Test method for water vapor barrier of air suspension nylon tubing

Abstract

This invention relates to the field of barrier testing technology, and more particularly to a method for testing the water vapor barrier properties of nylon tubing for air suspension systems. The method includes: determining a sampling method based on the production volume and production sequence of the same batch of nylon tubing to select several test nylon tubings, which are then divided into several sampling test groups; conducting standard experiments on the control test group to determine standard experimental data and quality standard characterization trends; conducting adjustment experiments on the test groups to determine adjustment experimental data and quality adjustment characterization trends; determining the quality characterization status of the corresponding batch of nylon tubing based on the judgment results of the quality standard characterization trends and quality adjustment characterization trends; determining the water vapor barrier performance of the nylon tubing based on the standard experimental data and adjustment experimental data; and predicting the testing time for the nylon tubing of this production batch during use based on the quality characterization status and water vapor barrier performance. This invention helps in advance planning for maintenance and ensuring the reliable operation of air suspension systems.

Description

Technical Field

[0001] This invention relates to the field of barrier testing technology, and in particular to a method for testing the water vapor barrier properties of an air suspension nylon tube. Background Technology

[0002] Air suspension systems play an increasingly important role in improving vehicle comfort and handling stability. As a key component of air suspension, the quality and performance of nylon tubing directly affect the overall system's performance. On the one hand, as automotive manufacturing moves towards higher precision and quality, the requirements for quality indicators such as the water vapor barrier performance of nylon tubing are becoming increasingly stringent, and traditional, simple, and crude sampling inspection methods can no longer meet the demands. On the other hand, in complex and ever-changing real-world operating environments, nylon tubing may be affected by various factors such as temperature, pressure, and vibration, leading to changes in its performance. Therefore, there is an urgent need for a testing technology that can simulate different operating conditions, comprehensively evaluate performance, and guide subsequent maintenance.

[0003] Chinese Patent Publication No. CN118190746A discloses a water vapor barrier performance testing system and method based on differential pressure method, relating to the field of water vapor barrier performance testing technology. It includes a collection module for collecting and processing operational data from the testing equipment; an analysis module for calculating and analyzing the processed operational data, determining the state of the testing equipment during vacuum operation, and calculating the water vapor transmission rate of the test sample; and a control module for controlling the testing equipment and displaying all data to assist personnel in managing the testing equipment. This invention uses the differential pressure method to perform a two-layer test of dry and humid elemental gases and calculates the difference to determine the water vapor barrier performance of the sample. It also maintains real-time monitoring of the testing equipment's state during vacuum operation, avoiding test result errors caused by improper vacuum operation and effectively improving the accuracy of test data. However, this invention has the following problems:

[0004] The difficulties in quality control caused by the diversity of production batches and operating conditions, as well as the failure to assess the testing time, were not taken into account. Summary of the Invention

[0005] Therefore, this invention provides a water vapor barrier test method for air suspension nylon tubes to overcome the problems in the prior art, such as difficulty in quality control, lack of performance evaluation methods, and blind use and maintenance caused by complex production batches, diverse working conditions, and lack of maintenance data, so as to ensure that the nylon tubes are of reliable quality, meet performance standards, and reasonably plan maintenance time.

[0006] To achieve the above objectives, the present invention provides a method for testing the water vapor barrier properties of nylon tubing in air suspension systems, comprising:

[0007] The sampling method is determined based on the production volume and production sequence of the same production batch of nylon tubing, and a number of nylon tubing are selected for testing according to the sampling method.

[0008] The nylon tube to be tested is divided into several sampling test groups, and each sampling test group includes at least one control test group and one experimental test group.

[0009] Each test nylon tube in the control test group is subjected to standard experiments to determine its standard experimental data, and the quality standard characterization trend is determined based on the standard experimental data of each test nylon tube. The quality standard characterization trend includes a quality consistency trend and a quality variation trend.

[0010] Each nylon tube in the experimental testing group was subjected to adjustment experiments to determine its adjustment experimental data, and the quality adjustment characterization trend was determined based on the adjustment experimental data of each nylon tube. The quality adjustment characterization trend includes a quality consistency trend and a quality variation trend.

[0011] The quality characterization status of the corresponding batch of nylon tubing is determined based on the judgment results of the quality standard characterization trend and the quality adjustment characterization trend. The quality characterization status includes a stable state, an obvious fluctuation state, and an implicit fluctuation state.

[0012] The water vapor barrier performance of the nylon tube is determined based on the quality characterization status, the standard experimental data, and the adjusted experimental data.

[0013] The testing time for this batch of nylon tubing during use is predicted based on its quality characterization status and water vapor barrier performance.

[0014] Furthermore, methods for determining sampling methods based on the production volume and production sequence of the same production batch of nylon tubing include:

[0015] The number of nylon tubes to be tested is determined based on the production volume and the preset sampling ratio.

[0016] The number of sampling time nodes is determined based on the sampling quantity and the number of sampling inspection groups.

[0017] Several sampling time nodes are determined based on the number of nodes and the production sequence;

[0018] At each sampling time point, a number of nylon tubes for testing were randomly selected from the sampling test groups.

[0019] Furthermore, the method for conducting standard tests on each test nylon tube in the control test group includes:

[0020] The test nylon tubes of the control group were divided into a first control group and a second control group according to a preset grouping ratio.

[0021] In the first control group, a humidity sensor was installed inside each nylon tube and filled with a standard weight of resin, and the standard initial humidity inside each nylon tube was determined.

[0022] In the second control group, a humidity sensor was installed inside each nylon tube and filled with a standard weight of silica gel. The standard initial humidity and standard initial silica gel color value inside each nylon tube were determined.

[0023] The nylon tube was placed in a standard experimental environment, which was an ambient temperature of 40°C and an ambient relative humidity of 90%.

[0024] The experiment of the second control group was completed at the first preset time, and the standard change silica gel color value of each test nylon tube in the second control group was determined, as well as the first standard humidity of each test nylon tube in the control test group was determined.

[0025] The experiment of the first control group was completed at the second preset time, and the second standard humidity and standard end resin weight of each test nylon tube in the first control group were determined.

