The back of a hardcover book is different from a paperback book. The back of a paperback book is generally flush, while hardcover books can be divided into hard back, cavity back, and soft back, but each of these three binding methods has its own advantages and disadvantages.

1、硬背裝成書挺括、堅固，可放置書架上長期收藏，但翻閱時不易完全攤平；

1. The hard back is sturdy and sturdy, and can be stored on a bookshelf for long-term storage, but it is not easy to fully flatten when flipping through;

2、腔背裝攤得平，成書外觀比較平整、美觀，但長期置放在書架上似有軟塌之感；

2. The cavity back decoration is laid flat, and the finished book has a relatively flat and beautiful appearance, but it seems to have a soft and collapsed feeling when placed on the bookshelf for a long time;

3、柔背裝既能攤平，也比較堅固，只是外觀上較以上兩種柔弱些。

3. The soft back outfit can be flattened and relatively sturdy, but its appearance is slightly weaker than the above two.

不過，我國的精裝書多采用腔背裝。 精裝書印刷的裝訂工藝主要有制書心、制書殼和上書殼3個過程。書殼按面料分又分為：整面書殼和接面書殼兩種。

However, most hardcover books in our country use cavity back binding. The binding process of hardcover book printing mainly includes three processes: making the book core, making the book case, and loading the book case. Book cases can be divided into two types according to the fabric: full face book cases and joint face book cases.

整面書殼：是由一張完整的封面材料制成，即書脊和封面封底采用整片的同一種材料制成。

Full face book case: It is made of a complete cover material, that is, the spine and back cover are made of the same material as the entire sheet.

接面書殼：封面材料不是一整塊，通常是封面和封底用一種材料，書腰用一種材料并接而成。即書脊和封面用不同材料制成，通常以織物作書脊，以紙張裱糊在硬紙版上作封面，這種形式一般多為圓脊不帶護封。在精裝書封殼制作中，除塑料壓制的活套書封以外，常見精裝書封殼是由硬質紙板、軟質封面、中徑紙等經(jīng)加工所組成的。

Joint Book Case: The cover material is not a whole piece, usually the cover and back cover are made of the same material, and the book waist is made of the same material. The spine and cover of a book are made of different materials, usually using fabric as the spine and paper mounted on a hard paper plate as the cover. This form is usually a round spine without a protective cover. In the production of hardcover book covers, except for plastic pressed looper book covers, common hardcover book covers are composed of hard cardboard, soft covers, medium diameter paper, and other processed materials.

表面層的封面材料通常用各種軟質材料，如織品、皮革，各種涂布料中的漆涂布、漆涂紙、PVC涂布紙、覆膜紙、特種紙等制成。制作時，可以整幅面糊制成書封殼,可用兩種材料拼幅聯(lián)接制成書封殼。

The cover material of the surface layer is usually made of various soft materials, such as fabrics, leather, and various coating materials such as lacquer coating, lacquer coating paper, PVC coating paper, laminating paper, special paper, etc. When making, the entire dough can be used to make a book cover, and two materials can be pieced together to make a book cover.