Characteristics of printing slotting process
Slotting process will bring the field of product packaging into a new starting point, now many goods are using the slotting process, not only the appearance is exquisite, but also easy to use, simple, more in line with the needs of the public, what are the characteristics of the slotting process, so that many people for the side of it? There are three common geometries of V-shaped groove, L-shaped groove and U-shaped groove. According to the effect of the product, the jam paper generally adopts a V-shaped groove, and the folding angle is generally set to 95° (where 5° is the correction magnification value, in order to eliminate the rebound force after the jam is folded). When the face paper is folded to 90°, the two slotted bevels are just superimposed, the inner line and the outer flute line are very beautiful, the line leaks less color, and the flute angle is distinct. However, for some special structure of the box type, the folding angle will sometimes be greater or less than 90 °, at this time it is necessary to determine the angle of the V-shaped groove by calculation, and the empirical formula is: Slotting angle = (180-a)°/2 5° wherein, a is the folding angle required by the product; 5° is the correction magnification value. The grooving process is to forcibly remove the paper fibers on the surface of the cardboard, which will cause the remaining fibers at the bottom of the groove to be very thin, and it is easy to burst the thread when folded. Therefore, it is necessary to coat one side of the cardboard or cardboard to enhance the toughness of the cardboard or cardboard, and then groove the reverse side. In addition, the depth of slotting is also very important, if the groove line is too deep, the cardboard or cardboard is prone to open and burst the line, and if it is too shallow, it will make the corrugated line appear wavy, resulting in uneven folding and affecting the forming effect of the carton. Therefore, the grooving depth needs to be determined according to the weight of the jam or cardboard, or expressed in terms of residual thickness. Under normal circumstances, the residual thickness of cardboard with a quantitative amount of 200~450g/m2 is 0.14±0.20mm, and the residual thickness of cardboard with a quantitative amount greater than 450g/m2 is 0.20±0.20mm. Types and selection of slotting equipment At present, there are two kinds of commonly used slotting equipment: drum slotting machine and plane slotting machine. When choosing equipment, printing enterprises must make reasonable decisions based on the material and structural characteristics of the product. The drum slotting machine adopts a new paper feeding unit, which wraps all the cardboard or cardboard that needs to be slotted on the cylinder surface with a diameter of 60cm, which can ensure that the cardboard or cardboard moves accurately when slotting, and does not deviate, and has the characteristics of high precision and high speed, and is more suitable for the grooving processing of thin cardboard or cardboard with a quantitative amount of 450g/m2 or less. The planar grooving machine is similar to the traditional flat-facing die-cutting machine. It works by fixing the cardboard or cardboard that needs to be grooved on a flat surface, and then using a tool to groove along the designed groove line. Since the paper should not be bent and deformed during the slotting process, the flat slotting machine is more suitable for the slotting processing of thick cardboard or cardboard with a quantitative quantity of more than 450g/m2, such as double gray board, MDF and other rigid cardboard commonly used in wine packaging.