Packaging Carton Quality Inspection Standard

[Chinese Packaging Network News] Carton according to size, divided into standard postal cartons and custom specifications of the carton, the postal standard carton is the most online sales of cartons, according to the largest, there are 12 to 12-12, carton Thickness has three layers, five layers, of course, there are thicker seven layers, the more the number of cardboard boxes, the more substantial, the seller can choose according to their own needs, different types of cartons, such as fragile, valuables can use five AA cartons, Ordinary wrestling items, or the product itself comes with a paper box, the choice of three layers is enough.

How to choose the size of the packaging carton

First, the size of the carton

Carton according to size, divided into standard postal cartons and customer custom specification cartons, postal standard cartons are currently the most online sales of cartons, according to the largest, there are 1 to 12 12 kinds, the specific dimensions can refer to the following figure:

It is not difficult to find that the standard carton is in the shape of a rectangular box. For the special specification products, such as keyboards, LCD monitors and other flat items, the seller generally chooses to find the carton factory to customize. The custom can not only customize the size of the specification, but also In the above printed on his own logo, it is very professional, custom need to open the mold factory, but also design printing costs, so the general starting price is higher, more than three or four hundred yuan to set.

Second, the thickness and material of the carton

The thickness and material of the carton are the two key factors that determine the hardness of the carton. The common carton has three layers and five layers of cardboard boxes. Of course, there are seven thicker layers. The more layers of the carton, the thicker the layers are. As shown in the figure below, the three layers are not Simple three-story flat plate, but two layers of flat sandwiches outside the middle of a layer of corrugated, five layers are three-layer flat plus double corrugated; three-layer, five-layer cardboard boxes are also listed corrugated and double corrugated cardboard boxes; carton material also has a variety of good The material is not only high in hardness, but also light in weight. Materials with poor hardness are often very low, and are easily deformed; the material of the carton on the market is "KK>KA>KB>AA>AB>BB" in order. KK is At present, the best material, the thickness of three layers is enough to carry a normal adult weight, smooth surface texture, KK is good, but the price is the most expensive, AA, BB material is slightly weaker, but with five The thickness of the layer, also has a high hardness, enough to protect the product from damage.

Sellers choose different types of cartons according to their own needs, such as fragile, valuable items can use five-layer AA cartons, ordinary falling items, or the product itself comes with a tray, select three layers is enough.

Third, how to choose the right carton for your product

At present, the domestic fast quality varies, often reports that a certain courier throws parcels at random, made the sellers cry, choose SF Express is good, but I am afraid that customers do not pay, so everyone in their own packaging Work harder and harder; good packaging not only guarantees the safe delivery of your goods to customers, but also allows customers to see the shopkeeper considerately and meticulously, if you receive a wrap-around moisture-proof courier bag today. Layer carton package, will not take care of the treasurer of the treasure. As mentioned above, there are three layers, five layers, standard size 1~12, KK, AA, BB and other materials. It is important to choose a carton that is suitable for your own product.

Here are some basic strategies to share:

1, according to their baby size to choose the appropriate carton specifications, here to illustrate is that the standard 1 to 12 carton size refers to the outer diameter of the carton; the size of the inside to be slightly smaller than two carton thickness.

2, different types of carton hardness, weight, pressure capacity are different, we all have a sense of cost, choose enough on the line, the goods have a carton can choose three layers, there is a certain pressure resistance can choose ordinary hardness carton, Fragile, fragile, high-strength cartons with high load-bearing capacity are required, and the space inside the box must be filled to prevent shock damage during the journey.

3, To tell the truth, the carton material hardness, bearing capacity, look at the picture to see the introduction is not like to see the real thing, you can enter a few samples of each sample, the actual comparison.

4. Although the carton profits are thin, the treasurer is generally not allowed to counter-offer, but once the long-term cooperation, the quality of the carton is recognized, and the price can still be preferential.

