Method for testing leakage performance of breathable film

Abstract

Disclosed in the present invention is a method for testing the leakage performance of a breathable film, comprising: step 1, paving backing plates, placing a piece of pre-weighed filter paper on each backing plate, placing a suitable breathable film to be tested on each filter paper, and then placing a suitable piece of absorbent paper on each breathable film to be tested; step 2, pouring the same weight of test liquid in the center of each piece of absorbent paper, placing an acrylic plate on each piece of absorbent paper, placing a weight on each acrylic plate to form a plurality of test groups, and starting timing; step 3, removing the weight from one test group at regular intervals, inspecting the filter paper at the bottom of that group, and weighing the filter paper; and step 4, calculating the weight difference between each group of filter paper before and after testing at different time intervals, and using the weight difference as the basis to determine the leakage performance of the breathable film. A reasonable and effective leakage performance test of the breathable film is conducted in an intuitive manner.

Description

A method for detecting leakage performance of breathable film Technical Field

[0001] The present invention relates to the technical field of plastic films, and in particular to a method for detecting leakage performance of a breathable film. Background Art

[0002] Breathable films made from PE are widely used in sanitary products such as sanitary napkins, sleep pants, and nursing pads. Currently, these films are applied behind the absorbent layer as a protective layer to prevent leakage. Leakage resistance is a key factor in gaining user acceptance for sanitary napkins and other sanitary products. However, due to quality issues with the breathable film material, leakage often occurs in the final product during actual use.

[0003] In the existing technology, most breathable film leakage performance testing methods usually use physiological saline solution with color powder as a test fluid to simply simulate the composition of body fluids for leakage detection. The tester directly observes the leakage of the test fluid with the naked eye. This method can only simply detect whether there is leakage, but cannot effectively and directly reflect the leakage status of the breathable film material, and it cannot simulate the actual situation of customer use.

[0004] Summary of the Invention

[0005] In view of the technical defects existing in the background technology, the present invention proposes a method for detecting the leakage performance of a breathable film, which solves the above technical problems and meets practical needs. The specific technical solution is as follows:

[0006] A method for detecting leakage performance of a breathable film, comprising:

[0007] Step 1: Prepare a backing plate, multiple sheets of filter paper of the same specifications, multiple sheets of absorbent paper of the same specifications, multiple acrylic plates of the same size and weight, and multiple weights of the same weight. Weigh each filter paper and lay the backing plate in place. Then, place a sheet of filter paper on each backing plate. Next, place a sheet of breathable film of the appropriate size to be tested on each filter paper. Finally, place a sheet of absorbent paper of the appropriate size on each breathable film to be tested.

[0008] Step 2: Pour the same weight of test liquid into the center of each piece of absorbent paper. Then, place an acrylic plate on each piece of absorbent paper. Then, place a weight on each acrylic plate to form multiple test groups. Start timing.

[0009] Step 3: After a certain period of time, remove the weight of a test group, check the filter paper at the bottom of the group and weigh it;

[0010] Step 4: Calculate the weight difference between each set of filter paper after the test at different time periods and the filter paper before the test, and use this as a basis to judge the leakage performance of the breathable film.

[0011] In a further improved solution of the present invention, in step 2, the test solution is prepared by adding 5g of red food coloring and 70g of the simulated ingredient to every 1000ml of physiological saline solution.

[0012] In a further improved solution of the present invention, the simulation component includes hydroxyethyl starch and gelatin, and the weight ratio of the hydroxyethyl starch to the gelatin is 3:4.

[0013] In a preferred embodiment of the present invention, the weight is a 5 kg weight.

[0014] In a preferred embodiment of the present invention, the time is 10 minutes, 20 minutes, and 40 minutes respectively.

[0015] In a further improvement of the present invention, the results are determined based on the weight difference before and after measurement at different times, where the weight difference is less than 0.005g at 10 minutes, less than 0.007 at 20 minutes, and less than 0.01g at 40 minutes, indicating that the breathable film has qualified leakage performance.

