Corrugated paper and carton strength test and analysis (2)

Second, the carton performance test

Corrugated cartons can replace most wooden boxes, but the main reasons for not replacing wooden boxes are: 1. Less resistant to water and moisture than wooden boxes; 2. Easy to be pierced by sharp hard objects; 3. Compressive strength is not as good as wooden boxes . In particular, the last point is particularly influential. Therefore, it is of great significance to study how to improve the compressive strength of corrugated boxes.

The corrugated box is a packaging container, and its test can be performed according to the requirements of the packaging container. The main test items are:

1. Carton Pressure Test The carton pressure test is the compression test and is the most basic test for carton performance. Through this test, the ability of the carton to withstand pressure in different conditions can be determined.
The equipment used for the carton pressure test is a carton-specific pressure tester. The tester bench has a relatively large pressurizing area. Generally, the area of ​​the upper and lower platens is 1.5m*1.5m or 1m*1m. One of the two pressure plates is a support plate, the position of which can be adjusted according to the size of the sample, so that it has a suitable height, and then it is fastened; the other is a pressure plate that can slide along the guide rod, Apply pressure to the sample.

2. Drop Test of Carton Drop test is a commonly used test for general merchandise packaging. It is also used in corrugated cartons. Drop tests can be used to test the physical strength of the contents under different drop conditions. At the same time, the performance of the carton and the buffering effect of the carton structure can also be determined through experiments.
Drop test is a simple and applicable test. It is suitable for packages with a total weight of 150kg or less. The equipment used in the testing machine is relatively simple and can be used with a drop tester or a spreader tester.

3. Bevel Impact Performance For heavy or bulky packages, such as large packages weighing up to 150 kg, a bevel impact test can be used to test the impact resistance of the package and its contents. Slope impact tests can imitate the strong impact loads caused by trains, car starts, brakes, and downhill slopes. In addition, this experiment can also provide similar experiments for various shock loads caused by the transport process (such as the transport of goods through the belt, lifting, unloading and other links). The test device is a crash tester consisting of slides, blocks, and baffles.

4. Hexagonal Drum Test Hexagonal Drum Test is a comprehensive test that simulates various loads on the outside during the transport process of a carton containing contents. This test can imitate the situation in which the cartons enter the warehouse, the machine compartment, and the carriage from the conveyor belt, or the cartons are transported from one floor to another by the conveyor belt. The tumbling drop of the carton in the testing machine is arbitrary and there is no certain rule. This natural drop of the carton can fall on the baffle of the drum, or it can fall on all corners, sides, and sides of the drum to provide various load tests for the carton.
Through this test, two purposes can be achieved: simulating the shock and vibration that the carton may encounter in the transportation process, determining the ability of the carton to withstand these shocks and vibrations; and measuring the protective capabilities of the carton, the inner packaging and the shockproof material against the contents. In addition, this test is also useful for determining the reliability of joints and closures of cartons. This test was measured on a hexagonal drum tester.

5. Vibration and anti-vibration performance test The carton will undergo vibrations of different frequencies and amplitudes during transportation, affecting the carton and contents, such as carton deformation, cracking, surface abrasion, ink stain, etc. The vibration test can simulate the transportation process. In general vibrations, it is also possible to carry out some accidental vibrations of known parameters. Due to the wide range of vibration frequencies in the transportation process, the test involves two aspects: First, the carton is placed tightly on the vibration table, and the test carton withstands the fatigue caused by repeated vibrations and the ability to vibrate at high frequencies; the other is Put the carton tightly on the shaker table and check if low-frequency vibrations cause resonance in the carton contents. This test is suitable for items such as electronic instruments that are sensitive to low-frequency vibrations.

The vibration table for carton vibration test can generate 1-80Hz vibration frequency and 0.5-10g (g=9.81m/s*s) acceleration. The test box can be placed on the shaking table. According to the test requirements, the box can be fastened or allowed to move freely. The test can imitate the stacking conditions during transportation and apply a simulated force load to the sample. Shakers should also meet the requirements that are compatible with the total load of the stacking cartons and content items.

The basic method of the test is to reproduce the vibrations in the transport process, such as in the train compartment, in the car compartment, and in the aircraft cabin, under experimental conditions. The load of vibration depends on the type of transport.

When testing the vibration resistance of the carton, the number of patterns is adapted to the actual situation. The stacking quantity of cartons is generally not less than 3, and the total stacking height should depend on the type of transport. The stacking height of railway transportation is generally 2.5m, the automobile is 2m, and the air transport is 1.5m. The termination time of the test is determined by the breakage rate of the carton. The degree of damage includes the seams of the carton and the damage of the adhesive wall.

6. Spray test The corrugated box shall be sprayed under the specified conditions for the specified time and the amount of water sprayed to assess the ability of the carton to withstand water ingress and the ability of the carton to protect the contents.

7. Other tests include weatherability tests and friction performance tests.