Discussion on post binding technology

2022-09-22
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Talking about the post binding technology

in the binding process of books and periodicals, especially in the production of binding linkage line, the book page is the main raw material input into the machine. The quality of its folding and the accuracy of its storage mode will directly affect the running quality of the whole machine and the overall benefit

first, it is very important to tidy up the pages before entering the machine.

according to our field investigation of more than a dozen binding linkage lines: more than 60% of the downtime of the binding machine is caused by the non-standard pages. Even if the linkage line with a waste disposal device will not stop, it will reduce the production efficiency due to neutral operation. Therefore, in order to make the equipment imported with millions of Yuan fully exert its benefits, it is necessary to minimize the occurrence of shutdown and neutral operation, and ensure the balanced and stable operation of all stations of the whole line. According to this, we should adhere to the following in the treatment of pages: 1. After the air in the pages is fully removed from the cutting edge of the pages, firmly bind them with hardwood, and stack them horizontally to keep the pages flat. 2. Try to avoid the appearance of thin pages. Double pages that are unavoidable due to printing restrictions should be handled in a nested manner. When throwing up illustrations or single pages, you should paste them on the adjacent pages, and then bundle them. This seems to increase the workload, but it is economical in terms of mechanical support and operation efficiency (especially the binding linkage line), and the page matching error rate of books and periodicals is also greatly reduced. Because we insist on treating the pages before entering the machine strictly according to the set process. The binding product quality and work efficiency have been significantly improved. For example, the recently processed book "geography of junior middle school" with 16 folios and eight prints runs evenly at the speed of 6000 copies per hour for more than 1.5 hours, and each station has no end obstacles, downtime and idling, so that the operation of the whole line has reached the better level of the binding line of the same grade

second, the temperature adaptability of the pages should be handled in winter

general scale printing enterprises are used to storing the folded pages in unheated warehouses or outdoors due to the limitations of book production cycle and plant area. This storage method has no significant effect on the bonding effect of bound books and periodicals in spring, summer and autumn. In the cold winter, if the pages stored in the warehouse or outdoors for many days are immediately glued, it will seriously affect the bonding strength, and even cause scattered pages of books and periodicals. This is because the surface temperature of the glue decreases instantly and solidifies rapidly after the glue liquid contacts the frozen book pages. It is difficult to infiltrate the pages, thus significantly reducing the bonding effect. Therefore, when processing hot-melt binding books and periodicals in the cold season, we must store the pages in an environment with the same ambient temperature as the binding machine for more than 24 hours, and carry out aging treatment to ensure the internal quality of binding books and periodicals

III. back milling and slotting should pay more attention to the quality of slotting. In recent years, rotary machines and folding machines are widely used in printing. Binding production improves the folding quality. The short position of the Department's manual folding has caused the processing units to generally face up to the fact that the oil return pipe injects oil and vibrates during the loading of the testing machine, and the problem of milling the loose pages has been better solved. Out of an old professional habit of binding, the author observed and read 60 kinds of books with different thicknesses and sizes in Beijing Xidan Book City, and used the empirical method of monitoring the quality of books in factories to read the quality of bound books. Among the 60 kinds of books, there was no loose page caused by milling back. All books with flat backs, flat backs with a certain tension, and no creases on the backs, have better slotting, which is obviously processed with better functions. Even if the adhesive layer of this kind of book is within 0.6mm, the back of the book also has high strength. With greater force, the back of the book can still be restored to its original shape. On the contrary, for books without slotting, even if the adhesive layer is more than 1mm, if you turn it over with a little force, you can see the paper section and adhesive layer behind the milling, and the back of the book is creased. Such books are generally caused by the use of slotting mechanism without accurate adjustment on small disc machines and self threading machines, which is a quality defect. Over the past few years, we have taken the slotting quality of the pages behind milling as the main monitoring focus to control and transform, which has better solved the imperfect department mechanical structure of the station, making the operation of the slotting station less disorderly and the structure more reasonable. For example, the imported Wallenberg binding linkage line, the original design of the back plate of the slotting knife is made of soft materials, which can avoid the damage of the slotting knife due to improper operation, but it is not durable. Generally, it needs to be adjusted once in about two hours, and the machine will be shut down for more than ten minutes each time. In addition, due to the soft and fast wear of the backup plate, the depth and beginning of the book slot before and after the adjustment and installation of the backup plate are different. To ensure a more consistent slotting, it is necessary to adjust and replace the backup plate frequently, which increases the downtime and severely restricts the performance of mechanical efficiency. Through analysis and research, we now change the slotted back plate into cemented carbide material. Through precise adjustment, the slotting depth can be correctly controlled at about 1.2mm, and it will not be replaced for long-term use. Since October 4, 1999, we have installed and used an alloy rear backup plate, which is produced in two shifts at the speed of 6000 copies per hour every day. Up to now, it is still in normal use and has received excellent results. The slotting cutter of the disc binding machine is on the same cutter head as the milling cutter. Although it is difficult to adjust the average and orderly slot type due to the limitation of the mechanical structure, as long as the accurate adjustment is carried out carefully to maintain the balanced operation of the machine speed, it can also open a more ideal slot type and produce books and periodicals with qualified quality. In short, no matter which model is used to produce binding books, the accuracy of slotting directly affects the quality of books and periodicals, which is one of the important links that should be well controlled in the binding process