[0026] Wherein, the preset grouping ratio is greater than or equal to 1:1;

[0027] The standard experimental data include standard initial humidity, first standard humidity, second standard humidity, standard initial silica gel color value, standard changed silica gel color value, and standard final resin weight.

[0028] Furthermore, the method for determining the quality standard characterization trend based on the standard test data of each tested nylon tube includes,

[0029] The difference between the first standard humidity and the first standard humidity for each tested nylon tube is determined to determine the standard deviation of the first standard humidity;

[0030] The standard deviation of the standard colorimetric value is determined based on the standard variation of the silicone colorimetric value of each tested nylon tube;

[0031] The standard absorbent weight is determined based on the standard weight and standard end resin weight of each tested nylon tube, and the standard deviation of the standard absorbent weight of each tested nylon tube is then determined.

[0032] The quality standard characterization trend is determined based on the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight, wherein...

[0033] If the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight meet the standard consistency condition, then the quality standard characterization trend is determined to be a quality consistency trend.

[0034] If the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight do not meet the standard consistency condition, then the quality standard characterization trend is determined to be a quality inconsistency trend.

[0035] The standard consistency condition is that the difference rate between any two of the standard deviation parameters among the first standard humidity standard deviation, the standard color value standard deviation, and the standard water absorption weight standard deviation is less than a preset value.

[0036] Furthermore, the method for adjusting the various nylon tubes in the experimental testing group includes:

[0037] The nylon tubes in the experimental testing group were divided into the first experimental group and the second experimental group according to the preset grouping ratio.

[0038] In the first experimental group, humidity sensors were installed inside each nylon tube and filled with a standard weight of resin, and the initial humidity inside each nylon tube was determined.

[0039] In the second experimental group, humidity sensors were installed inside each nylon tube and filled with a standard weight of silica gel. The initial humidity and initial silica gel color value inside each nylon tube were also determined.

[0040] The nylon tube is placed in an conditioned experimental environment, which includes a standard experimental environment and periodic pressure changes;

[0041] The experiment of the second experimental group was completed at the first preset time, and the adjusted change silica gel color value of each detection nylon tube in the second experimental group was determined, as well as the first adjusted humidity of each detection nylon tube in the second experimental group was determined.

[0042] The experiment of the first experimental group was completed at the second preset time, and the second adjusted humidity and the resin weight at the end of the adjustment were determined for each nylon tube in the first experimental group.

[0043] The adjusted experimental data includes adjusting the initial humidity, the first adjusted humidity, the second adjusted humidity, adjusting the initial silica gel color value, adjusting the changed silica gel color value, and adjusting the final resin weight.

[0044] Furthermore, the method for determining the quality adjustment characterization trend based on the adjustment experimental data of each tested nylon tube includes,

[0045] The difference in the first adjusted humidity of each nylon tube is determined by comparing the initial adjusted humidity with the first adjusted humidity, and then the standard deviation of the first adjusted humidity is determined.

[0046] The standard deviation of the adjusted colorimetric value is determined based on the adjusted colorimetric value of the silicone rubber described for each nylon tube being tested;

[0047] The adjusted water absorption weight is determined based on the standard weight of each tested nylon tube and the final resin weight to determine the standard deviation of the adjusted water absorption weight of each tested nylon tube;

[0048] The quality adjustment characterization trend is determined based on the first adjusted humidity standard deviation, the adjusted color value standard deviation, and the adjusted water absorption weight standard deviation, wherein...

[0049] If the first standard deviation of adjusted humidity, the standard deviation of adjusted color value, and the standard deviation of adjusted water absorption weight meet the adjustment consistency condition, then the quality adjustment characteristic trend is determined to be a quality consistency trend.

[0050] If the first standard deviation of humidity adjustment, the standard deviation of color value adjustment, and the standard deviation of water absorption weight adjustment do not meet the adjustment consistency condition, then the quality adjustment characteristic trend is determined to be a quality inconsistency trend.

[0051] The adjustment consistency condition is that the difference rate between any two of the standard deviation parameters among the first adjusted humidity standard deviation, the adjusted color value standard deviation, and the adjusted water absorption weight standard deviation is less than a preset value.

[0052] Further, the quality characterization status of the corresponding batch of nylon tubing is determined based on the judgment results of the quality standard characterization trend and the quality adjustment characterization trend, including:

[0053] If both the quality characterization trend and the quality characterization trend are consistent trends, then the quality characterization status of the corresponding batch of nylon tubes is determined to be a stable state.

[0054] If both the quality characterization trend and the quality characterization trend are quality variation trends, then the quality characterization status of the corresponding batch of nylon tubes is determined to be an obvious fluctuation state.

[0055] If the quality characterization trend is different from the quality characterization trend, then the quality characterization status of the corresponding batch of nylon tubes is determined to be a latent fluctuation state.

[0056] Furthermore, the method for determining the water vapor barrier performance of nylon tubes based on the standard experimental data and the adjusted experimental data includes,

[0057] The standard water absorption rate of each tested nylon tube is determined based on the ratio of the standard water absorption weight to the standard weight.

[0058] The adjusted water absorption rate of each nylon tube is determined based on the ratio of the adjusted water absorption weight to the standard weight.

[0059] The average standard water absorption rate and the average adjusted water absorption rate are determined based on the standard water absorption rate and the adjusted water absorption rate, respectively.

[0060] The water vapor barrier performance of the nylon tube is determined based on the average standard water absorption rate and the average adjusted water absorption rate.

[0061] Furthermore, the water vapor barrier performance is positively correlated with the ratio of the average standard water absorption rate to the average adjusted water absorption rate, wherein,

[0062] If the ratio of the average value of the standard water absorption rate to the average value of the corresponding adjusted water absorption rate is less than the reference value, then the water vapor barrier performance is determined to be non-compliant with the standard.

[0063] If the ratio of the average value of the standard water absorption rate to the average value of the corresponding adjusted water absorption rate is greater than or equal to the reference value, then the water vapor barrier performance is determined to meet the standard.

[0064] Furthermore, based on the quality characterization status and water vapor barrier performance, the testing time for this batch of nylon tubing during use is predicted, including...

