According to the quality requirements and inspection methods of the industry standard CY / t.6-91 hardcover case, the hardcover case is divided into two types: full face case and joint face case. The whole book case is made of a complete cover material (such as cloth and paper). The cover material of the book case is not a whole piece. Usually, the cover and back cover are made of one material, and the book waist is made of one material (such as cloth waist paper surface, leather waist cloth surface and four corner cover).
Hardcover book case is composed of soft mounting material, inner layer material and medium diameter paper.
Common mounting materials include silk and satin, artificial leather, lacquer cloth, plastic paper, various fabrics and paper, etc. The inner layer material, that is, the composition and rear sealing material, mostly adopts paperboard. Thick paper or paperboard for medium diameter paper. When the book case is unfolded and placed horizontally, the distance between the back seal and the middle is called the middle diameter. The distance between the back sealed cardboard and the medium diameter cardboard is called the middle seam, also known as the spacer slot and the book slot.
On the front of the seal and middle waist, the book title, author's name, publisher's name and other decorative patterns are usually printed by hot stamping or printing. Medium diameter paper can make the middle waist of the book case firm and elastic, which is convenient for hot stamping; When reading a book, medium diameter paper is an elastic support for the book block.
Plastic book cases are not included in the industry standard. Such book cases are generally made according to the requirements of publishing houses. The utility model adopts high-frequency medium to heat the plastic film and press it according to the specifications of books and periodicals. Plastic is waterproof and wear-resistant, so it is used for binding dictionaries, manuals, reference books and so on. When in use, the hard cardboard stuck on both sides of the book block is stuffed into the sleeve layer of the plastic cover to form a book.
Book case is the coat of books and periodicals. For books, on the one hand, it plays an external decorative role, on the other hand, it is also to protect books and make them have good usability. Therefore, the book case should not only have a beautiful appearance, but also have durability, and the production materials are cheap without deformation. In order to meet the people's increasing requirements for books and periodicals, in mass production, it is also required to make the book case and fit with the book block, which is easier to realize mechanized and automatic production.
Book case making technology
1. Cutting of cover paperboard
The paperboard for the cover of hardcover books and picture albums produced in China is flat paperboard, with a size of 1350mm × 920mm。 When cutting the paperboard, first cut the paperboard edge of about 10mm from the four sides, and then calculate the size of the book shell paperboard according to the size of the book, according to the economic arrangement scheme, and cut the back of the book along the longitudinal grain of the paperboard fiber as far as possible. In addition to the single-sided paper cutter, the circular knife paper cutter connected with the paperboard flattening dryer is also used for cutting paperboard.
2. Book case making process
According to different sizes and book block thickness, the process of bonding the cut paperboard, cover mounting materials and pitch diameter together according to certain specifications is called book case making. The equipment used is called bookcase making machine or paste sealing machine. Using the case making machine, you can make the whole case or the joint case.
The bookcase making machine is mainly composed of glue brushing mechanism, cover, paperboard and medium diameter paper conveying mechanism, edging and corner wrapping mechanism, compaction and conveying mechanism, etc. Complete the department work from material conveying to hardcover case production.
After the book case is made, it must also be dried to eliminate the moisture in the adhesive during paste sealing and ensure the normal progress of the next process. There are two drying methods: natural drying and artificial drying. Natural drying time is longer, generally more than a day. The artificial drying time is short. Circulating air can be used for drying, or infrared drying, high-frequency drying, etc. Most printing plants in China use natural drying method.
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