Corrugated box anti-pressure resistance formula case analysis II (2)

Example 2: The circumference of a five-story BC carton is 178em, the paper in the facial paper is 200g/m2A, and the horizontal ring pressure is 255N/0.152m. The two-layer paper is 150g/m2A high-strength corrugated paper. The ring pressure is 182N/0.152m; the core is 200g/m2 paperboard, the lateral pressure is 240N/0.152m, and the compressive strength of this carton can be calculated.

solution:

R1=R2=255N/0.152m
R3=240N/0.152m
Rm1=Bm2=182N/0.152m
Cb=1.477, Cc=1.361, Z=178cm

Bring the above data to the formula,

P=Px K=(R1+R2+R3+Rm1C1+Rm2C2)/15.2X(35.7 to 0.325Z to 0.0005Z2)
= (255+255+240+182X1.361+182X1.477)/15.2X (35.7 to 0.325X178 to 0.0005X1782)
=83.2 X77.7
=6464 N

That is, the five-layer carton can achieve a compressive strength of 6464N

Example 3: The perimeter of a three-layer A cardboard box is 148cm, the compressive strength is required to be 4500N, and the surface paper is selected from the class B boxboard 250g/m2.
The A grade high strength corrugated paper is used for crepe paper to calculate the amount of crepe paper that should be used.

Solution: The ring pressure index of the paper in the tissue paper is 9.2, and the quantitative W of the crepe paper is unknown. The A shrinkage ratio C=1.532, Z=148 cm,
P=4500N

R1=R2=250X9.2X0.152=350N (R1+R2+R3XC)/15.2X (30.3 to 0.275Z to 0.0005Z2)=P (350 to 350 to R3X1.532)/15.2X (30.3+0.275X148—0.0005X1482)=4500
R3=287
R3=WX9.2 X0.152=287
W=205g/m2

The carton crepe should use 205g/m2 A-grade high-strength corrugated paper.

After the analysis of the antagonistic formula, we can conclude that the larger the carton is, the greater the compressive strength that can be endured when the material and the carp type are the same; the smaller the carton, the greater the pressure strength that can withstand the unit length. Big. In the case of the same material and type, the increase in the perimeter of the carton and the increase in compressive strength will form a changing curve, that is, due to the increase in the circumference of the carton, the instability of the carton will increase. According to the formula, after the carton perimeter reaches a certain stage, the compressive strength it can withstand will show a declining proportion. Therefore, we have a suitable range when designing the compressive strength of cartons. The changes in the perimeter and compressive strength of the carton are shown in the figure:

(Baoding Yuejin Carton Co., Ltd. Anti Yingjie)