Method for detecting adhesion quality of inner coating film of easy-open lid

Abstract

This invention discloses a method for testing the adhesion quality of the inner coating of easy-open caps, comprising the following steps: S1, Sampling: Sampling easy-open cap samples to be tested according to the sampling plan; S2, First Cooling: Placing the samples in a first freezing zone for cold storage; S3, Pasteurization: After cold storage for a period of time, removing the samples from the first freezing zone and placing them in a high-temperature zone for sterilization; S4, Second Cooling: After sterilization for a period of time, removing the samples from the high-temperature zone and placing them in a second freezing zone for cold storage; S5, State Comparison: After cold storage for a period of time, removing the samples and comparing them with standard samples to observe the state of the inner coating inside the easy-open cap; S6, Test Samples: Opening the pull tab of a sample that meets the requirements, and observing the residual state of the inner coating in the easy-open cap; S7, Determining the Test Results. This method for testing the adhesion quality of the inner coating of easy-open caps simulates extreme usage conditions of sudden cooling and heating during the testing process, and has the advantage of comprehensively evaluating whether the adhesion quality of the inner coating of easy-open caps meets the standards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection methods for inner coating film adhesion quality, and particularly relates to a detection method for inner coating film adhesion quality of an easy-open lid. BACKGROUND

[0002] Aluminum easy-open cans are commonly used packaging containers in the beverage and food industry, and the easy-open lid, as one of the components of the easy-open can, is coated with an organic protective coating film (mostly ethylene resin) on the inner and outer surfaces during production to prevent corrosion caused by food and avoid the dissolution of metal ions, thereby protecting the quality of the contents during storage and maintaining good original flavor performance. In addition, some manufacturers print promotional information on the inner coating film. The standards for easy-open can production and testing are GB / T9106.1 "Packaging Containers Easy-Open Can Part 1: Aluminum Easy-Open Lid Aluminum Can", which requires that the inner and outer coating films should be solidified and well adhered.

[0003] Currently, the adhesion quality of the inner coating film of the easy-open lid is detected by the pasteurization method. However, since the easy-open lid may be subjected to extreme use conditions such as sudden cooling and heating during use and storage, simple pasteurization cannot comprehensively evaluate whether the adhesion quality of the inner coating film of the easy-open lid meets the standards under temperature changes. In actual applications, especially in cities with high temperatures such as Guangdong, there have been cases where the inner coating film separates from the ring piece after the ring of the finished easy-open can is opened, causing some of the inner coating film to be torn and the printed information in the inner coating film to be unclear. In some cases, the inner coating film completely separates from the ring piece, resulting in the contents being unable to be poured out.

[0004] Therefore, the present application provides a detection method for the adhesion quality of the inner coating film of an easy-open lid. SUMMARY

[0005] The present application provides a detection method for the adhesion quality of the inner coating film of an easy-open lid, which aims to solve the problem that simple pasteurization cannot comprehensively evaluate whether the adhesion quality of the inner coating film of the easy-open lid meets the standards, resulting in the inner coating film separating from the ring piece after the ring of the finished easy-open can is opened.

[0006] The present application adopts the following technical solutions:

[0007] A detection method for the adhesion quality of the inner coating film of an easy-open lid, the easy-open lid comprising an easy-open lid body, a ring piece, a ring fixedly connected with the ring piece, and an inner coating film pasted with the inside of the easy-open lid body and the ring piece, the easy-open lid body being provided with an opening matched with the ring piece, and the ring being used to pull the ring piece out of the opening; the detection method comprising the following steps:

[0008] S1, sampling: sampling the easy-open lid to be detected according to a sampling scheme;

[0009] S2, first cooling: the sample is placed in the first refrigeration zone for cold storage;

[0010] S3, pasteurization: after a period of cold storage, the sample in the first refrigeration zone is taken out and placed in a high-temperature zone for sterilization;

[0011] S4, second cooling: after a period of sterilization, the sample in the high-temperature zone is taken out and placed in the second refrigeration zone for cold storage;

[0012] S5, state comparison: after a period of cold storage, the sample is taken out and compared with a standard sample to observe the internal coating film state of the easy-to-open cover;

[0013] S6, test sample: the pull ring of the sample that passes the opening state is observed to observe the residue of the internal coating film of the easy-to-open cover;

[0014] S7, determine the test result.

