CN113567228A - Method for testing explosion-proof performance of electronic screen protective film - Google Patents
Method for testing explosion-proof performance of electronic screen protective film Download PDFInfo
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- CN113567228A CN113567228A CN202110633021.7A CN202110633021A CN113567228A CN 113567228 A CN113567228 A CN 113567228A CN 202110633021 A CN202110633021 A CN 202110633021A CN 113567228 A CN113567228 A CN 113567228A
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- 230000001681 protective effect Effects 0.000 title claims abstract description 72
- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000011521 glass Substances 0.000 claims abstract description 91
- 238000009863 impact test Methods 0.000 claims abstract description 21
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000005341 toughened glass Substances 0.000 abstract description 14
- 239000000758 substrate Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000004880 explosion Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for testing the explosion-proof performance of an electronic screen protective film, which comprises the following steps: 1) measuring the limit height of the mother glass, namely the critical N value; 2) sticking a protective film on the surface of the same glass, and measuring the limit height of the protective film and the glass to obtain a critical M value; 3) adding N and M to obtain a test height; 4) the protective film and the mother glass to be tested are subjected to ball drop impact test at the test height, the fracture condition is recorded, and the fracture rate R is calculatedn(ii) a 5) Selecting a standard film and the plain glass to perform a ball drop impact test at the same test height, recording the fracture condition, and calculating the fracture rate R; 6) and calculating the difference value of the R and the Rn, and judging the explosion-proof performance of the protective film. The invention adopts the plain glass as the test substrate, can avoid the measurement error caused by the difficulty in controlling the quality of the tempered glass, and better reflects the explosion-proof performance of the protective film. And similar products are introduced as comparison standards, so that the explosion-proof performance of the protective film to be tested can be evaluated more objectively.
Description
Technical Field
The invention relates to the technical field of electronic screen protective film testing, in particular to a method for testing the explosion-proof performance of an electronic screen protective film.
Background
The mobile phone explosion-proof membrane is a membrane which can effectively buffer impact and prevent a screen from bursting when a mobile phone screen is impacted or falls off, or prevent a glass panel from being broken and scattered due to accidental impact of a mobile phone, so that hidden damage to the glass panel is reduced, and the safety of a user is guaranteed; can also maintain the special luster and texture of the tempered glass and improve the surface hardness.
The explosion-proof performance test of the electronic screen protective film is mainly carried out by using a falling ball drop test instrument, but when the membrane is tested, the test cannot be carried out on each membrane, so that the explosion-proof performance of each material is difficult to determine. It is not realistic to use real electronics to test for damage that is too severe. According to the traditional test method, materials are directly attached to toughened glass, a 64g small steel ball is directly used for falling ball drop test, 1 group of glass with the same height and the same gram number falls to the same point for 3 times, 3 times of glass is not cracked, 5 groups of glass with the same height are regarded as the allowable explosion-proof height, the film can pass the allowable explosion-proof height through verification, the falling height of the small ball can be continuously increased until the explosion-proof limit height of the protection film (namely the height of the protection film which is just cracked) is tested, and the height of the protection film without the damage of the glass and the film is the explosion-proof height. However, in the process of using the test method, the explosion-proof performance of the product is somewhat 1.2m, and some of the explosion-proof performance can reach 1.8m, so the difference of the explosion-proof performance is caused because the quality and the material of the used toughened glass are difficult to unify, and the test value of the explosion-proof performance is deviated.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for testing the explosion-proof performance of an electronic screen protective film, which adopts non-tempered plain glass as a substrate, can reduce influencing factors in the processing process and can more accurately test the explosion-proof performance of a product.
The purpose of the invention is realized by adopting the following technical scheme:
a method for testing the explosion-proof performance of an electronic screen protective film comprises the following steps:
1) selecting a plurality of pieces of mother glass with the same thickness; the plain glass is glass which is not subjected to toughening processing and is easy to break.
2) Performing a ball drop impact test on one surface of the mother glass, and gradually increasing the drop height of the small balls to test until the mother glass is broken, wherein the height before the glass is broken is a limit height (also called an explosion-proof height) and is called a critical N value of the mother glass;
3) taking another piece of plain glass in the step 1), and attaching a protective film on the surface of the plain glass to obtain a test surface;
4) performing a ball drop impact test on the test surface in the step 3), and performing the test by gradually increasing the drop height of the small balls until the mother glass cover plate is broken, wherein the height before breaking is the limit height and is called as the critical M value of the protective film; wherein, the quality of the small balls in the step 4) is the same as that of the small balls in the step 2);
5) adding the N value obtained in the step 2) and the M value obtained in the step 4) to obtain a test height;
6) taking another piece of plain glass in the step 1), pasting a protective film on the plain glass, then carrying out a ball drop impact test on the surface pasted with the protective film at the test height of the step 5), recording the crushing condition of the protective film and/or the plain glass according to a formula
Calculating to obtain the breakage rate R of the product to be detectedn；
7) Taking another piece of plain glass in the step 1), pasting a standard film on the plain glass, then carrying out a ball drop impact test on the surface pasted with the standard film at the test height in the step 5), recording the crushing condition of the standard film and/or the plain glass, and then using a formula
Calculating to obtain the breakage rate R of the standard film, and comparing the breakage rate R of the standard film with the breakage rate R of the product to be detected obtained in the step 6)nComparing, and judging the explosion-proof performance of the protective film; wherein, the quality of the small balls used in the step 6) and the step 7) is the same.
