The following Kunshan Carton Factory introduces the acceptance criteria for carton quality. According to the different application channels of the cartons, the cartons are mainly divided into two categories: domestic cartons export cartons. As the name suggests, export cartons are used to ship export goods, domestic cartons are used to ship domestic For circulating goods, different inspection requirements have been formulated for the two categories.

GB/T6544 "Packaging Material Corrugated Board"

　　 GB/ T6543 "Corrugated Box"

　　 GB/T5034 "corrugated cardboard for export product packaging" GB/T5033 {corrugated cardboard box for export product packaging" GB/ Tl91 "graphic signs for packaging, storage transportation"

　　 GBl90 "Dangerous Goods Packaging Marks" etc.

Specific measurement method

　　 GB/T6548 "Determination of Corrugated Board Adhesive Strength"

　　 GB/ T6546 "Determination of the edge compressive strength of corrugated board"

　　 GB/ T4857.4 "The basic test pressure test method of transport package"

　　 GB/ T4857.3 "The basic test stacking test method for transport packages"

　　 GB/T4857.5 "Vertical impact drop test method for basic test of transport package"

　　 There are also standards formulated according to the shipment of different commodities, such as: GB/T4856 "Knitted Cotton Fabric Packaging" so on. There are many industry standards involved, among which

　　 is the People’s Republic of China’s Entry-Exit Inspection Quarantine SN/T0262 "Exported Commodity Transport Packaging Corrugated Box Inspection Regulations".

　　IS0 standard.

　　Carton acceptance method

　　Cartons nailed by flat wires require that the flat wires have no rust spots, peeling, cracks other defects in use;

　　The box body is square, the surface is allowed to have obvious damage stains;

　　The printed graphics on the box surface are clear, consistent in depth accurate in position. The name code of the carton manufacturer must be printed on the lid;

　　 The width of the carton joint nails the overlap tongue is 35mm-50mm. The metal nails should be in the middle of the overlap tongue. Use diagonal nails (450) horizontal nails. The box nails should be arranged neatly evenly.

　　Single-row nail distance ≤80mm, head tail nail distance ≤20mm at the edge of the indentation line. There should be no overlapped nails, warped nails, no corners, etc.;

　　 carton joint bonding lap tongue width ≥ 30mm, uniform adhesive coating;

　　Carton indentation line width: single corrugated carton ≤12mm, double corrugated carton ≤17mm, so that after the flap is folded, the fold line is centered without breaking;

　　 The carton flap is opened closed 180 reciprocating folds more than 5 times, l, 2 types of surface paper lining paper must be cracked, 3 types of box surface paper must be cracked, the total amount of lining cracks ≤ 70mm;

　　GB/T5033 is slightly different GB/T6543 in appearance inspection: double nail box nail distance ≤75mm, single nail box nail distance ≤55mm;

　　SN/T0262 standard, more requirements are: no splicing, lack of material, exposed flute, wrinkles, penetration of carton surface paper. The inner paper is allowed to be spliced more than two pieces, the seam distance the indentation line is ≥30mm, the degumming area is ≤20cm per square meter, the carton flap is opened closed 2700 reciprocating folds 3 times. The paper the inner paper shall be cracked.

　　 Corrugated Box Physical Performance Test

　　 Before the physical performance test of the corrugated carton, the carton should be placed in a temperature of 23±2℃, a relative humidity of 50%±5% for pretreatment for 24 hours.

　　 under the test (except moisture content).

　　 water content

　　 In the standard, the moisture content refers to the moisture content of the corrugated board after 30 minutes to 60 minutes after leaving the machine. The standard range is slightly different due to different standards.

　　 Confirm before inspection.

　　 thickness ("GB/T6547-1998 Corrugated Board Thickness Measurement Method")

　　 refers to the measured distance between the two parallel planes of the thickness gauge under the specified pressure.

　　 Piercing Test ("GB/T2679. 7-1981 Determination of the Puncture Strength of Cardboard")

　　 refers to the work required to penetrate the cardboard with a pyramid of a certain shape. It is a scenario a cardboard box is suddenly damaged by a hard object during transportation.

　　 Bursting Test ("GB/T6545-1998 Determination of Bursting Strength of Corrugated Board")

　　 refers to the uniformly increased max pressure value perpendicular to the sample surface that the corrugated cardboard can withstand per unit area under the test conditions.

　　 Edge compression test ("GB/T6546-1998 Corrugated Board Edge Compression Strength Determination Method")

　　 Detect the pressure per unit length of corrugated board.

　　 adhesion test (also known as peel test) ("GB/T6548-1998 corrugated board adhesion strength determination method")

　　 is an index reflecting the adhesion fastness between layers of corrugated cardboard.

