Methods and precautions for folding hands of the m

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Methods and precautions for making large version folding hands (Part 2)

problems needing attention when making large version

1 Determine the printing opening

the factors that affect the printing opening include not only the printing equipment, the finished product size of the printed product, but also the printing volume, paper, color and other factors of the printed product. In specific cases, it should be comprehensively considered and flexible. Our common electronic scales

(1) printing product size factor: after the size of the finished product is determined, the size of the printed format should be determined through calculation under the condition that the paper can be used most reasonably

(2) printing equipment factor: in general, the size of the printed page is determined according to the condition of the printing machine. If it is printed by the full open and split printing machine, it can be assembled into a split plate, and if it is printed by the four open printing machine, it can be assembled into a four open plate

(3) printing volume factor: generally, printing products with large printing volume should be assembled into folio plates as far as possible to improve printing efficiency

(4) printing paper factor: when printing many picture books and books, the cover paper is different from the inner core paper. The cover can be combined into four folio, three folio or folio according to the specific situation to ensure the printing efficiency and quality

(5) color factor: generally, when the printing paper is unified, the pages with similar colors should be put together as much as possible. If the color is heavy or large, it should be put together as a quarto printing as much as possible, so as to avoid the quality problems such as printing easy to be dirty, scratchy, uneven color and so on

(6) post press process factors: after fully understanding the specific requirements of prints for post press lamination, jamming, UV glazing and other processes, the opening of the mosaic should try to meet the requirements of these post press processes

2. Determine the printing mouth and edge gauge

(1) when printing positive and negative overprint, pay attention to keeping the mouth direction consistent

(2) try to use the larger white edge of the printed product as its mouth edge. For example, the finished sizes of so many packaged prints are far from surprising. These sizes usually have basically filled up the printing paper, and there is no excess paper left in the mouth. At this time, the white edge or life edge can be used as the mouth edge of the print

(3) make sure that the contents of post press processes such as film covering, case blocking, bronzing, cutting, etc. are assembled on the side close to its mouth, and the edge gauge is used to ensure the processing accuracy of post press processes

3. Meet the post press binding requirements

there are three main factors that affect the folding hand

(1) influence of paper: paper directly affects the way of binding and folding. Different paper has different folding methods. The more pages are folded, the greater the position error of the page center. Generally, the number of folds is up to 4 and the thickness of the book post is up to 16

when folding paper, letterpress paper and writing paper, any kind of folding machine can be used. The folding machine can fold up to 4 folds. It is necessary to make a notch to exhaust the air. When folding 4 folds manually, it is necessary to make a notch on the third crease to eliminate the air, so as to avoid wrinkles after the book is folded

offset paper, coated paper and small paper mills with heavy sub powder pollution are forced to withdraw from the market. When folding paper, you can use any kind of folding machine according to the product classification detected by the experimental machine, which can fold up to 3 times; When folding by hand, the paper above 80g/m2 should be folded twice and then pasted

(2) influence of work habits: due to different personal work habits, the requirements for roof rules and foot rules are different when folding. It is the same as the method of folding hands. At this time, the direction of the head rule or the foot rule should be indicated on the folding hands. It is worth noting that the inner core of a book should be consistent with the ceiling rules or foundation rules of the cover

(3) influence of binding method: different binding methods determine the folding method of large version. For example, according to the different printing paper, the saddle binding fold can be a first-hand fold, a second-hand fold or a third-hand fold, while the binding must be a first-hand fold, so the way of saddle binding and binding to make up a large version is different

4. Problems that should be paid attention to when making self reproduction and large turnover printing

(1) color factor: when the color of the printed matter is heavy, avoid self reproduction or large turnover printing, otherwise it is easy to cause the newly printed side to be sticky and scratched because the ink is not dry; If you wait for the ink to dry out and then print again, it is easy to cause differences in the front and back colors, and also reduce the printing efficiency

(2) post press process factors: for prints with post press processes such as bronzing, embossing (or indentation), and jamming, self turning or large turning over printing should be avoided to avoid affecting the nesting accuracy of post press processing

(3) paper factor: when the characteristics of the front and back sides of the paper are different, self reproduction or large turn over printing should be avoided, otherwise the color of the front and back sides will be very different

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