Multi-process quality data tracing method and system in packaging stay wire production process

Abstract

The invention relates to the technical field of packaging material production, in particular to a multi-process quality data tracing method and system in a packaging stay wire production process. The method comprises the following steps: establishing a two-dimensional coordinate system based on a raw material mother roll, periodically implanting anchor point marks at the edge and recording a reference position; calculating an elastic deformation rate based on the operation tension and the elastic modulus of the material, and dynamically compensating the transmission length by using the elastic deformation rate to generate a mother roll quality fingerprint map; generating a topological mapping relation based on the positions of the sub-volumes in a slitting link, and intercepting and generating a sub-volume quality file; and in the rewinding process, an accumulative error is calculated by comparing the actual measurement position with the reference position, and coordinate calibration is carried out on the sub-roll quality file by utilizing the accumulative error, so that reverse tracing is realized. According to the method, the problem of position drift of the flexible material caused by elastic deformation in multi-process processing is effectively solved, and the precision and reliability of quality data tracing are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of packaging material production technology. More specifically, this application relates to a method and system for tracing quality data across multiple processes in the packaging production line. Background Technology

[0002] Packaging pull cords are an important auxiliary material in the packaging of industries such as tobacco, food, and pharmaceuticals. Their production process involves multiple steps, including coating, printing, slitting, and rewinding. With downstream customers continuously raising their product quality requirements, establishing a comprehensive quality traceability system has become an inevitable trend in the industry.

[0003] Existing quality traceability methods primarily rely on batch management and timestamp recording. Batch management treats products from the same production batch as a whole, failing to accurately pinpoint the original process parameters corresponding to individual defects. While timestamp recording can link production time with process data, it ignores the elastic deformation of flexible materials under tension. The substrate of packaging pull cords is typically polypropylene or polyester film, which undergoes tensile deformation due to tension fluctuations during production line operation. This results in a cumulative error between the transmission length calculated based on the linear velocity integral and the actual physical length. This error amplifies as the production line length increases, gradually distorting the mapping between quality data and the physical location of materials.

[0004] Traditional traceability methods often only achieve batch-level traceability, failing to pinpoint specific meters or coordinates. When quality complaints arise with finished products, it's difficult to effectively reconstruct the original process parameters of the defective point on the raw material master roll, making it impossible to eradicate potential quality issues. This data recording method, lacking deformation compensation and physical anchoring mechanisms, prevents the system from maintaining data consistency across multiple processes, resulting in low traceability accuracy, large error accumulation, and an inability to meet the engineering requirements of modern precision manufacturing. Summary of the Invention

[0005] The purpose of this application is to propose a method and system for tracing quality data of multiple processes in the packaging production process, so as to solve the problems of poor accuracy and difficulty in tracing quality data in the packaging production process in the prior art.

[0006] In the first aspect, the multi-process quality data traceability method for packaging thread production provided in this application includes: establishing a two-dimensional coordinate system based on the length and width directions of the raw material master roll; periodically embedding anchor marks carrying unique coded information at preset physical intervals on the edge of the master roll; and recording the coordinate values ​​of each anchor mark in the two-dimensional coordinate system as the reference position; collecting quality data of each process in real time during production, simultaneously acquiring the running tension and linear velocity of the master roll, and calculating the elastic deformation rate in combination with the material's elastic modulus; obtaining the transmission length by time integration of the linear velocity of the master roll, and using the elastic deformation rate to trace the transmission... The length of the input is dynamically compensated, and the quality data at the corresponding moment is mapped to a two-dimensional coordinate system to generate a master volume quality fingerprint map. In the slicing stage, a topological mapping relationship is generated based on the positional relationship of multiple sub-volumes on the master volume. Based on the topological mapping relationship, data of the corresponding area is extracted from the master volume quality fingerprint map to generate sub-volume quality archives for each sub-volume. During the re-rolling process, anchor point marks on the sub-volumes are identified, and the cumulative error between the measured position and the reference position of the anchor point marks is calculated. The cumulative error is used to calibrate the longitudinal coordinates of the sub-volume quality archives, thereby realizing reverse traceability from the finished sub-volume to the original quality parameters of the master volume based on the calibrated data.