The standard membrane is the most common explosion-proof membrane, the change parameters of materials are less, the explosion-proof performance of products can be obviously compared by comparing the breakage rate measured at the same height because the explosion-proof performance of the membrane to be measured is not determined, and the selection of the standard membrane can be used as a reference object to well judge the explosion-proof performance of various products.
Further, in the step 1), an adhesive is attached to one surface of the mother glass, and the adhesive is AB adhesive.
Further, in the step 1), the thickness of the mother glass is 0.3-0.5 mm.
Further, in the step 2), the mass of the small balls is 60-800 g.
And further, in the step 4), the falling position of the small ball is calibrated before the ball falling impact test, and the small ball is adjusted to fall on the test surface.
Further, in step 4), at least three test sites are provided on each test surface, and if no protective film and/or plain glass cover plate is broken for three times, 1 group passes, and at least 15 groups are tested.
Still further, in step 6), R-R is calculated according to the formulanCalculating a difference value r, and judging that the explosion-proof performance standard of the protective film is as follows: when r is less than 10%, the explosion-proof performance does not meet the standard; when r is more than or equal to 10% and less than 30%, the explosion-proof performance is general; when r is more than or equal to 30% and less than 50%, the explosion-proof performance is good; when r is more than or equal to 50% and less than 80%, the explosion-proof performance is better; when r is more than or equal to 80 percent, the explosion-proof performance is very good.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the non-tempered plain glass as the test substrate, the plain glass is weaker than the tempered glass used by the conventional mobile phone screen, and if the protective film can pass through the explosion-proof height of the plain glass, the explosion-proof height of the tempered glass used by the mobile phone screen can certainly pass through. The plain glass is not influenced by tempering time and tempering materials, and measurement errors caused by difficulty in controlling the quality of the tempered glass can be avoided. The test method can better eliminate factors of the glass substrate and materials, better embody the explosion-proof performance of the protective film and better embody the protection of the protective film on the electronic screen.
The invention limits the test height of the product with the test height of the protective film to be tested to be the sum of the critical N value of single glass and the critical M value of the protective film attached to the surface of the same glass cover plate, tests the breaking condition of the protective film and/or the single glass at the test height, and calculates the breaking rate R of the product to be testedn. And selecting a standard film as a comparison standard, carrying out ball drop impact test on the standard film at the height of N + M and with the same ball mass, recording the crushing condition of the standard film and/or the mother glass, and calculating the crushing rate R of the standard film. And calculating the difference value of the R and the Rn, and judging the explosion-proof performance of the product to be detected. The test method of the invention introduces the standard film as the reference, and can objectively evaluate the explosion-proof performance of the protective film to be tested.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
Example 1
A method for testing the explosion-proof performance of an electronic screen protective film comprises the following steps:
1) the surface of the plain glass which is not subjected to numerical control processing is attached with AB glue, so that glass fragments are prevented from splashing when the small balls drop the glass;
2) the method comprises the following steps of carrying out a ball falling impact test of small balls with specific mass on the surface, adhered with AB glue, of the mother glass, increasing the falling height of the small balls for testing until the mother glass is broken, wherein the height before the breakage is a limit height which is called as a critical N value of the mother glass, and if the small balls are tested in multiple groups, selecting the minimum explosion-proof height, wherein the specific data are as follows:
table 1 explosion proof height data for plain glass of example 1
As can be seen, the critical N value of the mother glass used in example 1 is 0.1 m.
3) Selecting a protective film which is polished to IP12.6.1 model, uncovering a release film on the surface, attaching the protective film on the surface of the plain glass cover plate which is the same as the plain glass in the step 1) in parallel, using a scratch card to scratch and remove air bubbles, wherein impurity points and upwarp can not exist, and the surface attached with the protective film is a test surface;
4) before testing, the height of a ball falling impact testing machine is adjusted to a relative testing height, then the falling position of a steel ball is calibrated, the steel ball can be ensured to smoothly fall on a testing surface, and glass fragments on a bottom plate (an acrylic plate) of the machine are cleaned before testing; the acrylic plate needs to be cleaned once when each group of the glass cover plate is replaced.
