4. Corrugated box size and length, width and height of the relationship
Taking into account the corrugated cartons in the storage and transportation process and the volume of the relationship between the vehicles, and its packaging stability, strength and the same material under the package of more content and other factors. For the relationship between the size and length, width and height of corrugated boxes, the standardization of carton dimensions should be considered as much as possible. When the product packaging in China is designed for size, it should try to match with the standard trays, containers, and counter sizes and be in line with international standards. For this purpose, the outer dimensions of the bottom area specified in the national standard “Rigid Cube Transport Package Size Series†shall be used preferentially. The base dimensions shall be 400×600°. The coefficient of the packaging dimensions shall be referred to as the packaging module size, and the standardized packaging size shall be the packaging model. The number size is consistent and there are corresponding provisions in the new standard.
"When the maximum internal size and maximum value of the corrugated box are not in the same category, the high kind should be selected." This applies to the new standard of Corrugated Box. The U.S. CCF standard sets a uniform standard for the size of corrugated boxes. CCF standard carton specifications: full-size (60cm × 40cm), half-size (40cm × 30cm), it is worth learning.
5. The significance of the standards and standards of use for the moisture content of corrugated boxes
The paper packaging material is hydrophilic, and its moisture content has a great influence on the strength. Due to the influence of the external environment, the moisture content in the paperboard also changes at any time, which in turn causes a change in the strength of the corrugated board. If only the intensity index is specified in the standard, and the state in which the measured object is measured is not specified, it is a one-sided detection and cannot be operated strictly. Therefore, the national standard GB6544-86 “corrugated cardboard box†specifies that the moisture content of the corrugated cardboard is 10 ±2%, and measured after standard environmental treatment, this point is consistent with foreign standards, such as the Japanese standard, can be used to explain the various strength indicators corresponding to the state of the cardboard.
According to the national standards, the delivery moisture (according to online moisture) of corrugated paperboard is 14±2%. This refers to the online moisture in the production of corrugated paper. This kind of provision does not guarantee that the moisture content of corrugated board does not occur to customers. Change, and the corrugated box is calculated according to the square number when trading, will not suffer from loss of a certain aspect of supply and demand due to moisture content problem, so there is no need to specify the moisture content index of delivery.
The actual influence of the moisture content of the corrugated cardboard on the board is mainly whether it can be suitable for the next process and process operation, and is an indicator required in production control. As for the moisture content specified in the original standard, it refers to the online moisture determined by the board manufacturer. I believe that the online moisture content of corrugated board is only for reference.
6. About type test
In the "Corrugated Paper Containers" new standard, only in the "Inspection Classification", it states: "Type inspection items are all technical requirements." The original standard states: "Newly designed corrugated boxes or corrugated boxes are changed or remanufactured. Type test should be carried out. "Type test items ... or agreed by the supply and demand sides." "Improve the unqualified items ... until the test carton is all qualified." The new standard specifies the "type test" qualification criteria for "All tests meet the requirements of the inspection standards. If one of the tests fails, the type test is unqualified." The new standard "7.2.2 tests the carton according to the requirements of this standard, and there are two unqualified items." To distinguish it from the general test.
Corrugated box empty box compressive strength is an aspect of its own strength, but it is not able to meet the storage and transportation environment requirements for the determination of the only criteria for compressive capacity, but also should be balanced with the contents of the comprehensive consideration. For a package, its compressive strength is directly related to the contents, including the nature and shape of the contents (rigid or non-rigid, whether it can be pressed, etc.), loading method (whether full, can play a supporting role Wait). Compressive capacity only represents one characteristic of the corrugated box itself as a factor to consider when selecting it. Therefore, this standard retains the provisions of the pressure test.
As for the impact test, from the point of view of the test itself, it is not the characteristics of the corrugated box itself, but it functions together with the package consisting of the contents, the liner, and the bundle. Different carton boxes have different contents, and the impact resistance of the whole package is different. This test does not make sense for empty containers. Therefore, this standard cancels the relevant test requirements. It is suggested that for corrugated carton packaging of specific products, relevant tests can be considered based on the nature of the contents and the pre-circulation environment.
7. Settlement inspection and factory inspection
If the two are equal, then the normal sampling inspection plan will be used. The inspection sample for level II will be larger, and the normal sampling secondary sampling plan will be used instead. The special inspection level is S-2. The general type test is carried out on whether the newly designed corrugated box or the corrugated paperboard whose material is changed meets the requirements of the order. It is applicable to the first part (not limited to the first part) inspection and must be verified during the product design and development phase. It is to ensure that the transport package protects the contents. The test items are mainly drop and stacking tests. Some special requirements include impact/vibration/spray tests, and the samples for type testing must be packed (or Similar substitutes) for the carton.
Inspection rules: The original standard stipulates rules for inspection of corrugated boxes, but taking into account the different circumstances of production companies, and the requirements of users are not the same, and there are corresponding national standards on sampling plans, qualification judgments, etc. when necessary. The inspection rules can be formulated according to the corresponding standards and specific needs. This standard adopts the normal secondary sampling plan of GB/T2828.1-2003, inspection level II, AQL = 6.5; as in the last row of Table 2 in the standard, the first sampling is 200, if there are 11 or 11 qualified , The subcontract was unqualified; 16 or more were unqualified and the subcontract was unqualified; if 12 to 15 were qualified, the second sample size was used; if the subsampled inspection accumulated nonconforming product, less than or equal to 26 Approved for approval, cumulatively greater than or equal to 27, unqualified.
