Postpress Technology 1000 (691-701)

691. What is the working principle of knife folding machine?
A: The working principle of the knife folding machine: the use of the knife blade will press the sheet into the between the two rotating rollers, because a pair of folding rollers in the relative rotation movement, will give the page with friction, The friction force drives the sheet through the folding roller on the one hand, and at the same time cooperates with the lower pressure of the folding knife, and presses the folding sheet while pressing the sheet through the folding roller; the page sheet is sent to the second sheet after each folding is finished. Or the 3rd, 4th fold position, and finally folded into the required number of folds of the signature.

692. What are the characteristics of knife folding machine?
Answer: The knife folding machine has high folding accuracy and convenient operation. It can fold thin paper and thick paper with a basis weight of 36g/m2 or more.

693. What are the positioning requirements for the knife folding machine?
A: The positioning requirements of the knife-type folding machine include the following: 1 rubber guide roller, 2 first folding rules, 3 3 knife pressure, 4 folding roller folding, 5 paper knife, 6 punching knife, 72, 3, 4 folding knife folding.

694. What is the role of the rubber guide roller?
Answer: The role of the rubber guide roller is to cooperate with the feed axis and play the role of conveying paper. The rubber guide roller is a passive roller that is pressed against the rotating paper feed shaft to drive the paper to the conveyor belt.

695. What are the positioning requirements for the rubber guide roller?
Answer: The pressure of each rubber guide roller should be set evenly, and the pressure given to the paper should be appropriate so that the paper can be smoothly transferred to the front stop of the folding section.

696. What are the positioning requirements for the 1st rule?
Answer: After the paper is fed into the first folding position, the first folding positioning is performed. The first folding positioning rule is longitudinally positioned by the front stopper, and the lateral puller is used for lateral positioning. Positioning requirements for the 1st folding rule: 1 The front brace is responsible for the alignment of the 1st folding code. The position of the front brace and the side pull gauge should be perpendicular to each other, and it should be positioned vertically. 2 After the paper reaches the front baffle, its side The distance between the edge of the paper and the pull gauge should be about 10mm; the pulling force of the pull gauge on the 3 side should be proper, and it must not be pulled or pulled.

697. What are the positioning operation requirements for folding knife folding?
A: After the positioning of the paper is completed, the folding knife will perform a straight downward movement and the paper will be pressed between the two rollers that are rotating relative to each other to complete 1 or 2, 3, or 4 folds. Folding knife folding positioning positioning operation requirements: 1 folding knife blade should be aligned with the gap of the two folding roller, and keep the axis of the folding roller parallel, so that the paper is pressed into the two-fold roller joints at both ends of the same height, As shown in Fig. 6; the time of pressing down the 2-fold knife is coordinated with the work time of the folding roller, and the distance h from the center line between the two-folding rollers when descending is generally 3mm, as shown in Fig. 7 .

698. What are the positioning operation requirements for folding roller folding?
A: After the knife is pressed down, the paper is pressed between two folding rollers. After the relative rotation, the paper is folded into 1 or 2, 3, or 4 fold signatures. Folding roller folding positioning operation requirements: 11 folds in accordance with 1 fold 2 thickness, 2 folds by 2 folds by 4 thickness, 3 folds by 3 folds by 8 thicknesses, 4 folds by 4 folds by 16-page thickness setting ;2 The distance between the two folding rollers can't be too big or too small. If they are too big or too loose, they will not touch the folding roller and can't complete the folding and transfer. If they are too small or too tight, the pages will be clipped too tightly and easily appear. Imprints or wrinkles.

699. What is the role of a hole cutter?
A: The punching knife on the folding machine mainly eliminates the air in the signatures, so that the signatures (especially the multi-folding signatures) are flat and wrinkle-free, which facilitates the processing of the next procedure and improves the flatness of the book.

700. What is the positioning operation requirement for punching knife?
Answer: 1 The position of the punching hole and the crease must be the same and in the same straight line.

Skew phenomenon; 2 holes punched by a punching knife should be broken through the folds, draw through, but it can not be cut off, so as not to cause the spread of posts, pages.

701. What is the positioning operation requirement of the grid knife hybrid folder?
Answer: The positioning operation requirements of the fence type and knife type folding machines in the above items can be referred to in the above sections.

- "Printing Technology - Publishing Commercial Printing"