The following is a simple horizontal comparison of various types of carton, for reference only:

IV. Introduction to packaging materials:

Subsidiary materials include tape and bubble film, EPE, foam board and other fillers; tape has a lot of patterns, in addition to the most basic transparent and yellow opaque two, there are a lot of printing tape, as shown in the following blue warning Sentence tapes and special tapes. The warnings such as “moisture and pressure proofing”, “be careful of light release”, “please confirm the completeness of the goods after receipt” and other warnings are still quite practical; commodities are placed in boxes, not necessarily To fill up the space, it is often necessary to fill in some things to make it fixed. Everyone generally uses discarded newspapers, and the effect is good. Dedicated friends also use foam boards to separate the space inside the box and use bubble film and bubble paper to wrap the goods and fill in empty spaces;

Fifth, the shipping cost of the carton

The profit from carton sales is not very high, combined with the large weight, so the general factory is only sent to or within provinces and provinces within the province. The provincial express delivery and the provincial external logistics are all generally required. The express delivery fee is generally at least 10 kg and is weighed about 1 kg. Yuan around.

Packaging Carton Quality Inspection Standard

First, the appearance of quality

1.Printing quality: The pattern and the handwriting are printed clearly, the chroma is the same, and the light is bright; the printing position error large box does not exceed 7mm, the small box does not exceed 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 smudging is allowed on the box surface.

Second, carton compressive strength and influencing factors

The carton compressive strength is the most important quality indicator for many commodity packaging requirements. During the test, the corrugated box is placed between two pressure plates and pressurized to the pressure at which the carton collapses, which is the compressive strength of the carton, which is denoted by KN.

1, predetermined carton pressure strength

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 using the following formula: P = KW (n-1) where P---- carton compressive strength, N; W---- weight after carton loading, N; n---- stacking layer number ;K----stacking safety factor, stacking layer number n is calculated based on stacking height H and single carton height h, n=H/h

The stacking safety factor is determined according to the number of layers of the stacking code of the goods. The national standard specifies that: the storage period is less than 30 days, K = 1.6; the storage period is 30d-100d, K = 1.65; and the storage period is greater than 100d, taking K = 2.0.

2. Calculate the compressive strength of the carton according to the raw materials

After the carton compressive strength is predetermined, appropriate carton board and corrugated paper should be selected to produce corrugated cartons to avoid waste caused by blind production. There are many formulae for calculating the compressive strength of carton based on the ring-press strength of the base paper, but it is more concise and practical. The kellicutt formula is suitable for estimating the compressive strength of the 0201 carton.

3, determine the carton compressive strength method

Due to various factors in the production process, the compressive strength of the cartons produced with raw materials is not always exactly the same as the estimated results. Therefore, the ultimate method for accurately determining the compressive strength of corrugated cartons is to use carton compression after constant temperature and wet treatment of the cartons. Test machine test; For small and medium-sized plants without test equipment, a wooden board can be placed on the top of the carton, and the same amount of heavy objects can be stacked on the wooden board to roughly determine whether the carton compressive strength meets the requirements.

4. Factors that affect 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, as 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.

2) Moisture

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.

3) Box type

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 made of double-layer corrugated paperboard, and their compressive strength is obviously 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 Opening

Printing will reduce the carton compressive strength. 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) Processing process deviation

In the process of box making, improper pressure lines, deep grooves, and poor bonding, will reduce the compressive strength of the box.

Third, the carton dynamic performance test

For some specific commodity packaging, such as ceramics, glass products, electrical appliances, instruments, etc., we also need to test the cushioning performance of the cartons on the goods, that is, simulation of transport, loading and unloading, vibration, drop and other tests;

1, drop test

The cartons after the packaged goods are dropped from the prescribed height in different postures, and the number of times that the packaged goods within the carton are perfect after a certain number of inspections, or the number of times the cartons are damaged when the carton is damaged.

2, slope impact test

Rotate the carton on the trolley, then slide it off the slope of the height and finally hit it. It is similar to the emergency braking situation during transportation.

3, vibration test

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 after the cartons of the goods are destroyed.

4, Hexagonal drum rotation test

Place the carton in a hexagonal rotary drum equipped with an impact plate, turn it according to the specified number of revolutions and times, and then check the damage of the goods and carton. 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 two parties.