Hardcover book bound book block and book seal processing FAQ

Hardcover book binding processing due to multiple processes (dozens of processes), long process flow, complex operation, so the processing is more difficult than the paperback and saddle stitching, there are many quality problems, some issues directly affect the appearance and preservation of books value. The following begins with book block processing. Enumerated the common quality problems in binding books for hardcover books, analyzed the causes of the problems and proposed corresponding solutions for reference by peers.

Book block processing

1. Round circle potential does not meet the standard requirements

1 When manual rounding is performed, the regular script operation does not meet the requirements;
2 The first back book adhesive is not wet;
3 After the manual rounding, no self-calibration was performed;
4 Machine is not properly adjusted when the roller is round;
5 After the machine rounds up, the book block jolts on the linkage line.
1 When you make a round by hand, you should start the book 2/3 and then make a round;
2 The book back glue should be moistened before it is finished, making the book back soft and easy to shape;
3 Manually knead the book core after hand-rounding to correct the circular potential and verticality;
4 correctly adjust the clamping degree of the roller according to the thickness of the book block;
5 less downtime can reduce the bumping time of the book block on the linkage line.

2. After the ridge does not protrude

1 When the hand is raised, the position of the lower hammer is incorrect or the height of the ridge is too small;
2 The ridges are not properly applied and the ridges cannot protrude;
3 When the machine is ridged, the spacing between the wedge and the back of the book is not suitable, or the arc length of the wedge does not match the length of the book back arc.
1 When raising the hand manually, the position of the lower hammer should be in the middle of the spine, and the force should be on both sides. When the force is applied, the hammer should be pulled first. Both hard and soft, when the book is folded on both sides and then ridge, do not rush to calculate the ridge;
2 When the machine is ridged, the wedge should be in contact with the back of the book to press the back of the book and allow it to deform out of the ridge;
3 The arc length of the wedge should be based on the book thickness.

3. After the round book block, the front mouth is terraced

1 Excessive number of signatures, too thick paper;
2 selected coated paper;
3 The circle is too big.
1 books that need to be rounded, the number of signatures should not be excessive, under normal circumstances, paper with a basis weight of 50g/m2 or better must not be folded at 40%;
More than 25% off the coated paper signature is best not to make a round;
3 扒 circularity should be 90 ~ 120 °, if the circular potential is too large, the front port is easy to show terraced.

4. The edge of book square after the front mouth cut uneven

1 The air in the book is not completely excluded. The pages form a wavy shape, and the wavy pages of the book are straightened.
2 When the manual folding, not suppress the book block began to scrape, leading to crease run empty, the page warping uneven, resulting in the air inside the signature can not be discharged;
3 The sewing thread is too large and the thread is too thin, causing the book page to move after being cut;
4 Do not make a round when the book is too thick.
1 When the machine folds, it is necessary to adjust the sliding knife correctly to ensure that the air in the signature is completely eliminated;
2 When manually folding, press down on the book block and then level it to ensure that the book is folded flat and compacted;
3 Sewing machine needles are best to use fine needles to avoid the book pages running out due to the large gap between the diameter of the needles and the diameter of the needles.
4 Books with a thickness of 20mm or more are best made into round backs. Do not use them as a square back, because the square back will cause the front mouth to spit out pages when it is read.

5. After the spine ridges back, the back cracks

1 The type of glue used for the first time on the back of the book is improper or insufficient;
2 uneven coating, there are missed parts;
3 Aging adhesive, broken after coating;
4 improper use of ridges or rounds;
5扒 The cracks appear when the back of the book adhesive is not wetted.
1 It is forbidden to use flour paste and other plant adhesives as hardcover book adhesives, and glues of bone glue or synthetic resins in animal glues can be used.
2 In the case that the adhesive's strength and viscosity are all qualified, the application should be thin and uniform, and the amount of glue should not be too much or too thick;
3 Do not use expired or aged adhesives;
4 When the ridges are used with force, they must be light and heavy;
5 should be wet when the book is back, not dry.

6. Sticking head cloth after both ends of the hair or curved, wrinkled, not straight

1 Cloth is too soft and stiff;
2 Manually sticking the head cloth does not tighten, compact, stick firmly.
1 The plug cloth purchased must first be diluted with a thin adhesive and dried before use;
2 When sticking the head cloth, the book block should be compacted first, and then the plug should be tight and sticky after compaction.

Book Seal Processing

Book cover processing includes shell and hot stamping two parts.
1. The rounded corners of the book shell have rough corners
1 improper method of plug angle;
2 too few creases in the corner;
3 After the plug angle is not compacted.
1 can be used oblique, long handle, not sharp metal knife (such as students with a pencil sharpener, etc.), or use the thumb nails to manually plug the corner, can also be used angle machine plug angle;
2 The more creases behind the plug angle, the better, but not less than 50%;
3 After using a hand-plug angle, use a wooden hoe to pry the horns and flatten them.

Reprinted from: China Print Community

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