A method for determining whether a shoe upper has a color shift problem

Abstract

The present invention discloses a method for determining whether a shoe upper has a color shifting problem, comprising the following steps: preparing at least two first samples; placing all first samples in a hot pressing device to obtain corresponding second samples, wherein the hot pressing temperature is 18-25°C higher than the first temperature, and the hot pressing pressure is 1-5 kg lower than the first pressure; the first temperature is the temperature measured by a thermocouple placed on the shoe upper during the hot pressing period in the seamless fusing process of the shoe upper, and the first pressure is the hot pressing pressure in the seamless fusing process of the shoe upper; a third sample is obtained after a high-temperature resistant film is torn off from the second sample, a water-based glue is applied, and the sample is dried; one of the third samples is reserved as a comparison sample, and the other third samples are placed in a hot and humid environment for 3-5 days and then cooled to obtain a sample to be tested; and then the color difference is compared. The present invention can determine whether the mesh fabric used to prepare the shoe upper through the seamless fusing process has a color shifting problem. If the determination result is unqualified, the mesh fabric material can be replaced with a mesh fabric material that is more suitable for the high-temperature process, thereby saving costs.

Description

Technical Field

[0001] The present invention relates to the technical field of footwear detection, and in particular to a method for determining whether a shoe upper has a color shift problem. Background Art

[0002] During the preparation process of shoes, multiple tests are required. Color transfer detection is very important for footwear products. The existing color transfer detection is mainly carried out in accordance with the national standard GB / T 3903.42-2008 or the test standards formulated by the company. In actual application, the upper, lining, insole and other materials are mainly tested for color transfer separately. The materials without color transfer problems will be judged as qualified and put into storage normally and used in the subsequent process to prepare the upper and obtain the finished shoes. The finished shoes will also be tested for color transfer before leaving the warehouse. This detection method is more suitable for uppers made by sewing and sewing technology. In this process, the sewing machine sews each component one by one according to the upper operation process standard. However, due to the complexity of sewing components, high labor cost and low production capacity, more and more shoe factories have begun to use seamless fusing technology to prepare uppers. Seamless fusing technology is the most suitable method for shoe uppers. The fusing process mainly prepares the shoe upper by placing the shoe upper film and shoe upper cloth in a mold, closing the mold and placing it in a pressing machine to heat it for a certain period of time. Since the shoe upper cloth and shoe upper film have undergone a high temperature and high pressure process, when using traditional detection methods to detect color transfer problems, the shoe upper, lining, insole and other materials often pass the color transfer test, but the finished shoes will gradually show problems such as material discoloration or glue line color transfer. Unqualified finished shoes will cause a large amount of waste of raw materials, and make research and development innovation limited to light-colored materials. In addition, high-temperature processes such as seamless fusing processes are often not able to be used to prepare shoe uppers, which makes it difficult to smoothly promote the improvement of production processes. Therefore, the existing shoe color transfer detection methods need to be further improved. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology, and to provide a method for determining whether a shoe upper has a color shifting problem. The method can determine whether the mesh cloth for the shoe upper prepared by a seamless melting process has a color shifting problem. If the judgment result is unqualified, the mesh cloth material can be replaced with a mesh cloth material that is more suitable for high-temperature processes, thereby saving costs and improving production efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] Technical solution 1, a method for determining whether a shoe upper has a color shift problem, wherein the shoe upper is made of mesh through a seamless fusing process, comprising the following steps: preparing at least two first samples, wherein the first sample is made by attaching a shoe upper adhesive film to a portion of the upper surface of the mesh and then covering the shoe upper adhesive film with a high-temperature resistant film; placing all first samples in a hot pressing device for hot pressing to obtain corresponding second samples, wherein the hot pressing temperature is 18-25°C higher than the first temperature, and the hot pressing pressure is within the first pressure range of 1-5Kg; the first temperature is the temperature measured by a thermocouple placed on the shoe upper during the hot pressing period in the seamless fusing process of the shoe upper, and the first pressure is the hot pressing pressure in the seamless fusing process of the shoe upper; tearing off the high-temperature resistant film from each second sample and applying a water-based After gluing and drying, a corresponding third sample is prepared. The water-based glue should cover the junction between the upper film and the mesh and leave at least a part of the area not covered by the upper film; one of the third samples is reserved as a comparison sample, and the other third samples are placed in an environment with a temperature of 70-80°C and a humidity of 95-97% for 3-5 days and then cooled to obtain a test sample; the national standard color card color grade corresponding to the color of the area of the upper film not covered by the water-based glue in the test sample and the comparison sample, and the national standard color card color grade corresponding to the color of the area of the upper film covered by the water-based glue are measured respectively; if the difference in the national standard color card color grade between the test sample and the comparison sample in any corresponding area is greater than 1.5 grades, it is determined that the shoe upper has a color shift problem; otherwise, it is determined that the shoe upper does not have a color shift problem.