[0007] This invention effectively eliminates positional drift errors caused by tension fluctuations in flexible materials by embedding anchor marks on the master roll and establishing a two-dimensional coordinate system, combined with dynamic compensation for transmission length based on elastic deformation rate. Data inheritance between the master roll and the sub-roll is achieved through topological mapping, and secondary calibration is performed during the rewinding process using anchor marks. This establishes a complete traceability link from the finished sub-roll to the original process parameters of the master roll, significantly improving the accuracy and reliability of multi-process quality data traceability.

[0008] Optionally, the establishment of the two-dimensional coordinate system includes: defining the physical transmission direction of the raw material master roll as the horizontal coordinate axis, defining the width direction perpendicular to the physical transmission direction as the vertical coordinate axis; setting the first edge of the raw material master roll entering the production line as the zero point of the two-dimensional coordinate system; and constructing a two-dimensional coordinate system covering the full width and full length of the raw material master roll.

[0009] Optionally, the step of implanting anchor marks carrying unique coded information includes: controlling a coding device or a laser etching device to generate anchor marks in the non-printed edge area of ​​the master roll, wherein the anchor marks are optically identifiable marks or physical feature marks, including but not limited to ultraviolet fluorescent QR codes, infrared invisible barcodes or laser micro-perforated arrays.

[0010] This invention uses ultraviolet fluorescent QR codes, infrared invisible barcodes, or laser micro-perforated arrays as anchor point markers. These marking methods are characterized by strong concealment, do not affect the product appearance or subsequent packaging performance, and can be identified at high speed by industrial cameras or sensors, ensuring the reliability and stability of coordinate positioning in high-speed production environments.

[0011] Optionally, the calculation process of the elastic deformation rate includes: obtaining the initial cross-sectional area and elastic modulus of the raw material master roll; reading the running tension value output by the tension sensor at the current sampling time; calculating the ratio of the running tension value to the initial cross-sectional area to obtain the instantaneous tensile stress; and calculating the ratio of the instantaneous tensile stress to the elastic modulus to obtain the elastic deformation rate at the current sampling time.

[0012] Optionally, the step of dynamically compensating the transmission length using the elastic deformation rate includes: setting a preset time sampling period; calculating the product of the average linear velocity and the sampling duration within the current sampling period to obtain the incremental length; constructing a shrinkage correction coefficient based on the elastic deformation rate, wherein the shrinkage correction coefficient is negatively correlated with the elastic deformation rate; calculating the product of the incremental length and the shrinkage correction coefficient to obtain the physical incremental length after deducting the tensile deformation; and adding the accumulated longitudinal physical coordinates of the previous sampling moment to the physical incremental length to obtain the calibrated longitudinal physical coordinates of the current sampling moment.

[0013] This invention calculates instantaneous tensile stress based on real-time tension and initial cross-sectional area, and then accurately derives the elastic deformation rate by combining it with the elastic modulus. By constructing a shrinkage correction coefficient negatively correlated with the deformation rate, the length measurement error caused by tension fluctuations can be eliminated in real time, significantly improving the physical accuracy of the longitudinal coordinates in the mass fingerprint map.

[0014] Optionally, the process of generating the master volume quality fingerprint includes: obtaining the physical installation distance of the sensor for the current quality data in the width direction of the master volume, and determining the physical installation distance as the horizontal coordinate; determining the vertical physical coordinate after calibration at the current sampling time as the vertical coordinate; and writing the quality data into a two-dimensional matrix node or database record row determined by the horizontal coordinate and the vertical coordinate to obtain a master volume quality fingerprint containing spatiotemporal data.