[0065] If the quality characterization state is stable and the water vapor barrier performance meets the standard, then the testing time of the nylon tubes in this production batch during use is determined to be the standard testing time.

[0066] If the quality characterization state is a latent fluctuation state and the water vapor barrier performance meets the standard, then it is determined that the testing time of the nylon tubes in this production batch is less than the standard testing time during use.

[0067] If the quality characterization state is an overtly fluctuating state, or if the quality characterization state is a covertly fluctuating state and the water vapor barrier performance does not meet the standard, then it is determined that the nylon tubes from this production batch will not be used.

[0068] Compared with existing technologies, the beneficial effects of this invention are as follows: The water vapor barrier test method for air suspension nylon tubes provided by this invention uses a reasonable sampling process. The sampling method is determined based on the production volume and sequence of the same production batch of nylon tubes, selecting representative nylon tubes for testing to ensure that the test results reflect the quality of the entire batch of products. Secondly, by setting up a control test group and an experimental test group, it is possible to accurately determine the standard experimental data and quality characterization trends, and also to compare and derive the adjusted experimental data and corresponding trends, providing a multi-dimensional basis for comprehensively judging product quality. Furthermore, it can accurately determine the quality characterization status of the corresponding batch of nylon tubes based on the experimental results, covering stable, overt fluctuations, and latent fluctuations, allowing producers to clearly understand the product quality fluctuations. Finally, by combining standard and adjusted experimental data to determine the water vapor barrier performance, and based on the quality characterization status and this performance, it can predict the testing time of the nylon tubes during use, which helps to plan maintenance in advance and ensure the reliable operation of the air suspension system.

[0069] Furthermore, this invention employs a rigorous, scientific, and highly targeted sampling strategy that fully considers the scale differences of production batches, the setup of testing groups, and the continuity of the production process. This ensures that the extracted samples can accurately reflect the overall quality of the entire batch of nylon tubes and are closely connected with subsequent experimental steps, laying a solid foundation for the accuracy and reliability of the entire test.

[0070] Furthermore, this invention constructs a clear and accurate quality status judgment criterion by conducting a rigorous and detailed comparative analysis of the quality standard characterization trend and the quality adjustment characterization trend. It can present the quality fluctuation of nylon tube batches in three intuitive states: stable, obvious fluctuation, and hidden fluctuation, providing a core basis for producers to quickly and accurately grasp product quality.

[0071] Furthermore, based on a rigorous and scientific experimental data processing procedure, this invention constructs a precise evaluation system for the water vapor barrier performance of nylon tubes by calculating the standard water absorption rate and the adjusted water absorption rate separately, and by comprehensively considering the average value of the two and comparing it with the reference value. This provides key support for accurately judging the quality of nylon tubes and controlling product performance.

[0072] Furthermore, this invention integrates two key indicators—quality characterization status and water vapor barrier performance—to construct a predictive mechanism for the usage and testing time of nylon tubes that fits actual application scenarios. This mechanism can accurately guide the reasonable use and maintenance of nylon tubes under different quality conditions, effectively ensure the overall reliability and safety of the air suspension system, and avoid the risk of failure caused by nylon tube problems. Attached Figure Description

[0073] Figure 1 This is a step diagram of the water vapor barrier test method for air suspension nylon tubing according to an embodiment of the present invention;

[0074] Figure 2 This is a flowchart illustrating the steps of determining the sampling method in an embodiment of the present invention.

[0075] Figure 3 A flowchart illustrating the water vapor barrier performance of nylon tubes in an embodiment of the present invention;

[0076] Figure 4 This is a flowchart illustrating the prediction of the detection time for nylon tubes during use, as described in an embodiment of the present invention. Detailed Implementation

[0077] 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.

[0078] 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.

[0079] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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.

[0080] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] Please see Figure 1 The diagram shows the steps of a water vapor barrier test method for air suspension nylon tubing according to an embodiment of the present invention. This embodiment of the present invention provides a water vapor barrier test method for air suspension nylon tubing, including:

[0082] Step S1: Determine the sampling method based on the production volume and production sequence of the same production batch of nylon tubes, and select a number of nylon tubes for testing according to the sampling method.

[0083] Step S2: Divide the nylon tubes to be tested into several sampling test groups. Each sampling test group includes at least one control test group and one experimental test group. It is understood that the number of nylon tubes to be tested in each sampling test group is equal.

[0084] Step S3: Perform standard experiments on each test nylon tube in the control test group to determine its standard experimental data, and determine the quality standard characterization trend based on the standard experimental data of each test nylon tube. The quality standard characterization trend includes a quality consistency trend and a quality variation trend.

[0085] Step S4: Perform adjustment experiments on each test nylon tube in the experimental testing group to determine its adjustment experiment data, and determine the quality adjustment characterization trend based on the adjustment experiment data of each test nylon tube. The quality adjustment characterization trend includes a quality consistency trend and a quality variation trend.

[0086] Step S5: Determine the quality characterization status of the corresponding batch of nylon tubing based on the judgment results of the quality standard characterization trend and the quality adjustment characterization trend. The quality characterization status includes a stable state, an overt fluctuation state, and a covert fluctuation state.

[0087] Step S6: Determine the water vapor barrier performance of the nylon tube based on the standard experimental data and the adjusted experimental data;

[0088] Step S7: Predict the testing time for the nylon tubes of this production batch during use based on the quality characterization status and water vapor barrier performance.

[0089] Understandably, this invention selects nylon tubes for testing based on production volume and sequence to avoid randomness and bias in sampling. This ensures that the selected samples reflect the true quality level of the entire batch of nylon tubes to the greatest extent possible, making subsequent test results more convincing. The grouping pattern of the control group and the experimental group establishes a standard experimental data benchmark and allows for a direct comparison of the differences brought about by the adjusted experiments. This clearly demonstrates the quality performance of nylon tubes under different experimental conditions, facilitating the rapid identification of potential problems. By comparing the trends characterized by quality standards and the trends characterized by quality adjustments, the quality status of nylon tubes is refined into stable, overt fluctuations, and latent fluctuations. Producers can quickly understand the product quality stability and adjust production processes in a timely manner. By comprehensively analyzing experimental data to determine water vapor barrier performance and predicting the testing time during use based on the quality characterization status, this invention not only controls the current product quality but also provides forward-looking guidance for subsequent use and maintenance, reducing usage risks, extending product lifespan, and improving the overall performance and safety of the air suspension.

