Post-print binding material and its use (2)

Card type and performance

Jam is a kind of paper product with a thickness between the paper and the cardboard. Its basis weight is generally between 250 and 400 g/m2. There are two kinds of cardboard: one is a double-sided white card, and the other is a gray card (white on the surface and gray on the bottom).

Gray card

Grey card is also called single-side gray cardboard. It consists of three layers: the surface is white, smooth and flat, and can be printed; the middle layer is a filler layer, and the raw material is poor; the bottom layer is gray and rough. The gray card texture is soft, thin, crisp, and resistant to folding, and the bottom layer is hygroscopic. It is commonly used in various kinds of packing boxes. After compounding, it can be used as a stamp album, CD sleeve, etc.

Stapling uses this material mainly for the processing of soft bookcases, looper liners, slipcovers, medium-diameter cardboard, and bookbacks. Gray card used in the binding should pay attention to the following points.

(1) When making soft shells, appropriate adhesives should be selected according to the material to be adhered to prevent stickiness or deformation.
(2) When using a flat-lock adhesive-backed paper jam, soak it in hot water for about 10 hours before use so that the paper is soaked and soft. Then use a small amount of animal bone in the soaking water to prevent cutting. When raising the hair line).
(3) When the looper is hard-linered, the bottom surface should be glued to the loop lining, because the bottom surface is rough, the penetrating power is strong, the paper is easy to bond, and the surface layer can be exposed to facilitate the nesting of the book block and the book cover (insertion sleeve) .
(4) When used in the book case medium-diameter paperboard, care should be taken to be limited to the round-backed book case, not to the back ridge, and the adhesive surface should be exposed at the bottom.
(5) When the gray card is used for compounding, attention should be paid to the selection of the adhesive and the correct application of the adhesive application process, so as to ensure that the composite is flat and firm and does not separate from the layer.

2. White card (double white)

The white card is higher than the gray card, and the white card is composed of three layers: the surface layer and the bottom layer are white, smooth and flat, and can be used for double-sided printing; the middle layer is a filler layer and the raw materials are poor. The white card texture is relatively hard, thin and crisp, and has a wide range of uses, such as various high-grade packaging boxes, cigarette cases, cups, and children's books. The white card for binding is mainly used for soft-faced book cases, paperback covers, manuals, and hard linings. The technical indicators of the white card are basically the same as the gray card.

Cardboard storage and storage

The correct storage and storage of cardboard (including cardboard) is one of the most important factors in guaranteeing the quality of books and books.

Storage condition
Cardboard should be stored in a well-ventilated warehouse or workshop, with appropriate temperature and humidity. Cardboard should not be exposed to moisture, so as to avoid deformation or aging separation; also can not be placed in the open air, because the cardboard itself needs to maintain a reasonable amount of water inside, if the cardboard long-term exposure to the sun, heating baking, etc., will make the normal moisture evaporation, the fiber becomes brittle , Reduced strength, resulting in surface warpage, causing unnecessary losses.

2. Storage method

The purchased cardboard must first understand the production date, the short delivery time and the cold pressure method must not be used immediately, and must be stored for a period of time before use. Because the newly-purchased cardboard is generally more flexible and less flexible, after a reasonable period of storage, it can make the cardboard less flexible, flexible, flat and neat and easy processing.

The time for storing cardboard is generally 3 to 6 months. If the cardboard is stored for more than 1 year, it is necessary to carry out a stockpile to balance the moisture content of the cardboard stack. When storing, care should also be taken to stack the paperboard on the paper table and avoid direct contact with the ground.

Source: Ke Yin Media - "Printing Technology - Publishing Commercial Printing"