[0015] Optionally, the step of generating the topology mapping relationship includes: obtaining the arrangement spacing data of the slitting tool group in the width direction of the parent roll; assigning a unique sub-roll identifier code to each sub-roll generated by slitting according to the arrangement spacing data, defining the horizontal coordinate interval corresponding to each sub-roll identifier code in the two-dimensional coordinate system of the parent roll, and establishing a topology mapping table with the sub-roll identifier code as the index key and the horizontal coordinate interval as the index value.

[0016] This invention establishes a topological mapping table with sub-volume identifiers as index keys and horizontal coordinate ranges as index values, digitally describing the correspondence between the arrangement of slitting tools and the generation of sub-volumes. This enables the system to quickly and automatically relocate massive amounts of sub-volume data to the width and layout of the parent volume without manual recording, greatly improving the efficiency and accuracy of data association.

[0017] Optionally, the step of calibrating the longitudinal coordinates of the sub-volume quality archive using cumulative error includes: acquiring the target anchor point marker identified during the re-rolling process and the reference position of the anchor point marker; acquiring the reference position of the previously identified preceding anchor point marker and calculating the difference between the two to obtain the theoretical physical distance; calculating the measured running distance between the target anchor point marker and the preceding anchor point marker; calculating the ratio of the theoretical physical distance to the measured running distance to obtain a linear scaling factor; using the linear scaling factor to perform multiplicative correction on the longitudinal coordinates of data points located between the target anchor point marker and the preceding anchor point marker in the sub-volume quality archive, and performing overall position alignment of the corrected longitudinal coordinates based on the reference position of the target anchor point marker.

[0018] This invention utilizes the anchor point markers identified during the rewinding process to calculate the ratio of the theoretical physical distance to the measured running distance as a linear scaling factor, performing multiplicative correction on the sub-volume quality archive within an interval. This segmented linear calibration strategy effectively eliminates nonlinear cumulative errors caused by slippage and tension fluctuations during the rewinding process, ensuring a high degree of alignment between the final product data delivered to the customer and the original data of the parent volume.

[0019] Optionally, the step of reverse tracing from the finished sub-volume to the original quality data of the parent volume includes: receiving a query request, the query request containing the target sub-volume identifier code and the relative position value of the defect point on the sub-volume; retrieving the vertical coordinate corresponding to the relative position value in the calibrated sub-volume quality archive; using the topology mapping table, converting the target sub-volume identifier code into the horizontal coordinate range of the parent volume; and retrieving and outputting the corresponding original quality parameters in the parent volume quality fingerprint map using the vertical coordinate and the horizontal coordinate range as joint index conditions.

[0020] In the second aspect, the multi-process quality data traceability system for the packaging production line includes: processor; The memory stores computer instructions for a multi-process quality data traceability method in the packaging production line, which, when executed by the processor, causes the system to perform the aforementioned multi-process quality data traceability system in the packaging production line.

[0021] The beneficial effects of this application are as follows: This invention establishes a spatial positioning system covering the entire area of ​​the master roll by combining anchor point markings with a two-dimensional coordinate system; it eliminates the positional drift error of flexible materials through real-time calculation and dynamic compensation of elastic deformation rate; it realizes data inheritance between the master roll and the sub-roll through topological mapping relationship; and it further improves traceability accuracy through secondary calibration in the rewinding process. This invention effectively solves the data discontinuity problem caused by material elastic deformation and multi-process flow, and significantly improves the traceability accuracy and efficiency from finished product to raw material. Attached Figure Description

[0022] Figure 1 This is a flowchart of a multi-process quality data traceability method in the packaging production line according to an embodiment of this application.

[0023] Figure 2 This is a topological mapping diagram of a multi-process quality data traceability method in the packaging production line according to an embodiment of this application.

[0024] Figure 3 This is a comparison chart of the traceability accuracy of the multi-process quality data traceability method in the packaging production line according to the embodiments of this application.

[0025] Figure 4 This is a structural block diagram of a multi-process quality data traceability system for packaging production line according to an embodiment of this application. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Figure 1 The diagram shown is a flowchart of a multi-process quality data traceability method in the packaging production process according to an embodiment of this application.

