Cardboard pressure line process

China's packaging industry started in the 80's. So far, there are more than 20,000 carton plants. There are more than 1,400 cardboard production lines, and there are countless carton machines and post-processing carton equipment. However, the paperboard transverse pressure line (ie, carton flap indentation fold line) often appears paper folding curve is not in a straight line, the formation of the corner is not good, repeated at the crease at the bend, the cardboard pressure line is easy to break the problem. Therefore, the configuration of the crimping roller must be studied to meet the requirements of different corrugated cardboard.
First, the transverse pressure line is deeper than the longitudinal pressure line. A shaped carton should go through two processes of transverse pressure line and vertical pressure line. The longitudinal pressure line is the pressure line parallel to the cardboard corrugation, and the transverse pressure line is perpendicular to the cardboard corrugation. Pressure line. The mechanical arrangement of the transverse pressure lines is completed before the transverse cutting of the corrugated cardboard production line, that is, in the longitudinal indentation separating machine, and the longitudinal indentation line is realized in a printing slotting machine or an origami bonding machine to complete the shaping of the carton edges and corners. Shake the cover, in order to achieve the purpose of beauty, but the pressure of the transverse pressure line is stronger than the longitudinal pressure line, and the bending direction angle is larger.
Second, the pressure roller is prepared to prevent the pressure line from breaking. Through the research of a number of carton equipment manufacturers, the ideal "shan-shaped" pressure roller has been selected. When the roller of the processing pressure line is in use, it must be based on the cardboard shape. Differences cannot be confused.
In general, the three-layer cardboard press reel adopts three-point bump type, and the five-layer cardboard adopts five-point concave-convex type. But in the actual production, the type A corrugated press reel has good effect for the B type and AB type. The corrugated type AB pressure reel is also effective for the ABC tile seven-layer cardboard, while the ABC type is used for The AB type is also effective, so the pressure roller can be selected according to the shape of the corrugated board and the condition of the base paper.
Third, the pressure line rupture of several issues (1) the upper and lower pressure roller gap is too small to adjust the upper and lower pressure roller gap according to the cardboard shape and cardboard thickness to maintain a reasonable pressure strength, such as the pressure line strength is too small, although not Causes the pressure line to break, but when the carton is assembled, the box cover must be bent too much, and finally the cracking phenomenon will occur. This phenomenon mostly occurs in the cardboard made of low-grade base paper.
(2) Misalignment of the position of the assembly of the pressure roller In order to accurately install the pressure roller, usually 1 mm of the centering slot is used in the processing of the pressure reel, and not only the crack of the pressure line and the corners of the box combination will occur when the line is not properly mated. If it is not good, there will also be the phenomenon of shaking seams or gaps, causing defects in the carton. Of course, the machining defects of various machine pressure reels themselves can also cause the pressure lines to break.
(3) Secondary rolling pressure problems The horizontal creasing angles rolled by the upper and lower pressure roller are not as good as the results of the creasing and indentation. However, the productivity and economy of the two are difficult to compare. Therefore, in order to make the upper and lower pressure wheel indentation of the paperboard production line longitudinal indentation machine reach or close to the edge of the magnetic line indentation, the upper and lower pressure line wheels should be installed on the two pressure spools before and after the paperboard creasing machine respectively. The first rolling line is the pre-rolling indentation line, the corrugated cardboard structure at the indentation is changed, and after the second rolling indentation line, the first pre-pressure is slightly lower than the second rolling pressure, so that Achieve good edge.