Carton Packaging Quality Management

The quality of corrugated boxes is related to the safety protection of the packaged goods and cannot be damaged during the entire storage, transportation and sales process to realize the value of the goods. Therefore, the corrugated cartons must be sampled before delivery to determine if their quality meets the requirements for use. The following three checks are usually performed.
First, appearance quality:
1. Printing quality: the pattern and handwriting are printed clearly, the chroma is consistent, and the light is bright; the large position error of the printing position is no more than 7mm; the small box is no more than 4mm;
2. Closed quality: There are no loopholes around the box, and no gaps or gaps are left after the lids are closed.
3, size tolerances: box diameter and design size tolerances should be maintained in the large box ± 5mm, small box ± 3mm, the overall dimensions are basically the same;
4, the number of cover folding: corrugated box flap by opening, combined 180 degrees reciprocally folded more than 5 times, one, two types of box surface and inner layer, three types of boxes in the crack length sum is not more than 70mm;
In addition, the joint specification is required, the edges are neat, there is no overlap, and no obvious damage or smearing is allowed on the box surface.
Second, the carton compressive strength and influencing factors Carton compressive strength is the most important quality indicators of many commodity packaging requirements, the test will be placed on the corrugated box between the two pressure plate, pressurized to the pressure of the carton crushed, that is, the carton Compressive strength, expressed in KN.
1. Predetermined carton pressure strength The carton requires a certain degree of compressive strength, because the cartons stacked in the lowest layer during the storage and transportation of the packaged goods are subjected to the pressure of the upper carton. In order not to collapse, they must have suitable resistance. The compressive strength of the carton is calculated using the following formula:
P=KW(n-1)
In the P-carton compressive strength, N
W-Carton weight after loading, N
N-stacking number K-stacking safety factor stacking number n is calculated based on the stacking height H and the individual carton height h, n=H/h
The stacking safety factor is determined according to the number of layers of the stacking code of goods, and the national standard specifies:
Storage period is less than 30d to take K=1.6
Storage period 30d-100d take K=1.65
Storage period is greater than 100d to take K=2.0
2. Calculate the compressive strength of the carton according to the raw materials. After the compressive strength of the carton is predetermined, choose the appropriate carton board and corrugated paper to produce the corrugated carton to avoid the waste caused by blind production;
There are many formulas to calculate the compressive strength of the carton based on the ring pressure strength of the base paper, but the more concise and practical is the kellicutt formula, which is suitable for estimating the compressive strength of the 0201 carton.
3. The method of determining the compressive strength of the carton Because of the influence of various factors in the production process, the compressive strength of the carton produced with the raw material is not always consistent with the estimation result. Therefore, the method for accurately determining the compressive strength of the corrugated carton is to The carton is subjected to a constant temperature and wet treatment and tested with a carton compression tester; 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 is satisfied. Claim;
4. Factors affecting the compressive strength of the carton 1) Raw material quality The base paper is the decisive factor in determining the compressive strength of the carton, which can be seen from the formula of kellicutt. 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.
2) The moisture cartons are made of corrugated cardboard with high water content, or stored in a humid environment for a long time, 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.
3) The box-type box type refers to the type of box and the proportion of the same type 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.
4) Printing and aperture printing will reduce the compressive strength of the carton. Packing products with air permeability requirements to open holes in the box surface, or punching the handle hole in the box side will reduce the strength of the carton, especially the opening area is large, biased to one side, etc., the impact is more obvious.
5) Deviations in processing process In the process of box making, improper pressure lines, deep grooves, and unsound connections will reduce the compressive strength of the box.
Third, carton dynamic performance test For some of the specific commodity packaging, such as ceramics, glass products, electrical appliances, instruments, etc., but also to check the carton of the buffer properties of goods, that is simulated transport, handling, vibration, drop and other tests;
1. The drop test will drop the cartons behind the packaged goods from the prescribed height in accordance with the uninhibited posture, and examine the number of times that the packaged goods in the carton are good after a certain number of times, or the number of falls when the carton is damaged.
2. The slope impact test rotates the carton on the sled, then slides it off the slant of a certain height, and finally hits the baffle. It is similar to the emergency braking situation during transportation.
3. Vibratory test Place the cartons on the vibrating table after the goods are packaged so that they are subjected to vibrations in the horizontal and vertical directions, or two-way vibrations at the same time. After a certain period of time, check the condition of the goods or the time elapsed after the damage of the goods cartons.
4. Hexagonal drum rotation test The carton was placed in a hexagonal rotary drum equipped with an impact plate, rotated according to the specified number of rotations and times, and then the damage of the goods and carton was examined.
The above-mentioned 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.