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Wei you each step of printing and technical personnel, have quite rich actual combat experience, the following are some items to carry on the analysis of offset printing, this is wei you print as the top of the core.
1、 The basic principle of offset lithography
Principle of oil and water don't mix；
Selective adsorption principle of the plate；
Outlets in assaying principle；
Indirect printing principle。
2、Printing color sequence arrangement
First generally in wet pressure under the condition of wet, printing ink, its dominant colors, such as the first printed green after the magenta, dieyin color slants blue; First printed after the magenta and green, dieyin the partial red color. And in the case of dry wet pressure, it is after the printing ink color. Consider, from the Angle of the optical flat printing press wet wet appropriate USES CMYK color sequence.
In general, for warm color print mainly on figure painting, color sequence should be black, green, magenta, yellow;
In landscape painting, snow cold tonal give priority to, such as calendar, printing color sequence should be black, magenta, blue, yellow;
Two-color machine printing color sequence for green + magenta, black + yellow, monochrome machine printed the color sequence is green, magenta, yellow, black, or black, green, magenta, yellow (generally when black version for skeleton version, black print before);
To facilitate the dieyin, should according to the ink layer thickness from small to large order of sequence of color, such as 0.8 0.9 um um - green ink, black ink magenta ink 1.0 1.1 um um - yellow ink;
In printing ink viscosity from big to small order arrangements for printing color sequence, such as black ink 1188 pa. S - green ink 488 pa. S - 477 magenta ink pa. S - 147 pa yellow ink. S, if ink viscosity can not meet the requirement of the arrangement, can be adjusted to ink viscosity in advance;
Cover small ink should print first, dark ink should be printed (for its big viscosity, high covering power, avoid sticky dirty on the back);
UV printing ink, due to different the degree of absorption of UV photons from curing speed varies, so printing color sequence should be black, blue, yellow, magenta is most appropriate.
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3、Four-color printing using four-color printing process, if there is a large area of black solid bottom, field density is less than 1.8 because of the ink, in such a large area of black printing density of the substance, the lack of solid visual effect, the commonly used method is in large part dieyin black spot around 40% of the green.
4、Color printing a product at the same time use four-color printing and color printing, four-color printing part by controlling the field density makes the picture correct reduction, background part through appropriate increase the amount of ink ink uniform thick visual effect. If electronic documents or film is beyond CMYK four-color plus 2 ~ 3 color, which one color of ink coverage area is lesser, it is easy to match with CMYK, can lose the color. If the customer provide the manuscript only CMYK four-color overprint, but in the actual printing its hue and difficult to control, such as blue and magenta overprint into purple, if the blue ink is partial blue, if the magenta ink is partial red, then might as well will change color purple version here, although more than a version, but the printing preparation time was shortened, the printing speed is raised, the hue control stability.
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Printing type and process
Picture album
① Saddle stitch
A simple forms of bookbinding. Processing cover and book block each post form a complete set together as a book, the book after book and cutting, binding, horse riding book after book nail saw exposed ten percent sewn at the end of the book. Due to core book book is on the stapler bound, therefore calls saddle stitching.
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②Lock line binding
Lock line binding refers to thread will wear all pages together, then use glue to print each page on the spine of a bound. Lock line binding are the benefits of using adhesive book core at the same time with the fixed lines, opened the book can be fully displayed when the content of the book, from the book to the auto-complete binding method.
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③The hardcover
One of book form, usually with a stiff paper, leather, fabric, plastic cover, such as do some spine cloth, higher technical requirements. Hardcover divided into full paper hardbound, paper cloth hardcover, comprehensive material hardcover ridge; Three hardbound style have peace garden ridge ridge two forms.
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Packing box
①Card carton
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②Hardcover box
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Process
①Hot stamping process
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②UV process
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③Shock convex process
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