Corrugated board materials matching principle analysis of three

Sixth, corrugated board puncture strength (J)

Puncture strength is the amount of work required to pierce a paperboard with a particular shape of a pyramid under certain experimental conditions, ie, the energy required to puncture, stretch, tear, and bend the hole.

Puncture strength reflects the ability of corrugated board to resist external force damage, and is not the same as the static performance of burst resistance. The puncture strength expresses the dynamic strength of corrugated cardboard, which is close to the actual stress of the carton during transportation and loading and unloading. Check the puncture strength of corrugated cardboard.

The test method of puncture strength is to take four 175x175nun samples from each sample box of three sample boxes and puncture the test blocks totaling 12 pieces, and take the samples vertically and horizontally. Place the opposite side horizontally on the middle of the splint with the fixing force (250N-1000N) with the through hole, select and test the appropriate measurement range, adjust the zero position, set the pointer to the highest scale value, and then start the release device to make the pendulum The arm pushes the pyramid to penetrate the sample, reads the measured value, and calculates the arithmetic average of the test results.

Seventh, corrugated carton compressive strength

The compressive strength of corrugated boxes is only applicable to the detection of closed corrugated boxes. It is used as a complete package. At present, there are many corrugated boxes packed in bottom trays. The corrugated boxes are only part of the box, that is, the bottom of corrugated boxes is Open-type, this type of packaging in the pressure is mainly built-in products and liners to support the role, does not require the corrugated cardboard box compressive strength, if blindly stressed corrugated box compressive strength, on the one hand can not guarantee the measured compressive strength Strength stability, but also caused a waste of costs. The compressive strength of corrugated boxes should be particularly suitable for soft packaging corrugated cartons of dairy products.

The compressive strength of corrugated boxes is the maximum pressure value that the box can withstand when it is placed three-dimensionally in a three-dimensional corrugated box. The test method of compressive strength test is to stereoscopically fit three kinds of sample boxes, seal them with sealing tape, and place the middle position of the lower press plate of the compression tester, and then start the upper press plate close to the empty box, and then The standard speed of pressurization is started until the carton is crushed. Reading the measured value is the compressive strength. The smaller the deviation between each test data is, the more stable the compression resistance of the carton is.

The compressive test process is divided into four stages: the first is the preloading stage to ensure that the corrugated box is in contact with the platen of the compression tester; the second is that the transverse pressure line is pressed down and the load is slightly increased. Will be very large; third is the corrugated box side pressure stage, when the load increases rapidly, the increase in the amount of slow; the fourth is the corrugated box when the corrugated box is completely destroyed.

Corrugated box compressive strength is divided into effective and final values, in the compressive test, the force value sometimes have a certain buffer, both when the force value and deformation increase to a certain stage, the force value to stop deformation Continue to increase, after a period of time, the force value continues to increase until the collapse of the carton, the force value before the buffer is an effective value, the amount of deformation before the buffer is the effective deformation, after buffering, although the force value continues to increase, but the carton At the beginning of the deformation, the requirements for the use of the carton itself have not been reached. Under normal circumstances, the deformation of single-wall B-Watt before 7, the deformation of single-wall C-Watt before 9mm, the deformation of single-Watt AW before 10mm, double-Watt BC Before the deformation of the concrete box is 18mm, the deformation value of the double-brake AB concrete box is 20mm, and the test force value should reach the effective value of the compressive strength. The better the carton quality, the higher the effective value of the compressive strength, and the less the deviation between the effective value and the final value.

According to the customer's product stacking height or stacking layer requirements, calculate the predetermined value of the compressive strength of the corrugated box:

P=KxC(H/h-1)x9.8 or P=KxC(C-1)x9.8
Where: P: - anti-pressure value, N;
K: - deterioration coefficient (intensity factor);
C: - single package gross weight;
H:-stack height; m
h:—Box height; Yang H/h: Take the whole position and apply it to both large and small people behind the decimal point.
C: - Stacking

(Text / Li Yutian)