Color box process: the cause and solution of the seam paper box

There are many reasons why the opening of the carton box is too large after forming mailer shipping box. The decisive factors are mainly in two aspects: 1. The reasons on the paper, including the use of roll paper, the moisture content of the paper, and the fiber direction of the paper. Second, the technical reasons, including the surface treatment, the production of the template, the depth of the indentation line and the imposition format. If these two major problems can be solved well, then the problem of carton forming will be solved accordingly.

1. Paper and paper are the main factors in the formation of shadow boxes

As we all know, most of them use roll paper now, and some of them are imported roll paper. Due to the problems of site and transportation, it is required to slitting in the country, and the storage time of the slitting paper is short. In addition, when some manufacturers have difficulty in capital turnover, they are sold and bought immediately, so the slit paper is large. None of the sections are perfectly flat and still have a tendency to curl. If you buy the cut sheet paper directly, the situation is much better, at least it has a certain storage process after cutting. In addition, the moisture contained in the paper must be evenly distributed, and at the same time must be in balance with the surrounding temperature and humidity, otherwise, deformation will occur after a long time. If the cut paper is stacked for too long and not used in time, the water content of the four sides is greater or less than that of the middle, and the paper will bend. Therefore, in the process of using jammed paper, it should not be stacked for too long to avoid deformation of the paper. After the carton is formed, the opening is too large and there are factors such as the fiber direction of the paper. The paper fibers are arranged with little deformation in the direction of horizontal grains and large deformation in the direction of vertical grains. Once the opening direction of the carton is parallel to the fiber direction of the paper, the phenomenon of opening bulging is very obvious. Since the paper absorbs water during the printing process, after surface treatment such as UV varnish, polishing, and coating, the paper will be more or less deformed during the production process. The tension of the deformed paper surface and bottom surface is inconsistent. Once the paper Deformation occurs, because the two sides of the carton have been glued and fixed when it is formed, only if it is opened outwards, the opening will open too much after forming.chocolate box

Second, the process operation is also a non-negligible factor for the opening of the color box forming opening to be too large

1. The surface treatment of pharmaceutical packaging usually adopts processes such as UV glazing, lamination, and polishing. Among them, glazing, lamination, and polishing make the paper go through high-temperature dehydration, and the water content is significantly reduced. Fibers are brittle and deform. Especially for cardboard with a water-based machine-coated film of more than 300g, the stretching of the paper is more obvious, and the laminated product has a phenomenon of inward bending, which generally needs to be corrected artificially. The temperature of the polished product should not be too high, generally controlled below 80°C. After polishing, it usually needs to be placed for about 24 hours, and the next process can only be carried out after the product is fully cooled, otherwise the wire burst will occur.

2. The production technology of the die-cutting plate also affects the forming of the carton. The production of the hand-made plate is relatively poor, and the specifications, cutting, and machetes are not well grasped. Generally, manufacturers basically eliminate the hand-made plate and use laser cutting die companies. crafted beer boards. However, whether the size of anti-lock and high-low line is set according to the weight of the paper, whether the specification of the knife line is suitable for all paper thicknesses, whether the depth of the die-cutting line is appropriate, etc. all affect the effect of carton forming. The die-cut line is the trace that is pressed on the surface of the paper by the pressure between the template and the machine. If the die-cut line is too deep, the fibers of the paper will be deformed due to the pressure; if the die-cut line is too shallow, the paper fibers will not be completely penetrated. Due to the elasticity of the paper itself, when the two sides of the carton are formed and folded back, the incision at the edge of the opening will expand outwards, resulting in the phenomenon that the opening is too wide.candle box

3. In order to ensure a good indentation effect, in addition to selecting a suitable indentation line and high-quality steel knife, attention should also be paid to the adjustment of machine pressure, the selection of rubber strips and the standardized installation. Generally, printing manufacturers use the form of sticker boards to adjust the depth of the creasing line. We know that cardboard is generally loose in texture and not hard enough, so the result is that the indentation line is not too full and durable. If imported bottom mold materials can be used, the indentation line will be fuller.

4. Finding a way from the imposition format is the main way to solve the paper fiber direction. Nowadays, the fiber direction of the paper on the market is basically fixed, most of them take the longitudinal direction as the fiber direction, and the printing of the color box is to print a certain amount on a folio, three-fold or four-fold paper. The general situation is On the premise of not affecting the product quality, the more pieces of paper you put together, the better, because this can reduce the waste of materials and thus reduce the cost. However, if you blindly consider the material cost and ignore the fiber direction, the formed carton will reach Less than the customer’s request. In general, it is ideal that the fiber direction of the paper is perpendicular to the direction of the opening.

To sum up, as long as we pay attention to the content of this aspect during the production process and try to avoid it from the aspects of paper and technology, the problem can be easily solved.