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GB/T 31726-2015: Test method for anti-fogging property of plastic film
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Test method for anti-fogging property of plastic film
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GB/T 31726-2015
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Basic data | Standard ID | GB/T 31726-2015 (GB/T31726-2015) | | Description (Translated English) | Test method for anti-fogging property of plastic film | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G33 | | Classification of International Standard | 83.140.10 | | Word Count Estimation | 8,885 | | Date of Issue | 2015-06-02 | | Date of Implementation | 2016-01-01 | | Quoted Standard | GB/T 2918-1998; GB/T 6682-2008; GB 11533-2011 | | Regulation (derived from) | National Standard Announcement 2015 No.19 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies the three measurement methods for plastic film anti-fog properties, namely: cold fog method, rapid thermal fog method and hot water bath method fog. This Standard applies to the transparent plastic film (film) Determination of anti-fog. In general, the situation in this standard fog Act applies to below the dew point of packaging, rapid thermal fog hot water bath method and fog law applies to the dew point above the packing. | GB/T 31726-2015: Test method for anti-fogging property of plastic film---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method for anti-fogging property of plastic film
ICS 83.140.10
G33
National Standards of People's Republic of China
Test method for anti-fog property of plastic film
2015-06-02 release
2016-01-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by China National Standardization Administration
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products (SAC/TC48).
This standard is drafted by. Jiangsu Zhongda New Materials Group Co., Ltd., Guangdong Deguan Film New Materials Co., Ltd.,
Jiangyin Product Quality Supervision and Inspection Institute, Shanghai Tobacco (Group) Company, Jiangyin Jingliang Plastic Co., Ltd., Foshan Fosu Technology Group Co., Ltd. have
Limited company.
The main drafters of this standard. Wang Mingzhen, Xu Wenshu, Xu Liang, Cao Changqing, Sheng Chenglin, Liang Meiying, Wu Xiangqin, Zheng Zhentao.
Test method for anti-fog property of plastic film
1 Scope
This standard specifies three methods for measuring the anti-fog properties of plastic films, namely. cold fog method, rapid hot fog method and water bath hot fog method.
This standard applies to the determination of the anti-fog properties of transparent plastic films (sheets).
Generally speaking, the cold mist method stipulated in this standard is applicable to packaging below dew point, and the rapid hot mist method and water bath hot mist method are applicable to dew point
The above packaging situation.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 2918-1998 Standard environment for plastic sample condition adjustment and testing
GB/T 6682-2008 Analytical laboratory water specifications and test methods
GB 11533-2011 standard logarithmic vision chart
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Anti-foggingproperty
The plastic film has the property of improving or preventing the formation of water droplets or water mist in the enclosed space.
4 Test equipment
The test instruments are as follows.
a) Flat beaker. capacity 250mL, outer diameter (70 ± 2) mm, full height (95 ± 2) mm;
b) Stopwatch. accuracy is not less than 1s;
c) Low temperature thermostat or refrigerator. constant temperature range. 0 ℃ ~ 10 ℃, temperature control accuracy is not less than 1 ℃;
d) Constant temperature water tank. constant temperature range. room temperature ~ 80 ℃, temperature control accuracy is not less than 1 ℃;
e) Thermometer. it can measure 23 ℃, 85 ℃, and the division is 0.1 ℃.
5 Sample
5.1 Sampling
The sample should be evenly sampled along the entire width to avoid appearance defects such as wrinkles and impurities on the surface that affect the test results.
5.2 Dimensions and sample preparation
5.2.1 Flat sheet. The size is (120 ± 3) mm × (120 ± 3) mm, enough to cover the beaker mouth.
5.2.2 Square bag. Take a film with a size of (300 ± 2) mm × (160 ± 2) mm as shown in Figure 1, with the test surface facing inward along the center
The line is folded in half, and the two sealed sides are combined into a square bag with a sealing width of 5mm ~ 15mm. Make a positioning mark at (70 ± 2) mm from the opening edge of the sample
Remember to put on the beaker mouth so that the positioning mark coincides with the beaker mouth, as shown in Figure 2.
5.2.3 A group of tests should use samples of the same shape and size.
Explanation.
L1 --- opening edge, the size is (160 ± 2) mm;
L2 --- sealing edge, the size is (300 ± 2) mm;
L3 --- The distance between the positioning mark and the opening edge is (70 ± 2) mm.
