Die-cutting is an important process in the production process of the card book that relates to the production quality and production efficiency. Because the card book has special requirements for the process in the die-cutting process, and there are different factors that affect the quality of the card book in the production process, it is necessary to strictly follow the technical requirements of the die-cutting process to avoid quality problems.
The die-cutting process of the card book: making a die-cutting plate or a die-on-a-plate-setting machine pressure-adjusting rules-sticking a sponge rubber strip-testing die-cutting-adjusting pressure—formally die-cutting-clearing. This is a relatively standard die-cutting process, but judging from the die-cut products, some products have burrs and paper dust. The trace line is weak, and there are some cases of line explosion.
The paper used for card books is special. Some papers have long fibers and generally do not show burrs and dust. There is also a considerable amount of whiteboard paper or gray-backed whiteboard paper with short fibers and low density. The dust is serious and the dust after die cutting Many, not only burrs but also laborious. In view of this situation, you should choose a good quality die cutter or a special-shaped mold with good rigidity. However, the accuracy and sharpness of general die cutters can not fully meet the requirements. Some die-cutting knives, when observing the blade with a magnifying glass, will find that there are many flaws. The blade is not straight and smooth, which is one of the reasons for the generation of paper dust and burrs. The die-cutting blades of some manufacturers are very sharp on the surface, but they have poor rigidity. If the blades are used for a short time, they will be worn out, which will cause dust and burrs at the die-cutting and window openings of the paper edge or inner page. Good die-cutting knives are not necessarily high in price. You can compare die-cutting knives of different brands, select the appropriate brand, and fix it for targeted use. A good die cutter or die can reduce the friction between the knife and the paper, make the product smooth and dust-free, and reduce the wear on the machinery and equipment.
After the die-cutting plate is put on the machine, it is necessary to crimp the attached base die paper (back knife paper) to determine the exact position of the groove line on the base die plate. But often due to improper operation or excessive pressure, the blade and the steel base plate collide too sharply, directly hitting the blade of the die cutter. The continuous large pressure after the official production is also the main reason for the damage to the blade. If the die cutter is not noticed or replaced in time, it may cause paper dust and burrs to varying degrees.
Therefore, after the die-cutting plate is put on the machine, it is necessary to identify where to cut through and where to make the indentation according to the card book page. The pressure must be light when debugging, and there is a clear mark line on the bottom die paper. Carry out the adjustment after engraving the groove, and set a pressure value during the adjustment. Pad paper under the steel plate and observe whether the waste paper or printed matter at the knife edge is easy to separate after pressure test. Remove the pressure, and do some paper padding on the uncut parts, so that the pressure of the die cutters on the layout is uniform, and then gradually increase the pressure of the machine. The ideal pressure is that when the waste edge of each cut is just separated, the pressure of the machine is the smallest and the pressure is appropriate. The edges are smooth and lint-free. It is easy to separate, and the die cutter is not easy to wear. When the automatic die-cutting machine starts to adjust the pressure, the substrate material is used to fill in according to different positions, and then the pressure is locked to formally die-cut, so that the molded product has a molding effect, and the production speed is fast and the efficiency is high.
The page graphics of the three-dimensional card book need die cutting and indentation. Before the die cutting, the bottom template must be engraved. The groove line on the bottom template is directly or badly engraved, which directly affects the stretching effect of the three-dimensional graphics. If the carved groove lines have different widths, are not straight, or have gaps, or the die cutter, the indentation line cannot accurately match the bottom groove line, and the liner pad is not suitable, etc., it can cause the indentation to shift and Die cutting cannot be cut off completely. During die cutting, before the die cutter has cut through the edges or graphics, the paper may be fluffed because it is squeezed and displaced. Generally, the thickness of the base die paper is less than or equal to the thickness of the die-cut paper. The hand-carved groove line puts forward higher requirements for the operator's proficiency, skills and experience. A skilled operator should understand that the indentation effect will be different depending on the arrangement direction of the indentation lines and the direction of the paper fibers. The graphic die cutting lines and the indentation lines in the pages of the three-dimensional card book are parallel to the book and vertical . In die cutting, the trace lines parallel to the direction of the paper thread tend to be weak after folding, and flatten slightly flat; and the trace lines perpendicular to the direction of the paper thread are full and powerful after folding. For the die-cutting of graphics, the parallel strands are easier to separate, and perpendicular to the strands, there are often strands of fibers. Therefore, when adjusting the groove liner pad, the indentation line groove in the straight grain direction is preferably narrower. In this way, the edges of the die-cut products are separated and smooth, and the traces are strong and concave.
Improper selection and installation of the rebound sponge strip is also one of the reasons that affect the quality of die cutting, because the sponge strip should have sufficient hardness to compress the paper, allowing the die cutter / frame to cut the paper smoothly, different The paper should use sponge rubber strips of different hardness, and the installation position and height should also be scientific. Standard material selection and installation are the fundamental methods to improve the quality of die cutting. Due to the irregular change of the graphics of the three-dimensional card book and the change of the distance between the die-cut edges, some of the spacing is very small, and it has a special layout, which brings some difficulties to the selection of the hardness and correct use of the sponge rubber strip. The correct selection and installation are as follows .
1. Selection of hardness of rebound sponge strip
(1) If the distance between the die-cutting blades is <10mm, the hardness of the sponge rubber strip should be around HS60; if it is> 10mm, it should be HS20-HS35.
(2) If the distance between the die-cutting knife and the steel wire is <10mm, the arched sponge rubber strip should be selected, and the hardness should be HS55; if> 10mm, the sponge rubber strip with the hardness of HS35 should be selected.
2. Installation of rebound sponge tape
(1) The sponge rubber strip should be at least 1-2mm away from the die cutter, and cannot be installed close to the blade body, otherwise the sponge rubber strip cannot expand in the direction of the blade body after being compressed, and can only expand in the other direction, causing paper to be pulled to both sides. The die cutter can also cut the paper in the future. The paper has been pulled off by the sponge strip, which will cause the edges of the graphics to be unsmooth, and even deform or tear the paper, making the die cut pages uneven.
(2) The sponge rubber strip should be about 1.5mm higher than the blade edge, and appropriate adjustments should be made according to different hardness. Generally speaking, the softer the sponge rubber strip, the higher the height. The number, hardness, and height of the sponge rubber strips on the entire die-cutting plate should be evenly distributed at the corresponding positions, and the sponge rubber strips should also be arranged on both sides of the balancing knife.
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