This standard replaces GB/T8169-1987 "Test Method for Vibration Transmission Characteristics of Packaging Cushioning Materials". This standard specifies the test principle, test equipment, test samples, test procedures and test reports of the static compression test method for packaging cushioning materials. This standard is applicable to the evaluation of the cushioning performance of cushioning materials under static loads and their ability to protect the products contained in them during circulation. Compared with GB/T8169-1987, this standard has the following major changes: - Added references and terminology; - Modified the relevant requirements for the vibration table of the test equipment; - Modified the relevant requirements for the number of test samples; - Added regulations on the vertical position of the center of gravity of the fixture, test sample and mass block; - Clarified that the transmission rate during the test is the acceleration transmission rate; - Clarified the method of drawing the vibration transmission rate-frequency curve of the test output. GB/T 8169-2008 Test method for vibration transfer characteristics of cushioning materials for packaging GB/T8169-2008 Standard download decompression password: www.bzxz.net
This standard specifies the test principle, test equipment, test samples, test procedures and test reports of the static compression test method for cushioning materials for packaging. This standard is applicable to the evaluation of the cushioning performance of cushioning materials under static loads and their ability to protect the products contained in them during circulation.
This standard replaces GB/T8169-1987 "Test method for vibration transfer characteristics of cushioning materials for packaging".
Compared with GB/T8169-1987, the main changes of this standard are as follows:
--- Added the referenced documents and terms;
--- Modified the relevant requirements for the vibration table of the test equipment;
--- Modified the relevant requirements for the number of test samples;
--- Added the provisions for the vertical position of the center of gravity of the fixture, test sample and mass block;
--- Clarified that the transmissibility during the test is the acceleration transmissibility;
--- Clarified the method of drawing the vibration transmissibility-frequency curve of the test output.
Appendix A of this standard is an informative appendix.
This standard is proposed and managed by the National Packaging Standardization Technical Committee (SAC/TC49).
The drafting units of this standard are: China Machinery Productivity Promotion Center, Shenzhen Meiyingsen Environmental Protection Technology Co., Ltd., and China Export Commodity Packaging Research Institute.
The main drafters of this standard are: Huang Xue, Cai Shaoling, Li Jianhua, Zhang Xiaojian, Liu Ping.
The previous versions of the standards replaced by this standard are:
---GB/T8169-1987.
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study
B/T4122.1 Packaging terms Part 1: Basics
GB/T4857.2 Basic tests for packaging and transport packages Part 2: Temperature and humidity conditioning treatment (GB/T4857.2-2005, ISO2233:2000, MOD)

ICS55.040
National Standard of the People's Republic of China
GB/T8169—2008
Replaces GB/T8169--1987
Testing method of vibration transmissibilityfor packaging cushioning materials2008-06-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2009-01-01 Implementation
People's Republic of China
National Standard
Vibration Transmission Characteristics of Packaging Cushioning Materials
Test Method
GB/T8169--2008
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This standard replaces GB/T8169-1987 "Test method for vibration transfer characteristics of cushioning materials for packaging". Compared with GB/T8169-1987, the main changes of this standard are as follows: - Added reference documents and terminology; - Modified the relevant requirements for the vibration table of the test equipment; - Modified the relevant requirements for the number of test samples; - Added the provisions for the vertical position of the center of gravity of the fixture, test sample and mass block; - Clarified that the transmissibility during the test is the acceleration transmissibility; - Clarified the method of drawing the vibration transmissibility-frequency curve of the test output. Appendix A of this standard is an informative appendix.
This standard is proposed and managed by the National Packaging Standardization Technical Committee (SAC/TC49). GB/T8169-2008
The drafting units of this standard are: China Machinery Productivity Promotion Center, Shenzhen Meiyingsen Environmental Protection Technology Co., Ltd., and China Export Commodity Packaging Research Institute.
The main drafters of this standard are: Huang Xue, Cai Shaoling, Li Jianhua, Zhang Xiaojian, and Liu Ping. The previous versions of the standards replaced by this standard are: GB/T8169-1987.
1 Scope
Vibration transfer characteristics of cushioning materials for packaging
Test method
GB/T8169—2008
This standard specifies the test equipment, test samples, test procedures and test reports for the vibration transfer characteristics test of cushioning materials for packaging. This standard is applicable to the assessment of the vibration transfer (vibration isolation) characteristics of cushioning materials for packaging under sinusoidal vibration and the protection of the contents of the packaging.
This standard is applicable to cushioning materials with nonlinear elasticity. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB/T4122.1 Packaging terms Part 1: Basics GB/T4857.2 Packaging and transport Basic tests for packages Part 2: Temperature and humidity conditioning (GB/T4857.2-2005, ISO2233:2000 MOD)
3 Terms
The terms and definitions established in GB/T4122.1 and the following apply to this standard. 3.1
Acceleration transmission rate acceleration transmission rate The ratio of the acceleration of the mass block to the acceleration of the vibration table surface. 3.2
Vibration transmission rate-frequency curve vibration transmission rate-frequency curve A curve drawn with the vibration frequency of the vibration table surface during the test as the horizontal coordinate and the acceleration transmission rate formed during the test as the vertical coordinate.
