Ring pressure strength test method

Ring Crush Strength Test ( GB/T2679.8-1995 - "Paperboard Ring Pressure Strength Test Method")

Cardboard ring compression strength refers to the maximum force that can be taken before a sample is crushed by inserting a sample of a certain size into the sample holder to form a circular ring and applying pressure between the upper and lower pressure plates. The ring pressure strength characterizes the ability of the cardboard edge to withstand pressure and is an important strength indicator for cardboard and corrugated paper. The paperboard ring pressure strength affects the side pressure strength of the corrugated board, and the side pressure strength of the corrugated board will have an important influence on the overall compressive strength of the carton.

A certain size of sample is inserted into the circular tray to form a circular ring on the side of the sample, and then the compression of the compressor is performed on the pressure plate for uniform compression. When the sample is crushed, the displayed value is the ring pressure. strength. The standard sample specification should be: length ( longitudinal ) 152mm ± 0.2mm , width 12 . 7mm ± 0.1mm , take 10 pieces for inspection, 5 pieces face to the front to detect, and the other 5 pieces face to the outside to load into the circular tray to detect separately. Then, take the result of the 10 pieces of detection to find an average value. Used for conversion. In order to improve the accuracy of the test, care should be taken to carefully test the quantitative indicators because the quantitative detection of the numerical values ​​has a direct influence on the results of the conversion of the cir- culation index. Therefore, quantitative test samples should have a certain representative, it is best to take 10 samples from different parts of the paper tube for testing, find the average value, so that the test is relatively accurate. If 10 samples are taken from a longitudinal part of the paper cylinder, the detection value is often not representative, because the lateral thickness error of the paper tube is relatively larger than the longitudinal error. In addition, the accuracy of the test specimen thickness is also related to the test results of the crush strength. Because of the different thicknesses of the specimens, the diameter of the core used for detecting the ring pressure is also different. Therefore, the thickness test should also be used to test several points in different parts, find the average value, as the final test results. The thickness index is accurately detected, and the gap between the sample placed in the tray is appropriate, which can ensure the accuracy of the ring pressure strength detection. This requires that the appropriate tray size ( diameter ) must be selected in strict accordance with the thickness of the sample. The tightness and quantification of the base paper greatly affect its crush strength. For a paper with good crush pressure, the ring pressure index is also correspondingly high; only by first measuring the ring crush strength value, can we obtain the cir- culation index value. The following is the formula for the conversion of the cir- culum pressure and the ring crush index:

    1 Ring crush strength: R=F / 152 . Where: R is the ring pressure strength in kN / m ; F is the force reading force when the sample is crushed, unit N ; 152 is the length of the sample in mm .

    2 Central pressure index: Rd=1000R / W . In the formula: Rd represents the ring pressure index, unit N • m / g ; R represents the ring pressure strength, unit KN / m : W is the quantification of the sample, unit g / m2 .

The testing equipment is: HD-513-2 Microcomputer Compression Tester,

The testing equipment is: HD-522 ring pressure test center plate,

The testing equipment is: HD-518 ring pressure sampler

The main technical parameters:

Capacity: 10,20,50,100,200kg ( optional ) ;

Decomposition degree: 1/100,000 ;

Accuracy: ≤ 0.5%

Display mode: LCD display

Pressure plate: 100 × 100mm or visual pressure depending on the sample diameter;

Compression spacing: 80mm ;

Platen parallelism: ± 0.05mm

Ring pressure test specimen: 152.4 × 12.7mm

Pressure test specimen: 25 × 100mm

Test speed: 12.7mm/min

Horsepower: 1/8HP ;

Dimensions: (L × W × H) 570 × 415 × 730mm

Professional create value, Dongguan Haida cast quality! Dongguan Haida equipment specializing in the production of carton compression testing machine , burst strength testing machine, drop test bench , vibration testing machine and other packaging testing equipment, welcome to call!

For more detailed product series and related technical parameters, please contact:

National Unified Service Hotline: 400-0711-808

Haida International Instrument: 0769-89280808

company website:

Source: Dongguan Haida International Instruments    Reproduced without permission! (Or: if you need to reprint, indicate the source)