[0016] The beneficial effects of the present invention are as follows: the present invention can perform reasonable and effective leakage performance testing on breathable films in an intuitive, easy-to-operate and quantitative manner, and provide corresponding qualified judgments. Developers of breathable film products can intuitively and accurately observe test results that are basically consistent with the actual user experience, allowing them to use the products with confidence in sanitary napkins, pajamas and other sanitary products. DETAILED DESCRIPTION

[0017] 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 only part of the embodiments of the present invention, not all of the 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.

[0018] The present invention is a method for detecting leakage performance of a breathable film, comprising:

[0019] Step 1: Prepare a backing plate, multiple sheets of filter paper of the same specifications, multiple sheets of absorbent paper of the same specifications, multiple acrylic plates of the same size and weight, and multiple weights of the same weight. Weigh each filter paper and lay the backing plate in place. Then, place a sheet of filter paper on each backing plate. Next, place a sheet of breathable film of the appropriate size to be tested on each filter paper. Finally, place a sheet of absorbent paper of the appropriate size on each breathable film to be tested.

[0020] Step 2: Pour the same weight of test liquid into the center of each piece of absorbent paper. Then, place an acrylic plate on each piece of absorbent paper. Then, place a weight on each acrylic plate to form multiple test groups. Start timing.

[0021] Step 3: After a certain period of time, remove the weight of a test group, check the filter paper at the bottom of the group and weigh it;

[0022] Step 4: Calculate the weight difference between each set of filter paper after the test at different time periods and the filter paper before the test, and use this as a basis to judge the leakage performance of the breathable film.

[0023] The impermeable plastic film used as the backing must be larger than the filter paper and absorbent paper. In this test method, the absorbent paper simulates the core layer and ensures that the same amount of test fluid remains concentrated and retained in the film sample area for a long time during the test, ensuring uniform test variables. For the same purpose, the breathable film sample to be tested must be sized to completely cover the filter paper, and the absorbent paper must be the same size as the breathable film sample to ensure that the entire breathable film sample is exposed to the same test environment during testing.

[0024] Existing test fluids use physiological saline to simulate human urine, which is the most common and reproducible test fluid for testing absorbent product performance. The present invention differs in that the test fluid used contains several common components used in the human body or other organisms, making it more suitable for practical use.

[0025] In the present invention, the configuration method of this test liquid is as follows: 5g of red food coloring and 70g of simulation components are added to every 1000ml of normal saline solution and formulated. It should be noted here that because normal saline is a solution that simulates the human body cell environment, it contains salts roughly the same as those in human blood. The red food coloring added can be used to mark the solution or help observe and identify different substances in an experiment. On the one hand, this will not change the permeability of the test liquid itself, and on the other hand, it will make the red color development more intuitive. These several substances are mixed together to produce a simulation test liquid with a specific color and viscosity.

[0026] In the present invention, the simulation components include hydroxyethyl starch and gelatin. Hydroxyethyl starch is a synthetic starch analog, which is selected here as a component of plasma or plasma substitute. Moreover, hydroxyethyl starch can not only increase the stability of the simulated blood, so that it maintains good physical and chemical properties during storage and use, but also adjust the osmotic pressure of the simulated blood, making it closer to the osmotic pressure of real blood, thereby maintaining the normal fluidity of the blood. Gelatin is a protein extracted from the bones or skin of animals (such as cattle and pigs). It can be added and used as an adhesive to make it closer to the viscosity of real blood. Here, the weight ratio of hydroxyethyl starch and gelatin is 3:4, which is similar to the component ratio of plasma and blood cells in real blood, so it can simulate certain functions and characteristics of real blood.

[0027] In specific tests, considering that the actual product is used as a nursing pad, when the user wears the nursing pad, in addition to the situation where the nursing pad is compressed and the breathable film is passively contacted with the exudate of the absorbent paper when sitting or lying down, the user is in an active state most of the time. At the same time, in order to be able to operate the test tool more quickly to add samples, conduct tests and take samples. In the test method disclosed in the present invention, the test liquid is dripped into the center of the absorbent paper, and then an acrylic plate is placed on the absorbent paper. Finally, a 5kg counterweight is applied to test the leakage of the breathable film. Here, the absorbent paper fully restores the state of the core after absorbing water. In this way, the situation where the user's clothes exert pressure on the absorbent product when they are in an active state can be restored, and the pressure in this situation generally does not exceed the pressure caused by the 5kg counterweight.