[0015] Further improvement of the technical scheme of the application, in step S2, the temperature of the first refrigeration zone is 0-5℃, and the cooling time is 30-40min;

[0016] The first refrigeration zone is used to simulate the low-temperature production process of the easy-to-open can product.

[0017] Further improvement of the technical scheme of the application, in step S3, the high-temperature zone is a water bath with a temperature of 65-70℃, the sample is placed in the water bath with a temperature of 65-70℃, the water level is completely submerged, and the sample is soaked for 30-40min at a constant temperature;

[0018] The high-temperature zone is used to simulate the high-temperature production process and high-temperature storage process of the easy-to-open can product.

[0019] Further improvement of the technical scheme of the application, in step S3, the water level is completely submerged, and the sample is at least 2mm away from the water surface.

[0020] Further improvement of the technical scheme of the application, in step S4, the temperature of the second refrigeration zone is 0-5℃, and the cooling time is 30-40min;

[0021] The second refrigeration zone is used to simulate the low-temperature storage process of the easy-to-open can product.

[0022] Further improvement of the technical scheme of the application, in step S4, the sample in the high-temperature zone is taken out, the water on the sample is wiped clean, and then the sample is placed in the second refrigeration zone for cold storage.

[0023] Further improvement of the technical scheme of the application, in step S5, the internal coating film state includes discoloration, blistering and peeling.

[0024] Further as the improvement of the technical scheme of the present application, in step S6, whether there is a feather film remaining on the edge of the opening is observed;

[0025] If yes, the remaining width of the feather film is measured, when the feather film width ≤1mm, the detection result of the sample is qualified; when the feather film width >1mm, it is determined that the sample detection is unqualified;

[0026] If no, the detection result of the sample is qualified.

[0027] Further as the improvement of the technical scheme of the present application, the feather film is the inner coating film remaining on the edge of the opening after the pull ring is opened.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The detection method for the adhesion quality of the inner coating film of the easy-open cover provided by the present application, through sampling, first cooling, pasteurization, second cooling, and testing the sample, finally determines the detection result, through the first cooling and the second cooling, simulates the low-temperature production process and the low-temperature storage process of the easy-open can product containing the easy-open cover, through the pasteurization, simulates the high-temperature production process and the high-temperature storage process of the easy-open can product containing the easy-open cover, simulates the extreme use conditions such as sudden cooling and sudden heating of the easy-open cover, so as to comprehensively evaluate whether the adhesion quality of the inner coating film of the easy-open cover meets the standard in the extreme temperature difference change; the detection method is simple in operation and simple in detection equipment, and can be satisfied by an ordinary laboratory without the need of adding additional detection equipment, and can be applied to the easy-open cover manufacturers, avoids that the problem products are supplied to the downstream industry, and can also be applied to the purchase detection of the enterprises using the easy-open cover, avoids that the problem products are put into production and flow into the market. The detection method for the adhesion quality of the inner coating film of the easy-open cover has the characteristics of comprehensively evaluating whether the adhesion quality of the inner coating film of the easy-open cover meets the standard in the process of detection. BRIEF DESCRIPTION OF DRAWINGS

[0030] The technology of the present application will be further described in detail below in combination with the drawings and specific embodiments:

[0031] Fig. 1 is a detection step schematic diagram of the detection method for the adhesion quality of the inner coating film of the easy-open cover;

[0032] Fig. 2 is a front view schematic diagram of the easy-open cover;

[0033] Fig. 3 is a structure schematic diagram of the easy-open cover body and the feather film in the easy-open cover;

[0034] Fig. 4 is a structure schematic diagram of the pull ring sheet and the inner coating film in the easy-open cover.

[0035] Reference signs:

[0036] 1, easy open lid body; 2, pull tab piece; 3, pull tab; 4, inner coating film; 5, opening; 6, feather film. DETAILED DESCRIPTION

[0037] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and the drawings, so as to fully understand the purpose, scheme and effect of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The same reference signs used in the drawings indicate the same or similar parts.