[0006] Based on Technical Solution One, there is also a Technical Solution Two. In Technical Solution Two, when the color grade difference between the national standard color card corresponding to the color of the area of the shoe upper film not covered by the water-based glue in the test sample and the comparison sample is greater than level 1, it is determined that there is a color shifting problem on the shoe upper; when the color grade difference between the national standard color card corresponding to the color of the area of the shoe upper film covered by the water-based glue in the test sample and the comparison sample is greater than level 1.5, it is determined that there is a color shifting problem on the shoe upper.

[0007] Based on the second technical solution, a third technical solution is also provided. In the third technical solution, each second sample is placed on an isolation film before applying the water-based glue.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four, the mesh is rectangular; the upper film is long and strip-shaped, its length direction is parallel to the length direction of the mesh, and it is placed in the middle of the mesh; the water-based glue is applied to the upper film and the mesh in a manner that intersects perpendicularly with the upper film.

[0009] Based on Technical Solution 4, there is also Technical Solution 5. In Technical Solution 5, after applying the water-based glue, it is dried at 70-75°C for 5-8 minutes, cooled at room temperature for 0.5-1 hour, and then placed in a constant temperature and humidity chamber at a temperature of 70-80°C and a humidity of 95-97% for 3-5 days to obtain the test sample.

[0010] Based on technical solution five, there is also technical solution six. In technical solution six, the upper film is a white PP film, the high temperature resistant film is a release paper, and the mesh is a dark mesh.

[0011] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. In the first technical solution, when preparing the shoe upper by the seamless fusing process, the shoe upper film and the mesh are often attached and placed in a hot pressing machine for hot pressing. After the shoe upper is prepared, water-based glue is generally applied. The preparation of the test sample of the present invention simulates the process of hot pressing the mesh and the shoe upper film when the mesh is prepared by the seamless fusing process for the shoe upper, and applying water-based glue after the shoe upper is prepared. Specifically, when the mesh and the shoe upper film are hot pressed in the hot pressing equipment, the hot pressing temperature is higher than the first temperature by 18-25°C, and the hot pressing pressure is lower than the first pressure by 1-5Kg. The first temperature is the temperature measured by the thermocouple placed on the shoe upper when the hot pressing period is reached in the seamless fusing process for the shoe upper. The first pressure is the hot pressing pressure in the seamless fusing process for the shoe upper. When detecting the first temperature, the thermocouple is placed on the shoe upper and the pressure is The upper mold of the ironing machine will also press on the thermocouple after pressing down. The material of the thermocouple is not easily damaged and can also detect the temperature of the shoe upper. However, since the upper mold and the lower mold of the ironing machine often have a certain thickness after being combined, the temperature detected by the thermocouple is often lower than the heating temperature of the upper template or the lower template of the ironing machine. There is no mold during the test of this application. The hot pressing temperature is 18-25℃ higher than the first temperature, which is closer to the hot pressing process of the original process. The mesh and the upper film are bonded to each other under hot pressing. Similarly, the hot pressing machine presses through the mold during hot pressing. The hot pressing pressure is within the range of the first pressure ±5Kg, which is closer to the original process. The third sample was made by applying water-based glue on the second sample. The water-based glue covers the junction of the upper film and the mesh and leaves at least a part that is not covered by the upper film. The third sample after applying water-based glue is closer to the sample of the finished shoe. One of the samples is a comparison sample. The other samples are placed in a humid and hot environment for 3-5 days in the experiment to simulate the situation of the finished shoe after being placed for 3-6 months under normal circumstances. During the test, the color level of the national standard color card corresponding to the color of the area of the upper film not covered by water-based glue in the test sample and the comparison sample is measured to detect whether the color of the mesh will penetrate into the upper film. The upper film of the comparison sample can be used as the initial data, which is more accurate and has smaller errors. The color level of the national standard color card corresponding to the color of the area of the upper film covered by water-based glue is detected to detect whether the color of the mesh will penetrate into the upper film. When the color grade difference between the national standard color card of the test sample and the comparison sample in any corresponding area is greater than 1.5 levels, it is determined that the shoe upper has a color transfer problem. The color difference of the national standard color card is greater than 1.5 levels, which means that the color of the mesh has shifted more than 1.5 levels on the shoe upper film or water-based glue, that is, it is unqualified. It can be seen that the adoption of this technical solution can simulate the process of preparing the shoe upper by the seamless melting process using mesh. In actual application, if the method of this technical solution is used to determine that the shoe upper has a color transfer problem, the finished shoe will most likely also have a color transfer problem. Therefore, the method of this technical solution can be used in advance to determine. If the determination result is unqualified, the mesh material can be replaced with a mesh material that is more suitable for high-temperature technology, thereby saving costs and improving production efficiency.