[0028] In order to collect leakage data of the breathable film to be tested as accurately as possible within a reasonable time, quantify the test results, and reduce errors caused by accidental factors, in the present invention, the data of the same breathable film to be tested is recorded at least once, and multiple groups of filter papers are used to check at different times and weigh them.

[0029] To quantify leakage performance, the test method disclosed in the present invention uses the weight difference between the filter paper before and after the test as the basis for judging the leakage performance of the breathable membrane. This allows testers to accurately quantify the leakage of the breathable membrane, shortens the time for recording and analyzing results, is beneficial for large-scale product performance testing, and also meets the fundamental purpose of accelerating technological research and development.

[0030] In the present invention, three groups are prepared for testing. The weight of the first test group is removed after 10 minutes of timing, the weight of the second test group is removed after 20 minutes of timing, and the weight of the third test group is removed after 40 minutes of timing. After each time the weight of the test group is removed, the filter paper at the bottom of the group is checked and weighed. The weight change facilitates the developer to judge the actual leakage performance of the test breathable film.

[0031] The results are judged based on the weight difference of the filter paper before and after the test at different times. When the weight difference of the filter paper is less than 0.005g at 10 minutes, less than 0.007g at 20 minutes, and less than 0.01g at 40 minutes, it indicates that the breathable film has qualified leakage performance.

[0032] In summary, the present invention can perform reasonable and effective leakage performance testing of breathable films in an intuitive, easy-to-operate, and quantitative manner, and provide corresponding qualified judgments. Developers of breathable film products can intuitively and accurately observe that the test results of the product are basically consistent with the actual user experience, allowing them to use them with confidence in products such as sanitary napkins, pajamas, and sanitary products.

[0033] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for detecting leakage performance of a breathable film, characterized in that: include; Step 1, prepare a pad, multiple filter papers of the same specifications, multiple absorbent papers of the same specifications, multiple acrylic plates of the same size and weight, and multiple weights of the same weight, weigh the weight of each filter paper, lay the pad, then lay a piece of filter paper on each pad, then lay a piece of breathable film to be tested of suitable size on each filter paper, and finally, place a piece of absorbent paper of suitable size on each breathable film to be tested; Step 2: Pour the same weight of test liquid into the center of each absorbent paper, then place an acrylic plate on each absorbent paper, and then place a weight on each acrylic plate to form multiple test groups, and start timing; Step 3: After a certain period of time, remove the weight of a test group, check the filter paper at the bottom of the group and weigh it; Step 4: Calculate the weight difference between each set of filter paper after the test at different time periods and the filter paper before the test, and use this as a basis to judge the leakage performance of the breathable film.

2. The method for detecting leakage performance of a breathable film according to claim 1, characterized in that: In step 2, the test solution is prepared by adding 5 g of red food coloring and 70 g of the simulated component to every 1000 ml of physiological saline solution.

3. The method for detecting leakage performance of a breathable film according to claim 2, characterized in that: The simulation component includes hydroxyethyl starch and gelatin, and the weight ratio of the hydroxyethyl starch to the gelatin is 3:

4.

4. The method for detecting leakage performance of a breathable film according to claim 1, characterized in that: The weight is a 5 kg weight.

5. The method for detecting leakage performance of a breathable film according to claim 1, characterized in that: In step 3, the times are 10 min, 20 min, and 40 min respectively.

6. The method for detecting leakage performance of a breathable film according to claim 5, characterized in that: The results were determined based on the weight difference before and after measurement at different times. When the weight difference was <0.005g at 10min, <0.007 at 20min, and <0.01g at 40min, it indicated that the breathable film had qualified leakage performance.