Method and device for testing al-plastic laminate aluminum foil based on high temperature pyrolysis

Abstract

The application provides a kind of aluminium plastic film aluminium foil test method and device based on high temperature pyrolysis, it is related to the technical field of aluminium plastic film performance test, the test method includes the following steps: in inert atmosphere, to be measured aluminium plastic film sample is heated, then the thickness measurement of the aluminium plastic film sample to be measured after cooling;Wherein, the temperature of heating is 500-700 DEG C.The aluminium plastic film aluminium foil test method based on high temperature pyrolysis provided in the application is heated to 500-700 DEG C in inert atmosphere to be measured aluminium plastic film sample, makes PET layer, PA layer, CPP layer and each adhesive layer pyrolysis and volatilization, only retains the aluminium foil layer of structural integrity;After cooling, the thickness measurement of the aluminium foil layer is directly carried out, thereby avoids the measurement uncertainty caused by the deviation of slicing flatness, artificial point error and visual judgment limitation in traditional slicing-metallurgical observation method, significantly improves the precision and repeatability of aluminium foil thickness test.

Description

Technical Field

[0001] This invention relates to the field of aluminum-plastic film performance testing technology, and in particular to a method and apparatus for testing aluminum foil based on high-temperature pyrolysis. Background Technology

[0002] Aluminum-plastic film is a core material for lithium battery encapsulation. Its typical structure is a multi-layer composite structure of PET / adhesive / PA / adhesive / AL / adhesive / CPP. The aluminum foil layer acts as a barrier layer, and its thickness and residual rate after punching directly affect the encapsulation reliability and safety performance of the lithium battery. Currently, the industry's testing of aluminum foil in aluminum-plastic film (including thickness detection corresponding to the residual rate of aluminum foil at the R-corner after punching and analysis of aluminum foil thickness of competing products) mainly adopts a combination of "slicing machine + metallographic magnifying glass". The aluminum-plastic film sample is physically sliced ​​by the slicer, and then the cross-section is observed using a metallographic magnifying glass. The thickness of the aluminum foil is manually measured by plotting points.

[0003] The existing solution has two major pain points: First, the measurement error is large. During the manual measurement process, the error can reach 3-5μm due to the flatness of the slice, the bias of visual judgment, and the limitations of manual operation accuracy, which cannot meet the requirements of high-precision testing. Second, the equipment cost is high. The total cost of the combination of the slicer and the metallographic magnifying glass is as high as more than 400,000 yuan, which greatly increases the company's testing investment and is not suitable for batch testing scenarios. Summary of the Invention

[0004] One of the objectives of this invention is to provide a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis, so as to at least solve one of the technical problems existing in the prior art.

[0005] The second objective of this invention is to provide a testing device for a high-temperature pyrolysis-based testing method for aluminum-plastic film and aluminum foil.

[0006] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: In a first aspect, the present invention provides a method for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis, comprising the following steps: In an inert atmosphere, the aluminum-plastic film sample to be tested is heated, and then the thickness of the cooled aluminum-plastic film sample is measured. The heating temperature is 500-700℃.

[0007] Furthermore, the heating temperature is 550-600℃.

[0008] Furthermore, the heating time is 10-20 minutes.

[0009] Furthermore, the cooling time is 15-20 minutes.

[0010] Furthermore, the inert atmosphere is provided by gases including nitrogen and / or argon, with a permeation rate of 5-10 L / min.

[0011] Secondly, the present invention provides a testing apparatus based on the aforementioned high-temperature pyrolysis-based aluminum-plastic film and aluminum foil testing method, comprising: The heating module is used to heat the aluminum-plastic film sample to be tested. An inert gas protection module, connected to the heating module, is used to supply inert gas to the interior of the heating module; A cooling module is used to cool the sample after it has been processed by the heating module; A thickness measurement module is used to measure the thickness of the sample after it has been processed by the cooling module.

[0012] Furthermore, the testing device also includes a sample carrier module, which includes a carrier for adapting to aluminum-plastic film samples of different geometries.

[0013] Furthermore, the sample carrying module includes an arc-shaped sample carrier and / or a planar sample carrier; The arc-shaped sample carrier is provided with a positioning groove that matches the contour of the aluminum-plastic film sample.

[0014] Furthermore, the inert gas protection module includes a gas storage tank and a gas delivery pipe; One end of the gas guide pipe is connected to the gas storage tank, and the other end of the gas guide pipe is connected to the heating module.

