Suggestions on Solving the Pre-press Production Difficulties in Newspapers
2020-12-25 10:18:30
What issues should be noted in prepress production? Newspapers are printed using a high-speed web-fed press. The surface of the news paper used is rough, the paper path is long, the width is wide, the printing speed is fast, and the ink is dried by permeation and drying. Therefore, it has many different prepress productions from printing other fine products. Claim. With reference to the newly promulgated national standard GB/T17934.3-2003 "newspaper cold-ink offset printing" in the provisions of the following recommendations:
1. The number of mesh lines should be 85~120lpi. Some customers think that the higher the number of film lines is, the better the line number is, and the higher the number of mesh lines, the printed film paper is used to print newsprint. However, as far as color newspaper printing is concerned, it cannot blindly choose high-line printing. Because of the rough surface of newsprint, loose fibers, and strong ink absorption, high-line printing was selected. 2% of high-light dots could not be printed, and at the same time, the phenomenon of insufficient ink would appear, making the color of the image appear light and unobtrusive, lacking a strong vividness. sense. Therefore, the choice of network cable should be based on the characteristics of the color newspaper. According to the type of picture to choose, characters, art class manuscripts, should be rich in layers, a strong sense of three-dimensional, you can choose to use 100 ~ 120lpi screen line number, for general manuscript optional 80 ~ 100lpi screen number.
2. The sum of tone values ​​must not exceed 260%. For monochrome and color printing, tone reproduction ranges from 5% to 85%, and the sum of tone values ​​must not exceed 260%. Some customers set the total tonal value is too high, dark tone too dark, these will cause the image of the tone to copy difficult, and even paste.
3. Try to use the black version instead of the gray component. Some color newspapers are very difficult to adjust the ink, especially the deeper part of the area or the title, the field, yellow, magenta, and cyan are too dark, the gray balance is difficult to control, not easy to put ink , easy to change, not easy to print uniform, and a little overprint is not very obvious. The solution is to increase the black version, replace the grey component with a black version, and reduce other color versions.
4. Improve the color purity, depress the newsprint of the opposite color Newsprint surface is rough, flatness and brightness, whiteness is lower, the color reproduction effect is much worse than the coated paper. Therefore, in the production, for a picture with a certain color as the basic color, the basic color can be appropriately exaggerated and given full tone, so that the printing effect is more prominent, and the amount of the opposite color can be appropriately reduced to enhance the basic color Purity.
5. For newspapers with high timeliness and large print volume, the quality of grinds will be seriously affected, and even if it can be changed, it will also affect efficiency.
6. Multi-color embossing and deep-web anti-white characters should pay attention to the problem Multi-color embossed characters and deep-net anti-white characters are crushed, overprinting is not allowed, can not be identified, is another major problem of newspaper printing. Especially for advertisements, it is not uncommon for print factories to be paid or customers refuse to pay printing fees. In fact, under the high-speed printing of 40,000 to 60,000 pairs per hour, limited by various conditions, overprinting is inevitably a problem that cannot be avoided or difficult to solve fundamentally.
Non-color words, regardless of font size, cannot be used for multi-color overprinting; No. 5 characters should not be used for multi-color overlay or reverse-white processing; single color can be used without dual color; dual color can be used without tricolor; The principle of increasing the proportion of black editions as much as possible and reducing the proportion of other editions is to create conditions for printing while satisfying the design requirements as much as possible.
In short, the pre-production of color newspaper printing is particularly important for ensuring the quality of printing and improving the printing quality. There are many print quality issues that can be solved to some extent through pre-production.
1. The number of mesh lines should be 85~120lpi. Some customers think that the higher the number of film lines is, the better the line number is, and the higher the number of mesh lines, the printed film paper is used to print newsprint. However, as far as color newspaper printing is concerned, it cannot blindly choose high-line printing. Because of the rough surface of newsprint, loose fibers, and strong ink absorption, high-line printing was selected. 2% of high-light dots could not be printed, and at the same time, the phenomenon of insufficient ink would appear, making the color of the image appear light and unobtrusive, lacking a strong vividness. sense. Therefore, the choice of network cable should be based on the characteristics of the color newspaper. According to the type of picture to choose, characters, art class manuscripts, should be rich in layers, a strong sense of three-dimensional, you can choose to use 100 ~ 120lpi screen line number, for general manuscript optional 80 ~ 100lpi screen number.
2. The sum of tone values ​​must not exceed 260%. For monochrome and color printing, tone reproduction ranges from 5% to 85%, and the sum of tone values ​​must not exceed 260%. Some customers set the total tonal value is too high, dark tone too dark, these will cause the image of the tone to copy difficult, and even paste.
3. Try to use the black version instead of the gray component. Some color newspapers are very difficult to adjust the ink, especially the deeper part of the area or the title, the field, yellow, magenta, and cyan are too dark, the gray balance is difficult to control, not easy to put ink , easy to change, not easy to print uniform, and a little overprint is not very obvious. The solution is to increase the black version, replace the grey component with a black version, and reduce other color versions.
4. Improve the color purity, depress the newsprint of the opposite color Newsprint surface is rough, flatness and brightness, whiteness is lower, the color reproduction effect is much worse than the coated paper. Therefore, in the production, for a picture with a certain color as the basic color, the basic color can be appropriately exaggerated and given full tone, so that the printing effect is more prominent, and the amount of the opposite color can be appropriately reduced to enhance the basic color Purity.
5. For newspapers with high timeliness and large print volume, the quality of grinds will be seriously affected, and even if it can be changed, it will also affect efficiency.
6. Multi-color embossing and deep-web anti-white characters should pay attention to the problem Multi-color embossed characters and deep-net anti-white characters are crushed, overprinting is not allowed, can not be identified, is another major problem of newspaper printing. Especially for advertisements, it is not uncommon for print factories to be paid or customers refuse to pay printing fees. In fact, under the high-speed printing of 40,000 to 60,000 pairs per hour, limited by various conditions, overprinting is inevitably a problem that cannot be avoided or difficult to solve fundamentally.
Non-color words, regardless of font size, cannot be used for multi-color overprinting; No. 5 characters should not be used for multi-color overlay or reverse-white processing; single color can be used without dual color; dual color can be used without tricolor; The principle of increasing the proportion of black editions as much as possible and reducing the proportion of other editions is to create conditions for printing while satisfying the design requirements as much as possible.
In short, the pre-production of color newspaper printing is particularly important for ensuring the quality of printing and improving the printing quality. There are many print quality issues that can be solved to some extent through pre-production.
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