In the cigarette pack In the printing industry, in order to enhance the market competitiveness, the company has successively purchased a fast and efficient roll paper circular stamping machine to complete the postpress processing. Compared with the traditional flat die-cutting machine, the round die-cutting machine can improve paper utilization and labor productivity and save business costs. The corresponding process flow has also changed a lot, from the original post-press cross-cutting to the current post-press rewinding; the original flat-press die-cutting machine completes the die-cutting process, and now the circular die-cutting machine To complete the die cutting process. However, because some companies have not used circular die-cutting machines before, so many problems have arisen in production. Now I will talk about how to use the circular die-cutting machine efficiently and reasonably.
Die cutting machine equipment selection
According to the company's product structure, the die cutting machine equipment selection. Nowadays, the domestic production technology of round die-cutting machine is very mature and stable, and many companies can manufacture without having to choose foreign products. Enterprises should pay attention to the three indicators of width, mechanical speed and working position when selecting the type.
Width
In the selection of the width must match the printing machine, hot stamping machine. Tobacco printing companies use both 650mm and 820mm standards in width. However, because the efficiency of 650mm width is too low, in recent years, the newly purchased printing machine and bronzing machine of the company have chosen 820mm width , that is, three small boxes or two boxes of cigarette packages on the printing plate. The size of the hard-packed cigarette case is 245mm long and 98mm wide; the size of the cigarette case is 375mm long and 295mm wide, and the specific size is determined by the cigarette packer.
Because the direction of paper fiber in China and Europe and the United States is inconsistent, the printing of cigarette packets can only be typeset horizontally, and vertical typesetting is not allowed. Therefore, the typesetting of small box cigarettes on the die cutter rolls is generally three horizontal and eight vertical or three vertical and ten vertical; The typesetting of the cigarette pack on the die cutter roller is generally two horizontal three or three horizontal . The principle of circular die-cutting is that the upper-axis cutting edge separates the paper on the lower-axis roller, and the thickness of the die-cutting knife roller is required to be suitable, that is, the layout of the die-cutting blade in the circumferential direction can be neither less nor more. When the small box has less than 8 stitches in the circumferential layout and less than 3 stitches in the strip box, the die cutter roll is too thin, and when the shaft end roller is pressed during use, the die cutting roller will be deformed, resulting in the middle cut; When the box is more than 10 pieces in the circumferential layout and more than 4 pieces in the box, the die cutter roll is too thick, which increases the manufacturing cost and is uneconomical.
2. Mechanical speed
In the choice of mechanical speed, generally choose 150 ~ 200m / min , this speed is the least wear on the tool and equipment, the best economic speed.
3. Work position
In the selection of the working position, three working positions (pressing and working position, indentation working position, and die cutting working position) are generally selected . If you have special products (such as embossing, etc.), you can also choose a four-position die-cutting machine.
Die cutting machine matching requirements
1. Paper matching
The round die-cutting machine uses a roll of paper and can only be produced using roll paper . Generally, the gravure printing machine is equipped with a large cross-section after printing. In order to match the requirements of the post-circular round stamping machine and the die-cutting machine, when the new gravure printing machine is purchased, the rewinding mechanism must be added. The press can be upgraded and upgraded to increase the rewinding function.
2. Matching of the unwinding mechanism
The rewinding and unwinding of the web gravure press uses a 12-inch air-expansion shaft, while the rewinding mandrel of the round-pressing hot stamping machine mostly uses a 6-inch air-expansion shaft, so the unwinding mechanism of the circular-pressure circular die-cutting machine must A 6-inch and 12-inch inflatable shaft that can be interchanged to match the core requirements of hot stamping and non-hot stamping products.
3. Matching of typesetting directions
Note that the pattern layout direction of the die-cutting knife roller must match the layout direction of the printing machine and the hot stamping machine . This is because the paper-feeding characteristics of the web paper determine that the paper rolls of the adjacent two processes are fed upward on the printing surface. The printed pattern is oriented in the opposite direction. If the pattern layout direction of the die cutter roller is not matched with the printing machine and the bronzing machine, a rewinding process is added, which will cause unnecessary economic loss to the enterprise.
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