[0015] Furthermore, the thickness measurement module includes a digital micrometer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The aluminum foil testing method based on high-temperature pyrolysis provided by this invention heats the aluminum-plastic film sample to 500-700℃ in an inert atmosphere, causing the PET layer, PA layer, CPP layer and each adhesive layer to pyrolyze and volatilize, leaving only the structurally intact aluminum foil layer. After cooling, the thickness of the aluminum foil layer is directly measured, thereby avoiding the measurement uncertainty caused by the flatness deviation of the slice, the error of manual plotting and the limitation of visual judgment in the traditional slice-metallographic observation method, and significantly improving the accuracy and repeatability of aluminum foil thickness testing. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis provided by the present invention.

[0019] Illustration: 1-Heat insulation cover; 2-Heating module; 3-Cooling module; 4-Pipeline regulating valve; 5-Control display; 6-Bearing module; 7-Gas storage tank. Detailed Implementation

[0020] Unless otherwise defined herein, the scientific and technical terms used in conjunction with this invention shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The first aspect of the present invention provides a method for testing aluminum foil based on high-temperature pyrolysis aluminum-plastic film, comprising the following steps: heating the aluminum-plastic film sample to be tested in an inert atmosphere, and then measuring the thickness of the cooled aluminum-plastic film sample; wherein the heating temperature is 500-700℃, for example, 500℃, 550℃, 600℃, 650℃, 700℃, etc.

[0023] The aluminum-plastic film sample in this invention has the following structure: a PET (polyethylene terephthalate film) layer, an adhesive layer, a polyamide film (PA) layer, an adhesive layer, an aluminum foil layer (AL), an adhesive layer, and a cast polypropylene film (CPP) layer. Among them, the aluminum foil layer is an aluminum alloy foil (such as 8021 alloy) that has undergone cold rolling and annealing treatment. It is the core layer in the entire aluminum-plastic film that undertakes the functions of water and oxygen barrier and structural support, and is the direct object of the thickness test in this invention.

[0024] The testing method provided by this invention is applicable to scenarios such as testing the residual aluminum foil rate at the R-angle after aluminum-plastic film stamping, testing the aluminum foil thickness of competing aluminum-plastic films, and detecting the aluminum foil thickness at various locations on aluminum-plastic films. The core of this invention lies in utilizing the differences in heat resistance of the various layers of the aluminum-plastic film to achieve selective removal of non-aluminum layers. It eliminates the need for expensive slicing machines and metallographic magnifying glasses, allowing for high-precision measurements using conventional precision measuring tools, thus reducing testing costs and improving testing efficiency and measurement accuracy.

[0025] Further explanation reveals significant differences in heat resistance among the various layers of the aluminum-plastic film: the thermal decomposition temperatures of the PET film, PA film, CPP film, and the interlayer adhesives (polyurethane / acrylate-based) are all between 200-400℃, while the melting point of pure aluminum foil is approximately 660℃. Based on this characteristic, placing the aluminum-plastic film sample in a high-temperature environment of 500-700℃ allows for complete pyrolysis (melting, carbonization, and volatilization) of the PET film, PA film, CPP film, and adhesives, leaving only the aluminum foil sample. The aluminum foil thickness can then be directly measured using a micrometer, avoiding the errors and high costs associated with manual marking and complex slicing processes.

[0026] Specifically, the aluminum-plastic film and aluminum foil testing method based on high-temperature pyrolysis includes the following steps: (1) The aluminum-plastic film sample to be tested is heated in an inert atmosphere environment. By introducing inert gas to isolate it from air, the aluminum foil is prevented from being oxidized at high temperature to form an aluminum oxide layer, ensuring the surface of the aluminum foil is clean and reducing measurement errors. The heating temperature is 500-700℃, more preferably 550-600℃. This temperature range is sufficient to completely pyrolyze the PET layer, PA layer, CPP layer and the adhesive between the layers in the aluminum-plastic film, while avoiding melting and deformation of the aluminum foil.

[0027] (2) Cool the sample after the above heat treatment; wherein the cooling time is 15-20 minutes, for example, 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes, 20 minutes, etc., to cool the sample to room temperature. This cooling process is carried out at room temperature to avoid rapid cooling that could cause deformation of the aluminum foil.