[0090] Please see Figure 2 The diagram illustrates the steps of determining a sampling method according to an embodiment of the present invention. Specifically, in step S1, the method for determining the sampling method based on the production volume and production sequence of the same production batch of nylon tubing includes:

[0091] Step S11: Determine the sampling quantity of nylon tubes to be tested based on the production volume and the preset sampling ratio. It is understood that the preset sampling ratio is typically 1 / 100 to 1 / 1000, and the larger the production volume of a single production batch, the smaller the preset sampling ratio. In practice, the preset sampling ratio is 1 / 100 when the production volume is ≤10000, and 1 / 1000 when the production volume is >10000. This dynamic setting method, which flexibly adjusts the preset sampling ratio according to the production volume, ensures a sufficient number of samples for testing during small-scale production to accurately capture potential quality problems. It also avoids resource waste caused by over-sampling during large-scale production, while ensuring that the samples remain representative, thus achieving the best balance between sampling costs and testing effectiveness.

[0092] In practice, the sampling quantity = preset sampling ratio × production quantity;

[0093] Step S12: Determine the number of sampling time nodes based on the sampling quantity and the number of sampling test groups; in practice, the number of nodes = sampling quantity ÷ number of sampling test groups; it is understood that the number of sampling test groups is ≥2 groups, that is, at least one control test group and one experimental test group; it is understood that the number of sampling test groups is determined before the water vapor barrier performance test of the nylon tube, and is usually two sampling test groups;

[0094] Step S13: Determine several sampling time nodes sequentially based on the number of nodes and the production sequence;

[0095] It is understandable that the time interval between any two adjacent sampling time points can be equal or unequal, as long as any time point can be selected within the same batch.

[0096] In practice, the time interval between any two adjacent sampling time points is usually equal to ensure that all nylon tubes in the production batch are sampled and tested from beginning to end, thus increasing the representativeness of the sampling and testing.

[0097] By combining the number of samples and the number of sampling inspection groups to determine the number of sampling time nodes, it is ensured that nylon tubes produced at different times have the opportunity to be included in the sample. This effectively avoids missing quality fluctuations caused by phased factors in the production process (such as changes in raw material batches, restarting equipment after temporary malfunctions, etc.), and ensures that the sampling fully covers the entire production process. In the implementation process, the time interval between any two adjacent sampling time nodes is usually made equal to ensure that all nylon tubes in the production batch are sampled and inspected from beginning to end. In this way, whether it is the product in the early stage of production when the process is not yet fully stable or the product in the middle and later stages when it is approaching maturity, it can be sampled evenly, covering nylon tubes in the entire production stage to the greatest extent. This greatly enhances the representativeness of the sampling inspection and allows the final test results to truly reflect the quality status of the entire batch of nylon tubes at different production periods.

[0098] Step S14: At each sampling time point, the number of nylon tubes for the sampling test group is extracted.

[0099] Understandably, sampling nylon tubes for each sampling test group are drawn according to the sampling time points, so that the sampling step is seamlessly connected with the subsequent group experiment. The drawn samples can be directly matched with the groups for control and experimental testing, avoiding sample confusion or mismatch, reducing coordination costs in the intermediate links, improving the execution efficiency of the entire testing process, and creating favorable conditions for the rapid and accurate acquisition of experimental data in the future.

[0100] It is understood that step S3 includes steps S31 and S32. Step S31 involves conducting standard experiments on each test nylon tube in the control test group, and step S32 involves determining the quality standard characterization trend based on the standard experiment data of each test nylon tube.

[0101] Specifically, in step S31, the method for conducting standard tests on each test nylon tube in the control test group includes:

[0102] Step S311: Divide the test nylon tubes of the control test group into a first control group and a second control group according to a preset grouping ratio. It is understood that since the first control group needs to conduct a long-term experiment, while the second control group does not need to conduct a long-term experiment, the number of test nylon tubes in the first control group is greater than or equal to the number of test nylon tubes in the second control group. The preset ratio is usually 1:1 to 3:1.

[0103] Step S312: In the first control group, a humidity sensor is installed inside each nylon tube and filled with a standard weight of resin, and the standard initial humidity inside each nylon tube is determined.

[0104] Step S313: In the second control group, a humidity sensor is installed inside each of the nylon tubes and filled with a standard weight of silica gel, and the standard initial humidity and standard initial silica gel color value inside each nylon tube are determined.

[0105] Step S314: Place the test nylon tube in a standard experimental environment, wherein the standard experimental environment is an ambient temperature of 40°C and an ambient relative humidity of 90%.

[0106] Step S315: End the experiment of the second control group at the first preset time and determine the standard change silica gel color value of each test nylon tube in the second control group, and determine the first standard humidity of each test nylon tube in the control test group.

[0107] Step S316: End the experiment of the first control group at the second preset time and determine the second standard humidity and standard end resin weight of each test nylon tube in the first control group.

[0108] Wherein, the preset grouping ratio is greater than or equal to 1:1;

[0109] The standard experimental data include standard initial humidity, first standard humidity, second standard humidity, standard initial silica gel color value, standard changed silica gel color value, and standard final resin weight.

[0110] It is understandable that when determining the chromaticity value of silicone, images of the silicone are taken around the perimeter, and the chromaticity value of each pixel within the perimeter image is determined. The standard initial silicone chromaticity value and the standard variable silicone chromaticity value are then determined based on the average chromaticity value of each pixel.

[0111] In practice, the first preset time is less than the second preset time; typically, the first preset time is between 48h and 120h, and the second preset time is greater than 1500h; preferably, the first preset time is set to 72h, and the second preset time is set to 2000h.

[0112] In practice, the chromaticity value of a single pixel is the sum of the corresponding values ​​of the red, green, and blue channels of that pixel.

[0113] Specifically, in step S32, the method for determining the quality standard characterization trend based on the standard test data of each tested nylon tube includes,

[0114] Step S321: Determine the first standard humidity difference for each tested nylon tube based on the standard initial humidity and the first standard humidity to determine the standard deviation of the first standard humidity; it can be understood that the first standard humidity difference = first standard humidity - corresponding standard initial humidity; then determine the standard deviation of the first standard humidity based on the standard deviation of the first standard humidity difference for each nylon tube.

