Calculation method for compressive strength of corrugated boxes

3, carton compression strength cardboard edge pressure intensity calculation method

Corrugated cardboard edge pressure strength is equal to the sum of the lateral ring crush strength of the raw paper constituting each layer of the paperboard. For a hang paper, its crush pressure is the paper web crush strength multiplied by the corresponding corrugation elongation coefficient.

Single Corrugated Board Es=(L1+L2+rx F)

Double Corrugated Board Ed: (L1+L2+L3+r xF+rl X F1)

Three Corrugated Cardboard Et=(L1+L2+L3+L4+r XF+r1 X F1+r2 X F2)

In the formula

L1, L2, L3, and L4 are the ring pressure strengths (N/m) of corrugated cardboard, paper, and septum, respectively;

r, r1, r2 represent the corrugation elongation coefficient (see Table 2);

F, F1, and F2 indicate the ring pressure strength (N/m) of the core paper; adjustments are made.

Note: (1) Different tile equipment, even if it is the same type, due to the different size of the corrugating roller, there is a deviation in elongation coefficient, so the carton companies need to extend the use of the table according to the plant equipment conditions when using Table II to calculate The long coefficient is adjusted.

(2) The thickness of double-pit and triple-hole paperboard is simply added by the thickness of each single pit.

For example:

There is a K4A paperboard with a paper configuration of 230K/130F/160A. It is known that the lateral ring pressure strength of 230K is 2208N/m, the ring pressure of 130F is 516N/m, and the ring pressure of 160A is 1328N/m. .

answer:

Check the table to obtain a C extension coefficient r = 1.42

According to the formula ES = (L1 ten L2 ten rx F)
= (2208 + 1328 + 1.42 X 516)
= 4269 N/m

Comprehensive example

There is a color box whose pit type is BE pit; the size is 510 x 420 x 330CM; the paper for five-layer paper is configured to be 350 Huafeng whiteboard/112VISY pit paper/125 Liberation paper B paper/112 VINYY paper/175 papers A paper; flattened beer cut on both sides of the gong each hit a handle, known 350 Huafeng W ring pressure of 2900N / m, 112 VINYF paper ring pressure of 740N / m, 125 E paper B paper ring pressure of 1100N / m, 175, Liberation A pressure is 1420N/m; try to estimate the compressive value.

answer:

According to the box size, the perimeter is 1.86m. According to the pit type, the thickness of the board is 0,0045m. According to the pit type and the ring pressure of the base paper, the side pressure is 7425N/m.

Bring into the formula

P=5.874 X 7425N/m X 1.86 X 0,0045
=5,874 X7425N/m X 0.091m
=3969N

Since the two sides of the carton have a handle, the actual pressure resistance should be reduced by 20%, flat pressed beer cut, the pressure reduction by 5%, so the actual pressure resistance of the carton should be:

3969 X (1 - 25%) = 2977N

(to be continued)