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32 double book binding
32 pairs of books, in the past when the wire is generally used when the first day of the peace 4mm, 6mm in the seam, 2mm foot cut, in the three-cutting machine, use the dual push book car to complete the previous and next Cut separately. In the adhesive bonding production process, using the above operations, it will produce a lot of days, breaking the ground.
This is mainly due to the hot-melt adhesive curing, the overall hardness is much greater than the previous hot pack books, in the process can only take the method of sawing the knife, the first double-bonded wireless glue book is divided into two before Cutting, and saw blade thickness, usually about 3mm, if you still use the size of the previous incision, it is obviously difficult to achieve the cutting requirements, if you add the size of the middle seam to 9mm, lithographic products due to the edge and rinse Occupied by the size, the printed product is incomplete. According to the actual situation, the size of the middle seam can be set to 8mm, which not only guarantees the integrity of the printed product at the time of printing, but also ensures the quality of the bound and cut.
Milling back thickness design
In order to ensure that the signature can be completely milled at the milling cutter, the thickness of the general milling back is 2 to 2.5 mm, and the thicker books and magazines can reach 2.5 to 3 mm, while the coated back thickness is generally 0.6 to 1.2 mm. The average back-to-back thickness is 2.5mm, the average thickness of the coating is 0.9mm, and the size of the normal outside cut is 3mm. For example, the external cut after milling is only 1.4mm. If the normal folding tolerance is generated, the outer cut may shrink. Page phenomenon; If only the folding size is enlarged, there will be serious deviations in the layout of the mind, the edition of the mind and the contiguous page number exceeds the standard, which will cause great inconvenience to the reading and will also seriously affect the aesthetics of the book binding. If you want to pre-add 1.5mm milling mouth at the milling back when you make an imposition, this will ensure the cutting size requirements, eliminate the shrinking phenomenon, and will not affect the aesthetics of the book.
Order problem
Some people think that glue books do not have an order, so the final version of the finished book is not centered on the layout. This problem is especially noticeable in practical work, especially in books with title pages. This is mainly due to the fact that it is not possible for adhesive-bonded books to bind books like a sewing thread. They can open the book pages to the back of the book, because the depth of draw grooves for paper-adhesive books is generally 1.0 to 1.2 mm. The author concludes in practice that when the mouth is set to about 3mm, the center of mind is exactly centered, which is basically in line with the dimensions of the milling back and the groove.
The book is not centered
It is a very vexing problem that gum-book books are not centered on the back of the book. This is a prominent problem that arises from the development of hand-packed books to mechanized bags. In the past, many single- and dual-color offset printers used to print the covers. Due to overprinting problems, the machine attached great importance to the front gauges and pull gauges. Nowadays, due to the continuous transformation of equipment, the market is pursuing a short cycle, and the requirements for cover matching are fast, so most of them are printed on a four-color machine. Since there is no problem with overprinting, this largely ignores the issue of rules, making Book backs are prone to skew when mechanically sealed in bindings. For this reason, we have adopted a black â–³ before and after 3mm of the outer reticle at the time of imposition of the pull gauge surface, and the black â–³ is 3mm, so that the printed product will be able to see the accuracy of the front gauge and the pull gauge at a glance. Has also achieved very good results.
Trapezoidal inspection
Because the glue-adhesive books were cut by a single molding process, the trapezoidal trapping process in the old craftsmanship was reduced. This resulted in the misprinting of individual books due to the oversight of the pagers, resulting in a major quality story. As for the trapezoid on the back of the book core book, it is impossible to perform interstitial inspection. For this, we have adopted the sky-headed plus trapezoidal method. The size of the heavenly trapezoid is set to 3mm (width)×4mm (length), and a hair is established. This inspector checks the trapezoidal trapezoids during the production process, and uses the page search method to add pages when manually adding pages. This can basically eliminate the situation of the wrong posts.
Post-print binding of signatures
In order to have a more stable quality for paperback glue books, binding before binding must be done. This can not only make the book beautiful appearance, back to the book, eliminate the phenomenon of large books back, but also can reduce the probability of misprints, change the site environment, improve the efficiency of the use of the machine, can greatly improve the bookbinding quality. The binding of signatures is a very important link in paperback glued products.
Guaranteeing Bookbinding Quality from Product Design
Stapling is not an isolated processing procedure. Many irrational steps in the process will bring difficulties to the binding. Therefore, from the beginning of product design, it is necessary to push back the process forward with the binding requirements.