[0115] Step S322: Determine the standard deviation of the standard colorimetric value based on the standard variation silica gel colorimetric value of each tested nylon tube; it can be understood that the standard deviation of the standard colorimetric value is the standard deviation of the standard variation silica gel colorimetric value of each nylon tube.

[0116] Step S323: Determine the standard absorbent weight based on the standard weight and standard final resin weight of each tested nylon tube to determine the standard deviation of the standard absorbent weight of each tested nylon tube; it can be understood that the standard absorbent weight = standard final resin weight - standard weight; the standard deviation of the standard absorbent weight is the standard deviation of the standard absorbent weight of each nylon tube.

[0117] Step S324: Determine the quality standard characterization trend based on the first standard humidity standard deviation, the standard color value standard deviation, and the standard water absorption weight standard deviation, wherein...

[0118] If the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight meet the standard consistency condition, then the quality standard characterization trend is determined to be a quality consistency trend.

[0119] If the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight do not meet the standard consistency condition, then the quality standard characterization trend is determined to be a quality inconsistency trend.

[0120] The standard consistency condition is that the difference rate between any two of the standard deviation parameters among the first standard humidity standard deviation, the standard color value standard deviation, and the standard water absorption weight standard deviation is less than a preset value.

[0121] It is understandable that the difference rate between any two standard deviation parameters includes: (1) the difference rate a12 between the first standard humidity standard deviation a1 and the standard color value standard deviation a2, a12=|a1-a2|÷a1×100% or a12=|a1-a2|÷a2×100%, if a1 is less than a2 then a12=|a1-a2|÷a1×100%, if a1 is greater than a2 then a12=|a1-a2|÷a2×100%; (2) the difference rate a23 between the standard color value standard deviation a2 and the standard water absorption weight standard deviation a3, a23=|a2-a3|÷a2×100% or a 23 = |a2-a3|÷a3×100%, if a2 is less than a3 then a23 = |a2-a3|÷a2×100%, if a2 is greater than a3 then a23 = |a2-a3|÷a3×100%; (3) the difference rate a13 between the first standard humidity standard deviation a1 and the standard water absorption weight standard deviation a3, a13 = |a1-a3|÷a1×100% or a13 = |a1-a3|÷a3×100%, if a1 is less than a3 then a13 = |a1-a3|÷a1×100%, if a1 is greater than a3 then a13 = |a1-a3|÷a3×100%;

[0122] In practice, a smaller preset value means a smaller difference rate between any two standard deviation parameters, which means that the quality of the batch of nylon tubes is more consistent; usually, the preset value is ∈ [1%, 5%].

[0123] It is understood that step S4 includes steps S41 and S42. Step S41 is to conduct adjustment experiments on each of the test nylon tubes in the experimental test group, and step S42 is to determine the quality adjustment characterization trend based on the adjustment experiment data of each test nylon tube.

[0124] Specifically, in step S41, the method for adjusting the nylon tubes of the experimental detection group includes:

[0125] Step S411: Divide the test nylon tubes of the experimental test group into the first experimental group and the second experimental group according to the preset grouping ratio.

[0126] Step S412: In the first experimental group, a humidity sensor is installed inside each nylon tube and filled with a standard weight of resin, and the initial humidity inside each nylon tube is determined.

[0127] Step S413: In the second experimental group, a humidity sensor is installed inside each nylon tube and filled with a standard weight of silica gel, and the initial humidity and initial silica gel color value inside each nylon tube are determined.

[0128] Step S414: Place the nylon tube under test in an adjusted experimental environment, which includes a standard experimental environment and periodic pressure changes. It is understood that the purpose of adding periodic pressure changes is to consider the fatigue performance and sealing performance of the nylon tube under fatigue. Therefore, the pressure change range should include its normal operating pressure and the extreme pressures that may be encountered (20%–30% above and below the operating pressure). In practice, the periodic pressure changes are typically set as follows: no pressure – low pressure – medium pressure – high pressure – no pressure – low pressure – medium pressure – high pressure – no pressure… A typical cycle (the process of no pressure – low pressure – medium pressure – high pressure) lasts 4–6 hours, with the no-pressure period accounting for half (i.e., 2–3 hours), and the durations of low pressure, medium pressure, and high pressure being equal (the sum of the durations of the three pressure stages equals the duration of no pressure).

[0129] In implementation, it is necessary to obtain the design ultimate pressure value of the nylon tube and the normal working pressure value of its application scenario, and determine the pressure corresponding to low pressure, medium pressure and high pressure accordingly; the pressure of low pressure is 50% to 70% of the normal working pressure, the pressure of medium pressure is 80% to 120% of the normal working pressure, and the pressure of high pressure is 90% to 110% of the design ultimate pressure value.

[0130] Step S415: End the experiment of the second experimental group at the first preset time and determine the adjusted change silica gel color value of each detection nylon tube in the second experimental group, and determine the first adjusted humidity of each detection nylon tube in the second experimental group.

[0131] Step S416: End the experiment of the first experimental group at the second preset time and determine the second adjusted humidity and the adjusted resin weight of each nylon tube in the first experimental group.

[0132] The adjusted experimental data includes adjusting the initial humidity, the first adjusted humidity, the second adjusted humidity, adjusting the initial silica gel color value, adjusting the changed silica gel color value, and adjusting the final resin weight.

[0133] Understandably, the adjusted experiment added the effect of pressure on the nylon tube to the standard experiment in order to accelerate the fatigue state of the nylon tube and determine the water vapor barrier performance of the nylon tube in the fatigue state.

[0134] Specifically, in step S42, the method for determining the quality adjustment characterization trend based on the adjustment experimental data of each tested nylon tube includes,

[0135] Step S421: Determine the difference in first adjusted humidity for each detection nylon tube based on the initial adjusted humidity and the first adjusted humidity to determine the standard deviation of the first adjusted humidity;

[0136] Step S422: Determine the standard deviation of the adjusted colorimetric value based on the adjusted colorimetric value of the silicone rubber in each tested nylon tube;

[0137] Step S423: Determine the adjusted water absorption weight based on the standard weight of each tested nylon tube and the final resin weight to determine the standard deviation of the adjusted water absorption weight of each tested nylon tube.