[0027] S1: Establish a two-dimensional coordinate system based on the raw material master roll and embed anchor point markers carrying unique coding information.

[0028] A two-dimensional coordinate system is established based on the length and width of the raw material master roll. Anchor marks carrying unique coded information are periodically implanted on the edge of the master roll at preset physical intervals, and the coordinate values ​​of each anchor mark in the two-dimensional coordinate system are recorded as the reference position.

[0029] The establishment of the two-dimensional coordinate system includes: defining the physical transmission direction of the raw material master roll as the longitudinal coordinate axis, defining the width direction perpendicular to the physical transmission direction as the transverse coordinate axis; setting the first edge of the raw material master roll entering the production line as the zero point of the two-dimensional coordinate system; and constructing a two-dimensional coordinate system covering the full width and full length of the raw material master roll.

[0030] The step of implanting anchor marks carrying unique coded information includes: controlling a coding device or a laser etching device to generate anchor marks in the non-printed edge area of ​​the master roll. The anchor marks can be ultraviolet fluorescent QR codes, infrared invisible barcodes, or laser micro-perforation arrays. In this embodiment, ultraviolet fluorescent QR codes are used as anchor marks, with the coding position set in the non-printed area 5 mm from the width boundary of the master roll edge. Alternatively, infrared invisible barcodes can be used as anchor marks, generating barcodes visible only under infrared light at the edge of the master roll using an infrared inkjet printer. Alternatively, a laser etching device can be used to form a laser micro-perforation array at the edge of the master roll, encoding unique identification information through the arrangement and combination of perforations.

[0031] The physical interval of the anchor points is set to 10 meters, meaning one anchor point is implanted every 10 meters. Each anchor point carries unique coded information, including the master volume batch number, anchor point sequence number, and theoretical vertical coordinate value. The coordinate values ​​of each anchor point in the two-dimensional coordinate system are recorded in the database as the reference position.

[0032] S2: Collect quality data and generate a master volume quality fingerprint.

[0033] In the production process, quality data of each process is collected in real time, and the running tension and linear velocity of the master roll are obtained. The elastic deformation rate is calculated by combining the elastic modulus of the material. The transmission length is obtained by integrating the linear velocity of the master roll over time. The transmission length is dynamically compensated using the elastic deformation rate. The quality data at the corresponding moment is mapped to a two-dimensional coordinate system to generate a master roll quality fingerprint.

[0034] The calculation process for the elastic deformation rate includes obtaining the initial cross-sectional area and elastic modulus of the raw material master roll. In this embodiment, the master roll substrate is a biaxially oriented polypropylene film with a thickness of 25 micrometers, a width of 1200 millimeters, an initial cross-sectional area of ​​30 square millimeters, and an elastic modulus of 2.5 gigapascals.

[0035] The operating tension value output by the tension sensor at the current sampling moment is read. In this embodiment, the sampling frequency of the tension sensor is 100 Hz. The ratio of the operating tension value to the initial cross-sectional area is calculated to obtain the instantaneous tensile stress. The ratio of the instantaneous tensile stress to the elastic modulus is calculated to obtain the elastic deformation rate at the current sampling moment. The formula for calculating the elastic deformation rate is as follows: ; in, This represents the elastic deformation rate, which is dimensionless. This represents instantaneous tensile stress, measured in Pascals. This represents the elastic modulus, with the unit being Pascal. This indicates the operating tension value, expressed in Newtons. This represents the initial cross-sectional area, in square meters.

[0036] The step of dynamically compensating for transmission length using elastic deformation rate includes: setting a preset time sampling period, which is set to 10 milliseconds in this embodiment; calculating the product of the average linear velocity within the current sampling period and the sampling duration to obtain the incremental length.

[0037] A shrinkage correction coefficient is constructed based on the elastic deformation rate, and the shrinkage correction coefficient is negatively correlated with the elastic deformation rate. The formula for calculating the shrinkage correction coefficient is as follows: ; in, This represents the shrinkage correction factor, which is dimensionless. This represents the elastic deformation rate, which is dimensionless.

