Nanjing Aide Printing Co., Ltd. mainly provides services for the Chinese Christian Association and is famous for producing luxury hardcover books, including the Bible, The Sea of ​​Cry, and The Art of War. "Modern Chinese Dictionary", such as luxury books are representative hardcover books. The author in Nanjing Aide Printing Co., Ltd. engaged in hardcover production management for many years, now on a number of practical technical problems often arise in production, talk about their own views, only for peer reference.
Correct understanding of paper webs
Filament is the arrangement direction of the paper fibers formed during the paper production process. When the direction of the silk defect is parallel to the spine, it is a smooth thread, and vice versa. Correct understanding of the paper thread is a very special prerequisite for binding a good book. This feature of paper is also extremely important in two-color overprinting. The internal stress caused by calendering or pulling during the paper production process makes the problem of the silk defects of the paper more complicated. This should be fully realized during the design and use.
1. During hardcover processing, all paper materials, including the text, should be used in accordance with the requirements of the sliver. This can effectively avoid the uneven wave from the book block, the appearance of wrinkles in the ring lining, the book block cannot be leveled and the book spine can be used during the reading. Reduced life expectancy and other issues.
2. When the lining is lining, the glue is often applied to the gauze. Excessive moisture is absorbed by the lining and will cause the fiber to change (because the paper absorbs or loses water, the paper fiber will change in the radial direction), and the vertical change Small, so that the ring liner extends in the radial direction of the fiber. If it is smooth, then the stretched part will be offset in the pressure groove process, the final performance is flat, flat clothing, otherwise it will produce wrinkles.
3. When folding, if the crease direction is perpendicular to the fiber direction (reverse wire fold), the crease is not flat and the fibers are easily broken, which is the main reason why the life of the books is reduced and the book block is unfair.
Use adhesives rationally
Different adhesives have fundamentally different moisture content and properties and will have different effects on the materials that need to be bonded.
1. When the lining is made of cardboard, the book cover and the PVC cover must use different adhesives.
2. The effect of seasonal changes on the film should be taken into account when brushing the back of the book.
3. The drying temperature is well controlled. When the temperature is too low, the adhesive layer is insufficient to dry. When the temperature is too high, the ink is liable to melt and the book block paper is stuck.
4. For coated paper and full-size printed matter, the danger of water evaporating too quickly is extremely harmful, resulting in cracking at the end of the round.
5. In the case of wireless hardcover, the affinity of the first cold glue to be used and the second hot melt adhesive should be considered.
6. Never leave the adhesive open overnight. After the work is over, the machine must be cleaned and the lid of the plastic container must be covered at all times. Hot-melt adhesives and bone glues must not be able to withstand long or repeated heating. Otherwise, their viscosity and adhesion will be significantly reduced with carbonization.
Specification folding standard
1. When folding, the size of the book (original paper or printed sheet) of the same book should be as standard as possible. Excessive deviation will affect the regulation and accuracy of folding.
2. After folding, the size of the signature or color insert must be the same, otherwise it is not conducive to the work of matching pages and sewing lines. In particular, the use of cover posts, the length of the outer posts must be the same, otherwise there will be inconsistencies and quality problems. In addition, check whether the folded signatures are the same, consistent, and have certain deviations (5-8mm). This will not only improve the efficiency of the sewing line, but also prevent the appearance of page breaks and other phenomena. .
3. When breaking the flaps, it is necessary to consider the exhaust during the baling so as to avoid the “eight†wrinkling and to consider the firmness of the connection points so as to facilitate the subsequent processes.
4. The folded posters should be tied in time with hardwood mats to eliminate the air in the pages and eliminate the paper stress caused by folding.
5. According to the type of paper and the number of folds, the size of the opening and the number of openings of the disk knife used in breaking the seam are adjusted accordingly. Among them, the size of the opening is crucial. (to be continued)
Correct understanding of paper webs
Filament is the arrangement direction of the paper fibers formed during the paper production process. When the direction of the silk defect is parallel to the spine, it is a smooth thread, and vice versa. Correct understanding of the paper thread is a very special prerequisite for binding a good book. This feature of paper is also extremely important in two-color overprinting. The internal stress caused by calendering or pulling during the paper production process makes the problem of the silk defects of the paper more complicated. This should be fully realized during the design and use.
1. During hardcover processing, all paper materials, including the text, should be used in accordance with the requirements of the sliver. This can effectively avoid the uneven wave from the book block, the appearance of wrinkles in the ring lining, the book block cannot be leveled and the book spine can be used during the reading. Reduced life expectancy and other issues.
2. When the lining is lining, the glue is often applied to the gauze. Excessive moisture is absorbed by the lining and will cause the fiber to change (because the paper absorbs or loses water, the paper fiber will change in the radial direction), and the vertical change Small, so that the ring liner extends in the radial direction of the fiber. If it is smooth, then the stretched part will be offset in the pressure groove process, the final performance is flat, flat clothing, otherwise it will produce wrinkles.
3. When folding, if the crease direction is perpendicular to the fiber direction (reverse wire fold), the crease is not flat and the fibers are easily broken, which is the main reason why the life of the books is reduced and the book block is unfair.
Use adhesives rationally
Different adhesives have fundamentally different moisture content and properties and will have different effects on the materials that need to be bonded.
1. When the lining is made of cardboard, the book cover and the PVC cover must use different adhesives.
2. The effect of seasonal changes on the film should be taken into account when brushing the back of the book.
3. The drying temperature is well controlled. When the temperature is too low, the adhesive layer is insufficient to dry. When the temperature is too high, the ink is liable to melt and the book block paper is stuck.
4. For coated paper and full-size printed matter, the danger of water evaporating too quickly is extremely harmful, resulting in cracking at the end of the round.
5. In the case of wireless hardcover, the affinity of the first cold glue to be used and the second hot melt adhesive should be considered.
6. Never leave the adhesive open overnight. After the work is over, the machine must be cleaned and the lid of the plastic container must be covered at all times. Hot-melt adhesives and bone glues must not be able to withstand long or repeated heating. Otherwise, their viscosity and adhesion will be significantly reduced with carbonization.
Specification folding standard
1. When folding, the size of the book (original paper or printed sheet) of the same book should be as standard as possible. Excessive deviation will affect the regulation and accuracy of folding.
2. After folding, the size of the signature or color insert must be the same, otherwise it is not conducive to the work of matching pages and sewing lines. In particular, the use of cover posts, the length of the outer posts must be the same, otherwise there will be inconsistencies and quality problems. In addition, check whether the folded signatures are the same, consistent, and have certain deviations (5-8mm). This will not only improve the efficiency of the sewing line, but also prevent the appearance of page breaks and other phenomena. .
3. When breaking the flaps, it is necessary to consider the exhaust during the baling so as to avoid the “eight†wrinkling and to consider the firmness of the connection points so as to facilitate the subsequent processes.
4. The folded posters should be tied in time with hardwood mats to eliminate the air in the pages and eliminate the paper stress caused by folding.
5. According to the type of paper and the number of folds, the size of the opening and the number of openings of the disk knife used in breaking the seam are adjusted accordingly. Among them, the size of the opening is crucial. (to be continued)
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