The film occupies an important position in pre-press platemaking, and the quality of the printing quality is determined when the film is produced. Therefore, how to choose and use the film to achieve the best output is very important. After choosing a film, the next thing to do is how to achieve the best output. This is not only related to the film, but also has a great relationship with the use of the film. Such as familiarity with film performance, imagesetter settings, processor settings, developing and fixing conditions settings, etc. The reason for these settings is closely related to the printing process and the role of the film in the entire printing process. The core function of printing is to copy a large number of manuscripts, the purpose is to enable the graphic information contained in the manuscripts to be quickly and accurately directed and propagated. The process is to transfer the graphic information on the printing plate completely to the printing medium such as paper on the printing machine through the transfer of embossing ink. Before printing, the fully digitized graphic information in the computer is transferred to the film through the RIP and the imagesetter, and the graphic information on the film is transferred to the printing plate through printing. Therefore, the film is responsible for the role of an intermediary for accurately and perfectly transmitting graphic information in the whole pre-press to printing, and plays a pivotal role in the printing process. Film density is divided into high density and low density. Low density refers to the density of completely unexposed areas after the film is processed, generally around 0.05. The low density is good to make the film clear and transparent, and the quality of the printing outlet is good. High density refers to the solid density of the film after the actual 100% exposure. Generally, the printing film used for printing on coated paper requires a high density of not less than 3.5, usually between 3.8 and 5.0, to ensure that the image information on the film is transferred to the PS version when printing. When printing newsprint and offset paper, there are special printing requirements due to the paper's strong ink absorption and high-speed printing, and the high-density requirements are lower. High-density stability is required in film output production.
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The products of well-known international printing film manufacturers have undergone rigorous testing before being launched, which guarantees the overall quality and stability. The production of photosensitive materials also requires years of accumulation of scientific research and production technology. If the film manufacturers have relatively strong experience in scientific research, production, management and market of photosensitive technology, the overall performance of the film will be more fully guaranteed.
Choosing a reputable brand will often make you do twice the work with half the effort. Manufacturers who pay attention to brand reputation are quite standardized in the quality control of films. If users find errors in cards, uneven cutting on both sides of the film, uneven coating, scratches and static lines The probability of problems such as multiple and high film haze is very low, which not only improves your work efficiency, but also reduces various conflicts with users for output quality.
There are two most important parameters in plate making: film density and linearization.
Linearization means that in the color separation and plate making, it is required to ensure that the dot value set in the computer can truly reflect the printed film. Taking 50% neutral gray as an example, where 50% of the dots on the computer are required, the actual measurement on the printed film must also be 50%, and the dot error should not exceed one dot. When the dot error is large, it will cause great distortion of the printed image, which is especially obvious in color four-color printing. The more rigorous output center will conduct random sampling and linearization correction at any time every day. This is mainly because the stability of the film development and fixing conditions is difficult to guarantee.
Since the density will affect the linearization test, the density should be stabilized first. Take the new generation of Kodak high-temperature fast film Gen5 film as an example, the density is stable between 3.8 and 5.0, and the best effect is generally set by domestic customers to about 4.2. Generally, the output center should be equipped with a density meter, which is convenient for measuring the density of the film and whether the dots are within the controllable range at any time.