[0038] Calculate the product of the incremental length and the shrinkage correction coefficient to obtain the physical incremental length after deducting the tensile deformation. Add the accumulated longitudinal physical coordinates from the previous sampling time to the physical incremental length to obtain the calibrated longitudinal physical coordinates at the current sampling time.

[0039] The process of generating the master roll quality fingerprint includes: acquiring the physical installation distance of the sensor for the current quality data in the width direction of the master roll, and determining the physical installation distance as the lateral coordinate. In this embodiment, the coating thickness sensor is installed at 200 mm, 600 mm, and 1000 mm positions in the width direction, and the printing color difference sensor is installed at 400 mm and 800 mm positions in the width direction.

[0040] The vertical physical coordinates calibrated at the current sampling time are determined as the vertical coordinates. The quality data is written into the two-dimensional matrix nodes or database record rows determined by the horizontal and vertical coordinates to obtain a parent volume quality fingerprint map containing spatiotemporal data.

[0041] S3: Generate topology mappings and create subvolume quality archives.

[0042] In the slicing stage, a topology mapping relationship is generated based on the positional relationship of multiple sub-volumes on the parent volume. Based on the topology mapping relationship, data of the corresponding area is extracted from the quality fingerprint map of the parent volume to generate the sub-volume quality profile of each sub-volume.

[0043] The steps for generating the topology mapping relationship include: obtaining the arrangement spacing data of the slitting tool group in the width direction of the master roll. In this embodiment, the slitting tool group divides the 1200 mm wide master roll into 6 sub-rolls, each sub-roll being 200 mm wide.

[0044] Based on the arrangement spacing data, a unique sub-volume identifier is assigned to each sub-volume generated by the splitting process, and the horizontal coordinate range corresponding to each sub-volume identifier in the parent volume's two-dimensional coordinate system is defined. In this embodiment, the sub-volume identifier adopts the format of "parent volume batch number - sub-volume sequence number". Sub-volume 1 corresponds to a horizontal coordinate range of 0 to 200 mm, sub-volume 2 corresponds to a horizontal coordinate range of 200 to 400 mm, and so on.

[0045] Establish a topology mapping table with sub-volume identifiers as index keys and horizontal coordinate intervals as index values. Based on the topology mapping table, extract all quality data within the corresponding horizontal coordinate intervals of each sub-volume from the parent volume's quality fingerprint map to generate a sub-volume quality profile for each sub-volume. For example... Figure 2 The diagram shown is a topology mapping of a multi-process quality data traceability method in the packaging production line according to an embodiment of this application. The stripes of different textures and colors represent slit sub-rolls. Red markers indicate detected quality defects. This application can accurately determine the specific coordinates of the defect on the sub-roll and trace it back to the original coating parameters of the parent roll. This visualized topology dashboard provides production managers with an intuitive means of quality monitoring, achieving WYSIWYG quality management.

[0046] S4: Calibrate the sub-volume quality archive and enable reverse traceability.

[0047] During the re-rolling process, anchor point marks on the sub-volumes are identified, and the measured positions of the anchor point marks are compared with the reference positions to calculate the cumulative error. The cumulative error is used to calibrate the longitudinal coordinates of the sub-volume quality archives, thereby enabling reverse traceability from the finished sub-volume to the original quality parameters of the parent volume based on the calibrated data.

[0048] The step of calibrating the longitudinal coordinates of the sub-volume quality archive using cumulative error includes: acquiring the target anchor point markers identified during the re-rolling process and the reference position of the anchor point markers. In this embodiment, an ultraviolet light source is used to illuminate the edge of the sub-volume, and an industrial camera is used to identify and decode the ultraviolet fluorescent QR code to obtain the anchor point marker information.

[0049] The reference position of the previously identified anchor point is obtained, and the difference between the two is calculated to obtain the theoretical physical distance. In this embodiment, the theoretical physical distance between adjacent anchor points is 10 meters. The measured running distance between the target anchor point and the previous anchor point is calculated.

