Color classification of color printing cartons Color design of carton packaging

In the printing industry of color-printed cartons, the various classifications of printing are getting finer and finer, and the finer the branch, the better the development.

Printing Color Classification

(1) Monochromatic printing In a printing process, only one ink color is printed on the paper, which is called monochromatic printing. A printing process refers to a single feeding and delivery of paper on the printing press.

(2) Multi-color printing In a printing process, two or more ink colors are printed on the substrate, which is called multi-color printing. Ordinary refers to the application of yellow (Y), magenta (M), cyan (C) three primary colors and black (BK) ink overprint to reproduce the original color printing. At present, it is generally four-color printing on the market (see the four-color printing machine diagram). For some spot color prints, such as line charts, lists, maps, etc., it is necessary to use yellow, magenta, and cyan primary color inks to assign specific colors or to supply spot color inks from ink manufacturers for printing.

Color form of color printing carton printing

1. RGB color form

The vast majority of the visible spectrum in nature can be represented by a mixture of red, green and blue light in different proportions and intensities. RGB distinguishes between three colors: R for red, G for green, and B for blue. RGB models are also known as additive color models. RGB models are commonly used for lighting, video and screen image editing.

The RGB color mode uses the RGB model to assign an intensity value in the range of 0 to 255 to the RGB weight of each pixel in the image. For example: pure red R value is 255, G value is 0, B value is 0; gray R, G, B values are equal (except 0 and 255); white R, G, B values are all 255; black The R, G, and B values of are all 0. Using only three colors in an RGB image allows them to be mixed in different proportions to reproduce 16581375 colors on the screen.

2. CMYK color format

The CMYK color format is based on the light-receiving characteristics of the printing ink on the paper, and each pixel in the image is composed of cyan (C), magenta (M), yellow (Y) and black (BK) colorants according to different proportions composition. Each printing ink for each pixel is assigned a percentage value, with the brightest (highlight) colors assigned a lower percentage of the printing ink color, and darker (shadow) colors assigned a higher percentage value. For example, a bright red might include 2% cyan, 93% magenta, 90% yellow and . black. In a CMYK image, pure white occurs when all 4 weights have a value of 0. The image in the form of CMYK color includes 4 channels, and the graphics we see are the result of these 4 channels.

The CMYK color format is used when creating images for print color printing. Color separation occurs when an image in RGB color format is converted to an image in CMYK color format. If the image material you use is in RGB color format, it must be converted to CMYK color format after editing, and the image quality of the image must reach at least 300dpi.

Color printing carton printing paper classification

paper specifications

The specifications of the paper include the type, size and weight of the paper.

1. type of paper

In printing paper, paper is generally divided into two types: sheet paper and roll paper. The web is used on rotary printing presses, and most of the ordinary printing uses sheet paper.

2. paper size

The size specifications of printing paper are divided into two types: sheet paper and roll paper.

The size of a single sheet of paper is: 800mmXl230mm, 900mmX1280mm, 1000mmX1400mm, 690mmX960mm. The allowed deviation of the paper format is ±3mm, and the paper that meets the above size specifications is full-sheet or full-open. Among them, 880mmXl230mm is the international standard size of the A series.

The length of the roll paper is generally 6000m as a roll, and the width dimensions are 787mm, 850mm, 880mm, 1092mm, 1575mm, 1562mm and so on. The allowed deviation of the web width is ±3mm.

3. weight of paper

The weight of paper is expressed by basis weight and ream weight.

The basis weight is the weight of the paper per unit area, and the unit is g/m2, that is, the gram weight per square meter. Commonly used paper weights are 50g/m9, 60g/m2, 70g/m9, 80g/m2, 105g/m2, 128g/m2, 157g/m2, 200s/m2, etc. The larger the basis weight, the thicker the paper. If the basis weight is below 250g/m2, it is paper, and if it reaches or exceeds 250g/m2, it is cardboard.

Ream weight is the total weight of paper per ream, and the unit is kg. 1 ream of paper is 500 sheets, and the size of each sheet is the standard size, that is, full paper or full open paper.

