HG/T 2724.5-1995 Test method for rubber threads and determination of adhesion between threads HG/T2724.5-1995 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG / T 2724. 5 -- 1995
idt IS02321: 1983
Test methods for rubber threads
Determination of adhesiveness between rubber threads and rubber threads Issued on 1995-06-30
Ministry of Chemical Industry of the People's Republic of China
Implementation on 1996-01-01
This standard is formulated by adopting the thirteenth part of the international standard ISO2321: 1983 "Rubber threads - Test methods" and is equivalent to it in terms of technical content and writing rules. By adopting the international standard, the test method suitable for rubber threads in my country is formulated, laying a foundation for the formulation of product standards in the future and adapting to the needs of international trade technology and economic exchanges as soon as possible. Easy,
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Latex Industry Research Institute of the Ministry of Chemical Industry. The drafting unit of this standard is the Latex Industry Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Xia Yingyuan, Wen Huanzheng, Kang Ronghua 33
ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standards associations (ISO member bodies). The work of formulating international standards is carried out through ISO technical committees: any member body interested in the project established by the technical committee has the right to participate in the committee, and any governmental and non-governmental international organization that has relations with ISO can participate in this work. The draft international standards adopted by the technical committees should be sent to the member bodies for approval before they can be approved as international standards by the ISO Council
International Standard ISO 2321 was prepared by ISO/TC45\Rubber and Rubber Products\Technical Committee. This second edition was submitted directly to the ISO Council in accordance with Section 6.11.2 of Part 1 of ISO Technical Work Guidelines. The second edition replaces the first edition (i.e. ISO 2321:1975) and is approved by the following national member bodies. Belgium
Bulgaria
CanadabzxZ.net
Czechoslovakia
Federal Republic of Germany
Ireland
Israel
Italy
The following members have expressed disapproval of this document for technical reasons: United States
Portugal
Romania
This International Standard also replaces Annex 1-1975. Annex 2-1980 and Annex 3-1980.34
1 Scope
Chemical Industry Standard of the People's Republic of China
Test methods for rubber threads
Determination of adhesion between threads and adhesive tape HG/T 2724. 5 — 1995
idt ISO 2321: 1983
This standard specifies the test methods for the adhesiveness of rubber threads and rubber threads to measure the performance of rubber threads in actual use. This standard is applicable to rubber threads made of natural rubber latex. 2 Referenced standards
The following standards contain provisions that are referenced in this standard and constitute the provisions of this standard. When the standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB2941-91 Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens (cqVTSO47I: 1983, eqv ISO 1826: 1981)
3 Principle
At one end of the rubber wire, all rubber wires are separated by a short distance, and then alternately divided into two groups of spare rubber wires to determine the minimum force required to separate the two groups of rubber wires to a specified length under a specified extension. In order to show that the result is independent of the number of rubber wires, the adhesion is usually expressed by the length of the tested rubber wire, and its weight is equal to the force required to measure the separation of the rubber wires.
4 Apparatus
4.1 Tensile test machine: The constant moving speed is 5.0±0.3mm/s, and there is a semi-straight fixture so that each rubber wire is arranged in parallel. The range of 0~5N can usually meet the requirements. It is recommended to use stress-strain recording paper during the test. 4.2 A simple device can also be used: This device uses a steel plate or other plate. The steel plate should be straight, with a hole drilled at one end. A small steel plate is fixed on it with a screw as a fixture. One of the two sets of rubber threads can be clamped on this fixture, and the other set of rubber threads is freely connected to the plate. The plate can be a small paper box (weighed before the test), which can be placed inside. 5 Test specimens
Each test specimen is a whole section of about 500mm long with rubber threads. 6 Test steps
6.1 Park the specimen according to the provisions of GB2941.
6.2 Separate all ends with rubber threads by about 50mm in length. 6.2.1 When using the device specified in 4.1, combine all the rubber threads in odd positions and all the rubber threads in even positions together, and place the rubber threads on the shielding tape in order to divide them into two groups, keeping the rubber threads arranged in rows. Adjust the clamps on the testing machine so that they are separated by about 75 mm. Approved by the Ministry of Chemical Industry of the People's Republic of China on June 30, 1995 and implemented on January 1, 1996
HG / T 2724. 3 -- 1995
Install one set of rubber threads on the upper clamp and the other set of rubber threads on the lower clamp. Make sure that the rubber threads are arranged in parallel and the outlet end with rubber threads should be supported horizontally during the whole test. Start the machine and record the time it takes to separate the rubber threads for more than [00 mm test length, 62.2 When using the simple device specified in 4.2, combine all the odd-numbered and even-numbered rubber threads together and tie knots at the free ends. One group is clamped on the upper fixture and the other group is freely connected to the plate. A force is applied by adding a base weight of known mass to the plate until the straight rubber thread can slowly shrink and separate by at least 50 mm.
6.3 During the test, pay attention to whether the front end of the entire rubber thread separates in a sufficiently uniform manner. Uneven hooking indicates different degrees of adhesion to different rubber threads.
7Results show
The adhesion of the rubber thread is expressed in meters according to the length of the rubber thread separated from the tape, and its weight is equal to the average separation force measured. When a part of the rubber thread (for example, 10 rubber threads) is taken out from the whole tape for testing, considering the different ratios between the number of rubber threads and the number of adhesive lines in the two cases, the measured adhesion should be multiplied by a correction factor in order to compare it with the adhesion of the whole tape. This ratio is calculated as follows:
(N-1)n
[ (n-)N
Wherein: N—the number of rubber threads in the entire tape; N-1—the number of rubber threads in the tape in the test part; N-1—the number of rubber threads in the tape in the test part; N-2—the number of adhesive lines in the tape in the test part. 8 Test report
The test report should include the following contents:
Mark of the tape;
Adhesion: meter;
Whether the separation is uniform or uneven;
Test period;
Tester.
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