[0028] (3) The thickness of the sample after cooling to room temperature is measured. Since the PET layer, PA layer, CPP layer and adhesive layer have been selectively removed in the heating step, the object being measured is the bare aluminum foil layer, and its true thickness value can be obtained directly using a measuring instrument.

[0029] In some preferred embodiments, the heating time is 10-20 minutes, for example, 10 minutes, 15 minutes, 20 minutes, etc. This time can be adaptively set according to the thickness of the aluminum-plastic film sample to be tested and the density of the interlayer structure to ensure that the organic components are fully decomposed and released.

[0030] In some preferred embodiments, the inert atmosphere is provided by nitrogen and / or argon, which are chemically stable and do not react with the aluminum foil or pyrolysis products. The ventilation rate is 5-10 L / min, for example, 5 L / min, 6 L / min, 7 L / min, 8 L / min, 9 L / min, 10 L / min, etc.

[0031] A second aspect of the present invention provides a testing device, which is a functionally integrated system specifically designed to perform the above-mentioned high-temperature pyrolysis testing method. Its modules are configured according to the physical state evolution sequence of the aluminum-plastic film sample in the testing process, and together complete the transformation and characterization from the multilayer composite sample to the pure aluminum foil layer.

[0032] like Figure 1 As shown, the testing apparatus includes: Heating module 2 is used to heat the aluminum-plastic film sample under test in an inert atmosphere. It employs a muffle furnace (or high-temperature oven) with precise temperature control, a temperature range of 500-700℃, and an optimal temperature range of 550-600℃. Optionally, heating module 2 is equipped with a temperature sensor and temperature controller, with a temperature control accuracy of ≤±5℃. The heating time can be set according to the sample specifications (thickness, shape) (10-20 min, suitable for samples with rounded corners and flat samples), and precise adjustment of the heating time is supported.

[0033] An inert gas protection module, connected to the heating module 2, is used to continuously supply inert gas to the interior of the heating module 2. Specifically, the inert gas protection module includes a gas storage tank 7 and a gas delivery pipe. One end of the gas delivery pipe is connected to the gas storage tank 7, and the other end extends into the internal cavity of the heating module 2. The outlet of the gas delivery pipe faces the sample area, allowing the inert gas to be directionally delivered to the sample to maintain the chemical stability of the heating environment. A pipe regulating valve 4 is provided on the gas delivery pipe for precisely controlling the flow rate of the inert gas (such as nitrogen).

[0034] Cooling module 3 is used to allow the pyrolyzed aluminum foil sample to cool naturally to room temperature. Optionally, cooling module 3 is located below heating module 2 and is used to blow cooling air onto heating module 2. A room temperature cooling stage is used, made of a metal with excellent thermal conductivity (such as copper or aluminum), and its surface is covered with a high-temperature resistant heat insulation pad to prevent sudden temperature changes and deformation caused by contact between the sample and the metal during cooling. After pyrolysis, the sample and the carrier are transferred together to the cooling stage and allowed to cool naturally to room temperature for approximately 15-20 minutes, suitable for subsequent thickness measurements.

[0035] The thickness measurement module is used to measure the thickness of the sample after it has been cooled to room temperature by the cooling module 3. The thickness measurement module can use a digital micrometer with a measurement accuracy of 0.001 mm (1 μm). It supports adjustable measurement pressure (setting a uniform pressure threshold) to ensure consistent pressure for each measurement and avoid measurement errors caused by pressure differences. The micrometer is equipped with a measurement auxiliary stage to stably place the aluminum foil sample, ensuring complete contact between the measurement surface and the aluminum foil surface and avoiding deviations caused by tilted measurements.

[0036] Specifically, the process of using this test kit is as follows: The aluminum-plastic film sample was placed on a miniature sample stage. First, a vacuum was drawn to remove the air, and then nitrogen was introduced to create a protective atmosphere. The temperature was raised to the set temperature for constant-temperature pyrolysis. After natural cooling, the sample was taken out and the thickness of the aluminum foil was measured with a micrometer.

[0037] The modules mentioned above work together to ensure the stability of the testing process and the accuracy of the measurements.

[0038] In some preferred embodiments, the testing device further includes a sample carrying module 6, specifically a miniature sample stage, which is disposed within the heating module 2. The sample carrying module 6 is used to hold and fix the aluminum-plastic film sample to be tested.

