Haida tells you how to measure the strength of the carton

Usually , the test standard for testing the strength of the carton has many requirements, such as the appearance quality, Printing quality, closed quality, dimensional tolerance, number of folds of the cover, etc. In general, the joint specification is required, the edges are neat, there is no overlap, and the surface of the box is not allowed. Significant damage, or smudges and other patterns, handwriting printing clear, uniform color, bright and bright , the box diameter and design size tolerance should be maintained in the large box ± 5mm , small box ± 3mm , the overall dimensions are basically the same , no loophole around the box After each box cover is closed, there is no staggering or sloping , the printing position error box is no more than 7mm , the small box is not more than 4mm, the corrugated box swing cover is opened, and the 180 degree reciprocating folding is more than 5 times, the first and second types of boxes face The sum of the lengths of the cracks in the inner layer and the inner layer and the three types of boxes is not more than 70mm . The corrugated box is placed between the two pressure plates during test, and the pressure at the time of pressurization until the carton collapses is the compressive strength of the carton, which is denoted by KN .

The carton compressive strength has always been the most important quality indicator for many commodity packaging requirements. Base paper is the decisive factor in determining the carton compressive strength, which can be seen from the kellicutt formula. However, the influence of other conditions in the production process of corrugated cardboard can not be ignored, such as the amount of adhesives, impregnation, coating, and composite processing.

The carton requires a certain degree of compressive strength, because the carton stacked in the lowest layer during the storage and transportation of the packaged goods is subjected to the pressure of the upper carton. In order not to collapse, it must have a suitable compressive strength, and the carton withstand pressure. The strength is calculated by the following formula. Due to various factors in the production process, the compressive strength of the carton produced with the raw material is not always exactly the same as the estimation result. Therefore, the method for accurately determining the compressive strength of the corrugated box is to humidify the carton at the end. After treatment, the carton compressive testing machine is used for testing; for small and medium-sized plants without test equipment, a wooden board can be placed on the carton, and an equal amount of heavy objects can be stacked on the wooden board to roughly determine whether the carton compressive strength meets requirements. There are many formulas to calculate the compressive strength of the carton. However, the more concise and practical is the kellicutt formula, which is suitable for estimating the compressive strength of the 0201 carton.

The box type refers to the type of box and the ratio of the same kind of box, and they have a significant influence on the compressive strength. Some carton boxes are composed of double-layer corrugated paperboards, and their compressive strength is significantly higher than that of single-layer boxes of the same specifications. Under the same conditions, the higher the box, the worse the stability and the lower the compressive strength. Carton boxes are made of corrugated paperboard with high water content, or stored for a long time in a humid environment, will reduce its compressive strength.

Fiber is a kind of strong water absorption. In the rainy season and high humidity in the air, the moisture balance between the moisture in the paperboard and the atmospheric environment is very important. In the process of box making, improper pressure lines, deep groove, and poor bonding will reduce the compressive strength of the box. Put the carton into the hexagonal rotary drum equipped with an impact plate, and turn according to the specified number of rotations and times. Then check the damage of the goods and carton. Dynamic experiments are destructive. To improve the resistance to damage of cartons and commodities is to use cushioning liners, partitions or other protective measures when packaging goods.

In addition, some packaging cartons also need to be sprayed, weatherproof and other experiments, according to the contractual agreement between the parties. The cartons are placed on a vibratory table after being packaged, so that they are subjected to vibrations in the horizontal and vertical directions, or they are simultaneously subjected to vibration in both directions. After a certain period of time, the goods are inspected or the time elapsed when the cartons of the goods are destroyed.