[0138] Step S424: Determine the quality adjustment characterization trend based on the first adjusted humidity standard deviation, the adjusted color value standard deviation, and the adjusted water absorption weight standard deviation, wherein...

[0139] If the first standard deviation of adjusted humidity, the standard deviation of adjusted color value, and the standard deviation of adjusted water absorption weight meet the adjustment consistency condition, then the quality adjustment characteristic trend is determined to be a quality consistency trend.

[0140] If the first standard deviation of humidity adjustment, the standard deviation of color value adjustment, and the standard deviation of water absorption weight adjustment do not meet the adjustment consistency condition, then the quality adjustment characteristic trend is determined to be a quality inconsistency trend.

[0141] The adjustment consistency condition is that the difference rate between any two of the standard deviation parameters among the first adjusted humidity standard deviation, the adjusted color value standard deviation, and the adjusted water absorption weight standard deviation is less than a preset value.

[0142] It is understandable that the method for determining the trend of quality adjustment is the same as the method for determining the trend of quality standard, and the selection of preset values ​​is also the same.

[0143] Specifically, in step S5, the quality characterization status of the corresponding batch of nylon tubing is determined based on the judgment results of the quality standard characterization trend and the quality adjustment characterization trend, including:

[0144] If both the quality characterization trend and the quality characterization trend are consistent trends, then the quality characterization status of the corresponding batch of nylon tubes is determined to be a stable state. It can be understood that a stable state means that the product quality is stable under both normal and adjusted test conditions, the production process is reliable, there is no need to worry too much about quality variation, and it helps to stabilize the production process and make reasonable arrangements for subsequent production plans.

[0145] If both the quality characterization trend and the quality characterization trend are quality variation trends, then the quality characterization status of the corresponding batch of nylon tubes is determined to be a state of explicit fluctuation. It can be understood that if both show a quality variation trend, it is determined to be a state of explicit fluctuation. This indicates that there are significant fluctuations in product quality, and production personnel should be prompted to immediately trace the source to investigate whether it is a problem with raw materials, equipment failure, or process execution deviation, and take corrective measures in a timely manner to prevent the large-scale production of defective products and ensure the overall quality level of the products.

[0146] If the quality characterization trend and the quality adjustment characterization trend are different, the quality characterization status of the corresponding batch of nylon tubes is determined to be a latent fluctuation state. It can be understood that when the standard and quality adjustment characterization trends are different, it is determined to be a latent fluctuation state. This determination can keenly detect potential quality changes that are not easy to be directly discovered. Even if the product as a whole seems normal, subtle differences have been detected, reminding producers to pay attention to subtle changes in the production process, prevent large-scale quality problems that may occur in advance, and build a solid defense for continuous optimization of product quality.

[0147] Understandably, step S5 effectively integrates the quality information reflected under different experimental conditions, allowing producers to no longer face fragmented and vague data, but to have a comprehensive understanding of product quality dynamics based on clear quality characterization. From macro-production planning to micro-process adjustments, they can make accurate decisions and achieve strong control over the quality of nylon tubes.

[0148] Please see Figure 3 The diagram shows a flowchart illustrating the process of determining the water vapor barrier performance of a nylon tube according to an embodiment of the present invention. Specifically, in step S6, the method for determining the water vapor barrier performance of the nylon tube based on the standard experimental data and the adjusted experimental data includes:

[0149] Step S61: Determine the standard water absorption rate of each tested nylon tube based on the ratio of each standard water absorption weight to the standard weight;

[0150] Step S62: Determine the adjusted water absorption rate of each test nylon tube based on the ratio of each adjusted water absorption weight to the standard weight;

[0151] Understandably, by using steps S61 and S62, the standard water absorption rate is determined based on the ratio of each standard water absorption weight to the standard weight, and the adjusted water absorption rate is determined based on the ratio of each adjusted water absorption weight to the standard weight. This precise data processing method allows the degree of water vapor absorption of the nylon tube under different experimental conditions to be presented intuitively, laying a solid foundation for subsequent performance evaluation.

[0152] Step S63: Determine the average value of the standard water absorption rate and the average value of the adjusted water absorption rate based on the standard water absorption rate and the adjusted water absorption rate respectively. It can be understood that step S63 further calculates the average value based on the standard water absorption rate and the adjusted water absorption rate respectively, so as to avoid the one-sidedness of a single data and comprehensively reflect the water absorption characteristics of the entire set of tested nylon tubes. This allows the manufacturer to grasp the moisture absorption tendency of the product under normal and adjusted conditions from a macro perspective, and provides data basis for comparing different batches or optimizing the production process.

[0153] Step S64: Determine the water vapor barrier performance of the nylon tube based on the average standard water absorption rate and the average adjusted water absorption rate. It can be understood that in step S64, the ratio of the average standard water absorption rate to the average adjusted water absorption rate is compared with a reference value to clearly determine whether the water vapor barrier performance meets the standard. This clear determination rule allows manufacturers to quickly and accurately know whether the product performance meets the standard. When the ratio is less than the reference value, problems can be detected and improved in a timely manner; when it is greater than or equal to the reference value, the product performance is confirmed to be reliable, ensuring the high quality of the nylon tubes put into use.

[0154] Specifically, in step S64, the water vapor barrier performance is positively correlated with the ratio of the average standard water absorption rate to the average adjusted water absorption rate, wherein,

[0155] If the ratio of the average value of the standard water absorption rate to the average value of the corresponding adjusted water absorption rate is less than the reference value, then the water vapor barrier performance is determined to be non-compliant with the standard.

[0156] If the ratio of the average value of the standard water absorption rate to the average value of the corresponding adjusted water absorption rate is greater than or equal to the reference value, then the water vapor barrier performance is determined to meet the standard.

[0157] It is understandable that the average standard water absorption rate is less than or equal to the average adjusted water absorption rate. The larger the ratio of the average standard water absorption rate to the average adjusted water absorption rate, the closer the two values ​​are, indicating that the nylon tube has better water vapor barrier performance under fatigue conditions, which means that the batch of nylon tubes has better water vapor barrier performance.