[0039] More preferably, the sample carrying module 6 is adaptable to two sample shapes, including arc-shaped samples with R-angles after shelling and flat samples, and is made of high-temperature resistant ceramic material (high temperature resistance ≥800℃, does not react with aluminum foil and pyrolysis products). The sample carrying module 6 may optionally include arc-shaped sample carriers and / or flat sample carriers to adapt to arc-shaped samples with R-angles after shelling and flat samples, respectively.

[0040] Specifically: (1) Arc-shaped sample carrier: Matching the curvature of the R-angle after the aluminum-plastic film is punched, an arc-shaped groove is set. The inner wall of the groove is smooth, so that the arc-shaped sample can be embedded in the groove, avoiding wrinkles caused by gravity deformation or thermal shrinkage of the sample at high temperature.

[0041] (2) Planar sample carrier: It is a flat ceramic carrier with a lightweight ceramic pressing plate. The planar sample can be laid flat on the carrier and fixed by the pressing plate to prevent displacement or wrinkling during the pyrolysis of the sample. Optionally, the planar sample is cut to a size that matches the planar sample carrier. During the sample preparation process, avoid touching the test area to prevent contamination or deformation.

[0042] In one optional embodiment, the testing device further includes a nitrogen heat insulation protective cover 1, which is installed on top of the heating module 2 and covers the sample carrying module 6 and the aluminum-plastic film sample to be tested. This is used for sealing and isolation, which can effectively maintain the stability of the inert atmosphere in the cavity, reduce heat loss, and improve temperature control accuracy and energy efficiency.

[0043] In one optional embodiment, the testing device further includes a control display 5, which is electrically connected to the heating module 2, the inert gas protection module, and the cooling module 3, and provides integrated setting and real-time monitoring of key parameters such as heating temperature, constant temperature time, cooling time (and gas flow rate).

[0044] In the optional embodiments of this example, the preferred method for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis specifically includes the following steps: Step 1: Sample Preparation Select aluminum-plastic film samples according to testing requirements: If testing the residual aluminum foil rate at the R-corner after punching, cut the R-corner portion of the aluminum-plastic film after punching as the sample, ensuring the sample size matches the groove of the curved support component; if testing the aluminum foil thickness of competitors, cut the flat portion of the competitor's aluminum-plastic film as the sample, and cut it to a size matching the flat support component (e.g., 2cm × 2cm). During sample preparation, avoid touching the test area to prevent surface contamination or deformation.

[0045] Step 2: Sample fixation Fix the sample on the corresponding sample carrier: for arc-shaped samples, embed them into the arc-shaped groove to ensure that the sample fits the groove; for flat samples, lay them flat on the flat carrier and cover them with a ceramic pressing plate for fixation. The pressing pressure should be such that it does not damage the sample or affect the volatilization of pyrolysis gases.

[0046] Step 3: High-temperature pyrolysis and inert gas protection Place the carrier with the sample fixed inside the high-temperature heating module 2 and close the door of the heating module 2. Turn on the inert gas protection module and introduce inert gas (nitrogen) into the heating module 2 to purge the air inside the chamber (preheating and ventilation time ≥ 5 min). Then, keep the inert gas continuously introduced (ventilation rate 5-10 L / min). Start the high-temperature heating module 2 and raise the temperature to 550-600℃. Maintain this temperature for 10-20 min to completely pyrolyze the PET film, PA film, CPP film, and adhesive, leaving only the aluminum foil sample.

[0047] Step 4: Sample cooling and post-processing After heating is complete, turn off the high-temperature heating module 2 and continue to introduce inert gas until the sample cools down to below 200°C. Then transfer the sample and carrier to the cooling stage of the cooling module 3 and let it cool naturally to room temperature. After cooling, gently wipe the surface of the aluminum foil sample with a lint-free cloth to remove any remaining incompletely decomposed carbides and ensure that the sample surface is clean and free of impurities.

[0048] Step 5: Thickness Measurement and Data Processing Place the processed aluminum foil sample on the measuring auxiliary platform of a micrometer, adjust the micrometer to the measuring pressure threshold, select 3-5 different measuring points on the sample test area for measurement, and record the thickness value of each measuring point; calculate the average value of all measuring points as the final thickness of the aluminum foil sample. If it is a stamped shell R-corner sample, the aluminum foil residual rate can be calculated based on this thickness.