[0013] 2. In Technical Solution 2, the color shift determination method is closer to the actual situation of the original process and the detection is more accurate.

[0014] 3. In the third technical solution, each second sample is placed on an isolation film before applying the water-based glue, which prevents the water-based glue from contaminating the work surface and facilitates the movement of the third sample.

[0015] 4. In technical solution four, the mesh is rectangular and the upper film is long and strip-shaped. The upper film is placed in the middle of the mesh, and the water-based glue is applied to the upper film and the mesh in a manner that intersects perpendicularly with the upper film, so as to ensure that the water-based glue covers the junction between the upper film and the mesh and leaves at least a part of the area not covered by the upper film.

[0016] 5. In technical solution five, the detection error is smaller when the water-based glue is placed in a hot and humid environment after drying.

[0017] 6. In technical solution six, the upper film is a white PP film and the mesh is a dark mesh, which is easier to observe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the third sample prepared. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] In the claims, description and drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is for the purpose of distinguishing different objects rather than for describing a specific order.

[0022] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0023] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0024] Example 1

[0025] A method for determining whether a shoe upper has a color shift problem, wherein the shoe upper is made of mesh fabric through a seamless fusing process, comprising the following steps:

[0026] Prepare at least two first samples, each of which is made by attaching a shoe upper film to a portion of the upper surface of a mesh and then covering the shoe upper film with a high-temperature resistant film. In this embodiment, the mesh is a black mesh with a 2-3 layer structure and a size of 100 mm * 100 mm. The shoe upper film is a white PP film with a size of 40 mm * 100 mm. That is, the mesh is rectangular and the shoe upper film is a long strip. The length direction of the shoe upper film is parallel to the length direction of the mesh. The shoe upper film is placed in the middle of the mesh. In actual application, hot melt adhesive is applied to the middle of the mesh, and the shoe upper film is placed on the area corresponding to the hot melt adhesive. Prepare two first samples in this embodiment.

