Discussion on the binding process of wireless bind

2022-08-13
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Discussion on the binding process of wireless binding books and periodicals

in recent years, with the change of the binding process of books and periodicals, more and more books have adopted the wireless binding process. The wireless paperback binding process has been simplified, with stable quality, short cycle, low labor intensity of workers, and beautiful binding appearance. However, at present, there are not too many manufacturers that have formed a complete, systematic and standardized process flow in the production of wireless adhesive binding books and periodicals. Various binding problems caused by this cause great inconvenience to readers: 39. Repeat 7, 8, 35 (4) 40 after changing the sample. The main problems are page falling, glue breaking, book back deflection, empty back, shrinking pages, etc. How to use the correct process to effectively control the above quality problems requires the systematic consideration of the whole process from prepress, printing to post printing

binding is not an isolated processing process. Many irrationalities in the previous process will bring difficulties to binding construction. Therefore, from the beginning of product design, we must push the process forward according to the binding requirements

1.32 bookbinding of open double copy books

32 open double copy books. Previously, when iron wire was flat stapled, the incision of 4mm in the head, 6mm in the middle seam and 2mm in the foot was generally used. When cutting with a three-sided book cutter, the double book pusher was used to complete the cutting of the upper and lower books respectively. In the production process of wireless adhesive binding, using the above operation will produce a large head and foot break

this is mainly because the hot melt adhesive is cured, and the overall hardness is much higher than that of the previous hot backpack books. In terms of technology, we can only adopt the method of sawing with a saw knife. First cut the double wireless adhesive bound books into two and then cut them. The saw knife has a thickness, which is generally about 3mm. If the previous cut size is still used, it is obviously difficult to meet the requirements of low intensity seismic fortification zone for cutting. If the size of the middle seam is increased to 9mm, Due to the light edge and the size of its mouth, the lithographic products are incomplete. According to the actual situation, the size of the middle seam can be set as 8mm, which not only ensures the integrity of the print during printing, but also ensures the quality of binding and cutting

2. Design of milling back thickness

in order to ensure that the book paste can be completely milled at the milling back knife, the thickness of milling back is generally 2-2.5mm, the thicker books and periodicals can reach 25-3mm, and the thickness of coating back glue is generally 0.6-1.2mm. Taking the milling back thickness of 2.5mm on average, the gluing thickness of 0.9mm on average, and the normal external incision size of 3mm as an example, the external incision after the milling back gluing is only 1.4mm. If the normal folding tolerance occurs, the external incision may shrink; If you only enlarge the fold size, there will be serious deviation of the layout center, and the layout center and the connected pages exceed the standard, which will not only bring great inconvenience to reading, but also seriously affect the beauty of the binding of books and periodicals. If a 1.5mm milling opening is added in advance at the back of the milling when making up, this ensures the requirements of cutting size, eliminates the phenomenon of shrinking pages, and does not affect the beauty of books and periodicals

3. Binding problem

some people think that adhesive binding books and periodicals have no binding, and the layout center of the finished book is not centered on the left and right of the layout. In practical work, especially in books and periodicals with title words on the front page, this problem is particularly obvious. This is mainly because adhesive bound books and periodicals cannot be opened to the back of the book like sewing bound books and periodicals, because the slotting depth of paperback adhesive bound books and periodicals is generally 1.0 ~ 1.2mm. Through continuous practice, the author concludes that when the setting is about 3mm, the layout center is just in the middle, which basically meets the size standard of back milling and slotting

4. The non centering of the back of the book

the non centering of the back of the book of adhesive binding books is a very headache, which is a prominent problem in the development process from manual packaging to mechanized packaging. In the past, single and double color offset printing machines were used to print covers. Due to overprint problems, the machine attached great importance to the front stop gauge and pull gauge. Now, due to the continuous transformation of equipment, the market pursues a short cycle and requires fast cover matching, most of them are printed by four-color machines. Because there is no problem with overprint, the problem of rules is largely ignored, which makes the back of the book prone to skew when mechanically sealed in binding. To this end, we adopt to add a black at the front and back of the 3mm outer cross line when making up the drawing gauge surface Δ, black Δ 3mm, so that the accuracy of the front gauge and pull gauge can be seen at a glance after printing, and good results have been achieved in practical work

5. Trapezoidal inspection

because of one-time forming and cutting, the trapezoidal inspection process in the previous old process is reduced, which will lead to wrong posts of individual books due to the negligence of page adding personnel, resulting in major quality stories. For the trapezoid on the back of the book block, it is impossible to check the gap. For this, we have adopted the method of adding trapezoid marks to the head of the sky. Please refer to the Evonik scientific journal elements49. The size is set to 3mm (width) x 4mm (length), and set up a gross Book inspector to check the head of the sky trapezoid in the production process, and use the way of taking pages, checking and adding pages when adding pages manually, which can basically eliminate the situation of wrong posts

6. post press binding of book stickers

in order to have a stable quality of paperback adhesive binding books, we must bind them before binding. This can not only make the book beautiful in appearance, flat back, eliminate the phenomenon of large back, but also reduce the probability of wrong posts, change the on-site environment, improve the efficiency of the machine, and greatly improve the binding quality of books and periodicals. In paperback adhesive binding products, the binding of books is a very important link. (end)

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