[0049] The technical advantages of the aluminum-plastic film and aluminum foil testing method and testing device based on high-temperature pyrolysis provided by this invention mainly include: (1) Improved accuracy In terms of accuracy, this invention avoids the measurement errors caused by manual marking, slice flatness deviation, and visual judgment limitations in the existing slicer + metallographic magnifying glass method. After selectively removing PET, PA, CPP, and adhesive layers through high-temperature pyrolysis, the thickness of the exposed pure aluminum foil sample is directly measured using a micrometer, reducing the measurement error to within 0.5 μm. This is a significant improvement compared to the 3-5 μm error level of the existing technology, and can fully meet the high-precision testing requirements for aluminum foil thickness in the lithium battery packaging field.

[0050] (2) Cost reduction In terms of cost, there is no need to purchase expensive slicers and metallographic magnifying glasses. The core equipment only requires a conventional muffle furnace, a digital micrometer, and high-temperature resistant ceramic support components. The total cost of the entire system can be controlled within tens of thousands of yuan, which greatly reduces the company's investment in testing equipment.

[0051] (3) Simple operation and improved efficiency In terms of operability and efficiency, the testing process eliminates the complex physical slicing operation and metallographic observation that relies on professional experience. Ordinary technicians can complete the process independently after simple training. The entire process for a single sample takes about 40-60 minutes, which is significantly shorter than the existing solution (single sample slicing plus observation takes 1-2 hours). It has the capability for rapid testing of batch samples.

[0052] (4) Wide adaptability In terms of adaptability, the method and device can be adapted to both the aluminum foil residual rate test of the R-angle arc-shaped sample after aluminum-plastic film punching and the aluminum foil thickness test of the flat sample. It takes into account both production line process quality monitoring and competitor material analysis scenarios, and has good compatibility and practicality for aluminum-plastic film products of different specifications and different layer structures.

[0053] The present invention will be further illustrated by the following examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0054] Example 1 This embodiment provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The specific process is as follows: Step 1: Sample Preparation The R-corner portion of the aluminum-plastic film after punching is taken as a sample, and the sample size is adapted to the groove of the arc-shaped bearing component.

[0055] Step 2: Sample fixation Fix the sample onto the sample carrier: embed the arc-shaped sample into the arc-shaped groove, ensuring that the sample fits the groove.

[0056] Step 3: High-temperature pyrolysis and inert gas protection Place the carrier with the sample fixed inside the high-temperature heating module 2 and close the door of the heating module 2; turn on the inert gas protection module and introduce inert gas into the heating module 2 to purge the air inside the chamber (preheating and ventilation time ≥ 5 min), and then keep the inert gas continuously introduced (ventilation rate of 8 L / min); start the high-temperature heating module 2 and raise the temperature to 575℃, and maintain this temperature for 15 min.

[0057] Step 4: Sample cooling and post-processing After heating is complete, turn off the high-temperature heating module 2 and continue to introduce inert gas until the sample cools down to below 200°C. Then transfer the sample and carrier to the cooling stage of the cooling module 3 and let it cool naturally to room temperature. After cooling, gently wipe the surface of the aluminum foil sample with a lint-free cloth to remove any remaining incompletely decomposed carbides and ensure that the sample surface is clean and free of impurities.

[0058] Step 5: Thickness Measurement and Data Processing The processed aluminum foil sample was placed on the measuring auxiliary platform of a micrometer. The micrometer was adjusted to the measuring pressure threshold. Five different measuring points were selected at the test site of the sample for measurement, and the thickness value of each measuring point was recorded. The average value of all measuring points was calculated as the final thickness of the aluminum foil sample.

[0059] Example 2 This embodiment provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Embodiment 1 is that the heating temperature in step 3 is 550℃.

[0060] Example 3 This embodiment provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Embodiment 1 is that the heating temperature in step 3 is 600℃.

[0061] Example 4 This embodiment provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Embodiment 1 is that the heating temperature in step 3 is 500℃ and the heating time is 20 min.

[0062] Example 5 This embodiment provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Embodiment 1 is that the heating temperature in step 3 is 700℃ and the heating time is 10 min.

[0063] Example 6 This embodiment provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Embodiment 1 is that: a flat part of the competitor's aluminum-plastic film is cut as a sample and cut to a size (2cm×2cm) that matches the flat carrier; and in step 2, the flat sample is laid flat on the flat carrier and covered with a ceramic pressing plate for fixation. The pressing pressure is such that it does not damage the sample or affect the volatilization of pyrolysis gases.

