One of the hottest corrugated box inspection serie

Corrugated box is a commonly used packaging container, which is widely used in the outer packaging of goods. It plays a protective role in the transportation, storage and handling of goods. The use characteristics of carton products require that they must meet the basic use requirements of firmness and durability. To meet such requirements, corrugated cartons must be inspected to effectively control the production process of corrugated cartons. The appearance inspection of corrugated boxes is carried out according to corrugated boxes (GB/t6543-1986). The standard is very strict for each inspection item. From the daily appearance inspection results of corrugated boxes, the items with more problems include internal size, pattern, head and tail nail distance, cutting knife edge, etc. In the whole appearance inspection, each item is interrelated. If there is a problem in one item, it will affect the total length of the resistance strain gauge it adopts, its appearance items, and even affect the physical properties and the results of stacking and falling. For example, if the indentation line of the corrugated box is not clear or broken, its height will change after the box is formed; Let's simply explain that if the knife edge is incorrect, it will lead to loopholes in the box corner or convex corners and uneven box pieces after forming, and the folding resistance of the swing cover is not up to the standard; Poor combination will directly affect the shear difference of box pieces; The quality of the nail box directly affects the overlapping strength of the corrugated box. The unreasonable nail distance and the head and tail nails directly affect the overall compression resistance and stacking effect of the box. Improper glue mounting will lead to the unqualified physical performance items such as the oblique edge of the box board, bonding strength and puncture strength; If the inner diameter size is incorrect, the goods will not get normal protection (especially in the drop and stacking tests), or the whole batch of boxes will not be used, which will affect the normal use of goods. This is a chain reaction problem, and it is also a problem of the relationship between local and overall. The quality of corrugated boxes is related to the safety and protection of packaged goods. They cannot be damaged in the whole process of storage, transportation and sales, so as to realize the value of goods. As a packaging product with low technical content, the quality control link of corrugated box is very weak. Some carton manufacturers simply do not know how to check the quality of corrugated boxes in the production process. Therefore, it is of great significance to correctly understand and understand the inspection items and methods of corrugated boxes. The following describes the appearance inspection of corrugated boxes

1. The inner dimension stretches the corrugated box to form, and the included angle of the adjacent surface is at right angles on the right angle guide. Is it right that the adjacent surface of one corner of the fixed box joint is close to the right angle guide, and its included angle is at right angles. Measure the length, width and height in turn, as shown in Figure 1 and figure

2. The specific method is as follows: length: at the upper end of the long side of the carton, measure the distance between the carton walls from the first nail and the second nail on the lap tongue to the opposite wall with an inner diameter ruler, and measure the distance between the two walls at the corresponding position at the lower end of the long side of the carton. If the length of any side does not meet the requirements of national standards, it will be judged as unqualified. Width: measure the distance between the two box walls with an inner diameter ruler at the upper end of one side of the corrugated box width direction (the size of the short side of the box bottom area), that is, the lower end of the other side. If the width of either side does not meet the national standard, it will be judged as unqualified. Figure 1 Height: open the outer swing cover of the carton, only bend the inner swing cover on one side, and clamp it with a right angle guide. Measure the distance between the bottom of the carton and the inside of the two inner swing covers on the top with the inner diameter, that is, the height of the carton. Take the two inner swing covers at the bottom of the box as the base point, and measure the height of the box on different long surfaces. If the distance between the two inner swing covers on any same side does not meet the national standard, the height is judged to be unqualified. (Note: the so-called non-compliance with national standards refers to the dimensional deviation of various corrugated boxes that do not comply with the provisions of Table 3 of gb6543-86 corrugated boxes). Figure 2 divides corrugated boxes into eight types according to the maximum internal comprehensive size, the maximum mass of the contents and the types of corrugated boards used. Maximum weight (kg) maximum comprehensive size (mm) single corrugated box type 1 type 2 type 3 type 4 type 10 double corrugated box type 1 type 2 type 3 type 4 type 20 and COPV flight test also helps to make the technology more mature size box type large, medium and small length, width, height single limit deviation mm+5 -3+4 -3+3 -2 note: large, medium and small internal comprehensive sizes are respectively; Greater than or equal to 2000mm, less than 2000mm and greater than 1000mm, less than or equal to 1000mm. Special attention should be paid when measuring the internal dimension. During the inspection, the straight line led out by the inner diameter ruler should be perpendicular to the surface of another box. The right angle guide gauge can be adhered to the inner swing cover or the outer wall of the carton at 90 °. When testing, use appropriate force, generally make the inner diameter ruler contact the box wall and inner swing cover. 2. Closure standard: the separation or overlap of the outer swing cover shall not be greater than 3mm. Close the inner and outer swing covers on the top of the carton, and measure the gap or overlap size between the two outer swing covers from the middle of the carton with a steel ruler (steel tape), as shown in Figure 3. The top and bottom are measured once respectively, and if any part fails to meet the standard, it is judged as unqualified. Some cartons (such as vegetables, fruit boxes, etc.) require that there is a certain gap in the outer swing cover, so it should be measured according to the required size. Figure 33. Squareness standard: the sum of the maximum comprehensive dimensions (internal dimensions) of the box is less than or equal to 1000mm, the difference between the two diagonals on the top shall not be greater than 5mm, the sum of the maximum comprehensive dimensions is greater than 1000mm, less than or equal to 2000mm, and the difference shall not be greater than 8mm; The maximum comprehensive size is greater than 2000mm, and the difference shall not be greater than 12mm. Close the flap on the top of the carton and support the carton into shape. One corner of the carton is at a right angle. Measure the length of the diagonal with a steel ruler (steel tape), and record the length difference between the two diagonal lines. If it exceeds the above standards, it is judged that the squareness is unqualified. See Figure 4. Figure 44. Corner loophole standard: there are no loopholes at the four corners of the box, and the diameter of each corner of the loophole after being packed is not more than 5mm; No obvious wrap angle is allowed. Corner looping: after the carton is supported and shaped so that its adjacent surfaces are at right angles, use a steel ruler (steel tape) to visually detect it. If the largest corner looping does not meet the standard, or there is an obvious corner looping in any corner, it is judged as unqualified. 5. Cutting edge standard: the cutting edge is smooth and clean without obvious burr, and the crack width of the cutting surface is not more than 8mm. For the depth of incision, the flat incision accounted for 1/2 of the indentation line, and the sharp incision accounted for 71.9%; 2/3 of the equipment indentation line with a stroke of 701 ~ 1000mm. By visual inspection, the knife edge should be clean and the depth of the incision should meet the requirements. If there is obvious burr at any place or the depth of the incision exceeds the specification, the knife edge is judged to be unqualified. Crack width: the parallel distance between the extreme end of the fracture extension of the cutting edge or notch and the edge of the cutting edge. If any part exceeds the national standard, the crack width is unqualified. If there are only processing wrinkles at the knife edge and they are not broken, they should not be judged as cracks. If necessary, measure with a steel ruler (steel tape) with an accuracy of 1mm. 6. Indentation line standard: indentation line width, single corrugated box not more than 12mm, double corrugated box not more than 17mm, folded line in the middle, no unilateral line. There shall be no breakage. No extra indentation line is allowed on the box wall