一、the printing industry in the conventional term popular science
① printing is relative contrast
Refers to the K value, is an important indicator to measure whether the field density is sufficient, whether the dark adjustment level is clear, judge the degree of network increase and control the order of the image contrast;
② color density
Measure the density of yellow, magenta and green ink through red, green and blue filters respectively;
③ grey balance
Refers to the combination of colors that can produce gray.In RGB color space, R, G and B only need equal mixing to produce neutral gray; in CMYK color space, due to the four color ink, so the same amount of yellow, magenta and green primary ink with the same network percentage can not produce neutral gray;
④ print quality
The quality of the printed matter refers to the comprehensive effect of the various appearance characteristics of the printed finished products;
⑤ control strip
Select a few main quality measurement items, design some standard images, and then combine them in a certain way, which constitute the printing quality measurement and control bar;
⑥ outlets increased
In the process of plate making and printing, a phenomenon of the network size increase, which makes the actual network area larger than the expected network area;
⑦ administrative levels
Refers to the change of light and shade in the image, for printing refers to the recognizable density difference in the vision;
⑧ paste
Refers to the layout of dark network increase deformation, and connect with each other, resulting in the loss of dark level phenomenon;
⑨ fold printing rate
As a physical quantity measuring the degree of ink overprinting, used to represent the ability of the rear color ink to adhere to the previous printing surface, the higher the value, the better the overprinting effect;
⑩ flower version
Refers to the printing process of the printing plate on the graphic outlets gradually narrowed, the high-profile some small outlets lost, the field part of the gray phenomenon, the flower plate reduces the printing resistance of the printing plate, affecting the printing quality.
二、the printing industry common printing technology popular science
1. film covering process
① definition: film process is a surface processing process after printing, also known as post-printing plastic, post-printing glue or post-printing film, refers to the film machine on the surface of a layer of transparent plastic film to form a paper-plastic product processing technology.Generally speaking, according to the process used can be divided into namely coating film, pre-coating film two kinds, according to the different film materials are divided into bright light film, matte film two kinds.
② effect: the printed matter color is more bright and strengthen the toughness, the wear resistance, folding resistance, tensile resistance and moisture resistance of the printed matter have been greatly strengthened, protect the appearance effect of all kinds of printed matter, improve the service life.The most noteworthy is that film can largely compensate for the quality defects of printing products, many appearance defects in the printing process, after being covered (especially after matte film), can be covered.
2. Over UV oil, polished, over oil
① UV is some printing means (such as silk printing, offset printing) to transfer UV oil (a printing material that you can interpret as transparent ink to the product) to make it shiny and bright.Over UV oil can be printed in the whole block, or only over the part of the design (local UV light oil needs silk printing)
② polishing: Apply a layer of colorless transparent paint to protect and increase the luster of the print after drying.
