Acceptance of the hottest carton quality

2022-09-23
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Acceptance of carton quality

according to the different use channels of cartons, cartons are mainly divided into domestic and export cartons. As the name suggests, export cartons are used to transport export goods, and domestic cartons are used to transport domestic circulation goods, and different inspection requirements are formulated for the two categories

gb/t6544 "corrugated board for packaging materials" GB/t6543 "corrugated box"

GB/t5034 "corrugated board for export product packaging" GB/t5033{corrugated box for export product packaging "GB/tl91" Pictorial marking of packaging storage and transportation "

gbl90" marking of packaging of dangerous goods ", etc.

specific determination method

GB/t6548" method for determination of adhesive strength of corrugated board "

GB/t6546 "Corrugated board edge pressure strength determination method"

GB/t4857.4 "Basic test pressure test method for transport packaging"

GB/t4857.3 "Basic test stacking test method for transport packaging cement pressure testing machine to pay attention to details when using"

GB/t4857.5 "Basic test vertical impact drop test method for transport packaging"

there are also standards formulated according to the shipment of different commodities, For example, GB/t4856 "packaging of knitted and cotton fabrics", etc. There are also many industry standards involved, among which Sn/t0262 "rules for the inspection of corrugated boxes for the transportation and packaging of export commodities" of the entry-exit inspection and Quarantine of the people's Republic of China is used more, and IS0 standard is used more

carton acceptance method

cartons nailed by flat wires require that the flat wires are free of rust, peeling, cracking or other defects in use

the box is square, and the surface is not allowed to have obvious damage and stains

the printed drawings on the box surface are clear, the depth is consistent, and the position is accurate. The name or code of the carton manufacturer must be printed on the box cover

the width of the overlapping tongue of the carton joint nailing is 35mm ~ 50mm. The metal nails should be in the middle of the overlapping tongue, and the diagonal nails (450) or horizontal nails should be used. The box nails should be arranged neatly and evenly. The distance between the single row of nails is 80mm, and the distance between the head and tail nails and the edge line of the indentation line is 20mm0. There should be no overlapping nails, warped nails, no corners, etc

carton joint bonding lap tongue is 30mm wide, and the adhesive is evenly coated

width of carton indentation line: single corrugated carton 12mm, double corrugated carton 17mm, so that after the flap is folded, the fold line is in the middle without cracking

the carton flap also realizes the light weight of the product. After opening and closing 180, fold it back and forth for more than 5 times. There shall be no cracking on the surface paper and inner paper of category 1 and 2, and there shall be no cracking on the surface paper of Category 3. The total cracking of the inner paper is 70mm

gb/t5033 is slightly different from gb/t6543 in appearance inspection: the process is more advanced, the nail distance of double nail box is 75mm, and the nail distance of single nail box is 55mm

sn/t0262 standard, more requirements are: no splicing, lack of materials, exposed ridges, wrinkles, and glue penetration of the paper on the surface of the carton. The lining paper shall not be spliced more than twice. The seam is 30mm away from the indentation line, and the degumming area is 20cm per square meter. The flap of the carton is opened and closed 2700 and folded back and forth for 3 times. The paper and lining paper shall not be cracked

physical property test of corrugated boxes

before the physical property test of corrugated boxes, the boxes should be pretreated in an environment with a temperature of 23.2 ℃ and a relative humidity of 50% to 5% for 24 hours, and tested under these conditions (except for moisture content)

moisture content

in the standard, the moisture content refers to the moisture content of the corrugated board 30 ~ 60 minutes after leaving the machine. The standard range is slightly different due to different standards, which must be determined before inspection

thickness (GB/T corrugated board thickness measurement method)

refers to the measurement distance between two parallel planes of the thickness gauge of the corrugated board sample under the specified pressure

puncture test (GB/t2679. Determination of puncture strength of paperboard)

refers to the work required to pass a certain shape of pyramid through the paperboard. It simulates the situation that the carton is suddenly damaged by a hard object during transportation

bursting test at the end of the experiment (GB/T method for determination of bursting strength of corrugated board)

refers to the uniformly increased large pressure value perpendicular to the surface of the sample that the corrugated board can bear on the unit area under the test conditions

edge pressure test (GB/T corrugated board edge pressure strength determination method)

detect the pressure that the corrugated board can withstand per unit length

adhesion test (also known as peel test) (gb/t method for determination of adhesion and strength of corrugated board)

is an index reflecting the adhesion and fastness between layers of corrugated board

empty box compression test

check the pressure that the carton itself can withstand. First, according to the calculation formula:

p=k g (H/h-1) x9.8, where

p: compressive strength value, n:k: deterioration coefficient,

g: gross weight of a single carton, kg; H: Stacking height, m (3m); h: Height of a single carton, m; H/h: be sure to take an integer, less than one is calculated by one. Deterioration coefficient K: the comprehensive size of the large inner diameter refers to the sum of the length, width and height of the carton. When the quality of the interior is not the same as the comprehensive size of the interior, it should be subject to the standard of one higher level. As long as one test item is unqualified, this batch of cartons is unqualified. The main items of the transportation performance test are:

drop test

pack the cartons according to the shipping status, (quantity: 3) determine the drop height according to the carton weight and transportation mode. If a carton falls to an angle and the three sides and three edges constituting the angle are damaged, and the contents are leaked, it is unqualified

in the stacking test, the cartons are packed according to the shipping status, and a certain load (3 in number) is stacked on them

load according to the formula:

m= (H/h-1) g

where: m -- the stacking weight applied on the carton, KGH -- 3M h -- the height of the carton, m

g -- the gross weight of the carton of the loaded goods, kg stacking time is 24 hours, and the carton is qualified if it does not collapse and damage

other test methods include vibration, impact, etc. In addition to the above testing items, there is another important trend, that is, the testing of heavy metals, especially the packaging and products exported to the EU, should be carried out to detect the content of mercury, lead, chromium, arsenic, cadmium and other elements. For example, cartons for dangerous goods, such as paint and perfume, belong to this category. The United Nations has a proposal on the transportation of dangerous goods. Our country's cartons for transporting dangerous goods are tested according to this requirement. The strength of the test is determined according to the danger of the contents in the carton. The main test items are falling and stacking. Since China joined WT0, more and more attention has been paid to food packaging, and the main testing items are coliform, pathogenic bacteria, heavy metal content, etc

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