The management system of collecting, borrowing and reading in open-shelf stacks is implemented, and new books and books with relatively high utilization rate are concentrated in open-shelf stacks, which can maximize the direct contact between readers and books and greatly improve the utilization rate of collected books. But the capacity of open-shelf stacks is limited after all. According to the standard of 1 0,000 books per student, the library of an ordinary university with 10,000 people needs more than 1 0,000 books, and it is difficult to accommodate such a huge collection in an open stack. Therefore, dense stacks have become an important part of all kinds of library buildings and book collection layout, and play an important role in accommodating the collected books.

Compared with open-shelf stacks, dense shelves are mainly used to collect books. If the focus of open-shelf stacks is "use", then the focus of closed-shelf stacks is "hiding". The serial number shelving method is to assign a serial number to each book that enters the dense stack according to the order of entry. The serial number starts with 1 This serial number is different from the original attribute number (bar code number) of the book, but a serial number only used for shelving in dense stacks, and it is an additional retrieval identifier in the bibliographic database. This serial number becomes a permanent additional identifier for this book. In the dense stacks, the books are completely arranged according to the newly assigned serial numbers. As long as you know the serial number of the book, you can find the book in the serial number position corresponding to the dense stacks.

Disadvantages are: 1 The initial workload is relatively large, so it is necessary to paste the self-adhesive serial number for each book and make retrospective revision in the bibliographic database. If the scale of dense stacks is relatively large, it will take a considerable amount of labor to switch to this shelving method. 2. Shelf stacks are "messy" in content, and bibliographic database has become the only tool to find books. If the bibliographic database is wrong, the book will become a "dead book". This kind of shelving is not conducive to taking old books out of the stacks in the future. If the old books are removed in the future, an empty shelf will be formed, and it is not easy to fill books on the shelf. Box shelving method is a relatively simple shelving method, which is close to serial number shelving method. It treats every shelf in the dense stacks as a box. You can find a book as long as you know which "box" it is in.

Box shelving method absorbs the advantages of sequential shelving method, that is, it can make full use of bookshelf space, avoid shelf falling and facilitate shelving. At the same time, this shelving method has two obvious advantages. 1. provides convenience for "activating" books. Because there are no extra marks on the books in the collection museum, when a book is returned after being lent out, if it is found that the book is still of great use value, it can be transferred back to the open-shelf museum by retrospective modification and re-collection. 2. In the future, it is relatively easy to eliminate old books in the dense stacks and supplement books in the vacated space. When the old books in the dense stacks need to be removed, they can be removed and supplemented in a normal way. In addition, compared with the serial number shelving method, the workload of database construction is relatively light, because the process of pasting bar codes is omitted and can only be modified in the bibliographic database. The disadvantages of box shelving method are basically the same as those of serial number shelving method at 1 and 2 points. The classified shelving method is the most basic shelving method in the stacks at present. This shelving method does not need to process the books in storage, and can be directly put into the stacks. Compared with the serial number shelving method and the box shelving method, the disadvantages of the serial number shelving method and the box shelving method become the advantages of the classified shelving method, that is, only the books entering the dense stacks need to be reserved and distributed in the bibliographic database, and there is no need to re-shelve and relocate the books. The original call number of the book is the shelving number, which can be put on the shelves directly after reservation and allocation. At the same time, besides bibliographic retrieval, it is more convenient to enter the stacks by category.

The obvious disadvantage of classified shelving method is that it can't be shelved at full capacity, resulting in waste of stack space and frequent shelving. For books to be put into storage in the future, the classified shelving method must reserve space on each shelf, and generally, it needs to reserve 1/3 to 1/2. At the same time, because it is difficult to reserve suitable space for each kind of books accurately and evenly, the category that "swells" too fast can only be shelved by inverted arrangement. At the same time, it takes time to rearrange the shelves of old books.