The most popular way is to use dotted line cutting

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Use the dotted line cutting method to improve the cutting quality

in the traditional paper collision table, the tail line of the printed sheet is usually a vertical line, but sometimes the printed sheet is irregular serrated, and it is very accurate to observe the front and back lines of the printed sheet. How can it be cut to the specified line? Through the careful observation and study of the cutting process and equipment used, as well as the printing machine, we found a law: all prints that deviate from the vertical line (the stack of prints after the collision should be the vertical line formed by the combination of tail lines) are skewed and uneven prints. To be exact, all prints that are not at right angles deviate from the vertical line. So how to solve and deal with it? We draw the following conclusions from many aspects of discussion and analysis:

(1) to fundamentally solve the problem, we need to make the cut paper 90 °

(2) the solution of the cutting method for the finished printing sheet, that is, "dotted line cutting method"

to explore this method, we must first understand the paper feeding mechanism of the printing machine. The paper feeding mechanism of the printing machine is that Feida transports the paper to the paper feeding table, then sends the paper to the front stop gauge through the belt drive, and then pulls the paper sheet to the specified position through the side gauge. The paper sent to the cardboard can be handed over to the teeth only after two actions: the first action is the longitudinal movement, which is the action of forward movement at this time; The second action is the horizontal action, which is the action of pulling the gauge. It is observed that if the paper sent to the front stop gauge is less than 90 ° near the side of the pull gauge, its corner tip will exceed the pull gauge; For paper larger than 90 ° (on the side of the pull gauge), the tail side will also exceed the pull gauge. Once the crux is found, there is a solution, but we can't help taking cooling measures. The paper feeding positioning of printing is composed of points and lines. The points are determined by the pull gauge bearing, and the lines are formed by the front stop gauge. Through the understanding of the printing machine, in order to cut out more accurate finished products, we decided to transform the paper collider. Transform the paper bumping table into a dotted line structure

specific method: add a board about 100mm wide, 20mm thick and about 20mm long higher than the height of the side plate of the original paper impact table on the original paper impact table, and put it in the position of the pull gauge. With this method of page bumping, the printed sheets are very in place, and the bumped sheets also meet the requirements of cutting. However, the cutting method did not change, and it still could not meet the ideal requirements, so the cutting device was added. Specific method: fix it on the paper pusher with a board of the same specification. Through measurement and practice, nest it into a horseshoe shape with double strand No. 8 iron wire at the place 110 ~ 120mm away from the side of the paper pusher (the pull gauge position of the printing machine). One end is stuck on the board and the other end is stuck behind the paper pusher. The cutting thickness of each stack should be 70mm. This method is convenient and flexible, and does not affect the structure of the cutter. As long as the overprint is accurate, it can be cut beautifully, improve the reliability of high-quality products, reduce the loss rate of "bleeding" caused by cutting and the cost loss caused by re printing, and improve work efficiency. After more than 10 years of application, the effect is very good

source: Huicong has reduced plastic shopping bags by about 1.4 million tons, and the printing industry channel

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