The purpose of bleeding is to ensure the accuracy of die cutting. Ordinary paper is generally 3mm and corrugated is generally 5-7mm. Due to the mistakes of design and composition, the bleeding can be reduced, but it must be more than 1.5mm.
Minimum size of gold and silver stamping
It is generally guaranteed to be 0.3mm, and it can be between 0.1-0.2 if the technology is good.
Large size paper, positive size paper, special size paper
Large paper refers to the paper with the size of 1194 * 889 and the positive degree of 1092 * 787. Special paper refers to the paper with special specifications. Generally, paper mills cut the paper into large positive degrees, or cut the paper with special specifications according to the needs of customers.
In addition, the magnanimity after the smooth edge of the printing factory is generally 1190 * 880 and the positive degree is 1090 * 780. If the design is wrong or the layout is required to be special, you must say hello to the factory in advance, otherwise it will be opened according to the said size.
How many lines are used for offset printing:
Generally 175 lines. There are also as low as 150 lines or as high as 250 lines.
Spot color, four colors:
Spot color refers to a specific color. During printing, spot color is not the color synthesized by printing C, m, y and K, but the color printed with a specific ink. Spot color inks are premixed by a printing factory or produced by an ink factory. For each spot color of printed matter, there is a special color plate corresponding to it during printing. Use spot color to make the color more accurate. Such as: special gold, special silver, etc.
Four colors refer to the printing color of CMYK mode.
Resolution for printing:
Generally 300dpi. Of course, the higher, the clearer.
At present, China's flexographic products are at a very low level. The quality of printed products is mainly low, coarse and simple, and the fine multi-color overprint is not very good; At the same time, the scope of application is small, mainly printing text lines and field, and the dot live printing is not very much.
The small paper bag containing chicken wings in KFC is flexible printing. Flexo printing is generally water-based ink, tasteless. In addition to the problems in equipment and technology, another main reason restricting the application and development of flexographic printing in China is that designers do not understand the characteristics of flexographic printing technology, resulting in a lack of communication between design and printing, and can not give full play to the advantages of flexographic printing.
Flexographic printing shall be designed to avoid the following aspects:
Avoid designing too small text and too thin lines;
Avoid two-color or multi-color lines and text overprint;
Avoid designing small anti white words and lines;
Avoid high light screen breaking or 1% small dots in the picture;
Avoid designing text or lines in bitmap software such as Photoshop;
Avoid designing wide and long fields and gradients along the horizontal direction of the printing drum;
Unless otherwise required, avoid making a large area of the field on the same page as the dot and small text, and avoid the inconsistency of the operating software.
That is to do overprint and edge repair. Offset printing is generally between 0.04-0.07mm. According to the flexo printing machine, it is generally large.
9 are all black stamped with other colors
Not necessarily. Depending on the area of black, generally the text is directly overprinted. In case of a large area, it is the same as trapping.
10 what to do when you encounter a large area of black
Under a large area of black, it is best to pad a color between 30-40 blue, or a similar dark color of 30-40, because in theory, black is equal to black. The purpose is to prevent insufficient black printing and small white spots.
What is film?
Take black-and-white film as an example. The English name of film is film, which means film or film. It's similar to the film used for photography.
It is used as an important medium for recording images. The color separation of pictures and texts is made, and then the output machine transmits your divided colors to films one by one. The color on each film is single. For example, if there are three colors of CMY, three monochrome films need to be produced.
There are ean (13 bits, and the last bit is automatically generated) and UPC (12 bits).
There is a special bar code tapping software. The bar code magnification factor is between 80% - 200%. The blank area on the left and right of the barcode is 3.63mm on the left and 2.31mm on the right. The blank area can only be large but not small. It is the same as that on the left and right of UPC, which is greater than 2.97mm.
The picture should have a large contrast in color matching. Try to use black bars on a white background, and a white pad should be placed under the gold and silver cardboard. If you want to shorten the bar code, keep at least two-thirds of the original proportion. The font is not mandatory and is recommended. The position depends on the situation, and the distance between the placed area and the indentation line should not be less than 8mm.
Printing effect and subsequent processing effect
Here are some common effects:
A. Frosting: it is treated into an uneven feeling of sandstone particles.
B. Ironing: there are many ironing things that are easy to see, such as bronzing, silver ironing, laser ironing and so on.
Picture C. glazing: it is a kind of post-processing to prevent the abrasion of pictures and texts and make the products more beautiful and have a certain waterproof function. There are ordinary varnish, UV varnish makes the products have a fresh and young effect, and UV dumb oil makes the products elegant. UV can cooperate with film covering to achieve extraordinary results.
D. Concavo convex: it gives a three-dimensional effect to simple graphics and texts. There is a distinction between ordinary and three-dimensional, and the three-dimensional effect is more beautiful.
Picture e: film coating: apply a thin film on the product surface to protect the waterproof and beautiful effect of graphics and text. There are light film and dumb film.
When designing, we should not only consider bleeding, but also consider the longitudinal bite of the machine, and pay attention to the grain of paper when placing an order.
When a color is almost full, please fill the die-cut part with this color as far as possible to prevent ghosts.
If the paper allows, please make a color band of not less than 4mm for each color.
Add a color code to each color, and the close-up is a spot color, so that others can see it clearly.
In addition, it should be noted that although it is relatively simple, it is very important, and people often make such mistakes: do not overprint white pictures and texts, and remember to turn the curve.
The basic knowledge of printing and packaging and printing precautions are shared here today. I hope it can be helpful to our daily work. If you encounter any problems in daily production, you are also welcome to tell us in the message area and communicate with us.
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