Postpress Technology 1000 (790-804)

790. What are the operating requirements for the binding book before processing the hardcover book block?
Answer: (1) Before bookbinding, the book block should be hit and there should be no signposts; (2) Each bundle is accurate and the length is the same (tolerance is ±10mm); (3) When binding books, the elasticity should be moderate, Consistently, a bundle of books is not skewed, and each corner is 90°.

791. What are the operating requirements for the first coating of hardcover books?
Answer: (1) The adhesive used is animal glue or synthetic resin glue, and should not use plant-based adhesives; (2) Viscosity should be able to firmly bond each post, do not apply too much; (3) when glueing Should be thin and uniform, not spill or spend.
The hardcover book core can be cut into semi-finished products after the first coating and drying. The operation requirements of the cutting can be found in 779 to 786.

792. How many kinds of hardcover books are processed?
Answer: There are three kinds of processing methods for hardcover book cores, including hand-rounding, single-turning, and interlocking production line machines.

793. What is the function of the hardcover book core?
Answer: (1) Make the books look more beautiful; (2) Ensure that the books are not deformed after being read through many times.

794. What are the operating requirements for hand-filled book blocks?
Answer: (1) Hand-cutting is correct when starting. It should be 2/3 of the thickness of the book block. After hammering or smashing, use a board to scrape. (2) Try hard when knocking round or scraping the circle. Don't knock the block. Cracking, wrinkle wrinkling; (3) After rounding the book block, the size of the circle must be consistent with the specified arc from beginning to end. It must not be large and small at one end, and must not be skewed. The four corners above and below the incision shall be kept vertical; (4) Once the phenomenon of glue leakage is found, glue shall be immediately applied to prevent both ends from tearing; (5) The central angle of the arc after the book is rounded shall be 90-120°.

795. What is the role of hardcover book ridges?
Answer: After the book core is rounded, it needs to be ridged. Its role is: (1) to make the books look more beautiful; (2) to ensure that the books are read flat and not deformed.

796. How hard are the methods for hardcovering the core of the book?
Answer: There are two types of methods for hardcovering cores: manual ridges and machine ridges.

797. What are the operational requirements for hardcover book core manual ridges?
Answer: (1) When the book block is clamped and positioned, it must be flat, and the four corners should not be skewed vertically. The exposed part of the book's back ridge should be parallel to the top and bottom; (2) The force should be applied properly when the ridge is ridged, and it must not be split or wrinkled. Solid, straight, and maintain the correct circular potential without deformation; (3) The height of the ridge should be the same, generally 3~4mm higher than the cardboard thickness, and the angle between the convex part of the spine and the book surface The degree is (120±10)°; (4) The book block after ridges should be staggered and stacked neatly, and the bottom of each block should be set in order to prevent deformation of the spine; (5) After the book block rises, it must remain on the front mouth. The verticality of the lower corner.

798. What is the function of the second glue coating on the hardcover book core book?
A: The second coating is to apply glue on the top and bottom of the back of the book 15mm

At this point, its function is to use for pasting bookmark ribbons and plug cloths.

799. What are the operating requirements for the second coating of hardcover books?
A: (1) The adhesive used is high-viscosity animal glue or synthetic resin glue, and avoid using plant-based adhesives; (2) The adhesive glue should not be excessive when it is applied to prevent the glue from spilling over the incision. Apply evenly, thinly without flowering, thick and not piled up.

800. The specifications of the hardcover book mark bookmark ribbon should be?
Answer: The length of the bookmark ribbon should be the length of the diagonal of the book block (cut back) plus 20mm. The width of the ribbon depends on the book size of the book block, the format is small, and the ribbon can be slightly narrow; the open format is large and the ribbon can be slightly wider. The width of the ribbon is 3mm, 5mm, 7mm and so on.

801. What are the operating requirements for hardcover book block adhesive tapes?
Answer: (1) The position of the sticky ribbon is correct. The ribbon should be placed in the middle of the book block, and glued to the (10±2)mm (10±2) mm of the back of the book. (2) Sticky, sticky, and smooth.

802. What is the function of the hardcover book block adhesive plug cloth?
Answer: (1) The signatures on both ends of the guarantee book are firmly bonded; (2) The two ends of the book are blocked so that all the binding materials are not exposed and the appearance of the decorative book is decorated.

803. What should be the specifications of the hardcover book plug fabric?
Answer: The plug fabric is made by a professional processing factory. The width is generally about 12mm, and the length should be arc length (round back) or back width (square back) ± 1mm.

804. Why should the plug cloth be used before it is used?
Answer: The plug cloth purchased is soft and not stiff. After shearing, both ends cut hair. After the sticking, the cloth at both ends of the plug cloth is exposed. After the book block is pressed, the soft cotton plug cloth will appear uneven. Insufficient phenomenon, if you stick it over and stick it to both ends of the book, the above phenomenon can be solved.

- "Printing Technology - Publishing Commercial Printing"