adhesive-coated paper according to claim 7, characterized in that, The process of determining the distribution location of defective release agent solvent includes: Obtain the difference between two adjacent brightness values ​​within the brightness value sequence; Determine the overlapping coating area to which the adjacent brightness values ​​corresponding to the difference value is greater than the preset difference reference value, and determine the sampling height of the solvent sample coated in the overlapping coating area to which the adjacent brightness values ​​belong; Based on the sampling height, the defect area is determined, and the defect area is identified as the distribution location of the defective release agent solvent.

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