[0038] It should be noted that, unless otherwise specified, when a certain feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right and the like used in the present application are only relative to the mutual position relationship of the components of the present application in the drawings.

[0039] A detection method for the adhesion quality of an inner coating film of an easy open lid, with reference to Figs. 1 to 4 The easy open lid comprises an easy open lid body 1, a pull tab piece 2, a pull tab 3 and an inner coating film 4.

[0040] The pull tab 3 is fixedly connected with the pull tab piece 2, the inner coating film 4 is pasted and matched with the inside of the easy open lid body 1 and the inside of the pull tab piece 2, the easy open lid body 1 is provided with an opening 5 matched with the pull tab piece 2, and the pull tab 3 is used to pull out the pull tab piece 2 from the opening 5; the detection method comprises the following steps:

[0041] S1, sampling: 13 easy open lids to be detected of production batch number 1872720-14 are randomly selected as samples according to a sampling scheme;

[0042] S2, first cooling: the samples are placed in a first refrigeration zone at-20-5℃ for cold storage for 30 min; the first refrigeration zone can be set at 0-4℃ to simulate the low-temperature production process of the easy open lid-containing pop can product;

[0043] S3, pasteurization: after cold storage for 30 min, the samples in the first refrigeration zone are taken out and placed in a water bath at 68±2℃ for sterilization, so that the water level completely immerses the samples, the samples are at least 2 mm away from the water surface, and constant temperature immersion is performed for 30 min; the high-temperature zone not only can simulate the high-temperature production process of the easy open lid-containing pop can product, but also can simulate the temperature in the transportation process and storage in Guangdong Province in summer; placing the immersed samples at a distance of 2 mm from the water surface can ensure that the temperature of the whole body of the samples is maintained at 68±2℃, so as to avoid that some parts of the samples are too close to the water surface, resulting in insufficient temperature.

[0044] S4, second cooling: after sterilization for 30 minutes, the sample in the high temperature zone is taken out, the water on the sample is wiped off, and then the sample is placed in a second refrigeration zone for cold storage for 30 minutes. The second refrigeration zone can be set at 0-4°C to simulate the low-temperature storage process of a pop-top can product with an easy-to-open cover. Of course, the temperature of the second refrigeration zone can also be set below -18°C to simulate the use of a refrigerator freezing zone. Avoiding setting the temperature of the second refrigeration zone below -18°C, because the sample is wet, the pull ring cannot be opened.

[0045] S5, state comparison: after cold storage for 30 minutes, the sample is taken out and compared with the standard sample to observe whether discoloration, blistering and peeling occur in the inner coating film of the easy-to-open cover.

[0046] S6, test sample: the pull ring of the sample that passes the opening state is observed to observe the residue of the inner coating film in the easy-to-open cover. First, the feather film residue on the edge of the hole can be observed. If yes, the residue width of the feather film is measured. When the feather film width is less than or equal to 1 mm, the sample passes the test. When the feather film width is greater than 1 mm, the sample fails the test. If no, the sample passes the test. At the same time, the adhesion of the inner coating film on the pull ring sheet can also be observed to detect the residue width of the feather film on the edge of the pull ring sheet. When the feather film width is less than or equal to 1 mm, the sample passes the test. When the feather film width is greater than 1 mm, the sample fails the test. The feather film is the inner coating film that is torn off after the pull ring is opened and remains on the edge of the hole or the edge of the pull ring sheet.

[0047] S7, determine the test result.

[0048] In a control example, the GB pasteurization method is used for detection:

[0049] 1) According to the sampling scheme, 13 easy-to-open covers to be tested of the same batch (batch number 1872720-14) are randomly selected as control samples;

[0050] 2) The control samples are placed in a 68±2°C water bath, ensuring that the water level completely submerges the samples, and the samples are at least 2mm from the water surface, and are constantly soaked for 30 minutes;

[0051] 3) The control samples are taken out and compared with the standard samples to observe whether discoloration, blistering and peeling occur in the inner coating film of the easy-to-open cover;

[0052] 4) The pull ring of the sample that passes the opening state is observed to observe the residue of the inner coating film in the easy-to-open cover;

[0053] 5) Determine the test result.

