This standard specifies the test method for the electrostatic half-life of plastic films charged by corona discharge under laboratory conditions. This standard applies to plastic films, and films made of other insulating materials can also be used as a reference. GB/T 14447-1993 Test method for electrostatic properties of plastic films Half-life method GB/T14447-1993 Standard download decompression password: www.bzxz.net
This standard specifies the test method for the electrostatic half-life of plastic films charged by corona discharge under laboratory conditions. This standard applies to plastic films, and films made of other insulating materials can also be used as a reference.

National Standard of the People's Republic of China
Test method for electrostatic properties of plastic films-Half-life method
1 Subject content and scope of application
GB/T 14447-93
This standard specifies the test method for the electrostatic half-life (abbreviated as "half-life") of plastic films charged by corona discharge under laboratory conditions.
This standard is applicable to plastic films, and films made of other insulating materials can also be used as a reference. 2 Reference standards
GB2918 Standard environment for testing state of plastic specimens and tests 3 Terms and symbols
3.1 Electrostatic voltage: voltage The pressure on the ground generated by the relatively stable charges accumulated on the surface of the test piece after being subjected to some external action is expressed in terms of. 3.2 Electrostatic strength 3.3 Electrostatic peak voltage electrostaticpeakvoftage The maximum electrostatic voltage generated by the sample after being subjected to some external action, expressed in. 3.4 Electrostatic peak electric field intensity elecirostaticpeakfieldintensity The maximum electrostatic field intensity generated by the sample after being subjected to some external action, expressed in. 3.5 Half-life hall-life
The time required for the peak value of the electrostatic voltage (or electrostatic field speed) of the sample to decay to -20% after the external action is removed, expressed in. 3.6 Residual electrostatic voltage residual elerirnstatic voltage The electrostatic voltage that exists as a function of time after the external action is removed. For example: Uu (after n00), (2u5 (after 2 000s) 3.7 Residual electrostatic field intensity rcsidual electrostatic fieldintensity The electrostatic field intensity that exists as a function of time after the external action is removed. For example: Etina(1 U00 s after), E2um2 000 s after) 4 Test principle
Under the standard test conditions, high voltage is applied to the discharge electrode to charge the sample in the form of corona discharge. When the high voltage is stopped, the sample is grounded and the white decays naturally. The half-life is tested to evaluate the charge leakage performance of the sample after charging. Approved by the State Administration of Technical Supervision on June 14, 1993 and implemented on December 1, 1993
5 Samples and preparation
GB/T 14447-93
5.1 The sample should be flat and clean. The sample should be taken with a clean hand or wearing clean gloves. Do not touch the surface of the sample to be tested with your fingers.
5.2 Cut 5 samples. If the surface static electricity of the front and back of the sample is different, they should be tested separately. At this time, take each sample:! 6. Standard environment for specimen conditioning and testing The specimen is conditioned in the standard environment with normal deviation specified in (B2918) for at least 24 hours. The surface of the specimen to be tested is exposed to this environment and the test is carried out in the same environment. 7. Test equipment
The test equipment is as shown in the figure below.
Schematic diagram of the test equipment
- High voltage generator, 2 discharge electrodes: 3- Test light, 1 electrostatic sensor; 5 electrometer: spring-time recorder
7.1 Full voltage generator
Provide -10kV voltage.
7.2 Discharge electrode
Used for trap discharge.
7.3 Sample fixture
The fixture is made of metal material. It should be able to clamp any sample flatly. 7.4 Electrostatic sensor
Can measure the electrostatic voltage (or electrostatic electric field strength) without contact. 7.5 Electrometer
Road voltage meter range 0~10kV or electrostatic field strength range 0~-200kV/m). Used to display the electrostatic voltage (or electrostatic electric field strength).
7.6 Electrostatic-time recorder
Used to record the relationship between electrostatic voltage (or electrostatic electric field strength) and time. 8 Test steps
8.1 Put the sample into the fixture: The sample after being prepared should be flat, without cracks or wrinkles. 8.2 Apply a high voltage of 10kV to the discharge electrode. When the sample reaches the electrostatic peak voltage (or electrostatic peak electric field strength E>10kV), stop applying the high voltage and record and measure the half-life of the sample. 8.3 Measure the residual electrostatic voltage (or residual electrostatic electric field strength) according to the actual requirements. 8.4 Each sample can only be measured once. 9 Value and expression of results Take the arithmetic average of the half-life of each sample as the test result, and report the maximum and minimum values. The half-life is expressed as ", and two significant figures are taken. 10 Test report The test report should include the following contents: National label: Name, type and production date of the sample; Effective size of the surface of the sample to be tested, in mm: Test device: Duration Ball: bzxz.net
According to the actual situation, the required electrostatic peak voltage (? (or electrostatic peak signal electric field strength E) and residual electrostatic voltage (or residual electrostatic electric field strength);
Actual state adjustment and test environment;
Test personnel and test period
Description of the situation that is inconsistent with this standard or the technical provisions of this standard. Additional remarks:
This standard was proposed by China Packaging Corporation and drafted by the National Packaging Product Quality Supervision and Inspection Center (Jinan) and Shandong Tengzhou Plastic Composite Color Printing Factory. The main drafters of this standard are Wei Yeguang, Zhou Changling, Zhang Chengzhi, Xu Lianshui and Jin Xingchun. This standard adopts DIN53486 "Test method for electrostatic properties of insulating materials 3.
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