What Are The Common Technical Terms In The Offset Printing And Packaging Industry?
What Are The Common Technical Terms In The Offset Printing And Packaging Industry?
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film
Film is a direct transliteration of "FILM" in English. The common name for film in the platemaking and output center is actually a transparent film. There is a medicine film on one side of the film. Pay attention to protect this side to avoid scratching, and there is no medicine film on the other. The printed film is divided into four colors (CMYK) and spot colors. The four color films are stacked to form a complete color image, and the spot color films are usually made into black plates for printing suppliers to make PS plates.
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PS version
The PS version is the abbreviation of "Presensitized Offset Plates" in English. The technical term is "pre-coated offset printing photosensitive plate". The PS version has the characteristics of high resolution, high resolution, full dot reproduction, rich color gradation, easy ink and ink balance, and high printing resistance . Graphic designers are very familiar with film. When film is used in offset printing, it is used as the main basis for making PS plates. This process is called "sun printing". There are water offset printing using PS plates, and good PS printing plates. The graphic part is about 3 μm higher than the blank part, so this type of printing plate is also called plano relief.
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CTP technology
CTP is a new technology gradually developed at the end of the 20th century. CTP is the abbreviation of "computer to plate" (computer-to-plate). To put it simply, CTP technology does not use traditional film-making and other procedures to realize direct plate printing from a computer. In fact, CTP technology also needs to make printing plates, but it is easier to obtain printing plates. The technology for making printing plates is directly generated from computer files. The printing plates are divided into two types: photosensitive and thermal. At present, the thermal printing technology is widely used in the commercial printing field. In China, the use of CTP technology has become more common. As the technology equipment and consumables market continues to mature, this technology will be more widely used in the future.
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Overprint
It refers to superimposing two or more colors, also known as imprinting, which is a problem that designers or output centers must pay attention to when processing image graphics. For example, in order to avoid the problem of spot color (gold or silver) graphics being dark on full black, you can print the spot color graphic first, and then overprint the full black. At this time, the graphic part needs to be hollowed out in the black version, and the graphic version should be appropriately enlarged to avoid whitening during imprinting. In practice, designers often communicate with packaging companies, such as Xiaobian's company-Lijia Packaging Factory, many times.
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Full version
Also called solid or full bottom, refers to the content of the screen covering the entire layout without any white borders. When designing a full page, in addition to abiding by the specified size design rules, you must reserve the screen overflow borders around the finished product for cutting. It is "bleeding", usually 3mm on each side. When the "finished part" is cut out of the printed product, it is the full page we want.
Overprint
In four-color or multi-color printing, the printing machine prints CMYK colors one by one according to the setting, and requires four-color or spot color printing plates to be registered. Such a process is called overprinting, which is the technical operation category of the printing supplier. When overprinting is inaccurate, the interlaced colors may reveal the original color of the paper, or the underlying color of the underlying layer. It is customarily called "exposed white" to form color misalignment, or cause the image text to appear fuzzy or defective.
Trapping
It is also called "trapping", which is mainly a technical treatment method adopted by designers to prevent overprinting. Avoid causing “whiteness” between two adjacent different quality colors. Trapping is to make the two color blocks penetrate into each other at the junction to become a safe area. This can prevent subtle problems during overprinting during the printing process. Offset causes blush.
