This standard specifies the test method for the determination of the tear extension force at the fold of thermoplastic soft film bags under given conditions. This standard is applicable to the detection of the residual strength at the fold of thermoplastic soft film. GB/T 20860-2007 Test method for tear extension at the fold of thermoplastic soft film bags for packaging GB/T20860-2007 Standard download decompression password: www.bzxz.net
This standard specifies the test method for the determination of the tear extension force at the fold of thermoplastic soft film bags under given conditions. This standard is applicable to the detection of the residual strength at the fold of thermoplastic soft film.

ICS55.020
National Standard of the People's Republic of China
GB/T20860—2007/ISO11897:1999 Packaging
Thermoplastic flexible film bags
Test method for tear propagation on edge folds
PackagingSacks made from thermoplastic flexible film-Tear propagation on edge folds(ISO11897.1999,IDT)
Published on March 21, 2007
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on September 1, 2007
GB/T20860—2007/IS011897:1999 This standard is equivalent to the international standard ISO11897:1999 "Packaging thermoplastic flexible film bags
Test method".
Appendix A of this standard is an informative appendix.
Tear propagation test at folded edge
This standard was proposed by the National Technical Committee for Packaging Standardization and is under the jurisdiction of the Glass Container Sub-Technical Committee of the National Technical Committee for Packaging Standardization.
The drafting units of this standard are: National Packaging Product Quality Supervision and Inspection Center (Tianjin), National Packaging Product Quality Supervision and Inspection Center (Guangzhou).
The main drafters of this standard are: Li Hua, Liu Bo, Zhu Liping, Feng Yong, Shao You, Wang Zhenhua, Wang Qing, Zhang Weihong. 1
GB/T20860—2007/ISO11897:1999ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation composed of national standardization bodies (ISO members). The formulation of international standards is usually completed by ISO technical committees. Any member interested in a project established by a technical committee has the right to send representatives to participate in the technical committee. Whether it is an official or unofficial international organization, as long as it has a connection with ISO, it can also participate in the work. ISO works closely with the International Electrotechnical Commission (IEC) in the field of electrotechnical standardization. International standards are drafted in accordance with the requirements of Part 3 of the ISO/IEC Directives. The draft international standards approved by the technical committee are sent to the members for voting. International standards need to be approved by at least 75% of the member groups participating in the voting before they can be officially published. International standard ISO11897 was developed by ISO/TC122 Packaging Technical Committee SC2 Packaging Bags Sub-Technical Committee. Appendix A is for reference only
1 Scope
GB/T20860—2007/IS011897:1999 Packaging Thermoplastic Soft Film Bags
Test method for tear extension at folded edge
This standard specifies the test method for tear extension force at folded edge of thermoplastic soft film bags under given conditions. This standard is applicable to the detection of residual strength at the folded edge of thermoplastic soft film. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB/T1040.3 Determination of tensile properties of plastics Part 3: Test conditions for films and sheets GB/T4857.2 Basic tests for packaging and transport packages Part 2: Temperature and humidity conditioning (ISO2233: 2000, MOD) GB/T6672 Determination of thickness of plastic films and sheets Mechanical measurement method (idtISO4593: 1993) 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Resistance to tear propagation The force of a trapezoidal specimen with a notch and a perforation to resist tear propagation. 3.2
Residual resistance
The ratio of the tear extension force at the folded edge of the film to the tear extension force at the non-folded edge, expressed as a percentage. Test sample
4.1 Sampling and preparation of test samples
The specimens are taken from the film or plastic bag to be tested as shown in Figure 1. The folded edge specimens should include the folded edge, and the incision should coincide with the folded edge. The non-folded edge specimens should be directly along the folded edge and cut on both sides of the sample bag, with the incision parallel to the folded edge. Cut the specimens with a knife or punch, and the edges should be smooth and free of burrs. It is recommended to use the template shown in Appendix A to cut and mark the specimens. Use ink or other neutral media that does not affect the properties of the material to mark the specimens, as shown in Figure 1. GB/T20860—2007/ISO11897:19991 Folded edge:
Clamp holding markings:
3——perforation markings;
perforation,
5——incision.
Note: The transverse markings at the inner end of the incision facilitate the positioning of the specimen perforation. 137
Figure 1 Specimen for hem tear propagation test 4.2 Number of test specimens
If possible, take five hem specimens and five non-hem specimens. 5 Test equipment
5.1 Tensile testing machine
Unit: mm
According to the provisions of GB/T1040.3, the clamp should be able to clamp the specimen according to the markings, and the clamp width is 100mm. 5.2 Thickness tester
The thickness tester should comply with the provisions of GB/T6672. 6 Test environmental conditions
The test was carried out under the conditions specified in GB/T4857.2 at 23°C ± 2°C and relative humidity of 50% ± 2%. 7 Test procedure
7.1 Pre-treat the specimen for 24 hours as specified in Chapter 6. 7.2 Measure the thickness of the specimen in accordance with the method specified in GB/T6672. The measuring points should be on both sides of the folded edge, close to the incision. 7.3 Fix the specimen on the upper and lower fixtures of the tensile testing machine. The markings on the specimen should coincide with the edges of the fixtures as much as possible. Start the tensile test and perform the tensile test at a speed of 100mm/min ± 10mm/min. Observe and record the maximum value obtained. 8 Evaluation
Calculate the arithmetic mean using the maximum force value of each test. The test results of the folded film and the unfolded film should be calculated separately. Calculate the residual strength as the ratio of the two average values ​​[see formula (1)]. 2
Wherein:
R——residual strength, %
R=Frala/FilnX100%
Tear extension force at the folded edge of the film, in Newton (N), Ffeld
Tear extension force at the non-folded edge of the film, in Newton (N). 9 Test report
The test report shall include the following contents:www.bzxz.net
Statement that the test is carried out in accordance with this standard;
Natural state and markings of the tested tubular film or plastic bag; Production date of the tubular film or plastic bag; Number of specimens;
Specimen pretreatment time and laboratory environmental conditions; Specimen thickness;
Tear propagation force value of the specimen at the folded edge,
Tear propagation force value of the specimen at the non-folded edge; Residual strength:
GB/T20860-—2007/IS011897:1999 (1)
Any abnormal phenomenon during the specimen testing, such as any difference from this standard in the tear propagation and rupture mode;
Test date.
GB/T20860-2007/ISO11897:1999 Appendix A
(Informative Appendix)
Sample Preparation Template
Figure A.12mm~3mm Thick Copper Sample Preparation Template
GB/T20860-2007
Unit: mm
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Book Number: 155066-1-29733
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