5) And (3) performing a ball drop impact test on the test surface in the step 3), placing a test sample plate on a steel ball drop position, starting to test a point where 1 group of glass cover plates have the same height and drop for 3 times and are not cracked for 3 times, regarding that 1 group passes, testing the previous height of the just damaged height of the limit height (namely the plain glass or the protective film) of the material, and testing 15 groups under the same condition, wherein the 15 groups pass to obtain the explosion-proof height of the protective film. The critical M value, referred to as the protective film, is specified in the following table:
table 2 explosion-proof height of protective film of example 1 attached to mother glass cover plate
From this, it is known that N of the mother glass is 0.1, the explosion proof height of the protective film is 1.5M, and the critical M value of the protective film is 1.4M from N + M.
5) Adding the N value obtained in the step 2) and the M value obtained in the step 4) to obtain a test height;
in the embodiment, the ball impact test uses 300g of small balls, and the mass of the mobile phone is mainly 300-500 g because the mobile phone in the market is basically light and thin and the weight of most mobile phones is not more than 300 g. In the same manner as in steps 1) to 4), a plurality of sets of tests were carried out using glass cover plates having N of 0M and N of 0.2M and explosion-proof heights of 1.4M and 1.6M, respectively, whereby it was determined that the explosion-proof height of the product at 300g was 1.5M and the M value at 300g pellet weight of the protective film was 1.4M. The formula of the product can be expressed by N +1.4, the formula is directly used for carrying out ball falling impact test under the explosion-proof height to detect whether the explosion-proof performance of the product passes or not, and the explosion-proof height of the product corresponds to the lowest screen breaking rate.
6) The mother glass with the protective film is subjected to a ball drop impact test at the test height of the step 5), and the breakage of the protective film and/or the mother glass is recorded (wherein the mother glass N is measured to be 0.1m), specifically as shown in the table 3, according to the formula
Calculating to obtain the breakage rate R of the product to be detectedn；
TABLE 3 crushing behavior of the product to be tested of example 1 at an explosion protection height of 1.5m
Note: "OK" means that neither the protective film nor the glass cover plate was broken, and "NG" means that the protective film and/or the glass cover plate was broken.
7) Selecting a standard film and the same type of mother glass as the standard film in the step 6) to perform a ball drop impact test at the test height in the step 5), recording the crushing condition of the standard film and/or the mother glass, and using a formula to obtain the specific data shown in the table 4
Calculating to obtain the breakage rate R of the standard film, and comparing the breakage rate R of the standard film with the breakage rate R of the product to be detected obtained in the step 6)nComparing, and judging the explosion-proof performance of the protective film; wherein, the small particles used in the step 6) and the step 7)The ball mass is the same.
TABLE 4 fragmentation of the standard membrane of example 1 at an explosion protection height of 1.5m
Note: "OK" means that neither the protective film nor the glass cover plate was broken, and "NG" means that the protective film and/or the glass cover plate was broken.
According to the formula R ═ R-RnCalculating a difference value r, and judging that the explosion-proof performance standard of the protective film is as follows: when r is less than 10%, the explosion-proof performance does not meet the standard; when r is more than or equal to 10% and less than 30%, the explosion-proof performance is general; when r is more than or equal to 30% and less than 50%, the explosion-proof performance is good; when r is more than or equal to 50% and less than 80%, the explosion-proof performance is better; when r is more than or equal to 80 percent, the explosion-proof performance is very good. From tables 3-4, it can be calculated that: the protective film has good explosion-proof performance as shown in a check table, wherein R is 53.33 percent, Rn is 13.33 percent, and R-Rn is 40 percent.
Verification example
The same type of protective film was tested in the validation example and example 1, and the standard films used were the same. The difference lies in that: the verification example adopts a glass cover plate which is tempered for five hours, and AB glue is not adhered to the surface of the glass cover plate.
1) The method comprises the following steps of carrying out a ball falling impact test of small balls with specific mass on tempered glass for five hours, increasing the falling height of the small balls, and testing until the tempered glass is broken, wherein the height before breakage is a limit height and is called as a critical N value of the tempered glass, and the specific data are as follows:
table 5 explosion-proof height data of tempered glass of example 1
Therefore, the critical N value of the toughened glass selected in the verification example is 0.8 m.
Since the protective film to be measured of the verification example is the same as the protective film of the embodiment 1, the detection height is obtained by directly calculating with N +1.4m, namely 2.2 m. However, since the test height of the ball drop impact tester used was 2m, the test height of this test was 2 m.
