Imprinting originals and films
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The term "photographic original" is often used in the field of image production. A photographic original refers to an opaque graphic document with a black solid block on a white, clean background. The text output from the laser printer must have a resolution of at least 600 dpi to be used as a photographic original. The copied photo or the graphic document output from the fax machine cannot be used as a photographic original because the density of such an image is not large enough to produce a positive image.
The high-quality manuscript and the high-quality positive film produced from this manuscript determine the quality of the pad printing, because if the manuscript is poor, there is no way to compensate when making the pad.
If possible, the size of the original is preferably twice the size of the finished product. Because if the size of the original is large, there are many leaks that can be reduced when performing the reduction photography, so that the obtained positive image is clear and the edge resolution is good.
Most manufacturers of screen printing have the ability to modify the draft or to scan the originals that do not meet the requirements of the photo by computer scanning to create the ideal photographic film.
Imaging system
There are many ways to make positive film, such as dry filming, direct filming, photo filming, and laser output. If you use a graphics software such as CorelDRAW, Adobe, Illustrator and Freehand to make a 1:1 original, you can use a laser printer or an imagesetter to output the film.
Dry film output system
The dry film output system uses thermal energy to copy images onto paper or film, the same principle as fax machines imaged on fax paper. One drawback of the dry film output system is that the imaged paper does not remain opaque black, it fades to brown, and if used only once, brown is not a problem, but if you want to keep the paper for later use, you should use it instead. A film, or as an electronic file.
Direct delivery system
The direct ejection system uses a computer to directly output a photographic film without a photographic process. When the image is imaged on the film, the carrier takes the film out of the image-taking device and places it in the automatic developing device. Because the film is never exposed to the air and is not contaminated by air dust, this filming system ensures the cleaning of the positive film. This film can be stored for a while without the fading problem.
laser printer
A laser printer with a resolution of 600 dpi or more can make a photographic original. The higher the resolution, the better the quality of the output film. Coated paper works best. Inkjet printers are not suitable for outputting photographic originals because the density of the output document is not sufficient.
There are a variety of special papers or transparent materials suitable for laser printer output on the market. The images produced by these special papers are of good quality, high density and good hiding power. It is best not to use a transparent acetate substrate for laser printout. Because the output image density is not enough and the image coverage is not good, the same output acetate sheets of the two claws can be stacked together to increase the density of the image.
Laser-printed documents are not as good as photographic originals output by the imagesetter, especially for printing fine lines or printing small-sized images. Usually the density of the image is not enough and the hiding power is not good. In order to make up for this defect, the manufacturer has specially developed and produced a post-treatment spray and coating material. After the laser printer outputs the photographic original, the spray can be sprayed on the surface of the image to help improve the hiding power of the image.
Plate camera
Photographic originals are used in plate making, the originals are placed in a copying frame, and the photosensitive images are taken at a desired magnification, and a positive film or a negative film is produced according to the type of the film. The photosensitive film is automatically developed or placed in a developing disk for development. The film may be contaminated by the surrounding environment during development, but this method is still used by most people. One of its advantages is that it does not require all originals to be made by a computer.
Producer
Some pad printing factories can't make photographic film by themselves. They need to go to the outside film company or the graphic production room to make a film. The general manuscript is made in an hourly price, and the sun image film is priced by area.
Film positioning
Regardless of the way in which the positive film is produced, the positioning of the film is important. In the pad printing, the direction of the emulsion surface of the film is to be ensured so that the emulsion surface is in close contact with the plate printing plate during exposure printing.
Since different printing processes have different film orientations, the orientation of the film is often confused. The film orientation diagram describes how the image should be oriented during exposure printing.
In the orientation diagram of the film, it is usually referred to as "emulsion facing down", that is, when we watch the film, the above is the image we need to print, and the emulsion should be on the back of the film.
When printing a positive image on a special paper with a laser printer, the printed image should be reversed because the ink-adjusting agent will directly contact the surface of the printing plate when the imaged image of the printed paper is placed face down with the transfer plate.
When a dry film imaging system is used, the image is integrated with the film, rather than being attached to the surface, so there is no problem with the orientation of the film. This type of imaging sometimes causes a "halo" phenomenon in the image, and the edge definition is not good, especially when printing small-sized symbols or fine lines.
Be sure to ensure that the film is not clean as much as possible, especially when printing plastic plates. Be sure to remove all stains, ink, residual emulsion, etc. before printing, especially the image area to be imprinted by the print head.
Image distortion
The printing head will produce some deformation when printing on the surface of the printing material, but sometimes the original needs to be deformed. For example, printing on the combined triangular surface, printing on the convex surface or printing on the edge, the original needs to be deformed. .
There are some tips on the deformation of the original, which can help the printer decide how to make the deformation and where to make the deformation, thus saving time.
1. Make some small grids on the imprinted version. The size of the small grid depends on the size of the printed image. Squares with a side length of 5 mm are usually used. Printing with multiple types and different shapes of the printing head, from which the printing head with the smallest deformation is found, then use this as a reference standard to make necessary deformation of the original, one small square can be used as the deformation unit at a time. . Be sure to record when you are experimenting with each type of pad, record which pad, where it is printed, how much compression is, and so on. The steps to make a deformed original using the small grid method are as follows:
· Printing small grids;
· Measure the size of each small square deformation on the printed object;
· Re-make a deformed grid pattern in the computer using the measured values of the small squares;
· Make a deformed image using the grid of the variable table for printing;
• The original that is deformed with the image is printed on the object.
2. Print a single letter with the "inverted printing" method. Circle the letters to be printed and print the transfer head at high speed so that it can completely cover the printed area. The ink is gently applied to the raised letters, and then the printing head is pressed against the ink-coated letters to carry the ink up and finally printed on the white paper. Such a deformed letter is printed on the paper, and the letter is input into the computer by the scanner, and a deformed original is elevated by the computer. The specific steps are as follows:
· Gently spray on the letters with a small amount of ink or other transferable paint;
· Use the pad to carry the ink on the letter;
The letter pattern on the pad is printed on the paper, and the printed deformation pattern is input into the computer by the scanner, and the image-deformed original is created on the computer for printing the plate. The raised letters are printed using the image-deformed original.
Original image size
When performing exposure printing, the original is rotated on a steel plate (plastic plate), and its size does not exceed the area of the steel plate (plastic plate) or the maximum area printed by the printer. In the open printing system, the length and width of the original image should be controlled within 80% of the maximum length and width that the machine can print. If this value is exceeded, the unevenness of the ink will be caused, or the image will be too close to the steel plate (plastic plate). The edge causes the pad to carry a lot of ink that should not be picked up. In closed printing systems, the image size should not exceed 90% of the diameter of the ink reservoir.
Also consider the working direction of the machine's inking plate when placing the original. If there are straight lines in the original, when rotating the original, these straight lines should be perpendicular to the working direction of the inking board or a small angle to the vertical direction. The image that is corroded in the plate is matched to the way the inking plate works.
The best way to do this is to check the positioning of the original image twice before printing the plate. Place the laser print or the original on the table together to form a whole view. According to the length direction of the work of the ink-pad (align the center axis of each plate in the multi-color press), check whether all the images are in one.