8. Calculation of corrugated box compressive strength
About Appendix C, C1 corrugated box compressive strength calculation method, according to the corrugated cardboard ring pressure strength calculation carton compressive strength, its calculation formula: P = 5.87xPmx (H × Z) 1/2 (this formula by the following formula Conversion Mackee formula P = 5.874 × Pm × H0.508 × Z0.192 = 5.87 × Pm × (H × Z) 1/2 corrugated boxes are applicable). Pm is the corrugated paper side pressure strength, H is the corrugated paper thickness, and Z is the perimeter of the carton. It is unreasonable to use the pressurization strength as a standard for the inspection of cartons. It is necessary to use the side pressure as a standard to reflect the true results.
The calculation method for the compressive strength of the carton is based on the Machi formula: P=5.87 PmT1/2Z1/2, which is consistent with the formula for compressive strength proposed above: P=5.87×Pm(H×Z)1/2. This formula not only suits the market demand, but also facilitates the selection of standards.
Makey formula is the side pressure strength of the tested corrugated board, and then the compressive strength of the corrugated box is calculated according to this empirical formula. That is to say, the side pressure strength, board thickness and carton perimeter of the board are known, and its compressive strength The strength is basically determined, which is the inherent property of the carton.
Corrugated box compressive strength formula:
C.1 Corrugated box pressure resistance P (N) is not less than the calculated value of the following formula: P = K • G [(Hh) / h] (N) where: K is the safety factor; G is corrugated carton packaging The weight, N; H is the stacking height, m ​​(generally no higher than 3m); h is the height of the corrugated carton, m.
C.2 The safety factor K should be determined according to the actual environmental conditions of storage, transportation and circulation, including climatic and environmental conditions, mechanical and physical environmental conditions, and storage and transportation time, etc. It can generally take more than 1.65, which can not serve as a support. the above.
In the original national standard, the formula for calculating the compressive strength of a corrugated box was defined as the concept of pressure, that is, the pressure per unit area. For corrugated boxes, most of the actual storage and transportation conditions are the same packaging pieces placed on each other, and the test method of bearing the pressure is also the same, because the carton has a supporting role around its periphery. Therefore, the pressure rating of the overall packaging box is more Close to the actual situation. Therefore, the original concept of pressure was modified to the concept of pressure.
In addition, the requirements on the compressive strength of the carton should be related to the nature and status of the contents (as described in the standard 4.6). For those packaging materials that cannot support the contents, only the corrugated boxes are under pressure, The safety factor K should be larger, otherwise it should be relatively reduced to save costs and materials. Therefore, the content as an informative appendix is ​​for the user's reference only.
The above standard calculation formula is based on the possible stacking height and weight plan, a value that is actually needed, and then design or check the carton based on this value.
9. About the moisture-proof problem of corrugated boxes
The safety of the corrugated box strength depends on factors such as the temperature of the atmosphere, the moisture content of the carton, the storage time, the storage method, the transport conditions, and the manufacturing conditions of the corrugated box. The new standard states: "The performance of corrugated boxes (such as moisture-proof, etc.) for which special requirements are required shall comply with other relevant standards or regulations." If it is resistant to moisture (tear strength burst strength), the corrugated box is placed in a constant temperature and humidity box with a temperature of 30°C±2°C and a relative humidity of 90%-95% for 24 hours. After the removal, the corrugated box is subjected to a moisture resistance test. Breaking strength (measured within 1h) is called "tidal test". The result should be a corresponding standard. In particular, the export category (carton type 1) should be tested under the same humidity conditions according to the standard, and humidity is exactly an important factor in the test results. This shows the importance of the "damp-resistant" test. However, domestic sales and Type 2 cartons are not subject to "tidal tests."
The safety rate of corrugated boxes is about 2-8 times that of the lowermost cartons. Generally, it can be divided into the following situations: (1) The content object itself can withstand part of gravity, and the transportation conditions and storage conditions are good. The safety rate is 2.0 to 2.5 times; (2) In the case of normal conditions, the safety rate is 3.0 to 3.5 times; (3) The atmospheric humidity is high, and the content has a moisture release property, and the safety rate is 4.0 to 8.0 times.
Major differences between the new national standards and JIS
The standard differs from JISZ1506 "Corrugated Shipping Containers" in the expression of the carrying capacity of corrugated boxes and the maximum overall size (see Table 3 and Table 4).
The relevant circumstances are described as follows: Classification: JIS standard only one type of carton, the new national standards are divided into two categories, the same reasons as described in 2. Division method: This standard is based on the quality of the contents of the corrugated box, and the JIS standard is divided by the total weight, that is, the quality of the contents + empty box + the quality of the strapping and other accessories. The division method of the JIS standard is more accurate, but taking into account the convenience and habits of users in China, and for the corrugated box, the empty box quality is relatively small, it also maintains the original division method that is divided according to the quality of the contents. The concept of the contents refers to the concept of accessories such as products and pads.
Carrying capacity and maximum overall size: The new national standard divides each type of corrugated box into 5 types, while the JIS standard is divided into 4 types (see Table 4).
For a single corrugated carton, the new standard adds a 5kg carton. For double corrugated cartons, the new standard adds a 15kg and 55kg cartons, and a 50kg cartons less. Taking into account the situation of China's carton and the principle of proper tailoring and proper packaging, it is reasonable to divide more than one grade.
In addition, from the overall point of view, the maximum overall size requirement of this standard is relatively smaller than that of JIS. In theory, under the same circumstances, the overall size is small, and its carrying capacity is large.
Corrugated carton code: The code for the new standard corrugated carton is B, which is the English prefix of the box, and JIS is the C, which is the Container English prefix. Different from the two standard English names, the new standard is CorrugatedBoxes, and the JIS standard is CorrugatedContainers. The meaning of Container is wider than that of Box, but considering the habit of use and the difference is not large, it still maintains the original code. (End of the article)
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