　　Empty box compression test

　　Check the pressure that the carton itself can bear according to the calculation formula:

　　P=K·G(H/h一1)X9. 8

　　P: compressive strength value, N: K: deterioration coefficient,

　　G: the gross weight of a single carton, kg; H: stacking height, m(3m); h: the height of a single carton, m; H/h: must be an integer, less than one

  One

　　 calculation. Deterioration coefficient K: The comprehensive dimension of max inner diameter refers to the sum of the length, width height of the carton. When the mass of the content the comprehensive size of the max are in the same file

When 　　 times, it should be based on the higher standard. As long as one test item is unqualified, this batch of cartons is unqualified. The main items of the transport performance test are:

　　 drop test

　　 Pack the carton according to the shipping state, (quantity 3) according to the weight of the carton, transportation method, determine the drop height, a carton drops a corner constitutes the corner

The three sides three edges of 　　 are damaged.

　　 Stacking test The cartons are packaged according to the shipping state, a certain load (quantity 3) is stacked on it.

　　 load according to the formula:

　　M=(H/ h一 1)G

　　 : M--stacking weight imposed on the carton, kgH--3 meters h--carton height, m

　　G--The gross weight of the cartons of the loaded goods, the kg stacking time is 24 hours, the cartons are collapsed damaged, which is qualified.

　　Other test methods include vibration, shock so on. In addition to the above detection items, there is also an important trend, which is the detection of heavy metals, especially

　　Packages products exported to the EU must be tested for mercury, lead, chromium, arsenic, cadmium other elements. Such as cartons for dangerous goods, such as paint, incense

Water capital

　　 belongs to this category. The United Nations has a recommendation on the transportation of dangerous goods.

　　Carton boxes for transporting dangerous goods are tested according to this requirement. Determine the intensity of the test according to the risk of the contents of the carton. The main test items are falling,

　　 Stacking. Since China joined the WT0, more more attention has been paid to food packaging. The main testing items are coliform bacteria, pathogenic bacteria, heavy metal content.

Inspection Judgment Rules

　　 This standard adopts GB/T2828.1-2003 normal sub-sampling plan, general inspection level I, AQL=6.5.

　　 Although the defect level is clearly mentioned in this standard, it is actually designed according to this;

　　①Fatal defect: The compressive strength of an empty box, as long as one sample fails, the whole batch is failed:

　　②Severe defect: The folding endurance of the flap, as long as the index is unqualified, the carton is unqualified;

　　③Minor defect: Only two defects in the same carton are required to cause the carton to be unqualified. If the number of unqualified numbers reaches the rejected number, the whole batch is unqualified;

　　 Whether the carton pressure resistance stacking test meet the requirements, two standards must be specified: inspection status standard physical index standard.

　　Inspection status analysis

　　The packaging industry usually adopts the following two inspection states of packaging materials:

　　 The temperature humidity of the carton sample are (23±2) ℃, (50±5)% pretreatment for 24h.

　　 Standard source: SN/T02693-93 "Rules for Inspection of Corrugated Boxes in Transport Packaging of Export Commodities".

　　 The standard atmosphere for testing pulp, paper cardboard should be relative humidity (50±2)%, temperature (23±1) ℃, general paper pretreatment 4h, thin paper at least 5

　　～8 hours, high basis weight other paper grades at least

　　 takes 48 h longer.

　　 Standard source: GB/T10739-1989 "Standard atmosphere for processing testing of pulp, paper cardboard samples"

　　The purpose of setting the carton test pretreatment is to keep the fiber structure of each sample in a balanced stable state, so as to cause excessive differences in the test results affect the paper

　　The determination of the mechanical properties of the box.

　　 Corrugated boxes should use the first pretreatment method.

　　 Discussion on safety anti-pressure stacking test

　　 concept expression

　　 Compressive resistance is the compressive yield value of max that the carton can continuously evenly apply pressure to.

　　 Stacking (standard name-static load stacking) is to apply a constant mass to the carton packaging within a certain period of time (usually 24h), whether the deformation damage of the carton meet the requirements.

　　 We can intuitively understand their differences through the test force time graph:

　　 formula calculation

　　①Safety anti-stress

　　P=K*G*(H/h-1)*9.8

　　P……anti-pressure value N;

　　K...... Deterioration coefficient (safety compression coefficient);

　　G……Single package gross weight kg;

　　H……Stacking height m.;

　　H…… Box height m.

　　 Storage period Less than 30 days 30～100 days More than 100 days Remarks deterioration coefficient 1.6 1.65 2 Export cartons are usually made of European American safety

　　 Compression coefficient 3

　　Note: The deterioration coefficient (strength coefficient) K is determined according to the loaded goods storage conditions.

　　②Stacking quality

　　M0=K* (H/h-1)* M1

　　M0……The total mass of stacking applied to cartons kg ㎏;

　　K……Deterioration coefficient (same as safety compressive coefficient);

　　M1……Single package gross weight kg ㎏;

　　H……stacking height;

　　H……Box height m.

　　 Discussion on related issues: The determination of the deterioration coefficient implies that under various storage transportation conditions, the pressure-bearing capacity of cartons cannot meet the pressure resistance requirements under standard test conditions (such as comparison of humidity conditions).

　　大), but because this coefficient is a safe compressive coefficient, its "safety" is to satisfy the carton in:

Decrease in strength under different atmospheric conditions; weaken the strength of handling storage; weaken the strength of load stacking over time; weaken the strength of transportation vibration shock other changes in atmospheric humidity logistics conditions, will cause collapse swelling deformation. The protective effect of packaging.