[0064] Comparative Example 1 This comparative example provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Example 1 is that the heating temperature in step 3 is 450°C.

[0065] Comparative Example 2 This comparative example provides a testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis. The difference from Example 1 is that the heating temperature in step 3 is 750°C.

[0066] Test case Test method: For all samples after implementation and comparative treatment, the thickness was measured at 5 points and the range was calculated.

[0067] The test results are shown in Table 1.

[0068] Table 1

[0069] As shown in Table 1, different pyrolysis conditions have a significant impact on the accuracy and repeatability of aluminum foil thickness measurement results. The specific analysis is as follows: In Examples 1-6, the organic layer was completely removed in Examples 1 and 6, with no deformation or residue in the aluminum foil, and the thickness remained stable at approximately 40 μm, with ranges of 0.4 and 0.3 respectively, demonstrating optimal measurement accuracy and repeatability. Examples 2 and 3 were performed at temperatures within the preferred range, resulting in good pyrolysis and thicknesses close to the standard value, with ranges of 0.6-0.7, indicating relatively good accuracy. Examples 4 and 5 were performed at temperatures that were too low or too high, leading to insufficient pyrolysis or slight overheating, resulting in slightly decreased data consistency, with a range of 0.8, but good accuracy. These data indicate that the present invention can achieve complete removal of the organic layer and intact preservation of the aluminum foil under conditions of 500-700℃ (preferably 550-600℃), with small measurement fluctuations and reliable results.

[0070] In Comparative Example 1 (450℃), the pyrolysis temperature was insufficient, leaving PET, PA, CPP, and adhesive residues on the aluminum foil surface. This resulted in a significantly higher measured thickness (average 41.62 μm), a range of 1.1, large data dispersion, and poor test accuracy. Comparative Example 2 (750℃) exceeded the aluminum foil's tolerance limit, causing melting, shrinkage, and severe deformation. The thickness fluctuated significantly between 36 and 39 μm, with a significantly lower average and a range of 2.6, exhibiting the worst measurement accuracy and failing to reflect the true aluminum foil thickness.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A testing method for aluminum-plastic film and aluminum foil based on high-temperature pyrolysis, characterized in that, Includes the following steps: In an inert atmosphere, the aluminum-plastic film sample to be tested is heated, and then the thickness of the cooled aluminum-plastic film sample is measured. The heating temperature is 500-700℃.

2. The method for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis according to claim 1, characterized in that, The heating temperature is 550-600℃.

3. The method for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis according to claim 1, characterized in that, The heating time is 10-20 minutes.

4. The method for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis according to claim 1, characterized in that, The cooling time is 15-20 minutes.

5. The method for testing aluminum-plastic film and aluminum foil based on high-temperature pyrolysis according to claim 1, characterized in that, The inert atmosphere uses gases including nitrogen and / or argon, with a gas flow rate of 5-10 L / min.

6. A testing apparatus based on the high-temperature pyrolysis-based aluminum-plastic film / aluminum foil testing method according to any one of claims 1-5, characterized in that, include: Heating module (2) is used to heat the aluminum-plastic film sample to be tested; An inert gas protection module is connected to the heating module (2) and is used to supply inert gas to the interior of the heating module (2); The cooling module (3) is used to cool the sample after it has been processed by the heating module (2); The thickness measurement module is used to measure the thickness of the sample after it has been processed by the cooling module (3).

7. The testing apparatus according to claim 6, characterized in that, It also includes a sample carrier module, which is disposed within the heating module (2) and is used to fix the aluminum-plastic film sample to be tested.

8. The testing apparatus according to claim 7, characterized in that, The sample carrying module includes an arc-shaped sample carrying component and / or a planar sample carrying component; The arc-shaped sample carrier is provided with a positioning groove that matches the contour of the aluminum-plastic film sample.

9. The testing apparatus according to claim 6, characterized in that, The inert gas protection module includes a gas storage tank (7) and a gas delivery pipe; One end of the gas guide pipe is connected to the gas storage tank (7), and the other end of the gas guide pipe is connected to the heating module (2).

10. The testing apparatus according to claim 6, characterized in that, The thickness measurement module includes a digital micrometer.

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