Diary printing requires high quality, and this high quality requirement is mainly reflected in the folding accuracy. After countless times of exploration and trial, we have subdivided the general problem of folding precision into every aspect of the folding, and broke each. From the beginning, we can't print qualified products, we have products that meet the company's quality requirements, we will receive production orders, and we will start mass production and reduce waste. We have put hard work and hard work every step of the way. I have made some summaries of the folding machine adjustment experience in the past few months and share it with everyone.
Detailed analysis of the folding machine structure
We use the Swedish sauna company's F840 folding machine. After the paper strips out of the printing tower and before entering the folding machine triangle, it passes through a super structure containing a number of paper rollers, including a set of steering rollers. Angle Bar, which cuts a piece of paper from the middle into the same two sheets of paper and places them in the same plane, making them the same by a steering roller at an angle of 45° to the direction of the printing press. The two half-sheets of the plane become two paper strips that are parallel in one turn, and overlap on the RTF roller of the folding machine after passing through the "S"-shaped crown adjusting roller and the paper-feeding roller, and finally enter the folding The set square of the page machine. At the triangular plate of the folding machine, one longitudinal folding of the paper is completed, and then the horizontal folding is completed by the tabloid folding cylinder and the double folding cylinder, and finally the product of 32 pages per A5 size is obtained, which is us. Do a lot of products.
In the middle portion of the folder, there are four sets of rollers between the set and the cutter drum. The first group is the paper guide roller at the tip of the triangular plate, which is the same as the newspaper folding machine. The second set of rolls is a platen roller that primarily provides the tension of the tape before it is cut. The third group consists of two opposite rollers, one with a perforator for punching and the other with a knife for the skip cutter. This set of rollers will punch the back of the book according to the product. The fourth group is also the platen roller. In addition to providing the tension of the tape, if a circular skip knife is added in the middle of the platen, the back of the book can be punched in a quarter-fold.
Deep exploration of folding links
In order to greatly improve the folding accuracy and meet the quality requirements of the products, we subdivide the problem of folding into each folding section and solve them one by one.
1. The first vertical folding section
The first folding of the folding machine, that is, the first vertical folding is completed by the triangular plate, and the accuracy of the folding can be ensured by the registration adjustment, that is, the axial movement of the printing plate cylinder. In the process of the first vertical folding, the following problems should be noted: 1 When performing the registration adjustment, the center line positions of the front and back sides must be completely aligned; 2 each time the paper is connected, check the center line position when registering the adjustment. Accurate; 3If the first set of rollers in the middle part of the folding machine is adjusted because of the wrinkles at the tip of the triangular plate, the angle between the two rollers and the change of the position of the tip of the triangular plate directly affect the change of the position of the center line, so the adjustment Check and re-adjust immediately.
2. The first horizontal folding section
The first horizontal folding is done by inserting the signature into the teeth after the tape is cut into a signature. In order to increase the speed of the folding machine, the ratio of the diameter of the cylinder of the nip roller to the plate cylinder is 2:1. There are two sets of teeth on the same nip roller, each set has two rows, and one set is used for the tabloid drum folding. The page, another set for the double folding cylinder. There are two sets of boring pins and two folding knives on the tabloid folding cylinder. At the beginning of the printing, we found that no matter how the folding position is adjusted, there is always a difference between every two signatures. We checked the teeth and checked whether the pinholes were elongated. At the same time, after replacing the two new folding knives, the folding situation was not improved. Later, the phase cut by the same cutter was found. The length of the two adjacent signatures should have been 630mm, but the actual length is not exactly the same, which leads to the inconsistency of the adjacent two signatures.
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