[0027] All first samples are placed in a hot pressing device to obtain corresponding second samples, the hot pressing temperature is 25°C higher than the first temperature, and the hot pressing pressure is 5Kg lower than the first pressure; the first temperature is the temperature measured by a thermocouple placed on the shoe upper when the hot pressing period is reached in the shoe upper seamless fusing process, and the first pressure is the hot pressing pressure in the shoe upper seamless fusing process; the hot pressing device in this embodiment is a sublimation fastness tester. In actual application, the heating temperature of the upper mold of the pressing device in the shoe upper seamless fusing process is 260°C, the heating temperature of the lower mold is 120°C, the hot pressing pressure is 35Kg, the hot pressing time is 60S, the cold pressing pressure is 40Kg, the cold pressing time is 15S, and the cold pressing temperature is 0-5°C; in this embodiment, the measured first temperature is the temperature of the thermocouple when the hot pressing time reaches 60S, and the measured first temperature is 115°C. Accordingly, the hot pressing temperature is set to 140°C and the hot pressing pressure is 40Kg;

[0028] Each second sample is placed on the corresponding isolation film, which is a silicone film to prevent contamination of the work surface. The high-temperature resistant film is removed from each second sample, and then the water-based glue is applied and dried to obtain the corresponding third sample. The water-based glue should cover the junction between the upper film and the mesh and leave at least a portion of the area not covered by the upper film. In this embodiment, the water-based glue is applied to the upper film and the mesh in a manner perpendicular to the upper film. Figure 1 , after applying water-based glue, dry it in a hot oven at 70℃ for 5 minutes, and then cool it at room temperature for 0.5 hours;

[0029] One of the third samples was set aside as a control sample, and the other third samples were placed in a constant temperature and humidity chamber at a temperature of 70° C. and a humidity of 95% for 3 days and then cooled to obtain samples to be tested.

[0030] Example 2

[0031] The preparation methods of the comparative samples and the test samples of Example 2 and Example 1 are basically the same, except that the test samples are placed in a constant temperature and humidity chamber for 5 days.

[0032] Example 3

[0033] The preparation methods of the control samples and test samples of Example 3 and Example 1 are basically the same, except that the mesh has a 3-4 layer structure and its thickness is thicker than that of Example 1. The first temperature measured in the pressing equipment of the seamless melting process of the upper is 125°C, and the hot pressing temperature of the hot pressing equipment is set to 145°C accordingly, and the hot pressing time is 45S.

[0034] Example 4

[0035] The preparation methods of the control sample and the test sample of Example 4 and Example 3 are basically the same, except that the test sample is placed in a constant temperature and humidity chamber for 5 days.

[0036] Example 5

[0037] The preparation methods of the control samples and test samples of Example 5 and Example 1 are basically the same, except that the mesh is a combination of 3-5 layers of woven fabric and leather, and its thickness is thicker. The first temperature measured in the pressing equipment of the seamless melting process of the upper is 135°C, and the hot pressing temperature of the hot pressing equipment is set to 148°C accordingly, and the hot pressing time is 60S.

[0038] Example 6

[0039] The preparation methods of the control sample and the test sample of Example 6 and Example 5 are basically the same, except that the test sample is placed in a constant temperature and humidity chamber for 5 days.

[0040] Measure the color grades of the national standard color card corresponding to the colors of the areas of the shoe upper film not covered by water-based glue (area 1 in the table below) in the test samples and the comparison samples in Examples 1-6, and the color grades of the national standard color card corresponding to the colors of the areas of the shoe upper film covered by water-based glue (area 2 in the table below); if the color grade difference between the national standard color card of the test sample and the comparison sample in any corresponding area is greater than 1.5 grades, it is determined that there is a color shifting problem on the shoe upper; otherwise, it is determined that there is no color shifting problem on the shoe upper. In this embodiment, if the color grade difference between the national standard color card of the test sample and the area of the shoe upper film not covered by water-based glue (area 1 in the table below) in the comparison sample is greater than 1 grade, it is determined that there is a color shifting problem on the shoe upper; if the color grade difference between the national standard color card of the test sample and the area of the shoe upper film covered by water-based glue (area 2 in the table below) in the comparison sample is greater than 1.5 grades, it is determined that there is a color shifting problem on the shoe upper.