[0158] In practice, the reference value is ∈ [0.7, 0.85]. The larger the reference value, the better the water vapor barrier performance is judged.

[0159] Please see Figure 4 The diagram shows a flowchart illustrating the prediction of the testing time for nylon tubing during use, according to an embodiment of the present invention. Specifically, in step S7, the testing time for the nylon tubing of this production batch during use is predicted based on the quality characterization status and water vapor barrier performance, including...

[0160] If the quality characterization state is stable and the water vapor barrier performance meets the standard, then the testing time of the nylon tubes in this production batch during use is determined to be the standard testing time.

[0161] If the quality characterization state is a latent fluctuation state and the water vapor barrier performance meets the standard, or if the quality characterization state is a stable state and the water vapor barrier performance does not meet the standard, it means that the nylon tubes of this production batch may not have the performance of the nylon tubes determined in the design stage. Therefore, it is determined that the testing time of the nylon tubes of this production batch is less than the standard testing time during use. It is understood that the testing time is usually 0.7 times to 0.9 times the standard testing time.

[0162] Understandably, this range (0.7 times to 0.9 times the standard testing time) is more appropriate than maintaining the product according to the standard testing time. Early intervention in testing can detect potential problems before obvious failures occur. It does not excessively compress the testing time, avoiding the waste of manpower and resources caused by overly frequent testing. At the same time, it does not completely follow the regular interval, but appropriately increases the frequency of attention to nylon tubes with potential hidden dangers.

[0163] If the quality characterization status is an overtly fluctuating state, or if the quality characterization status is an undertook latently fluctuating state and the water vapor barrier performance does not meet the standard, then it is determined that the nylon tubing from this production batch will not be used. In practice, it can be used in stages in places where the water vapor barrier performance requirements are not high. This screening mechanism prevents inferior nylon tubing from entering key application scenarios from the source, ensuring the operational safety of high-requirement parts such as automotive air suspension. At the same time, it rationally arranges the disposal of products that still have some utilization value, avoiding resource waste and maximizing benefits.

[0164] Understandably, when nylon tubing is used in automotive air suspension, a recommended maintenance interval (i.e., standard inspection interval) is usually established, and this maintenance interval is determined during the nylon tubing's production and design phase.

[0165] Understandably, this comprehensive judgment process in step S7 closely links the quality information of the nylon tube with actual use and maintenance. Users no longer blindly follow fixed maintenance patterns, but dynamically and flexibly adjust the testing strategy based on the actual quality of the product. This not only improves the performance of the nylon tube itself, but also safeguards the stable and reliable operation of the air suspension and even the entire vehicle system, enhancing the overall competitiveness of the product.

[0166] 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.

[0167] 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 test method for water vapor barrier properties of nylon tubing in air suspension systems, characterized in that, include: The sampling method is determined based on the production volume and production sequence of the same production batch of nylon tubing, and a number of nylon tubing are selected for testing according to the sampling method. The nylon tube to be tested is divided into several sampling test groups, and each sampling test group includes at least one control test group and one experimental test group. Each test nylon tube in the control test group is subjected to standard experiments to determine its standard experimental data, and the quality standard characterization trend is determined based on the standard experimental data of each test nylon tube. The quality standard characterization trend includes a quality consistency trend and a quality variation trend. Each nylon tube in the experimental testing group was subjected to adjustment experiments to determine its adjustment experimental data, and the quality adjustment characterization trend was determined based on the adjustment experimental data of each nylon tube. The quality adjustment characterization trend includes a quality consistency trend and a quality variation trend. The quality characterization status of the corresponding batch of nylon tubing is determined based on the judgment results of the quality standard characterization trend and the quality adjustment characterization trend. The quality characterization status includes a stable state, an obvious fluctuation state, and an implicit fluctuation state. The water vapor barrier performance of the nylon tube was determined based on the standard experimental data and the adjusted experimental data. Predict the testing time for this batch of nylon tubing during use based on its quality characterization status and water vapor barrier performance. The method for adjusting the various nylon tubes in the experimental testing group includes: The nylon tubes in the experimental testing group were divided into the first experimental group and the second experimental group according to the preset grouping ratio. In the first experimental group, humidity sensors were installed inside each nylon tube and filled with a standard weight of resin, and the initial humidity inside each nylon tube was determined. In the second experimental group, humidity sensors were installed inside each nylon tube and filled with a standard weight of silica gel. The initial humidity and initial silica gel color value inside each nylon tube were also determined. The nylon tube is placed in an conditioned experimental environment, which includes a standard experimental environment and periodic pressure changes; The experiment of the second experimental group was completed at the first preset time, and the adjusted change silica gel color value of each detection nylon tube in the second experimental group was determined, as well as the first adjusted humidity of each detection nylon tube in the second experimental group was determined. The experiment of the first experimental group was completed at the second preset time, and the second adjusted humidity and the resin weight at the end of the adjustment were determined for each nylon tube in the first experimental group. The adjusted experimental data includes adjusting the initial humidity, the first adjusted humidity, the second adjusted humidity, adjusting the initial silica gel color value, adjusting the changed silica gel color value, and adjusting the final resin weight. The periodic pressure change is set as a cycle of no pressure - low pressure - medium pressure - high pressure, where the sum of the durations of low pressure, medium pressure, and high pressure is equal to the duration of no pressure. The pressure of low pressure is 50% to 70% of the normal working pressure, the pressure of medium pressure is 80% to 120% of the normal working pressure, and the pressure of high pressure is 90% to 110% of the design limit pressure.

2. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 1, characterized in that, Methods for determining sampling methods based on the production volume and production sequence of the same production batch of nylon tubing include: The number of nylon tubes to be tested is determined based on the production volume and the preset sampling ratio. The number of sampling time nodes is determined based on the sampling quantity and the number of sampling inspection groups. Several sampling time nodes are determined based on the number of nodes and the production sequence; At each sampling time point, a number of nylon tubes for testing were randomly selected from the sampling test groups.

3. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 2, characterized in that, The method for conducting standard tests on each test nylon tube in the control test group includes: The test nylon tubes of the control group were divided into a first control group and a second control group according to a preset grouping ratio. In the first control group, a humidity sensor was installed inside each nylon tube and filled with a standard weight of resin, and the standard initial humidity inside each nylon tube was determined. In the second control group, a humidity sensor was installed inside each nylon tube and filled with a standard weight of silica gel. The standard initial humidity and standard initial silica gel color value inside each nylon tube were determined. The nylon tube was placed in a standard experimental environment, which was an ambient temperature of 40°C and an ambient relative humidity of 90%. The experiment of the second control group was completed at the first preset time, and the standard change silica gel color value of each test nylon tube in the second control group was determined, as well as the first standard humidity of each test nylon tube in the control test group was determined. The experiment of the first control group was completed at the second preset time, and the second standard humidity and standard end resin weight of each test nylon tube in the first control group were determined. Wherein, the preset grouping ratio is greater than or equal to 1:1; The standard experimental data include standard initial humidity, first standard humidity, second standard humidity, standard initial silica gel color value, standard changed silica gel color value, and standard final resin weight.

4. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 3, characterized in that, Methods for determining the trend of quality standard characterization based on the standard test data of each tested nylon tube include: The difference between the first standard humidity and the first standard humidity for each tested nylon tube is determined to determine the standard deviation of the first standard humidity; The standard deviation of the standard colorimetric value is determined based on the standard variation of the silicone colorimetric value of each tested nylon tube; The standard absorbent weight is determined based on the standard weight and standard end resin weight of each tested nylon tube, and the standard deviation of the standard absorbent weight of each tested nylon tube is then determined. The quality standard characterization trend is determined based on the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight, wherein... If the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight meet the standard consistency condition, then the quality standard characterization trend is determined to be a quality consistency trend. If the standard deviation of the first standard humidity, the standard deviation of the standard color value, and the standard deviation of the standard water absorption weight do not meet the standard consistency condition, then the quality standard characterization trend is determined to be a quality inconsistency trend. The standard consistency condition is that the difference rate between any two of the standard deviation parameters among the first standard humidity standard deviation, the standard color value standard deviation, and the standard water absorption weight standard deviation is less than a preset value.

5. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 4, characterized in that, The methods for determining the quality adjustment characterization trend based on the adjustment experimental data of each tested nylon tube include: The difference in the first adjusted humidity of each nylon tube is determined by comparing the initial adjusted humidity with the first adjusted humidity, and then the standard deviation of the first adjusted humidity is determined. The standard deviation of the adjusted colorimetric value is determined based on the adjusted colorimetric value of the silicone rubber described for each nylon tube being tested; The adjusted water absorption weight is determined based on the standard weight of each tested nylon tube and the final resin weight to determine the standard deviation of the adjusted water absorption weight of each tested nylon tube; The quality adjustment characterization trend is determined based on the first adjusted humidity standard deviation, the adjusted color value standard deviation, and the adjusted water absorption weight standard deviation, wherein... If the first standard deviation of adjusted humidity, the standard deviation of adjusted color value, and the standard deviation of adjusted water absorption weight meet the adjustment consistency condition, then the quality adjustment characteristic trend is determined to be a quality consistency trend. If the first standard deviation of humidity adjustment, the standard deviation of color value adjustment, and the standard deviation of water absorption weight adjustment do not meet the adjustment consistency condition, then the quality adjustment characteristic trend is determined to be a quality inconsistency trend. The adjustment consistency condition is that the difference rate between any two of the standard deviation parameters among the first adjusted humidity standard deviation, the adjusted color value standard deviation, and the adjusted water absorption weight standard deviation is less than a preset value.

6. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 1, characterized in that, The quality characterization status of the corresponding batch of nylon tubing is determined based on the judgment results of the quality standard characterization trend and the quality adjustment characterization trend, including: If both the quality characterization trend and the quality characterization trend are consistent trends, then the quality characterization status of the corresponding batch of nylon tubes is determined to be a stable state. If both the quality characterization trend and the quality characterization trend are quality variation trends, then the quality characterization status of the corresponding batch of nylon tubes is determined to be an obvious fluctuation state. If the quality characterization trend is different from the quality characterization trend, then the quality characterization status of the corresponding batch of nylon tubes is determined to be a latent fluctuation state.

7. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 1, characterized in that, The method for determining the water vapor barrier performance of nylon tubes based on the standard experimental data and the adjusted experimental data includes: The standard water absorption rate of each tested nylon tube is determined based on the ratio of the standard water absorption weight to the standard weight. The adjusted water absorption rate of each nylon tube is determined based on the ratio of the adjusted water absorption weight to the standard weight. The average standard water absorption rate and the average adjusted water absorption rate are determined based on the standard water absorption rate and the adjusted water absorption rate, respectively. The water vapor barrier performance of the nylon tube is determined based on the average standard water absorption rate and the average adjusted water absorption rate.

8. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 7, characterized in that, The water vapor barrier performance is positively correlated with the ratio of the average standard water absorption rate to the average adjusted water absorption rate, wherein, If the ratio of the average value of the standard water absorption rate to the average value of the corresponding adjusted water absorption rate is less than the reference value, then the water vapor barrier performance is determined to be non-compliant with the standard. If the ratio of the average value of the standard water absorption rate to the average value of the corresponding adjusted water absorption rate is greater than or equal to the reference value, then the water vapor barrier performance is determined to meet the standard.

9. The method for testing water vapor barrier properties of air suspension nylon tubing according to claim 8, characterized in that, Based on the quality characterization status and water vapor barrier performance, predict the testing time for this batch of nylon tubing during use, including... If the quality characterization state is stable and the water vapor barrier performance meets the standard, then the testing time of the nylon tubes in this production batch during use is determined to be the standard testing time. If the quality characterization state is a latent fluctuation state and the water vapor barrier performance meets the standard, then it is determined that the testing time of the nylon tubes in this production batch is less than the standard testing time during use. If the quality characterization state is an overtly fluctuating state, or if the quality characterization state is a covertly fluctuating state and the water vapor barrier performance does not meet the standard, then it is determined that the nylon tubes from this production batch will not be used.

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