4 Test Principle
This test consists of a vibration system consisting of a mass block, a cushioning material, a fixture and a vibration table to simulate the vibration absorption and transmission characteristics of the secondary impact material (hereinafter referred to as the test sample) of the package under the action of sinusoidal vibration. During the test, the acceleration values ​​of the mass block and the vibration table under the vibration state are recorded and expressed as a vibration transmissibility-frequency characteristic curve. 5 Test Equipment
5.1 Vibration Table
The vibration table should have a sufficiently large size, sufficient strength, rigidity and load-bearing capacity. The structure should ensure that the vibration table surface remains horizontal during vibration, and its lowest resonant frequency should be higher than the highest test frequency. The vibration table should be placed flat, and the maximum angle change from the horizontal is 0.3
5.2 Fixture
5.2.1 The fixture should have the rigidity and strength to ensure that the mass block vibrates vertically. For its structure, see Appendix A. The friction between the fixture and the mass block should not affect the vibration response of the mass block. 1
GB/T8169—2008
5.2.2 The surface of the cover plate of the fixing device should be flat and hard, and the area of ​​the upper and lower bottoms should be greater than 200mm×200mm, and it can apply a static pressure of 0.7kPa to the test sample on the upper part of the mass block. 5.3 Mass block
5.3.1 The mass block should be a rectangular structure with a flat surface, and the area of ​​the upper and lower bottoms should be greater than 200mm×200mm. Its mass can be adjusted. The mass block is made of hardwood or metal, and an inner cavity for installing the acceleration sensor should be provided at the geometric center of the mass block. 5.3.2 The mass block should have the rigidity and strength to ensure normal testing. The mass block should be selected as a whole block as much as possible. If multiple mass blocks are used, they should be tightened to avoid mutual magnetic collision between the mass blocks due to lack of fixation, thereby affecting the test effect. 5.4 Test systemwww.bzxz.net
The test system includes acceleration sensors, amplifiers, display or recording devices, etc. The test system should have sufficient frequency response. Within the measurement range, the accuracy of the test system should be within ±5%. 6 Test samples
6.1 Sampling
The test samples should be extracted from the finished products that have been placed for more than 24 hours. When their dimensions cannot meet the specified requirements, it is allowed to manufacture the test samples under the same conditions as the production conditions. 6.2 Size
The test sample is a regular rectangular shape, with the area of ​​the upper and lower bases being 200mm×200mm respectively. The thickness of the test sample is selected as required.
6.3 Quantity
The number of test samples is generally selected based on the accuracy required by the test results and the material of the test samples. The number of test samples in a group should be no less than 3.
6.4 Measurement
6.4.1 Length and width
Measure the dimensions of the two ends and the three positions in the middle along the length and width directions of the test sample respectively with a measuring tool with a minimum division of no more than 0.05mm, and calculate the average value respectively, and the accuracy is 0.1mm. 6.4.2 Thickness
Place a flat rigid plate on the upper surface of the test sample, so that the test sample is subjected to a compressive load of 0.20kPa ± 0.02kPa. After 30s, measure the thickness of the four corners under load with a measuring tool with a minimum graduation of no more than 0.05mm, calculate the average value, and be accurate to 0.1mm.
6.4.3 Density
a) Weigh the mass of the test sample with a balance with a sensitivity of more than 0.01g, and record the measured value; b) The density of the test sample is calculated as shown in formula (1). m
P=L×L×T
Where:
P—density of the test sample, in grams per cubic millimeter (g/mm); m is the mass of the test sample, in grams (g); L is the length of the test sample, in millimeters (mm); L—width of the test sample, in meters (mm); T is the thickness of the test sample, in millimeters (mm). 7 Test procedure
7.1 Pretreatment of test samples
Before the test, select a condition according to GB/T4857.2 to pretreat the test samples for more than 24 hours. 2
7.2 Temperature and humidity conditions during the test
GB/T8169-2008
The test should be carried out under the same temperature and humidity conditions as the pretreatment. If the same conditions cannot be achieved, it should be carried out under the same conditions as much as possible.
7.3 Test steps
7.3.1 Install the acceleration sensor in the mass block and the vibration table respectively. 7.3.2 Adjust the mass of the mass block to apply the required static pressure to the test sample. 7.3.3 Two test samples are placed on the upper and lower surfaces of the mass block respectively. 7.3.4 Press the cover of the fixture onto the test sample on the upper part of the mass block and reinforce it appropriately. Generally, the upper test sample should be subjected to a static pressure of 0.7 kPa. The vertical position of the center of gravity of the fixture, test sample and mass block should be as close as possible to the geometric center of the actual vibration table platform. During the test, the distortion of the test data caused by the separation of the mass block and the test sample should be avoided as much as possible. Note: For test samples with plasticity, appropriate measures can be taken to eliminate the influence of plastic deformation of the test samples on the test. 7.3.5 Carry out the frequency sweep test under the following conditions: a) Frequency range: Increase the frequency from 3Hz and pass through the resonance point of the system until the acceleration transmissibility is reduced to about 0.2;
one octave or 1 octave per minute; b) Frequency sweep rate: one per minute
c) Acceleration: 5m/s.
7.3.6 During the test, record the acceleration values ​​and corresponding vibration frequencies on the vibration table surface and the mass block. 7.3.7 Calculate the acceleration transmissibility.
7.3.8 Draw the vibration transmissibility-frequency curve with the acceleration transmissibility as the ordinate and the vibration frequency of the vibration table surface as the abscissa. 8 Test Report
The test report shall include the following contents:
Detailed description of the test sample, such as the name, type, shape, size, density, manufacturer, brand and date of manufacture of the material;a)
The number of test samples;
The vibration transmissibility-frequency curve, indicating the static pressure and thickness of the test sample; the pretreatment conditions of the test sample;
The temperature and humidity conditions during the test;
The mass of the mass block, in kilograms;
Relevant description of the test equipment;
Description of the differences between the test method used and this standard;i
Other detailed records and descriptions;
Test date, signature of the test personnel and seal of the testing unit. j
GB/T8169-2008
GB/T8169-2008
Appendix A
Informative Appendix)
Schematic diagram of the fixing device
Figure A.1 Schematic diagram of the fixing device
Fixing device
Test sample
Mass block
Test sample
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