VII. Causes and elimination of common breakdowns of bookbinding
(1) Book degumming and loose-leaf pages 1 The back depth of the book block milling is not enough, the pages are not completely milled into a single page, which causes the degumming and loosening of the book, and the depth of the milling back should be increased.
2 The distance between the knife and the depth of the knife should be adjusted by improper distance between the pulling groove and the depth of the pulling groove.
3 hot melt adhesive temperature is too low, glue liquidity and permeability caused by the book degumming, loose pages, the hot melt adhesive should be heated to about 170-180 °C.
4 book back hot melt adhesive over-filled caused by degumming books, loose pages, should control the thickness of adhesive, generally controlled between 0.62mm.
5 If the hot melt adhesive is used improperly to cause the degumming and loose-leaf of the book, the hot-melt adhesive matching the model and season should be selected.
(B) the book is not a square back 1 using a non-sharp milling cutter back to cause the back of the book is not square, should replace the sharp milling back knife.
2 The adhesive on the adhesive does not cause the back of the book to be square, and the gluing mechanism should be adjusted to make the adhesive glue even.
(3) Improper setting of improperly established institutions causes the back of the book to be incorrect and should be adjusted to the established type.
4 book stickers and finishing are not square back caused by the book is not square, should be organized to ensure that the quality of the book posted.
(3) The cover is not even and the cover line is obvious. The amount of glue on one side is too large, which causes the cover to be uneven and the cover line is obvious. The coating amount of side glue should be controlled.
If the temperature of the 2 side glue is too low, the uneven side coating causes the cover to be uneven and the cover line is obvious. The temperature of the side glue should be increased, and the temperature is generally controlled at about 160°C to 180°C.
(4) Inaccurate size of book cutting 1 The cutting size of the book is inaccurate, and the dimensions of the three-side cutter must be adjusted.
In short, as long as we continue to grope and sum up experience from practice, conscientiously understand the material's performance, master the appropriate process parameters, and strictly operate on the process, we can obtain satisfactory glue-binding products.
Source: Print Information