　　 So as long as the carton is designed manufactured to be qualified (meeting the requirements of safety pressure resistance), the pressure resistance tested in the non-standard state is less than the safety pressure resistance standard, but it is still "

　　Safe", realizing this,

　　We can further understand the test differences of cartons in different states through the following example data:

　　Comparison items

　　 carton model

　　 paper match with outer diameter size

　　 Under different test states

　　 Compressive resistance test value (㎏ f)

　　 Anti-pressure requirement value (㎏ f)

　　Temperature 18℃

　　 humidity 79%

　　Temperature (23±2) ℃

　　Humidity (50±5)%

　　M102 A=A 316*260*235 289 342 320

　　M103 A=A 302*244*235 296 335 305

　　M106 A=A 502*276*273 321 401 296

　　 Note: The above test values are average values.

　　 the above table, we can clearly understand that although the test results under non-standard conditions with high humidity conditions do meet the requirements of safety pressure resistance, it cannot be determined that the carton packaging products do meet the standards.

　　 On the contrary, in the case of low humidity conditions, although the test results meet the requirements, the design manufacturing do mean that they are qualified.

　　How to correctly effectively assess whether the carton pressure resistance stacking test results meet the standards?

　　Because the anti-stress stacking test results have certain equivalence, the anti-stress analysis can help us better understand.

　　 Subject to the limitations requirements of test conditions work efficiency, most manufacturers usually test the pressure resistance of cartons under normal temperature humidity conditions, directly check whether the products meet the requirements

　　Assess. In fact,

　　 There is a great risk of misjudgment in the assessment by this method, which will often mislead the assessment of the carton supplier cause losses due to collapse of the carton packaging. In the case of high humidity conditions in the south, if the pressure resistance tested in the non-standard state can meet the safety pressure resistance standard, it means that the carton fully meets the requirements, the carton design meets the requirements; if the tested carton strength is There are still two possibilities to reach the safety anti-stress standard:

　　The carton design production meet the requirements; the carton design production do meet the requirements.

It should be noted that in the case of low humidity conditions in the north, the non-standard state test results are often higher than the safety compression requirements, but it does mean that they meet the standards, because the long-distance logistics conditions, especially the shipping conditions, are relatively humid. , The test result of the non-standard state should consider this factor reflect it in the design, otherwise the risk will be unavoidable.

　　 So it is very important to correctly evaluate the results of product testing.

　　 Process basic method:

　　Determine the quality index standards for carton safety, pressure resistance tying.

　　 The above two indicators can be obtained by formulas, the determination of the indicators depends on the domestic foreign sales storage period. In special cases, such as cartons supported by contents, an appropriate anti-stress index value can be determined according to the actual situation, the quality index of the yard must be determined by a formula.

　　Detect preprocessing status:

　　The carton is pretreated under the standard test condition for 24 hours (general carton users can go to an authoritative impartial testing organization to test unconditionally) then re-test, so that the moisture of the carton reaches a dynamic equilibrium state.

　　 Precautions for sample extraction:

　　In the trial production stage of new products, the difference between the sample printing die-cutting process the non-printing die-cutting strength is about 5-20%, so the state of the sample the batch product should be kept basically the same.

　　The sampling of batch products should conform to the principle of statistical probability. After years of practical experience, the sampling samples should be selected 3 different packages, which can reduce the risk of misjudgment.

　　Result judgment:

　　 If there is a box force value lower than the anti-pressure index of the carton pressure tested under the standard state, the batch of boxes can be judged as unqualified.

　 Discussion on improving the efficiency of stacking testing: Stacking testing often takes a long time, the method of economic effective evaluation is still in the exploratory stage. The following is the experience of our company customers to discuss practice.

  Fundamental:

The safe anti-pressure value of the same box is equal to the stacking quality value, the anti-pressure min value of the sample is less than the safe anti-pressure value. By detecting the average value of the anti-pressure peaks of 6 boxes, you can determine whether the stacking test is qualified . We can intuitively understand their related relationship through the following figure.

　　 Process method:

　　 We first understand the peak deviation of the carton pressure resistance through empirical test data. Under standard atmospheric conditions:

　　 The deviation between the peak value Max the minimum value Min of the same double corrugated box under handling, transportation, storage other conditions is about 28﹪, the deviation value of a single corrugated box is about

　　33﹪. (Individual severely damaged boxes should be excluded).

      Determine the average value of standard safety resistance

　　The average value of the standard safety pressure resistance of double corrugated boxes should usually be 1.15 of the safety pressure resistance (15﹪ higher than the safety pressure resistance value), the average value of the safety resistance pressure of the single corrugated box standard safety resistance

　　 1.18 of pressure.

Detect the peak pressure resistance of 6 sample cartons under standard conditions, find the arithmetic average of the peak pressure resistance of the sample cartons. If the arithmetic mean value of the peak pressure resistance of the sample cartons is greater than the average value of the standard safe pressure resistance, then the batch of cartons is qualified, otherwise It is unqualified. Kunshan Corrugated Box Manufacturer