Due to the characteristics of fewer processes, fast processing speed, short production cycle, stable quality, low labor intensity and beautiful binding, etc., the wireless perfect binding process is recognized by more and more users and consumers, and has gradually become the main method of modern binding . The wireless binding process has developed rapidly in book printing, but there have also been a large number of binding quality problems. Some manufacturers do not conduct technical training for the operators and let them blindly produce, resulting in page breaks and loose pages in the bound book. , Package deviation, uneven back of the book, bubbles, shorts and Other fault phenomena, among which the phenomenon of falling pages and loose pages is the most prominent, which causes great inconvenience to readers. So, what are the factors that affect the quality of bound products? Let me talk about the author's experiences.
Staff technical quality and equipment status
First of all, the quality of the bound products is directly related to the technical level of the operators. Before taking up the job, the manufacturer must provide technical training to the operators to understand the performance, operation sequence, maintenance principles and corresponding solutions to the problem of the perfect binding machine, otherwise it will cause certain difficulties in improving the product quality. Therefore, it is necessary to increase front-line personnel's understanding of new equipment, new technologies, new products, and new processes to improve their technical quality and comprehensive capabilities.
Secondly, the intact rate of the equipment is also the basic guarantee for improving the quality of the bound products. In the production process, once the equipment fails, it should be eliminated in time to keep the machine in good condition.
Supporting measures for the binding process
The value of the printed matter depends on the finished product that is bound at the end. The quality and process of each process must obey the requirements of the binding process in order to maximize the benefits of the perfect binding process. First of all, the cover design should meet the technical requirements of the bound products. During imposition, 5 ~ 10mm extra knives should be left at the top and bottom of the cover, the purpose is to prevent the problem of dragging and a large number of downtime caused by the short cover and long book block. In addition, the accuracy of the cut cover paper and the quality of the bound product also have an important relationship. The size of the cut paper must be consistent. The angle between the edges must be 90 °. The upper and lower blades should be vertical. When cutting the cover The size should be uniform without any ambiguity. Therefore, the quality of paper cutting is the basis of the entire cover printing and cutting accuracy, and it is also one of the most critical links.
In addition, a considerable part of the problem of page breaks and loose pages of wireless perfect binding books and periodicals is related to folding. If the folding cover is too large, and the pages are not in place when the pages are interleaved, it is the cause of the pages and pages. Therefore, regardless of whether it is a machine folding or a hand folding, the four-folding page must be cut to deflate to avoid a cover; one-folding or single page is best solved by sticking pages, so that you can ensure that no pages will appear. phenomenon. For books and magazines with thick book cores and large paper weights, the thin adhesive layer is also the main reason for the pages falling out and loose pages. If the milling back is too deep (more than 3mm), it will also cause the front mouth to not be cut, and there will be page shrinkage. Therefore, the operator is required to strictly control the milling depth, the rotary page is controlled within 3mm, the flat sheet is controlled within 2.5mm, and the folding out sleeve is less than 1.5mm. When the book block is too thick, the depth of the milling back groove and the thickness of the back adhesive should be increased, which is about 1.2 to 1.5 mm, so that the back of the book is not easy to be broken and the pages will fall.
Correct use of hot melt adhesive
At present, the temperature of the EVA hot melt adhesive used in the disc binding machine is generally controlled between 160 to 180 ℃, and the temperature of the side adhesive is generally controlled between 90 to 110 ℃. It must be preheated for about 2 hours before use. Make it have good liquidity.
The use temperature of hot melt adhesive should be strictly controlled within the scope of use, not too high or too low. If the temperature is too high, the fluidity and permeability of the hot melt adhesive will increase, but the viscosity and strength will decrease, which will affect the bonding strength of books and periodicals. If the temperature is too low, the viscosity of the hot melt adhesive will increase, and the fluidity and permeability will be affected. Hot melt adhesives will thicken and become brittle and the bonding effect is not good. Coated paper books and periodicals should use some hot melt adhesives with better quality and stronger viscosity because of their higher tensile strength and better bonding effect.
In addition, according to the local climate change, the use temperature of hot melt adhesive should be adjusted accordingly. For books and periodicals stocked in low temperature and cold places, do not force the back of the book to avoid freezing and brittle fracture. It needs to be relieved indoors before use.
In short, in today's increasingly fierce competition in the publishing and printing industry, if we want to have a foothold in bound products, we must work hard on quality, so it is urgent to improve the quality of bound products. We must attach great importance to product quality, strengthen overall quality management, enhance the quality awareness of employees, master the process parameters of each process, and strictly follow the "Quality Requirements and Testing Methods of Binding Technology" for production, and continue to improve the level of Binding products Practice and keep exploring.
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