Spulance Cotton Roll,Surgical Spulance Cotton Roll,Consumables Spulance Cotton Roll,Spulance Cotton Roll For Medical COTTONWHISPER (TAIZHOU) DAILY PRODUCTS CO.,LTD , https://www.zjcosmeticpuff.com
Cardboard ring pressure strength refers to a certain size of the sample, inserted in the sample seat to form a ring shape, pressure between the upper and lower pressure plate, the maximum force that the sample can bear before being crushed. The ring pressure strength characterizes the performance of the pressure on the edge of the cardboard, and is the strength index of the closure of the cardboard and corrugated paper.
Cardboard ring pressure strength affects the side pressure strength of corrugated board, and the side pressure strength of corrugated board will affect the compressive strength of the carton group. A certain size of sample is inserted into a circular tray, so that the side of the sample is formed into a ring shape, and then the pressure plate of the compression apparatus is placed in an electric uniform compression manner. When the sample is crushed, the number revealed is a ring. Pressure strength. The standard sample specification should be: length (longitudinal) 152mm ± 0.2mm, width 12.7mm ± 0.1mm, take 10 pieces of test and determination, where 5 pieces are tested outwards and outwards, and the other 5 pieces are loaded in a circle toward the outside. In the ring tray, other tests are performed. After this, the final results of the 10 test determinations are used to obtain a uniform value for conversion.
In order to increase the degree of accuracy of the test, care should be taken to treat the test quantitatively. Because of the volume of the quantitative test, there is a direct impact on the final result of the conversion of the CPI. Therefore, quantitative test and determination of the sample should have a certain representative, it is best to take 10 samples from the lateral position of the paper tube for testing and determination, and find the uniform value, so the test is relatively correct. If the 10 samples are taken from a longitudinal part of the paper tube, the test measurement number is often lack of representativeness, because the lateral thickness error of the paper tube is relatively larger than the longitudinal error.
In addition to this, the correctness of the sample thickness test is also related to the final result of the test of the crush strength. Because the thickness of the sample is not the same, the diameter of the tray core used for the test to determine the strength of the ring pressure is not the same. Therefore, the thickness inspection test should be considered as suitable and use several points of the test different parts, find the uniform value, as the final inspection to see the final result. The thickness index test is correct and the gap between the sample in the tray is more appropriate, which can better guarantee the correctness of the ring pressure strength test. This requires that the appropriate tray size (diameter) be selected according to the thickness of the sample.
How tightness and quantification of the base paper affect its crush strength to a large extent. The paper with good ring crush strength has a higher ring pressure index. Only when the ring crush strength is measured first, the capacity can be obtained for the ring pressure index number. The following is the formula for the conversion of the ring crush strength and the ring pressure index:
1 Ring crush strength: R=F/152. In the formula: R expresses the ring pressure intensity, the unit kN/m; F is the force value that the sample reads when crushing, unit N; 152 is the length of the sample, unit mm.
2 Central pressure index: Rd=1000R/W. Where: Rd expresses the ring pressure index in units of N·m/g; R expresses the ring pressure strength in units of KN/m: W is the quantification of the sample in g/m2.
Analysis of Calibration Method for Paperboard Ring Pressure
- "Cardboard ring pressure strength calibration method")