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1. Quality control of base paper:
To use a good texture of surface paper and paper, the grade of the paper should be above grade C. After testing, no cracking, good folding resistance. 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. Water content control of base paper and board:
Too dry paper and paperboard is an important cause of cracks in flaps. The national standards GB3023-91 and GB13024-91 stipulate that the moisture content of corrugated medium and cardboard should be about 8%-10% respectively. According to the paper's paper and equipment conditions properly controlled. When the grade of the paper is high, the moisture content can be lower; 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 flap folding line:
First of all, the indentation must be pressed through, the so-called pressure through, is to press without gaps, such as the thickness of the five-paper board indentation is generally about 2mm, not only the top of the cam to be pressed through, and it must be pressed on both sides. In this way, 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 presser. The technical state of the pinch roller is different depending on the number of layers of 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 is not possible to protect all paperboard indentations properly. When the flaps are lightly folded, the fold lines may have cracks, and the heavy pressure may cause the pressure lines to break.
4. Folding:
Shortly after the board is removed from the machine, manually folding the flaps on both sides of the flap once or twice (folding in the end) can greatly increase the folding endurance of the flaps and allow the flaps of the cartons to last longer without cracking.
As the main force of China's carton enterprises - small and medium-sized carton companies, can the overall arrangements in the specific operation process, all face it? We may wish to look at their current situation: due to the poor foundation of small and medium-sized carton enterprises, insufficient investment in capital, equipment, and technology, 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 and medium-sized carton companies do not want to solve these problems? However, subjective and objective factors have in some sense curbed their pursuit in this area. Therefore, the cracking of the flaps has become a problem that has not become a problem, and it is not surprising for carton companies. Is the carton user allowed to leave it? The answer is of course negative. Perhaps as a dark horse in the carton industry, the HL patent carton can bring us a little new inspiration.
Since the HL patented carton has no flaps, it certainly should not have many problems caused by the flap. It takes the thin shell structure theory and material mechanics as the scientific basis, inherits the traditional indentation technology of reasonable manufacturing techniques, and uses the folding deformation bonding to enhance The box cover, the bottom of the new process and the unique and unique structure design, creatively plan the corrugated cardboard into a ladder-shaped layered adhesive closed board sealed into a box, no need to slot, cut corners, touch line, binding, Overcome the weak points of strength caused by slotting, cutting corners, and binding in traditional carton boxes. At the same time, the HL patent carton has the functions of anti-counterfeiting, moisture-proof and dust-proofing. It is fully green packaged and has simple production technology and convenient operation. Looking at the HL patent carton in the comprehensive dimensions of the carton, the author was deeply immersed in deep thought. As a corrugated carton supporting the Chaoyang industry, along with the sustained, steady, and healthy development of China's national economy, do we only show red lights to the rocker? HL carton gave us a brand-new answer, but also injected new hope, hope the rise of the new generation can bring the carton industry in the spring, flowers are blooming, so not better?
(From "China Packaging News" March 29 author Li Qinglin)
Rolling cover folding resistance is one of the important quality indicators of corrugated boxes. How do you look at the swing cover problem? China's corrugated cardboard box standard GB6543-86 expressly states that: Corrugated box flaps are opened and closed by 180° more than 5 times. Types 1 and 2 are not allowed to have cracks in the surface layer and the inner layer. The total length of cracks in the inner layer must not exceed 70mm, and additional Provisions: If any of the six cartons are selected for inspection from the selected sample and two of them do not meet the above requirements, the batch of cartons are all unqualified. However, in actual use, some customers' requirements are even more stringent. They require that the flaps should be folded 180 degrees outwards (rather than 180 degrees). Can achieve this, to achieve this important technical quality indicators, the difficulty is controlled as follows: