Book Glue Binding is an important part of the bookbinding process. The completion of this process will greatly improve the appearance of the book. If there are quality problems, it will undoubtedly reduce the overall grade of the book. The bookbinding quality of glue binding workers is not enough. It also involves technology. The production process, the quality of raw materials, the production environment of the workshop, and even the local climate conditions, therefore, it is necessary to analyze and discuss common quality problems.
Adhesive equipment caused by quality problems
1. Double cover. Broken Zhang (No Cover)
The cover double sheet is caused by the improper angle and blowing volume of the nozzle of the air blower. Adjust the blow volume first, and then adjust the angle of the blow nozzle. The general hard paper requires a large amount of air, and the angle of the air nozzle is generally between 20-40°. The broken sheet is generally caused by the inaccurate timing of the nozzle and the pager. The pager cannot complete the conveyance of the cover. The suction nozzle lifts the work, and the second half of the cover is sucked to cause a broken sheet. When adjusting, loosen the fixing nut that controls the nozzle, turn the cam so that the press wheel will completely output the cover, and the nozzle will perform the second time.
2. Receiving book is not neat
The big chuck conveys the book that has been on the cover to the receiving position, and the book is dropped after the tension is opened. Because the large chuck is located higher than the sipper, the impact of the book when the drop occurs, coupled with the continuous operation of the big chuck, so that the book falls; in the attack increased again, falling body to produce a rebound force, resulting in the receipt of books is not neat. At this time, the book-receiver must be raised to reduce the impact force and enhance the sink hardness of the book-recorder.
Analysis of Common Quality Problems in Finished Products
1. Wild glue
Wild glue is the most common glue binding quality problem when binding books, and it is mainly related to the operation status of glue binding equipment. For example, the loosening of book splints, wear of running rails, vibrations generated when the book moves, etc. will generate wild glue. After the rubber wheel is worn, the diameter of the front and rear wheels is different. After the front wheel is glued, the rear rubber wheel cannot be completely smoothed, and wild glue is also produced. In addition, the technical performance (such as melt temperature, package speed, etc.) of the glue-binding equipment during operation is unstable or does not meet the requirements, and wild glue is also generated. Therefore, to avoid the development of wild glue, first of all to deal with equipment for a comprehensive adjustment, wear parts that are too worn should be replaced, the hot melt adhesive temperature. The speed of the input, etc., is strictly controlled within the scope of the technical standards. These data can be determined after a small number of samples are tested on the machine.
2. Empty back
Airback affects the appearance of the book very much, and when it is serious, it will also cause the book to lose its originality. Leaflet. The air back may be caused by the quality problems of the hot melt adhesive itself. For example, the hot melt adhesive contains a lot of impurities and generates bubbles when it is melted; it may also be that the amount of glue is small or the glue is uneven, and the surface of the glue wheel is in poor contact with the book block. Or the glue wheel running caused by the difference in the degree of parallelism. In addition, the squeegee rubber is in contact with the book block too tightly or the rubber is too hard, so that the glue that has been brushed is also scraped off, resulting in an empty back.
The solution is: (1) choose a good quality hot melt adhesive, can be determined after a small batch of trials; (2) adjust the machine so that the surface of the rubber wheel and the book block good contact, loosen the connecting rod nut first, Raise the height of the rubber sheet, and then loosen the nut on the rubber sheet so that the book block is in parallel with the surface of the rubber wheel. (3) Adjust the distance between the rubber and the book block so that the rubber does not come into close contact with the book block, or You can soften the rubber.
3. Overfilled plastic. Pulp width is inconsistent
Pulp is controlled by the glue-glue machine. If the poor contact between the glue board and the book block, or the poor parallelism of the glue board, it will result in inconsistent width of the glue or slurry. To overcome this phenomenon, the book block conveyed by the clip board can be fixed in the sizing position, so that the brush teeth come into contact with the book block, and then the brush fixing nut is loosened, and the height and the parallelism are adjusted according to the contact position of the book block. Degrees, to achieve the best results, tighten the fixing nut, 4. Plastic hole
The first problem is the quality of the hot melt adhesive, which is similar to the air back. In addition, the unsuitable melt temperature will generate bubbles in the melter to produce a glue hole. Therefore, the temperature of the melter can be controlled. Important.
5. The cover and back of the book are misaligned
The cover transfer wheel conveys the cover to the countertop. If the delivery is insufficient or the positioning is inaccurate, the cover will be skewed. To overcome this, it is necessary to adjust the machine, first loosen the push plate transmission connecting rod fixing nut, rotate the connecting rod, lengthen or shorten the connecting rod can make the push plate forward or backward; at the same time adjust the cover and back cover parallel to the book block. The two sides push the board and the positioning of the head and foot to make it accurate, which can make the envelope accurate. It is worth noting that, before adjustment, check whether the specifications of the cover are the same, if there is a printing rule. If the size is not the same, skewed, etc., it should be removed first to ensure that the whole cover is neat and then on the machine envelope.
6. Book block up and down
Because the machine is not adjusted properly, the clamp platen of the clamper fails to timely clamp the book block sucked by the suction plate on the tray, or the clamping time is too early. Too late will make the book block up and down, and the distance between the clip board and the book block will also cause the book block to be tilted up and down. Therefore, the clamping time of the slider should be adjusted first, and then the distance between the clamping plates should be adjusted so as to be completely accurate.
7. Indentation line is too deep
The indentation line is too deep to easily cause the cover to break off, and it is also easy for the cover of the cover film to produce bubbles at this position, which eventually causes the cover to foam over a large area. Just adjust the indentation knife slightly and adjust it to the proper pressure.
8. Book is too wide or too narrow
If the back is too wide or too narrow, it will cause the book to be out of square and unsightly. This phenomenon is mainly caused by the clip board is too high or too low, the book back is too high out of the back of the book width (cover book back is wider than the thickness of the book block), clip book is too low out of the back of the book is narrow (cover book back Less than book block thickness). Therefore, we must adjust the height of the clip board to avoid this phenomenon.
9. Round back
The reason for the round back is that when the lift plate is not lifted into position during operation, when the book block is connected with the book block, the gap left is too wide, resulting in a round back or empty back (in the case of lack of glue). This can be avoided by simply adjusting the distance between the clip board and the lift plate.
(Wen/Zhou Youyi Liu Ruifen Guilin Printing Factory, Guangxi)
