1 range
Determination method of edge crush strength of corrugated board.
This standard is applicable to single corrugated (three layers) and double corrugated (five layers), three edges (layer seven) determination of corrugated cardboard marginal pressure strength.
2 reference standards
The provisions contained in the following standards are contained in the provisions of this standard by reference in this standard. When published in this standard, the versions shown are valid. All standards are subject to revision, and the parties to the use of this standard shall be subject to the use of the latest version of the following standards.
GB450-89 paper and paperboard samples taken
Standard atmospheres for handling and testing of GB10739-89 pulp, paper and board specimens
3 test principle
A rectangular corrugated board is arranged between the two pressure plates of the compression tester, and the corrugated direction of the test specimen is perpendicular to the two pressure plate of the compression test instrument, and then the pressure is applied to the sample until the sample is pressed. Determination of the maximum pressure of each specimen.
4 testing instruments
4.1 fixed clamp plate type electronic compression tester
The compression apparatus is operated by a fixed pressure plate and another direct rigid drive pressure plate, the moving speed of the moving plate is (12.5 + 2.5) mm/min. The size of the pressure plate shall be satisfied with the selected size of the sample, so that the test specimen shall not exceed the pressure plate, and the pressure plate shall also meet the following requirements:
The parallelism deviation of A. pressure plate is not more than 1:1000;
The lateral movement of B. does not exceed 0.05mm.
4.2 bending beam type compression apparatus
The compression instrument is based on the working principle of the beam bending, the requirement of the upper and lower plates is the same as that of the fixed clamp plate type electronic compression apparatus. When testing, the pressure of the moment of the collapse of the instrument may be measured in the range of deflection range of 20%-80%; when the pressure plate began to contact the sample, the pressure of the pressure plate should increase the speed (67 + 13) N/s.
The use of the instrument test should be indicated in the report, and shall not be used for testing.
4.3 sample cutting device
Can use a knife or saw, the mold used to prepare the sample, but must cut smooth, straight and perpendicular to the edge of the board surface.
4.4 guide block
Two pieces of polished smooth and deliberately shaped piece of metal, the section size of 20mm * 20MM length is less than 100mm; guide block to support the sample and make specimen perpendicular to the plate.
5 the sample is taken and processed.
5.1 samples are taken according to the provisions of GB450.
5.2 samples should be in accordance with the provisions of the GB10739 temperature and humidity treatment.
6 Preparation of test specimens
Section to take the direction of the rectangular corrugated rectangular sample, the size of (25 + 0.5) mm x (100 + 0.5) mm. There must be no indentation, printing marks and damage on the sample. Unless the parties agree, at least 10 samples are to be cut.
7 test procedure
Under the 5.2 conditions of the atmosphere for cutting and testing.
The sample is placed in the middle of the pressing plate, the short side of the sample is perpendicular to the two pressure plate, and the guide block is used to support the sample, so that the end face and the two pressure plate are perpendicular to each other, and the two guide block is parallel with each other and perpendicular to the surface of the sample.
Start the tester and put pressure on. When the pressure is close to 50N, remove the guide block until the specimen is crushed. Record the maximum pressure of the sample, accurate to 1N.
The remaining samples are tested at the above steps.
8 results indicated
The vertical edge compressive strength is calculated by the formula (1), which is expressed by N/:
R = 103/L * F
R - vertical edge compressive strength, N/m
F - maximum pressure, N;
L - the size of the long side of the sample, mm.
9 test report
Test reports include the following:
A. number of the national standard;
B. sample types and specifications;
Standard for C. testing;
Atmospheric conditions in the D. test site;
Type of test instrument and compression speed of e.;
The arithmetic mean of F. test results;
G. other information that helps to illustrate the results of the test.