The 28 printing knowledge summarized by the master are necessary for business, technology and prepress personnel!

The 28 printing knowledge summarized by the master are necessary for business, technology and prepress personnel!

Printing is a profession that pays great attention to detail, and details often make or break an order. The following contains 28 pieces of printing knowledge, I hope it will be useful to you

1. Familiar with the technical parameters of printing equipment, such as the maximum and minimum size of the machine, the folding method of the folding machine, etc.

2. Distinguish what paper to use for printing, if it is to be self-reprinted, it is necessary to use the same paper on both sides like coated paper and book paper. Paper with different sides such as white cardboard, whiteboard paper, etc. cannot be used to make self-reprinting.

3. Some skills of typesetting: whether you can borrow the tooth mouth, whether you can borrow the dislocation of the self-reversible version to impose, whether it is a positive and negative version or a self-reversible version.

4. If the colored paper of the pit should pay attention to the left and right sides, the tooth mouth and the tail of the plate should leave at least 8mm of bleeding, if the paper is tight, the sticky position of the color box can not leave the bleeding bit, especially pay attention to the pit paper to be 3mm smaller than the length and width of the colored paper, we call it a shrinkage pit.

5. When mounting, the pit paper and color box should be cross-grained, otherwise it is easy to deform. Carton printing should also pay attention to the whiteness, stiffness and paper grain direction of the whiteboard paper.

6. For products that require precision, such as bronzing with nesting and stamping with color restrictions, the typesetting should be as small as possible, the paper is not easy to deform, and it is convenient to set up after processing.

7. If the ink position is large, the position with high overprint requirements should be arranged in the tooth mouth position as far as possible, and the color of the end of the plate is too dark, and it is not easy to register.

8. If it is a product mounted on the automatic die-cutting machine, the tooth mouth position should be left as large as possible, so as to facilitate the placement of the glue, which can ensure that the paper at the tooth mouth position is flat and does not affect the die-cutting position.

9. Pay attention to the paper pattern requirements when typesetting, especially the blister cards that are easy to deform, and the long lines are generally used for mounting cards, chessboards, boutique boxes, etc.

10. For the mounted products, it is necessary to comprehensively consider the use of paper, whether it is a waste of face paper or a waste of bottom paper, because some paper seals are not necessarily just right, and it depends on which waste is more economical.

11. When the three layers are mounted, the middle paper and the bottom paper should be 3mm-5mm smaller than the bottom of the surface, which is convenient for mounting, and it is more accurate to use the face paper as the needle position beer, otherwise it is easy to stick.

12. When imposing cards, it is necessary to consider whether it is a single card or a double card or multiple cards, which is very important for post-processing.

13. If you use a fillet machine to round the card stacking, you can consider spelling a single knife, if you use a corner press machine to squeeze the corner, you must not spell a single knife, and leave a minimum of 6mm in the middle.

14. Do not use water-based mold coating for gold (silver) cardboard, which will make the product dark and lose its luster.

15. The gold (silver) field must be printed on the multi-color machine to prevent the gold (silver) ink from being scratched if it does not dry, and if there is a word to be printed, it must be leaked, including black characters. Gold (silver) patterns and words should not be printed on the ground with the lower ink color, and the ground with the lower ink color should be made into a leaky trap.

16. If there is a numbered product, pay attention to the length and position of the number, and put it in the last process.

17. When the United Nations General Assembly edition, it should be connected up and down into the same picture, so that the ink color is consistent when printing.

18. The spot color is diluted with white ink, and it should be printed in front to prevent the white ink from covering the front color.

19. When making die-cut plates, it is necessary to pay attention to the requirements of the trace line (point line, trace line, point plus mark), such as the size of the interval between the point line, the width of the trace line, etc.

20. The sticky mouth of the box and box is generally placed on a large surface.

21. Wine labels and canned food labels should also pay attention to the direction of the paper texture, and the paper texture direction of different manufacturers and different batch numbers is different to prevent curling and sticking.

22. After laminating or varnishing, the ink color will also change.

23. Using silver as a base can make the product have a metallic luster, such as printing yellow similar to gold.

24. When reviewing and reviewing samples, the structure of the finished product must be drawn, such as the die-cut lines of the packaging box and box, so as to be checked.

25. The influence of correct typesetting on die-cutting processing:

When using the flattening automatic die-cutting machine for die-cutting processing, there is often a phenomenon that the edge of the carton is not smooth after die-cutting, which will naturally affect the appearance of the product to a greater or lesser extent.

The main reason for the appearance of the product is that when the die-cutting process is carried out on the flattening automatic die-cutting machine, it is necessary to break a few more small openings with the knife on the edge of the mouth, so as to smoothly pull the die-cut finished product out of the machine, and the small openings are reflected in the box after die-cutting, and the edge is not smooth.