The breaking condition of the protective film and/or the toughened glass is tested by the height of 2m, the specific data is shown in the table 5, and the formula is further used
Calculating to obtain the breakage rate R of the product to be detectedn，
TABLE 6 crushing of the product to be tested of example 1 at an explosion protection height of 2m
Note: "OK" means that neither the protective film nor the glass cover plate was broken, and "NG" means that the protective film and/or the glass cover plate was broken.
As can be seen from table 6, the product to be tested does not crack even when the explosion-proof height is 2M, and it can be truly proved that if the protective film to be tested passes the N + M test height of the mother glass, the explosion-proof performance of the protective film attached to the tempered glass is good. The test method can better eliminate factors of glass and materials, better embody the explosion-proof performance of the product and better embody the protection of the product on the screen.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. A method for testing the explosion-proof performance of an electronic screen protective film is characterized by comprising the following steps:
1) selecting a plurality of pieces of mother glass with the same thickness;
2) performing a ball drop impact test on one surface of the mother glass, and gradually increasing the drop height of the small balls to test until the mother glass is broken, wherein the height before the glass is broken is a limit height and is called as a critical N value of the mother glass;
3) taking another piece of plain glass in the step 1), and attaching a protective film on the surface of the plain glass to obtain a test surface;
4) performing a ball drop impact test on the test surface in the step 3), and performing the test by gradually increasing the drop height of the small balls until the mother glass cover plate is broken, wherein the height before the glass is broken is the limit height and is called as the critical M value of the protective film; wherein, the quality of the small balls in the step 4) is the same as that of the small balls in the step 2);
5) adding the N value obtained in the step 2) and the M value obtained in the step 4) to obtain a test height;
6) taking another piece of plain glass in the step 1), pasting a protective film on the plain glass, then carrying out a ball drop impact test on the surface pasted with the protective film at the test height of the step 5), recording the crushing condition of the protective film and/or the plain glass according to a formula
Calculating to obtain the breakage rate R of the product to be detectedn；
7) Taking another piece of plain glass in the step 1), pasting a standard film on the plain glass, then carrying out a ball drop impact test on the surface pasted with the standard film at the test height in the step 5), recording the crushing condition of the standard film and/or the plain glass, and then using a formula
Calculating to obtain the breakage rate R of the standard film, and calculating the breakage rate R of the standard film according to the stepThe breakage rate R of the product to be measured obtained in the step 6)nComparing, and judging the explosion-proof performance of the protective film; wherein, the quality of the small balls used in the step 6) and the step 7) is the same.
2. The method for testing the explosion-proof performance of the electronic screen protective film according to claim 1, wherein in the step 1), an adhesive is attached to one surface of the plain glass, and the adhesive is AB adhesive.
3. The method for testing the explosion-proof performance of the electronic screen protective film according to claim 1, wherein in the step 1), the thickness of the mother glass is 0.3-0.5 mm.
4. The method for testing the explosion-proof performance of the electronic screen protective film as claimed in claim 1, wherein in the step 2), the mass of the small balls is 60-800 g.
5. The method for testing the explosion-proof performance of the electronic screen protective film as claimed in claim 1, wherein in the step 4), the falling position of the small ball is calibrated before the ball drop impact test, and the small ball is adjusted to fall on the test surface.
6. The method for testing the explosion-proof performance of the protective film of the electronic screen as claimed in claim 1, wherein in the step 4), at least three test points are arranged on each test surface, and if no protective film and/or plain glass is broken for three times, 1 group passes, and at least 15 groups are tested.
7. The method for testing the explosion-proof performance of the protective film of the electronic screen as claimed in claim 1, wherein in the step 6), according to the formula R-RnCalculating a difference value r, and judging that the explosion-proof performance standard of the protective film is as follows: when r is less than 10%, the explosion-proof performance does not meet the standard; when r is more than or equal to 10% and less than 30%, the explosion-proof performance is general; when r is more than or equal to 30% and less than 50%, the explosion-proof performance is good; when r is more than or equal to 50% and less than 80%, the explosion-proof performance is better; when r is more than or equal to 80 percent, the explosion-proof performance is very good.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114459923A (en) * | 2022-01-29 | 2022-05-10 | 贵州大学 | Simple and convenient pre-testing method for explosion-proof performance of same type of carcass material |
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| CN210773811U (en) * | 2019-12-16 | 2020-06-16 | 淮南铂众光电科技有限公司 | Tester for mobile phone toughened glass film |
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| CN210773811U (en) * | 2019-12-16 | 2020-06-16 | 淮南铂众光电科技有限公司 | Tester for mobile phone toughened glass film |
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