[0054] Comparison of the two detection methods:

[0055]

[0056] Among them, by sampling-the first cooling-pasteurization-the second cooling-test sample, finally determine the test results, by the first cooling and the second cooling simulation respectively simulate the low temperature production process and low temperature storage process of the pull ring can product containing easy open cover, by pasteurization simulate the high temperature production process and high temperature storage process of the pull ring can product containing easy open cover, simulate the sudden cooling and sudden heating of the easy open cover in extreme use conditions, so as to comprehensively evaluate whether the adhesion quality of the easy open cover coating film meets the standard in extreme temperature difference change; The detection method is simple to operate, the detection equipment is simple, and the ordinary laboratory can meet the needs, without adding additional detection equipment, which can be applied to easy open cover manufacturers, avoiding problem products supplied to downstream industries, and also can be applied to purchase detection of enterprises using easy open cover, avoiding problem products on-line production flow into the market. The detection method of the adhesion quality of the easy open cover coating film 4 has the characteristics of comprehensively evaluating whether the adhesion quality of the easy open cover coating film meets the standard in the process of detection, simulating the extreme use conditions of sudden cooling and sudden heating.

[0057] In the comparison of the detection method, it is found that under the condition of normal detection by the conventional national standard pasteurization method, the use of the detection method can detect that there is still one easy open cover unqualified; Compared with the conventional national standard pasteurization method, the detection method can improve the detection rate of the easy open cover with unqualified inner coating film adhesion quality, and more easily find the problem easy open cover.

[0058] Other contents of the detection method of the adhesion quality of the easy open cover coating film of the present application are referred to the prior art, and will not be repeated here.

[0059] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Therefore, any modification, equivalent change and modification of the above embodiment according to the technical essence of the present application, without departing from the technical scheme content of the present application, still belongs to the scope of the technical scheme of the present application.

Claims

1. A method for detecting the adhesion quality of the inner coating of an easy-open cap, characterized in that, The easy-open cap includes an easy-open cap body, a pull ring, a pull ring fixedly connected to the pull ring, and an inner coating film adhered to the inside of the easy-open cap body and the inside of the pull ring. The easy-open cap body has an opening adapted to the pull ring, and the pull ring is used to pull the pull ring out from the opening. The detection method includes the following steps: S1. Sampling: Select easy-open lid samples to be tested according to the sampling plan; S2. First cooling: The sample is placed in the first freezing zone for cold storage. The temperature of the first freezing zone is 0-5℃ and the cooling time is 30-40 minutes. The first freezing zone is used to simulate the low-temperature production process of products with easy-open lids. S3. Pasteurization: After a period of cold storage, the sample from the first freezing zone is taken out and placed in the high-temperature zone for sterilization. The high-temperature zone is a water bath with a temperature of 65-70℃. The sample is placed in the 65-70℃ water bath, ensuring that the water level completely submerges the sample and that the sample is at least 2mm below the water surface. The sample is then soaked at a constant temperature for 30-40 minutes. The high-temperature zone is used to simulate the high-temperature production and storage process of products with easy-open lids. S4. Second Cooling: After sterilization for a period of time, the sample from the high-temperature zone is taken out, the water on the sample is wiped off, and then it is placed in the second freezing zone for cold storage. The temperature of the second freezing zone is 0-5℃, and the cooling time is 30-40 minutes. The second freezing zone is used to simulate the low-temperature storage process of products with easy-open cans. S5. State comparison: After a period of cold storage, take out the sample and compare it with the standard sample to observe the state of the inner coating inside the easy-open cap. S6. Test sample: For the pull ring of the sample that is in the open state and is qualified, observe whether there is any feather film residue on the edge of the opening. If so, measure the residual width of the plume. If the plume width is ≤1mm, the sample test result is qualified; if the plume width is >1mm, the sample test result is deemed unqualified. If not, the sample's test results are qualified; S7. Determine the test results.

2. The method for detecting the adhesion quality of the inner coating of the easy-open cap according to claim 1, characterized in that: In step S5, the inner coating film state includes discoloration, bubbling, and peeling.

3. The method for detecting the adhesion quality of the inner coating of the easy-open cap according to claim 1, characterized in that: The feather film is the inner coating film that remains on the edge of the opening after the pull ring is opened.

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