The corrugated box shows red light to the flap

Folding cover folding degree is one of the important quality indicators of corrugated boxes. How do you look at the shaking cover problem? China's corrugated cardboard box standard GB6543-86 expressly states that: Corrugated box flaps are opened and closed 180° more than 5 times, types 1 and 2 have no cracks in the top and bottom layers, and there is no crack in the outer layer of type 3 boxboards. The total length of cracks in the layer shall not exceed 70mm, and additional provisions shall be made: from the selection of samples to take 6 cartons for inspection, if two of them do not meet the above requirements, the batch of cartons shall all fail. However, in actual use, some customers' requirements are even more stringent. They require that the flaps should not be cracked when they are folded 180 degrees outward (rather than 180 degrees). Can achieve this, to achieve this important technical quality indicators, the difficulty is controlled as follows:
1, the quality control of the base paper to use a good texture of the surface paper and paper, paper grade to be above the C level, the test does not crack, good folding degree. In addition, high-strength corrugated base paper should also be used in core paper to avoid the use of rough, low-grade base paper for corrugated paper. This type of corrugated paper may cause top paper to burst during shake analysis.
2. Control of moisture content of base paper and paperboard Paper and paperboard are too dry to cause an important reason for cracking of flaps. The national standards GB13023-91 and GB13024-91 stipulate that the water content of the corrugated paper and linerboard is 8% to 10% respectively. In the actual application, of course, it must be properly controlled according to the grade and equipment of the paper. When the grade of the paper is high, the moisture content can be lower, and when the grade is low, the moisture can be higher. The moisture content of corrugated board, the national standard GB6544-86 provides 14%, which should be the moisture content of the board when it is off. The moisture content of corrugated board has a direct relationship with the moisture content of the base paper. At the same time, it can be properly controlled by the heating amount (steam pressure) and the vehicle speed of the double-sided paper.
3. Indentation control of the flap and fold line The first indentation must be pressed through. The so-called press-through is to press without gaps. For example, the thickness of the five-layer cardboard indentation is generally about 2mm, not only the top of the cam should be pressed through. Both sides must be crushed. such. When the flap is folded outwards to the bottom, a flat surface is formed outside the fold line so that cracks do not occur. In addition, the condition of the indentation depends on the state of the slitter press roll. The technical state of the pinch roller is also different depending on the number of layers in the production board (different in the third, fifth and seventh layers). The clearance (convex and concave wheel) of the pinch roller must be consistent, otherwise it cannot guarantee that all the board indentations can be Just right, the lightly pressed flap may have cracks when it is folded, and heavy pressure may cause the pressure lines to break.
4. After the cardboard is separated from the machine shortly afterwards, manually folding the flaps to both sides of the flap once or twice (folding in the end) can greatly improve the folding endurance of the flaps, which can make the flaps of the cartons prolonged without cracking.
As the main force of China's carton enterprises, small and medium-sized carton companies, whether they can make overall plans for the specific operations, are they all? We may wish to look at their current situation because small and medium-sized carton companies have a poor foundation, low capital and technical inputs, low production skills of workers, low manual production, high costs, low quality, obsolete products, and their technical content. The level of craftsmanship and product performance cannot be effectively guaranteed. In the face of fierce market competition, they are only actively working hard to fill their stomachs. Do small-medium carton companies do not want to solve these problems? However, the subjective and objective factors have in some sense curbed their pursuit in this area. Therefore, it is not surprising that carton enterprises have experienced cracks in the folding cover. Is the carton user allowed to leave it? The answer is of course negative. As a dark horse in the carton industry, the HL patent carton may give me a little new insight.
HL patented carton without the concept of shaking, of course, there are no problems caused by shaking cover. It takes the thin shell structure theory and material mechanics as the scientific basis, inherits the traditional manufacturing technology and reasonable indentation process, and uses folding deformation to bond into Enhanced box cover, bottom of the new process and new unique structural design, will be creative will be planed corrugated cardboard shape, layered adhesive closed, plug board sealed into a box, no need to slot, cut corners, touch line , binding, to overcome the traditional carton due to slotting, cutting corners, binding caused by the weak point of strength. At the same time, HL patent carton has a unique anti-counterfeiting, moisture-proof and dust-proof function. It is all green packaging, and the production technology is simple and easy to operate. As the carton's comprehensive dimensions look at the HL patented cartons, the author has fallen into deep contemplation. As the corrugated boxes supporting the Chaoyang industry, along with the sustained, stable, and healthy development of China's national economy, do we only show red lights to the rocker cover? ? HL carton gave us a brand-new answer, at the same time also inject new hope, hope the rise of the new generation can fuel the carton industry in the spring, flowers blossoming, is that not better? (Li Qinglin)