Paper is the main material of the books and magazines. Without paper, there is no way to talk about the binding of books and periodicals. The pros and cons of paper reflect the grades of books and periodicals, and the books and books with good grades are of high value for use and preservation, and the volumes of books and periodicals with poor paper are also reduced. Different papers have different methods in the binding process.
There are many kinds of papers that are bound and contacted. The quantitative and thickness are different. The commonly used book core (or the core) has a basis weight of 40g/ to 90g/?O. The process methods used are as follows:
1 When the amount of paper is around 40g/°C, the binding process generally does not use the automatic platform pneumatic feed type, fence type, and high-speed folding machine folding, but adopts ring-type paper feeding and knife folding machine folding because The paper of 40g/?O is soft and not suitable for quick folding. Most of the discounts are 3-4 fold, and the number of discounts is small and the signatures are soft, which is unfavorable to the next process.
When the sewing machine locks the line, the cross lock is generally used, and the cross lock line is twice as much as the flat lock, which can reduce the height of the book back and make the books and books processed and leveled.
250g/
Left and right paper, generally news and letterpress paper, is a kind of quantitative paper which is the most contacted and processed one. Compared with other papers, this type of paper is not soft or hard after forming a placard, any kind of binding equipment can be used, and there is no restriction in the process of processing. In the hardcover, the book block can be used for various styling processing.
370g/
The above paper is generally offset and coated paper. These two kinds of paper are high-quality papers, which are large in ration, large in thickness, and smooth and easy to move, and binding is difficult. In recent years, due to the increasing number of high-grade books and books, large quantities of copper plates and offset papers are used in large quantities. Often, the weight of a book is more than twice as large as that of a letterpress paper with the same thickness, and it is objectively bound to workers. Increased labor intensity.
Since this kind of paper is extremely stiff, it is suitable to fold with a machine, but the fold is not much, and it is only a three fold discount. The best effect is to fold the two fold (the number of available sets and the number of times of ordering can be reduced). After the book is easy to wrinkle or inaccurate error caused the book is not regular, in the hardcover processing is also not easy to do the shape of the back of the book (easy back out of the circular trapezoidal shape, the ridge is easy to wrinkle and fracture). The binder used for binding books and magazines should be appropriate. It is necessary to avoid the leakage of glue, and it must be adhered firmly.
The thickness of the book bound with this material is basically the same, the error is small, as long as the process is reasonable, it will not cause other quality problems due to uneven thickness.