Depending on the basis weight and format size of the paper, the following formula can be used to calculate the ream weight.

Ream weight (kg): paper width (mz) X500X quantitative (g/m2)

The color design of the carton packaging and decoration is attached to the graphics, text and muscles. It not only requires beauty and generosity to meet people's aesthetic requirements, but also highly coordinated equipment consumables with people's psychological feelings. Color design mainly considers the following aspects:

1. Color tones

Tone is the general tendency and general mood of the color configuration on the screen, it is the main color of a group of colors, and it has an absolute advantage in the whole screen printing technology.

Packaging is required to stand out from a momentary vision on a long-distance shelf to convey product information, which requires a strong overall sense of color to match the printing market. Therefore, the key to packaging color design is the color design equipment consumables.

The color tone design requirements are unified with the main functions of the product. For example, the cold-tone printing technology should be used for the packaging of cold drinks such as red and orange tones. The color tone design requirements are unified with the times, with the preferences and dislikes of different regions and different ethnic groups, and should be able to adapt to this change and conform to the trend of the times; such as:

Islamic people prefer green and avoid yellow;

Tibetans take white as their noble color, and avoid light yellow and green;

Manchu people like yellow, purple, red, blue and avoid using white and other material quotations.

The color design should fully consider these traditional habits, in order to make the product popular. For export commodities, the packaging design can only respect the custom printing market of other countries or nations.

2. Color contrast

On the twelve-color phase circle, the two opposite colors are called contrasting colors, and the difference in hue and brightness is the largest, leaving a sharp and strong sense of contrast to the printing tools.

Only through contrast can color express the image correctly. The contrast mainly includes the following three aspects: the contrast of lightness includes the contrast of lightness of the same hue and different hues, which needs to be compared repeatedly in order to accurately express the central part of China.

Brightness contrast can enhance the sense of crispness. The stronger the contrast, the clearer the visual effect, and vice versa, the more blurred the visual effect of the printing market. Contrast of purity In the same hue, the higher the purity, the more vivid it is, and the lower the purity, the more cloudy the middle of China. Contrast of purity strengthens the full-bodied printing alliance.

Color phase contrast is the color shift phenomenon caused by different hues when two or more colors are juxtaposed or alternately changed, and can be divided into adjacent color contrast, complementary color contrast and cold and warm contrast printing tools.

In the color contrast design, the contrast should be just right, so that the picture is bright but not vulgar, flashy but not floating, and a harmonious and harmonious middle printing is produced.

3. Harmony of colors

On the twelve-color color wheel, two similar colors are called harmonic color printing tools. Color harmony gives people a subtle, rich, elegant, pleasant and comfortable feeling of printing alliance. The main reconciliation methods are:

The same color tone refers to the color combination of the same color but different brightness, such as the combination of light green, bright green, dark green or the combination of light red and red, dark red. Approximate color tone sum refers to the combination of different colors containing common components, such as orange, vermilion, and yellow all contain yellow components, and it is easy to coordinate the printing technology together.

4. The Rhythm of Color

Rhythm is an important factor that constitutes the sense of form of the picture, and there are many changes in the picture, such as strength, size, light and shade, rigidity, softness, height, and reality. The alternation of these contradictions is not a simple repetition, but a Various forms of rhythmic movement, it has both repetition and development, and all aspects restrict and promote each other, reflecting the natural harmonious printing market. Judging from the picture effects, there are intense, smooth, happy, melancholy and other printing tools.

A variety of different colors form an organic whole to reflect the same theme, and are integrated into the rhythm of equipment consumables. In the color relationship, contrast is the factor of change, and harmony is the factor of unification in printing technology.

The basic requirements of packaging color design are: to deal with the relationship between change and unity, seek change in unity, seek unity in change, and the two complement each other printing technology. At the same time, the good color effect of the packaging does not lie in the use of too many colors. The key lies in the selection and coordination of colors. Using too many colors can easily lead to the feeling of clutter and "flowers", which looks tacky and central printing.