Figure 1 Preparation of the sample before sealing the square bag
The unit is mm
Explanation.
1 --- Square bag sample;
2 --- Locating mark;
3 --- Double-sided tape or rubber band;
4 --- Water level line;
5 --- Beaker.
Figure 2 Beakers with square bag samples
5.3 Number of samples
Each group of tests was conducted 3 times. If the results of 3 tests were inconsistent, 2 additional tests were conducted. If a group of trials appears 3 and so on
Grade, need to retest.
5.4 Standard environment for sample condition adjustment and test
Unless otherwise specified, the sample should be in accordance with the provisions of GB/T 2918-1998, in an environment of temperature (23 ± 2) ℃ and relative humidity (50 ± 10)%
Under the state, the state adjustment time is not less than 4h, and the test is carried out in this environment.
6 Test methods and procedures
6.1 Cold fog method
6.1.1 Inject (200 ± 10) mL, (23 ± 2) ℃ tertiary water that meets the requirements of GB/T 6682-2008 into a flat-mouth beaker.
6.1.2 Fix the sample with double-sided tape or rubber band so that the anti-fog test face is buckled on the mouth of the beaker, and the test site should be flat.
6.1.3 Place the flat beaker with the fixed sample in a low temperature incubator or refrigerator with a temperature of (3 ± 2) ° C and start timing.
6.1.4 At 5 minutes, take out the beaker with the sample and place it on the standard logarithmic near vision chart in Appendix B of GB 11533-2011 to burn
The bottom center of the cup is aligned with the 0.1 center line of the eye chart. Under natural light or a 40W fluorescent lamp, observe the film from top to bottom perpendicular to the bottom of the beaker
Observe the surface of the sample within 5s.
6.2 Rapid Hot Mist Method
6.2.1 Place the flat beaker on the standard logarithmic near vision chart in Appendix B of GB 11533-2011, align the bottom center of the beaker
In the 0.1 center line of the eye chart, inject (200 ± 10) mL, (85 ± 2) ℃ in line with GB/T 6682-2008 requirements of tertiary water.
6.2.2 Quickly fix the sample with double-sided tape or rubber band so that the anti-fog performance test face is buckled on the mouth of the beaker, and the test site should be flat. this
The time is started and the test time is 60s.
6.2.3 Complete the fixation of the samples in 6.2.1 and 6.2.2, the total time shall not exceed 20s.
6.2.4 At 60s, under natural light or 40W fluorescent lamp, observe the surface of the film sample from top to bottom perpendicular to the bottom of the beaker, observe within 5s
Finished.
6.3 Water bath hot mist method
6.3.1 Add tap water to the sink and fix the standard logarithmic near vision chart in GB 11533-2011 Appendix B after waterproofing and fix the water bath
On the bottom plate of the trough, the clarity of the visual acuity chart visible in the water is consistent with the natural state.
6.3.2 Pour (200 ± 10) mL, (23 ± 2) ℃ into the flat mouth beaker to meet the requirements of GB/T 6682-2008 tertiary water.
6.3.3 Fix the sample with double-sided tape or rubber band so that the anti-fog performance test surface is buckled on the beaker mouth, and the test site should be flat.
6.3.4 Place the flat beaker with the sample in a constant temperature water tank at (60 ± 2) ° C, so that the bottom of the cup is submerged in the water bath (50 ± 5) mm, start
Timing.
6.3.5 At 15min, under natural light or 40W fluorescent lamp, observe the film sample surface from top to bottom perpendicular to the bottom of the beaker, observe within 5s
Finished.
7 Results
7.1 Report the test grade. The basis for the determination of the test grade is shown in Table 1.
Table 1 Comparison table of anti-fog levels
Refer to pictures for grade determination
Completely transparent, without water droplets. The clarity of the eye chart and
Before the test
The transparency is good, with a small amount of uneven large water droplets.
The clarity of the eye chart of more than 50% area is the same as before the test
Exactly
Basically transparent, with more water droplets. Eye chart font
Deformation
Translucent, with many small drops of water. 0.1 of the eye chart
The next few are visible
5 Completely opaque and completely invisible
7.2 The test results are characterized by the most frequent level in the total number of tests.
8 Test report
The test report shall include the following items.
a) The name and number of this standard;
b) Description of test materials;
c) The temperature, humidity and time of the sample condition adjustment;
d) Sample type;
e) Test method;
f) Anti-fog level;
g) The number of tests;
h) Test personnel and date;
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