Problems to pay attention to in the layout There are mainly three kinds of influencing factors for the binding of the post-press binding. (1) Impact of paper: Paper directly affects the way of folding the booklet. Different papers are used for different folding methods. The more folds the book pages have, the greater the positional error of the layout, the maximum number of foldings is 4 and the maximum number of signatures is 16. Offset paper, coated paper, and sub-paper can be used in any folding machine, and can be folded at a maximum of 30%. In manual folding, 80g/m2 or higher paper is best folded in two. (2) The influence of work habits: Due to the differences in personal work habits, there are different requirements for daytime rules and ground rules for folding. As with the method of making a hand, you need to specify the direction of the rules or the rules of the feet in your hand. It is worth noting that the inner core of a book should be consistent with the rules or rules of the cover. 4. Problems to be Noted in Making Self-Reproducing and Big Turning Printing
1. Determine the printing width
The factors influencing the printing and opening of printed products include not only the printing equipment, the finished product size of printed products, but also the printing quantity, paper, color and other factors of printed products. Under specific circumstances, they should be fully considered and flexible.
(1) Printed product size factor: After the size of the finished product is determined, the size of the open format of the printing format should be determined through the calculation.
(2) Printing equipment factors: Under normal circumstances, the size of the printing format of the printing products is determined according to the condition of the printing machine. For example, the full-open printing press can be used to split the printing plate and use a four-press printing machine. Printing is a four-part version.
(3) The print factor: Usually, large-volume prints should be made into split prints to improve printing efficiency.
(4) Printing paper factor: When many pictures and books are printed, the cover paper is different from the inner core paper, and the cover can be combined into a four-up version, a three-up version or a split version according to the actual situation to ensure printing. Efficiency and quality.
(5) Color factors: Usually, in the case of unified printing paper, pages with similar colors should be put together as much as possible. If the colors are heavy or when large-area flat screens are used, four-up printing should be used as far as possible. To avoid printing problems such as stickiness, hair, uneven color, etc.
(6) Post-printing process factors: After fully understanding the specific requirements of the printed products on the post-printing film coating, card housing, UV glazing, etc., the imposition opening shall meet the requirements of these post-printing processes as far as possible.
2. Determine the printing pass and border
(1) When the front and back register printing, care should be taken to keep the direction of the cornice consistent.
(2) Try to use the larger side of the printed product as the side of the mouth. For example, the finished product size of many packages of printed materials is generally filled with printing paper, leaving no residual paper for the mouthwash. In this case, the white border or the edge of the product can be used as the edge of the printed product.
(3) Pay attention to the contents of the post-printing process such as lamination, jamming, bronzing, and cutting, and put them together on the side of the gargle and on the edge to ensure the accuracy of the printing process.
3. Meet post-press binding requirements
When newsprint, letterpress, and writing paper are folded, any kind of folding machine can be used. Up to 40% off can be used. The air must be cut out to remove the air. When the hand is folded for 40%, the air must be removed at the third fold. To avoid folds after folding the book.
(3) Effect of binding: Different binding methods determine the folding method of the imposition. For example, according to the difference of printing paper, a horse-riding folding leaflet may be a folded or used fold, or a three-handed fold, whereas a rubber-stitched book must be a folded hand. This way the saddle-stitched and glued-up stitching will be different.
(1) Color factor: When the color of the printed product is heavy, it should avoid self-reflection or big-turn printing. Otherwise, when the other side is reprinted, it may easily cause the printed side to be stained or scratched due to the ink not drying out; After printing on the plate again, it is easy to cause differences in the colors on the front and back, and it also reduces the printing efficiency.
(2) Post-printing process factors: For printed products with hot stamping, embossing (or embossing), and jamming, etc., they should avoid self-turning or big-turn printing, so as not to affect the accuracy of post-press finishing.
(3) Paper factors: When the positive and negative characteristics of the paper are not the same, self-reflection or large-turn printing should be avoided, otherwise the colors on the front and back sides will be very different.