[0041] The test results are shown in the following table:

[0042] Test results of Examples 1-6

[0043]

[0044] The experimental results of Examples 1-6 show that the test samples tested using the method of this embodiment passed the test after three days in a constant temperature and humidity chamber, while the test sample of Example 6 failed the test after five days. It is understood that the longer the test samples are placed in the constant temperature and humidity chamber at 70°C and 97% humidity, the longer the simulated finished shoe is placed, and the corresponding testing standards become more stringent. Therefore, the duration of placement in the constant temperature and humidity chamber can be selected based on the testing standards for finished shoes. This is not limited in this embodiment, but it must be at least three days in a constant temperature and humidity chamber at 70°C and 97% humidity. In actual applications, the hot pressing temperature and pressing time of the hot pressing equipment can be adjusted according to the material and thickness of the mesh.

[0045] By adopting this technical solution, the process of preparing shoe uppers using mesh through a seamless melting process can be simulated. In actual applications, if the method of this technical solution is used to determine that the shoe upper has a color shifting problem, the finished shoes will most likely also have a color shifting problem. Therefore, the method of this technical solution can be used in advance to make a determination. If the determination result is unqualified, the mesh material can be replaced with a mesh material that is more suitable for high-temperature processes, thereby saving costs and improving production efficiency.

[0046] Specifically, when preparing the shoe upper by the seamless fusing process, the shoe upper adhesive film and the mesh cloth are often attached and placed in a hot pressing machine for hot pressing. After the shoe upper is prepared, water-based glue is generally applied. The preparation of the test sample of the present invention simulates the process of hot pressing the mesh cloth and the shoe upper adhesive film when the mesh cloth is prepared by the seamless fusing process for the shoe upper, as well as the process of applying water-based glue after the shoe upper is prepared. Specifically, when the mesh cloth and the shoe upper adhesive film are hot pressed in the hot pressing equipment, the hot pressing temperature is 18-25°C higher than the first temperature, and the hot pressing pressure is 1-5Kg lower than the first pressure. The first temperature is the temperature measured by the thermocouple placed on the shoe upper when the hot pressing period is reached in the seamless fusing process for the shoe upper. The first pressure is the hot pressing pressure in the seamless fusing process for the shoe upper. When detecting the first temperature, the thermocouple is placed on the shoe upper and the pressure is The upper mold of the ironing machine will also press on the thermocouple after pressing down. The material of the thermocouple is not easily damaged and can also detect the temperature of the shoe upper. However, since the upper mold and the lower mold of the ironing machine often have a certain thickness after being combined, the temperature detected by the thermocouple is often lower than the heating temperature of the upper template or the lower template of the ironing machine. There is no mold during the test of this application. The hot pressing temperature is 18-25℃ higher than the first temperature, which is closer to the hot pressing process of the original process. Under hot pressing, the hot melt adhesive melts and bonds the mesh and the shoe upper film to each other; similarly, the ironing machine presses through the mold during hot pressing, and the hot pressing pressure is within the range of the first pressure ±5Kg, which is closer to the original process; the third sample is made by applying water-based glue on the second sample, and the water-based glue covers the junction of the shoe upper film and the mesh and leaves at least part The area not covered by the upper film is divided into two parts, so that it is possible to observe on the upper film whether the color of the mesh has penetrated into the upper film or the water-based glue. The third sample after the water-based glue is applied is closer to the sample of the finished shoe. One of the samples is a comparison sample. The other samples are placed in a humid and hot environment for 3-5 days in the experiment to simulate the situation of the finished shoe after being placed for 3-6 months under normal circumstances. During the test, the color level of the national standard color card corresponding to the color of the area of the upper film not covered by the water-based glue in the test sample and the comparison sample is measured to detect whether the color of the mesh has penetrated into the upper film. The upper film of the comparison sample can be used as the initial data, which is more accurate and has smaller errors. The color level of the national standard color card corresponding to the color of the area of the upper film covered by the water-based glue is detected. It can detect whether the color of the mesh will penetrate into the water-based glue. When the color grade difference of the national standard color card between the test sample and the comparison sample in any corresponding area is greater than 1.5 levels, it is determined that there is a color transfer problem on the shoe upper. The color difference of the national standard color card is greater than 1.5 levels, which means that the color of the mesh has transferred more than 1.5 levels on the shoe upper film or water-based glue. When the color grade difference of the national standard color card corresponding to the color of the area of the shoe upper film not covered by the water-based glue between the test sample and the comparison sample is greater than 1 level, it is determined that there is a color transfer problem on the shoe upper. When the color grade difference of the national standard color card corresponding to the color of the area of the shoe upper film covered by the water-based glue between the test sample and the comparison sample is greater than 1.5 levels, it is determined that there is a color transfer problem on the shoe upper, that is, it is unqualified. It is closer to the actual situation of the original process and the detection is more accurate.