The solution is mainly to put the adhesive part of the carton on the edge of the grip as much as possible in the imposition. After the clever imposition, the appearance of the carton formed by grinding and cutting will be very beautiful.

For more than two products, the printing factory generally uses two methods in the imposition. If the pattern between the two spells can be seamlessly connected, the one-size-fits-all post-press processing method should be used as much as possible, and do not leave a gap in the middle, because the one-size-fits-all method can save paper, and can also save the application of making knife molds, and it is conducive to removing waste after die-cutting, killing three birds with one stone. But if the pattern between the two spells, it can't be seamlessly connected. Or due to the limitation of the shape of the two products, it is impossible to achieve one-size-fits-all, then generally there should be at least 4mm wide knife row position between the two products, and each product should have at least 2mm pattern bleeding.

If it is a laminating product, the tooth position should be increased as much as possible if allowed, so as to prevent the rubber material from being exposed during laminating and affecting the positioning during die-cutting.

Therefore, the printing plant can flexibly and skillfully carry out imposition, which can not only save costs, but also avoid the bad impact of imposition on the die-cutting process.

26. Precautions for offset gold (silver) ink:

The ink layer of offset printing is thinner, and when printing the golden field and thick lines, the process of two consecutive printing or two step-by-step printing is often used to achieve the saturation and metallic luster effect of the semi-strong ink layer. The printing adaptability of silver ink is better than that of gold ink, only one printing can basically meet the requirements of general packaging printing, if you need to print silver in a large area or the paper used is poor, you need to take two printings to show the silver luster well. The following should be noted when printing gold (silver) ink on an offset press.

(1) choose the bottom and then print gold (silver) ink, when printing gold ink with offset printing machine, generally first print the base color (commonly known as priming), that is, choose the ink with strong hiding power and similar color to gold (silver) ink as the background color, and then print gold (silver) ink on the background ink layer, which can not only save gold (silver) ink, but also improve the gloss of gold (silver) ink layer and strengthen the printing effect of gold (silver) ink.

(2) Printing gold (silver) ink on the background ink, the quality of the background printing is an important factor that determines the printing quality of gold (silver) ink, therefore, the layout of the printing background ink should be flat, the viscosity of the background ink should be high, the dryness should be moderate, and the ink layer should be thick. The drying method of the background ink should be a combination of penetration drying and oxidation conjunctival drying, and the crystallization of the background ink layer should not be avoided. When printing gold (silver) ink, it should be overprinted when the ink layer of the background color is not completely dry, otherwise it is easy to appear that the gold (silver) ink cannot be printed, or the adhesion fastness is poor, and it will fall off after wiping.

(3) Overprinting other inks on the gold (silver) ink layer, in addition to the metal powder itself has a metallic luster, the main thing is that its surface has a reflective effect on light, if the gold ink layer is printed with other colors of ink, it will affect the metallic luster effect of the gold ink layer. Therefore, this should be taken into account in the design of the printing process, make full use of the high opacity and strong hiding power of gold ink, reasonably arrange the printing color sequence, and try to arrange the gold ink in the last color sequence. If you must overprint other colors of ink on the gold ink, the graphic area should be as small as possible, so that it will not affect the effect of the gold ink, and can better prevent the occurrence of printing defects such as poor overprinting.

27. There are four most common specifications of paper:

(1) Positive paper: length 109.2 cm, width 78.7 cm

(2) Generous paper: length 119.4 cm, width 88.9 cm

(3) Self-adhesive: length 765 cm, width 535 cm

(4) Carbonless paper: There are specifications of positive and generous.

28. The general commonly used imposition methods can be divided into the following types:

(1) Single-sided: This method refers to those prints that only need to print one side, such as posters, etc., only need to print the front, and the back does not need to be printed.

(2) Double-sided: commonly known as "bottom version", refers to the front and back of both sides need to be printed printed, such as some small leaflets, small posters, cards, etc.

(3) transverse type: commonly known as "self-turning" and "turning over the plate", suitable for magazines, books and periodicals of the printed matter, such as a 16-open magazine cover, divided into cover one, cover two, cover three, cover four and so on four layouts need to be printed, in the imposition of the cover one and the cover four, the cover two and the three horizontal spell together, and then the cover one and the four, the two and the three head to head on a four-open layout for printing, and so on one side of the printing is completed, the paper is rotated 180 degrees, continue to print with the reverse side, after completion, Cut the print in the middle and you get two identical prints.

(4) Flip type: use the same printing plate to print on one side of the paper, and then flip the paper to print the back side, but use the other long side of the paper as the "bite edge". This method is commonly known as "tipping", but few people use it anymore. Remember to leave a bite on both sides.