Ways to monitor book quality during printing
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In recent years, the rotary machine and this folding application have been widely used in printing and binding production, which has increased the amount of folding at high speed and effectively. The short phenomenon of some manual folding has caused enough attention of each processing unit, because the milling is not transparent. The problem was solved, as an "old binding", once in the Xidan Library in Beijing, I looked through 60 different books with different thicknesses and different doors.
And using the experience method of monitoring the quality of books in the factory, looking at the quality of the book, there is no one in 60 books due to the milling. Any book with a flat back and a flat pull with no creases on the back of the book has a good slotting process. It is obvious that it is processed with a better performance. The glue layer of this book has a higher strength even if it is within 0.6mm, and it can be restored with a large force and the back of the book can be restored. On the contrary, there is no book for grooving, even if the glue layer is above 1mm, if you turn it hard, you can see the paper cross section and the glue layer behind the milling, and the back of the book will be creased. Such a book is generally caused by the fact that the slot machine is not properly adjusted on the small disk machine or the wire machine, and is a quality defect.
In the past few years, we have controlled and modified the slotting quality of the pages behind the milling as the main monitoring focus, and solved some mechanical structures with imperfect work stations, which makes the operation of the slotting station more stable and the structure more reasonable. For example, the introduction of Warrenberg adhesive binding line, the original machine behind the slotting knife is designed with soft material, although it can avoid the damage of the slotting knife caused by improper operation, but it is not durable. Usually it takes about two hours to adjust, and each time it stops for more than ten minutes.
In addition, due to the softness of the board and the rapid wear, the depth of the book groove before and after the adjustment of the board is different, and the beginning is different. To ensure a more consistent slotting, it is necessary to frequently adjust and replace the backing plate, which increases the downtime and seriously restricts the performance of the mechanical performance. After analysis and research, we now change the backing plate to cemented carbide material. After precise adjustment, the groove depth can be accurately controlled to about 1.2mm, and it will not be replaced for long-term use. We have installed an alloy backing plate since October 4, 1999. It is produced in two shifts per day at a speed of 6,000 copies. It is still in normal use and has received excellent results. The slotting knife of the disc binder is on the same cutterhead as the milling cutter. Although it is difficult to adjust the uniform and orderly groove type due to the limitation of the mechanical structure, as long as the correct adjustment is made carefully and carefully, the machine is kept. Speed balanced operation, can also open a more ideal trough shape, produce quality books.
No matter which type of machine we use to produce the glue book, whether the correct slotting process in the binding will affect the quality of the book is a link that should be taken seriously.