What is a quality book? My understanding is that high-quality books must be practical, collectible, and able to attract readers; in design, unique style, practical, and beautiful; in printing, they can be mass-produced; in quality, they must withstand domestic and foreign printing competitions Review. To achieve high-quality printing, the overall design, original manuscript quality, equipment accuracy, process technology and other aspects need to cooperate closely with each other.
Prepress / Printing
â—† Principle: Choose the appropriate printing method according to different product contents and uses.
1. FM screen printing
Features: The density of the dots is used to express the gradation of the image without screening; to avoid the collision caused by the screening (that is, the so-called tortoise or rose pattern); it can pull the gradation of the darker part of the image.
Disadvantages: The flat screen is less reductive than the AM screen, so it is not suitable for light-toned and smooth pictures, such as landscapes with morning fog, white or light-colored skin, or non-textured pictures.
Applicability: suitable for products with many image margins and high sharpness, such as oil paintings of steel, metal, and rocks, and landscape characters with thicker tones; suitable for products with more image textures, such as clothing, curtains, and fabrics Products; products suitable for simulation printing, such as ancient paintings and calligraphy.
2. High screen printing
Features: The tone of the printed picture is delicate and soft, which can fully express the image and detailed place of the picture.
Disadvantages: When printing with high screen line, the dots are easy to form when the dot expansion is serious during the printing process, and the highlights and dark tones are easy to cause the loss of image hierarchy.
Applicability: It is necessary to determine whether high-screen printing is needed according to the content and use of the product; it is suitable for high-end products with fine performance and close-up, such as picture books, advertisements, trademarks, etc.
3. High-fidelity printing
Features: Compared with ordinary four-color, its color gamut has a wider reproduction range and can more realistically reflect natural colors.
Disadvantages: The requirements for equipment are very high, requiring six or more color printing machines and high printing accuracy; high printing costs, such as increased printing plates, increased ink costs, and increased color separation software.
Applicability: Applicable to high-simulation products, such as copying of calligraphy and painting, copying of isolated copies, etc .; applicable to commercial printing of advertisements, such as calendars and product packaging.
Binding / post-press aspects
â—† Principle: Achieve the matching of materials and processes, and at the same time use various binding and post-printing processes to achieve the desired results.
1. Coordination of process and materials
The combination of hot stamping process and shell surface material: good hot stamping effect can be obtained on materials such as leather, leather filling, paper and pasted surface. If the surface is rough, the hot stamping is easy to fall off, and if the hot stamping font is too small, it is easy to paste the word, so pay attention to the choice of shell surface materials and the size of the hot stamping font when hot stamping.
Glue process and ink coordination: Glue on the surface of the metal ink printed sheet. Due to the characteristics of the metal ink, the film separation phenomenon is easy to occur after gluing. Therefore, it should be noted that this problem should be avoided when the surface of the metal ink on a large area is glued. .
The automatic production of equipment and the coordination of materials: When producing hardcover books, if leather is used as the shell fabric, the machine has a fast production speed, a short shaping time, and the shaping effect is not ideal. It is recommended to manually shell or use other fabrics. [next]
2. Application of PUR binding technology
Features: strong adhesion, long storage time; strong adaptability, can be used in high or low temperature environment; good flexibility, easy to spread out reading; protect the environment, no VOC (volatile organic matter) produced, does not pollute the environment. As shown in the image on the lower left, books made with PUR glue are easy to read.
Applicability: It is widely used, and has a good fixing force on the surface-treated printed pieces such as "Renmu" V, varnish, and film.
3. Application of flocking technology
Features: vivid image, strong three-dimensional sense, soft hand feeling, colorful patterns and patterns, flocking is not easy to fall off.
Matters needing attention: paper surface, rubber surface, leather filling, leather material are suitable for flocking; fabrics with too deep cloth texture are not suitable for flocking due to weak adhesion; UV surface is not suitable for flocking and will not stick firmly.
4. Application of other process technologies
Other applications such as bumping, partial UV, glitter, glass beads, luminous ink, fragrance ink, wrinkle oil, matte effect and other post-press technology are not introduced one by one.
â—† Principle: It needs to be used selectively according to material characteristics and product design.
1. Selection of inner paper
For products with high printing quality, such as picture books, matte coated paper is generally used (so that it does not appear dazzling when reading); for common reading materials with many texts such as textbooks, book paper (offset paper) is generally used; for classical reading materials For textual readings, beige book paper is generally used, which appears to be of high grade. For products with high simulation requirements such as solitary books and famous painting reproductions, rice paper can be used for printing.
2. Selection of cover paper
For high-end hardcover products, some leather materials can be used as the shell surface (but specifically, it is necessary to determine which fabric to choose according to the content and design style of the product). For mid-range hardcover products, leather filling or fabric can be used as the shell surface. For ordinary hardcover products, you can use coated paper glue.
3. The use of materials should take into account the practicality of the product
For different products, special materials are selected according to their functions.
4. The use of materials should take into account environmental protection
As people pay more attention to environmental protection, environmental printing will become the future development direction of printing, such as the use of FSC (Forest Management Committee) certified paper, soybean environmental protection ink, alcohol-free fountain solution, water-based varnish and the introduction of water-based film technology Wait.
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