The UV curing ink is attached to the paper by ultraviolet curing, and the curing time is 3 to 5 seconds. According to the particle size, the matte ink is divided into three kinds of coarse sand, medium sand and fine sand. Need to choose according to the fineness of the printed matter and customer requirements. First of all, we must ensure that the mesh size and particle size are compatible with each other. Generally, 150 to 200 mesh for coarse sand, 200 to 250 mesh for medium sand, and 300 to 400 mesh for fine sand. Secondly, in the printing process, according to the size of the ink particle size, the viscosity of the ink is correctly selected. Coarse sand is generally controlled at 2000 ± 100CPS, medium sand is controlled at 3000 ± 100CPS, fine sand is controlled at 3500 soil 100CPS, and as few ink additives as possible To ensure proper printing speed. The quality of die-cutting indentation is the main factor affecting the appearance quality of the carton. Unreasonable selection of die cutter and indentation steel wire, improper use, etc. are the main reasons for the explosion of ink layer, such as the slowness of die cutter. 1. Correct choice of die cutter Die cutters require sharpness and high hardness. The aluminized film on the surface of gold (silver) cardboard and the coarse particles of frosted ink increase the difficulty of die cutting and make the die cutter wear faster. According to statistics, the plate durability of non-gold (silver) cardboard matte prints is 800,000 times, while the plate durability of gold (silver) cardboard matte prints is significantly reduced. Different die cutters should be selected for different thicknesses of paper. Austrian BOHLER and Qingdao Sandvik G12 die-cutting blades are better. The micro-thickness of the tip of G12 die-cutting blades is controlled within 3μ1m. The sharpness and durability are very suitable for die-cutting gold (silver) cardboard. . Materials that are difficult to cut, such as PET. The height is 23.80mm, the thickness is 0.71mm, 1.07mm, 1.42mm and so on, generally 0.71mm can be selected. The high-quality indentation steel wire should have moderate hardness and strong stability, the cutter head should be smooth, the central axis of the arc should be symmetrical, the deviation of height and thickness should be small, and the specifications should be complete. The selection principle is: the thickness of the indentation steel wire is not less than the paper thickness, the height is equal to the height of the die-cutting blade minus the thickness of the die-cutting material, and then the correction value is subtracted from 0.05mm to 0.10mm. The selection principle of the indentation line is: indentation The thickness of the wire is not less than the paper thickness, and the width is equal to 1.5 times the paper thickness plus the thickness of the indented steel wire. For example: die cutting 0.40mm thick paper, the height of the die cutter is 23.80mm, and the thickness of the indentation steel wire is selected as 0.71mm, then: the height of the indentation steel wire = 23.80-0.40-0.10 (0.05 ～ 0.10) = 23.30 (mm) thickness of indentation line ≥ 0.40 (mm) width of indentation line 2 0.40x1.5 + 0.71 = 1.31 (mm) For frosted products, the height of indentation line needs to be slightly reduced on the basis of The indentation should be shallower, because too deep indentation will cause the problem of creases in the broken line. The amount of reduction is determined by the thickness of the paper, usually 0.10 ~ 0.20mm. At the same time, when the distance between the indented steel wires is too small, it is necessary to stick sponge rubber strips to play the role of anti-tension, press the paper tightly, and reduce the pressure. In addition, too thick pad paper for die-cutting plate, excessive die-cutting pressure, too thick indentation die, and narrow indentation die seam, etc., can also easily cause the problem of thread burst. Adjust accordingly when die-cutting matte prints. And in the process of die cutting, timely clean up the paper powder accumulated in the indentation die seam. Sundries, etc. 3. Reasonably control the opening point The opening point is essentially a small opening with a certain width at the cutting edge of the die-cutting knife, so that the carton and waste edges after die-cutting are not scattered, which is convenient for waste disposal. The connection point is usually opened in a hidden place that is not easy to see after the product is formed, and the position of the glue line should be avoided. If the last contact point can be seen after molding, the second contact point should be as small as possible. Otherwise, the second contact point is not easy to separate during waste disposal, causing the paper to tear and the nearby ink layer to burst. Continuous dot width; paper thickness + 0.20mm. 4. Reasonable arrangement of die cutting time The die-cutting of the matte printed gold (silver) cardboard should be done as soon as possible after printing to prevent the ink film from being over-dried to avoid bursting of the ink layer. BNF HARDWARE CO., LTD , https://www.bnfhardware.cn
2. Correct selection of indentation line and indentation steel line