Selection of originals and output of screen-printed negatives
There are generally three types of manuscripts commonly used in screen printing: black and white line pattern originals, color continuous tone originals, and color printed originals (secondary originals). Q: How many kinds of line manuscripts? Can hand-painted drafts be replaced by computer drafts? Computer drafting is to draw documents, patterns, tables and other graphics through various software, and output it on transparent film or sulfuric acid paper through a laser printer, as a screen printing manuscript. At present, in order to improve the printing quality, some factories use high-precision computer drafts. Q: Why are color reversal films used for screen-printed originals? Q: Why should n’t color negatives be used for color separation? Q: Why should print manuscripts go to the Internet? Why can't I enlarge the copy? Q: When outputting the positive film of the dot image, why does Qiangao use the laser image-typesetter to produce the film? Q: Can I buy a small laser imagesetter? What model is good?
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Answer: Black and white line pattern manuscripts generally include manual drawings and computer drawings. Hand-painted drafts include reflective drafts and transmissive drafts. Hand-painted drafts on white paper are shot drafts, and text, graphics, and forms drawn on sulfuric acid paper with carbon black ink are drafts. If the density is D = 3 or more, the silk screen can be directly produced.
Answer: Continuously-adjusted color manuscripts are:
1. Color reversal film is the most ideal transmission manuscript for screen-printing reproduction. It has high image clarity, bright colors, rich layers, and strong three-dimensional sense. It is suitable for high magnification. Density range D = 0.1 ~ 3.8, some can reach more than 4. Only high-end scanners or electrical extensions can be used to scan the screen to ensure the image quality. The magnification can be enlarged by more than ten times, suitable for large-format screen printing, and is the ideal manuscript for large-scale advertisements;
2. Color photographs are expanded through color negatives and can be used as reflective manuscripts. However, there is some loss of the image layer in the expansion printing (copy), or color imbalance, color cast, uneven color tone due to improper operation, the density range is D = 0.1 ~ 2.6, the dye particles are rough, and the image is more The dirty magnification is 4 ~ 7 times, and then the image is distorted;
3. The color positive film is also copied through the color negative film. The image quality is the same as that of the color photo. It is a transmissive original with a density range of D = 0.1 ~ 2.8. It is scanned with a platform scanner and placed at a magnification of 4-7 times.
Answer: This is because there is a horse cover (amber) on the surface of the color negative film. The picture can not see the effect, it is difficult to master the color reproduction. The color of the image is the complementary color of the original scene, showing a reverse image. Generally, it is not made as a manuscript, but can be copied into a positive film or a photo as a screen-printed manuscript.
Answer: Printed manuscripts are also called secondary manuscripts. They are mostly mesh-tone reflective manuscripts. They are compressed Y, M, C, and K four-color prints. The density range is low, ranging from 0.1 to 1.6, and some reach 1.8. rich. The secondary manuscript must be reproduced with the same density requirements. It can only be copied from the original, and it should not be enlarged, otherwise it will be seriously distorted. The density of the printed manuscript is lower than the density recognition ability of the scanner. Scan with the middle and low-grade scanners to prevent moiré during electro-division copying. First of all, we need to remove the mesh and blur it. If there is no mesh removal function, we must stagger the screen angle. .
Answer: Inkjet printers, laser printers, and laser image imagesetters can all output transparencies and be used as screen printing manuscripts, but the density and image accuracy (resolution) are different.
1. Inkjet printer can output transparent film and sulfuric acid paper. It uses color ink to print unusually bright color document patterns and black and white files, but the output film density is low and the quality is poor. It can only be used for the screen-printed negatives of text patterns.
2. The laser printer can output transparent film and sulfuric acid paper. It uses the principle of electrostatic imaging to make toner adhere to the graphic area on the surface of the photoconductor to form an image. After heating, the toner is melted and fixed on the transparent film base. The image is carbon Composition of powder particles, coarse particles, uneven gradation, low image density, small dot loss, large dot distortion, many trajectories, black spots, dirty version, can be used for pattern text color block screen printing originals, not color mesh tone originals Negatives.
3. The laser image typesetting machine is a laser electronic color separation screen performed by a crystal modulator or a galvanometer system with a laser as a light source. The computer controls the laser to pass or is blocked to achieve the exposure of the recorded silver salt film to form an image. Post-development processing to obtain high-precision halftone silver salt negatives. The negative film output by the laser imagesetter has high resolution, high density, smooth dots and lines, clear admiration, and rich layers. It is the best film for screen printing.
Answer: High-end printing is generally sent to the plate-making center output network silver salt film. Small laser phototypesetters on the market, such as Hangguang GP9002 and Yingzhou Linden390, can output A3 silver salt film. From the technical parameters, it can meet the accuracy requirements of general screen printing business. The price is about 20,000 to 30,000 yuan. Printing factory can be equipped to use.