[0050] The ratio of the theoretical physical distance to the measured running distance is calculated to obtain a linear scaling factor. This linear scaling factor is then used to multiply and correct the longitudinal coordinates of data points located between the target anchor point and the preceding anchor point in the sub-volume quality archive. Finally, the corrected longitudinal coordinates are aligned globally based on the reference position of the target anchor point.

[0051] The steps for achieving reverse traceability from the finished sub-volume to the original quality data of the master volume include: receiving a query request, the query request containing the target sub-volume identifier code and the relative position value of the defect point on the sub-volume.

[0052] Retrieve the vertical coordinates corresponding to the relative position values ​​from the calibrated sub-volume quality archive. Using the topology mapping table, convert the target sub-volume identifier into a horizontal coordinate range for the parent volume. Using the vertical coordinates and the horizontal coordinate range as a combined index, retrieve and output the corresponding original quality parameters from the parent volume quality fingerprint map.

[0053] like Figure 3 The diagram shows a comparison of the traceability accuracy of the multi-process quality data traceability method in the packaging thread production process according to an embodiment of this application. The black dotted line shows that the positional error exhibits a linear divergence trend with the increase of the rewinding length. This is because the integral error cannot be eliminated, resulting in an error at the meter level at the end of the roll, which cannot meet the requirements of precision manufacturing. The green solid line shows that after introducing the anchor point marking mechanism, the cumulative error exhibits a periodic sawtooth convergence. Each time an anchor point is passed, the position coordinates are forcibly zeroed and calibrated. The traceability accuracy is improved from the meter level to the centimeter level or even the millimeter level, ensuring the absolute accuracy of defect location.

[0054] According to a second aspect of this application, this application also provides a multi-process quality data traceability system for the packaging production line. Figure 4 This is a structural block diagram of a multi-process quality data traceability system for packaging production lines according to an embodiment of this application. For example... Figure 4 As shown, the system includes a processor and a memory. The memory stores computer program instructions, which, when executed by the processor, implement the multi-process quality data traceability method for packaging production lines according to the first aspect of this application. The system also includes other components well-known to those skilled in the art, such as a communication bus and a communication interface. Their configuration and functions are known in the art and will not be described further here.

[0055] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be within the scope of protection of this application.

Claims

1. A method for tracing quality data across multiple processes during packaging production, characterized in that: The method includes: A two-dimensional coordinate system is established based on the length and width of the raw material master roll. Anchor marks carrying unique coding information are periodically implanted on the edge of the master roll at preset physical intervals, and the coordinate values ​​of each anchor mark in the two-dimensional coordinate system are recorded as the reference position. In the production process, quality data of each process is collected in real time, and the running tension and linear velocity of the master roll are obtained. The elastic deformation rate is calculated in combination with the material elastic modulus. The transmission length is obtained by time integration of the linear velocity of the master roll. The transmission length is dynamically compensated using the elastic deformation rate. The quality data at the corresponding moment is mapped to a two-dimensional coordinate system to generate a master roll quality fingerprint. In the slicing stage, a topology mapping relationship is generated based on the positional relationship of multiple sub-volumes on the parent volume. Based on the topology mapping relationship, data of the corresponding area is extracted from the quality fingerprint map of the parent volume to generate the sub-volume quality profile of each sub-volume. During the re-rolling process, anchor point marks on the sub-volumes are identified, and the cumulative error between the measured position and the reference position of the anchor point marks is calculated. The cumulative error is used to calibrate the longitudinal coordinates of the sub-volume quality archives, thereby enabling reverse traceability from the finished sub-volume to the original quality parameters of the parent volume based on the calibrated data.

2. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The establishment of the two-dimensional coordinate system includes: The physical transport direction of the raw material master roll is defined as the horizontal coordinate axis, and the width direction perpendicular to the physical transport direction is defined as the vertical coordinate axis. The first edge of the raw material master roll entering the production line is set as the zero point of the two-dimensional coordinate system; Construct a two-dimensional coordinate system covering the full width and length of the raw material master roll.

3. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The step of implanting anchor markers carrying unique coded information includes: The inkjet printer or laser etching device is controlled to generate anchor marks in the non-printed edge area of ​​the master roll. The anchor marks are optically identifiable marks or physical feature marks, including but not limited to ultraviolet fluorescent QR codes, infrared invisible barcodes, or laser micro-perforated arrays.

4. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The calculation process for the elastic deformation rate includes: Obtain the initial cross-sectional area and elastic modulus of the raw material master roll; Read the operating tension value output by the tension sensor at the current sampling moment; The instantaneous tensile stress is obtained by calculating the ratio of the running tension value to the initial cross-sectional area. The ratio of the instantaneous tensile stress to the elastic modulus is calculated to obtain the elastic deformation rate at the current sampling time.

5. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The step of dynamically compensating for the transmission length using the elastic deformation rate includes: A preset time sampling period is used to calculate the product of the average linear velocity within the current sampling period and the sampling duration to obtain the incremental length; a shrinkage correction coefficient is constructed based on the elastic deformation rate, and the shrinkage correction coefficient is negatively correlated with the elastic deformation rate; Calculate the product of the incremental length and the shrinkage correction coefficient to obtain the physical incremental length after deducting the tensile deformation; The longitudinal physical coordinates accumulated at the previous sampling time are added to the physical increment length to obtain the calibrated longitudinal physical coordinates at the current sampling time.

6. The method for tracing quality data across multiple processes in the packaging production line according to claim 5, characterized in that, The process of generating the master volume quality fingerprint includes: The physical installation distance of the sensor in the width direction of the master roll is used to obtain the current quality data, and this physical installation distance is determined as the horizontal coordinate. The vertical physical coordinates after calibration at the current sampling time are determined as the vertical coordinates; The quality data is written into a two-dimensional matrix node or database record row determined by the horizontal coordinate and the vertical coordinate to obtain a parent volume quality fingerprint map containing spatiotemporal data.

7. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The steps for generating the topological mapping relationship include: Obtain the spacing data of the slitting tool set in the width direction of the master roll; Based on the arrangement spacing data, a unique sub-volume identifier is assigned to each sub-volume generated by the splitting, and the horizontal coordinate interval corresponding to each sub-volume identifier in the parent volume's two-dimensional coordinate system is defined. A topology mapping table is established with the sub-volume identifier as the index key and the horizontal coordinate interval as the index value.

8. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The step of calibrating the longitudinal coordinates of the sub-volume quality archives using cumulative error includes: The process involves obtaining the target anchor point marker and its reference position during the rewinding process; obtaining the reference position of the previously identified anchor point marker and calculating the difference between them to obtain the theoretical physical distance; and calculating the measured running distance between the target anchor point marker and the previous anchor point marker. Calculate the ratio of the theoretical physical distance to the measured running distance to obtain the linear scaling factor; use the linear scaling factor to perform multiplication correction on the longitudinal coordinates of data points located between the target anchor point and the preceding anchor point in the sub-volume quality archive, and perform overall position alignment of the corrected longitudinal coordinates based on the reference position of the target anchor point.

9. The method for tracing quality data across multiple processes in the packaging production line according to claim 1, characterized in that, The steps for achieving reverse traceability from the finished sub-roll to the original quality data of the master roll include: Receive a query request, the query request including the target subvolume identifier and the relative position value of the defect point on the subvolume; Retrieve the vertical coordinate corresponding to the relative position value in the calibrated sub-volume quality archive; use the topology mapping table to convert the target sub-volume identifier into the horizontal coordinate range of the parent volume; use the vertical coordinate and the horizontal coordinate range as a joint index condition to retrieve and output the corresponding original quality parameters in the parent volume quality fingerprint map.

10. A multi-process quality data traceability system for packaging production lines, characterized in that, include: processor; A memory, wherein a computer program is stored; When the processor is configured to execute the computer program, it implements the multi-process quality data traceability method in the packaging production line as described in any one of claims 1 to 9.

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