The reason why the opening of the carton is too large after the carton is formed and the countermeasures

[Chinese Packaging Network News] Caused by the opening of the carton after the opening of the cause of a wide variety of reasons, the decisive factors mainly in two aspects: First, the reasons for the paper, including the use of web, paper moisture content, The fiber direction of the paper. Second, the technical reasons, including surface treatment, the production of templates, 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 is also correspondingly solved.

First, paper is the main factor affecting carton forming

As we all know, most of us now use roller paper, and some still import imported paper. Due to site and transport problems, it is required to cut in the country, and the paper storage time after cutting is short. In addition, in the case of some manufacturers with difficult cash flow, they are now selling and buying, so the paper after cutting is large. Some are not completely flat and there is still a tendency to curl. If you buy directly cut sheet paper, the situation is much better, at least it has a certain storage process after cutting. In addition, the water content of the paper must be distributed evenly, and at the same time it must be balanced with the surrounding temperature and humidity. Otherwise, if the time is long, deformation will occur. If the cut paper is stored for a long time and not used in time, the moisture content on the four sides is greater or less than the water content in the middle, and the paper will bend. Therefore, in the process of using cardboard, the same day that the day of cutting is used, it should not be stacked for too long, to avoid causing deformation of the paper. The opening of the carton after the opening of the carton is too large and the fiber orientation of the paper is a factor. The paper fiber arrangement has small deformation in the transverse direction and large deformation in the vertical direction. Once the opening direction of the carton is parallel to the fiber direction of the paper, the phenomenon of such opening bulging is very obvious. As the paper absorbs moisture during the printing process, after surface treatment such as upper UV varnish, polishing, lamination, etc., the paper is deformed more or less in the production process, and the tension on the surface and bottom surface of the deformed paper is inconsistent. Deformation occurs because the two sides of the carton have been glued and fixed when they are formed. When the carton is opened outwards, the opening of the opening is too large.

Second, the process operation is also the opening of the carton forming opening is too large to be ignored

1. The surface treatment of pharmaceutical packaging usually uses UV coating, laminating, polishing and other processes. Among them, glazing, laminating, polishing, etc. make the paper subjected to high temperature dehydration, the water content is significantly reduced, and then through the extension, part of the paper Fiber brittle will deform. In particular, paper jams of more than 300 g of water-based machine-coated membranes are more noticeable when the paper is stretched, and products that come out of the film tend to bend inwards, and are generally corrected artificially. Polishing product temperature should not be too high, generally controlled at 80 °C or less, after polishing usually have to place about 24 hours, until the product is fully cooled to the next process to produce, otherwise there will be a popping situation.

2, the production of die-cutting version also affects the formation of the carton, the manual version of the production is relatively poor, the specifications of the various, cutting, machete grasp is not good, the general manufacturers are basically eliminated the manual version and use laser knife die company Produced beer board. However, whether the size of the anti-lock and height line is set according to the weight of the paper, whether the specification of the cut line is applicable to all paper thicknesses, whether the depth of the die cut line is appropriate, or the like, affects the effect of the carton forming. Die-cut lines are marks that are pressed on the surface of the paper by the pressure between the stencil and the machine. If the die-cut lines are too deep, the fibers of the paper will be deformed by the pressure; if the die-cut lines are too shallow, the paper fibers will not be fully pressed. 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 expands outwards, and the phenomenon that the opening is opened and opened is too large.

3, in order to ensure a good indentation effect, in addition to the use of appropriate indentation line and high-quality steel knife, but also pay attention to the adjustment of the machine pressure, the selection of rubber strips and standard installation. General printing manufacturers are using stickers to adjust the depth of the indentation line. We know that the cardboard is generally loose in texture and insufficient in hardness. The effect of this is that the indentation lines are not very full and durable. If the imported bottom mold material can be used, the indentation lines will be more full.

4, from the imposition format to find ways to solve the paper fiber direction of the main way. Nowadays, the fiber orientation of the paper on the market is basically fixed. Most of them are oriented in the longitudinal direction. The printing of color boxes is based on a certain amount of printing on one, three, or four open pages. The general situation is Without affecting the quality of the product, a piece of paper will be the better, because it will reduce the waste of materials and reduce the cost. However, considering the material cost regardless of the fiber direction, the formed carton will reach Less than the customer's request. In general, the orientation of the paper fibers perpendicular to the opening is ideal.

If the opening of the carton is too large after the molding process, as long as we consider the content of this aspect in the production process, and try to avoid the paper and the process, the problem is very easy to solve.