Strength Test and Analysis of Corrugated Paper and Cartons (Part 2)

Strength Test and Analysis of Corrugated Paper and Cartons (Part 2)

The puncture strength was measured with a puncture strength tester. The tester uses a pendulum equipped with a piercing head to measure the ability of the board to resist piercing with the change in potential energy before and after piercing through the cardboard, and convert the change in potential energy into kinetic energy to pierce and tear the cardboard. to express the puncture strength of paper or cardboard.

7. Adhesive strength

Adhesive strength refers to the bonding strength of corrugated paper and face paper or lining paper. Apply an outward pulling force perpendicular to the surface of the face paper or corrugated core paper, respectively, until the two are separated. The maximum load that the interface of the binder or the binder fiber can bear before separation is the bond strength of the specimen, also known as the peel strength, in N.

Adhesive strength can be measured with a small pressure tester. The tensile force applied to the face paper and corrugated core paper is generated by inserting the upper and lower sets of corrugated rods, so this test is also called the pin bonding strength test.

The type of test bar depends on the type of corrugated board to be tested. The long set of test bars is inserted under the corrugated core paper, and the short set of test sticks is inserted under the corrugated core paper. Then the upper side is pulled up and the lower side is pulled down to measure the bond strength of the weaker side of the two bonding surfaces. When a long set of test rods are inserted into the upper or lower side of the core paper at intervals, and a short set of test rods are also inserted into the same side of the core paper at intervals, the bond strength of the side connected to the test rods can be measured.

Second, the performance test of the carton

Corrugated boxes can mostly replace wooden boxes, but the main reasons for not completely replacing wooden boxes are: 1. Water resistance and moisture resistance are not as good as wooden boxes; 2. It is easy to be punctured by sharp hard objects; 3. The 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.

Corrugated boxes belong to packaging containers, and the test can be carried out according to the requirements of packaging containers. The main test items are:

1. Carton pressure test

The carton pressure test is the compression test, which is the most basic test for the performance of the carton. Through this test, the compressive capacity of the carton in different states can be determined.

The equipment used in the pressure test of the carton is a special pressure testing machine for the carton. The pressurized area of this test machine table is relatively large. 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, and its position can be adjusted according to the size of the sample to make it have a suitable height, and then fasten it; the other is a pressure plate, which can slide along the guide rod, Apply pressure to the sample.

2. Drop test of carton

The drop test is a test commonly used for general commodity packaging, and is also used for corrugated boxes. Through the drop test, the physical strength of the contents can be detected under different drop conditions. At the same time, the performance of the carton and the buffering effect of the carton structure can be determined by the test.

The drop test is a simple and applicable test. It is suitable for packages with a total weight below 150kg or a smaller volume. The equipment used in the testing machine is relatively simple, and a hook drop testing machine or a support plate testing machine can be used.

3. Incline impact performance

For heavy or bulky packages, such as large packages weighing more than 150kg, an inclined plane impact test can be used to test the impact resistance of the package and its contents. The slope impact test can simulate the strong impact loads caused by trains, cars starting, braking and going downhill. In addition, this test can also provide a similar test for various impact loads caused by the transfer process (such as the goods passing through the conveyor belt, lifting, unloading, etc.). The test device is a crash test machine composed of slides, pulleys and baffles.

4. Hexagonal drum test

The hexagonal drum test is a comprehensive test that simulates various external loads on the carton with the contents inside during transportation. This test can imitate the carton from the conveyor belt into the warehouse, the engine room, and the carriage. Two purposes can be achieved through this test: simulating the shock and vibration that the carton may encounter during transportation, and determining the carton's resistance to these shocks and vibrations. Ability; Determining the protective ability of cartons, inner packaging and shock-proof materials to the contents. In addition this test is useful for determining the reliability of the joints and closures of the carton. This test is determined on a hexagonal drum tester.

5. Vibration and anti-vibration performance test

The carton will be subjected to vibration of different frequencies and amplitudes during transportation, which will affect the carton and its contents, such as deformation and rupture of the carton, surface wear, ink contamination, etc. The vibration test can simulate the general vibration during transportation, or A random vibration of some known parameters is performed. Due to the wide range of vibration frequencies during transportation, the test includes two aspects: one is to put the carton on the vibrating table without tying it tightly to test the ability of the carton to withstand fatigue and high-frequency vibration caused by repeated vibration; Tie the carton tightly on the vibrating table and check whether the low frequency vibration will cause resonance in the contents of the carton. This test is suitable for items that are very sensitive to low frequency vibration, such as electronic instruments.

The vibrating table used for the carton vibration test can generate a vibration frequency of 1-80Hz and an acceleration of 0.5-10g (g=9.81m/s*s). The test cartons can be placed on the vibrating table, and the cartons can be fastened or allowed to move freely according to the test needs. During the test, the stacking situation during transportation can be simulated, and a simulated force load can be applied to the sample. The vibrating table should also meet requirements commensurate with the total load of the stacked cartons and contents.

The basic method of the test is to reproduce the vibration during transportation under experimental conditions, such as in a train car, in a car cabin, in an aircraft cabin. The load of vibration depends on the type of transport.

When testing the anti-vibration strength of the carton, the number of patterns should be 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 transportation. The stacking height of railway transportation is generally 2.5m, that of automobiles is 2m, and that of air transportation is 1.5m. The termination time of the test is determined by the breakage rate of the carton. The degree of damage includes damage to the seams of the carton and the bonded box walls.

6. Spray test

The corrugated box is sprayed for the specified time and water under the specified conditions, and the ability of the carton to withstand water invasion and the protection ability of the carton to the contents are evaluated.

7. Other tests

Including weather resistance test and friction performance test.