[0047] The above description and embodiments are intended to explain the scope of protection of the present invention, but do not constitute a limitation thereto. Modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or portions thereof that can be obtained by a person of ordinary skill in the art through logical analysis, reasoning, or limited experimentation based on the teachings of the present invention or the above embodiments, combined with common knowledge, ordinary technical knowledge in the field, and / or prior art, should all be included within the scope of protection of the present invention.

Claims

1. A method for determining whether a shoe upper has a color shift problem, wherein the shoe upper is made of mesh fabric through a seamless fusing process, wherein: The steps include: preparing at least two first samples, wherein the first samples are prepared by attaching a shoe upper film to a portion of the upper surface of the mesh and then covering the shoe upper film with a high-temperature resistant film; All first samples are placed in a hot pressing device for hot pressing to obtain corresponding second samples. The hot pressing temperature is 18-25°C higher than the first temperature, and the hot pressing pressure is within the range of ±5 kg of the first pressure. The first temperature is the temperature measured by a thermocouple placed on the shoe upper during the hot pressing period in the seamless fusing process of the shoe upper. The first pressure is the hot pressing pressure in the seamless fusing process of the shoe upper. The high-temperature resistant film is removed from each second sample, and then a water-based glue is applied and dried to produce the corresponding third sample. The water-based glue should cover the junction between the upper film and the mesh and leave at least a portion of the area not covered by the upper film. One of the third samples is kept as a control sample, and the other third samples are placed in an environment with a temperature of 70-80°C and a humidity of 95-97% for 3-5 days and then cooled to obtain a sample to be tested; Measure the color grades of the national standard color card corresponding to the color of the areas of the shoe upper film not covered by the water-based adhesive in the test sample and the comparison sample, and the color grades of the national standard color card corresponding to the color of the areas of the shoe upper film covered by the water-based adhesive; if the difference in the color grades of the national standard color card between the test sample and the comparison sample in any corresponding area is greater than 1.5 grades, it is determined that there is a color shift problem on the shoe upper; otherwise, it is determined that there is no color shift problem on the shoe upper.

2. The method for determining whether a shoe upper has a color shift problem according to claim 1, wherein: When the color grade difference between the national standard color card corresponding to the color of the area of the shoe upper film not covered by the water-based adhesive in the test sample and the comparison sample is greater than 1 level, it is determined that there is a color shift problem on the shoe upper; when the color grade difference between the national standard color card corresponding to the color of the area of the shoe upper film covered by the water-based adhesive in the test sample and the comparison sample is greater than 1.5 levels, it is determined that there is a color shift problem on the shoe upper.

3. The method for determining whether a shoe upper has a color shift problem according to claim 2, wherein: Before applying the water-based glue, each second test sample was placed on a release film.

4. The method for determining whether a shoe upper has a color shift problem according to claim 3, wherein: The mesh is rectangular; the upper adhesive film is long and strip-shaped, its length direction is parallel to the length direction of the mesh, and it is placed in the middle of the mesh; the water-based adhesive is coated on the upper adhesive film and the mesh in a manner of perpendicularly intersecting the upper adhesive film.

5. The method for determining whether a shoe upper has a color shifting problem as claimed in claim 4, wherein: After applying the water-based glue, dry it at 70-75℃ for 5-8 minutes, cool it at room temperature for 0.5-1 hour, and then place it in a constant temperature and humidity box at 70-80℃ and 95-97% humidity for 3-5 days, then cool it to obtain the test sample.

6. The method for determining whether a shoe upper has a color shifting problem according to claim 5, wherein: The shoe upper film is a white PP film, the high temperature resistant film is a release paper; and the mesh is a dark mesh.

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