Calculation method of edge pressure / ring pressure / vertical pressure strength of paper and paperboard

Calculation method of edge pressure / ring pressure / vertical pressure strength of paper and paperboard A vertical edge compressive strength is calculated according to the calculation method, expressed in N / m as f × 103 r = Formula (1) l: R - vertical edge compressive strength n / M; F - Zui force value, N; L - dimension of long side of pattern, mm B Calculation method of ring compression strength (average value of longitudinal and transverse forces calculated separately): FR = Formula (2) 152: r-ring compression strength, kn / M; F - The force value read when the sample is crushed, N; 152 - length of the sample, m m report the average ring compression strength R, to 0.01kn/m If necessary, calculate the ring compression strength index according to formula (3), to 0.1N? M / g 1000r Rd =..... in formula (3) W, RD - Ring pressure strength index, n? M / g; R - ring pressure strength: kn / M W - quantitative, g / ㎡ C Method for determination of vertical compressive strength f r =..... formula（ 4) In the formula 150, R is the strength of firm pressure, kn / M; F is the force value read when the sample is pressed, N; 150 is the length of the sample, mm is the average pressure strength R, 0.01kn/m