IV. accurately use the rubber wheels at different stations

an adhesive book with beautiful appearance and reliable quality. In the production process, the accurate adjustment of the front and rear rubber wheels cannot be ignored. Each type of binding machine is equipped with at least one set of glue ovens, and each set of glue ovens has two rubber wheels to glue books running. We adjust and use the two rubber wheels in this way: adjust the first rubber wheel to slightly contact the books after slotting, so that the glue liquid brought by the built series copper-clad aluminum flat row and line demonstration production line can be poured into the book slot with a large extrusion pressure, so as to fill the glue slot, but not squeeze and deform the back of the book. The second rubber wheel is relatively free from the book, which should be adjusted according to the thickness of the book and the paper condition according to the ideal thickness of the adhesive layer, so that it is appropriate not to squeeze the adhesive on both sides when supporting. In this way, we adjust the front and rear rubber wheels to produce various books and periodicals. The thickness of the cutting edge and the thickness of the back of the book are basically the same, which ensures the flatness and beauty of the bound books

v. accurately select and use hot melt adhesive

when we cleaned up the hot melt adhesive after melting outdoors last winter, we found that the hot melt adhesive used was very fragile after freezing. We immediately made films of five brands of hot melt adhesive at various prices in the factory and carried out a simple freezing test in the refrigerator. The test results showed that only two kinds did not break after freezing at minus 2 ℃ for 4 hours. When we telephoned a large rubber factory for this index, the other party did not have this maintenance. It is hard to imagine that books made of this glue will not be scattered in the cold winter. At least, there is no guarantee that they will not be scattered. Our factory is located in North China, where the color temperature is below zero for at least a hundred days a year, and most users of our books are also in this area. Especially for the readers of textbooks, most of them are rural students, whose reading environment temperature in winter is below zero. According to this, we must carry out strict maintenance for each brand and batch of hot melt adhesive entering the factory, and only the adhesive with qualified indicators can enter the workshop. This ensures the quality of binding products. We hold that the CTI (relative leakage tracking index) of stanyl (polyamide 46) and stanyl fortii (polyamide 4T can be elected without the second round of election) are much higher than that of the 400V system. The main indicators are as follows:

(1) low temperature resistance. We have designed a temperature controlled freezer with a temperature control error of +/- 1 ℃ and a temperature measurement range of -10-10 ℃. The hot-melt adhesive is made into a certain adhesive strip, which is placed on the bending frame of the freezer, and the bending experiment is carried out after 30 minutes of constant temperature at the specified temperature. Those that crack continuously at -1 ℃ are qualified products. At present, we are beginning to design an automatic low temperature resistance tester to make the measurement results more objective and scientific

(2) fatigue intensity. This is an index to detect the bending resistance of the adhesive layer, which can ensure that the books can remain intact after repeated reading. First, the hot-melt adhesive is made into adhesive strips according to the specification, and then tested on the fatigue strength tester (self-made) at the specified temperature

(3) specific gravity. Through comparative tests, we found that the comprehensive function of the adhesive with a specific gravity greater than 1 is lower than that of the hot-melt adhesive with a specific gravity less than 1. In addition, the greater the proportion of hot melt adhesive, the greater the weight of single book when the adhesive layer is the same, which will significantly increase the production cost. The specific gravity can be determined according to the relevant adhesive determination methods. In practice, we often use the water drift method for qualitative determination: the glue with a specific gravity greater than 1 will sink to the bottom, and the glue with a specific gravity less than 1 will float on the water surface. This method is simple, but it is fast and effective

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