Book covers material selection and the quality of the relationship between India and post-bindingBook covers material selection and the quality of the relationship between India and post-binding
There are many books printing on the cover on the absence of selection, taking into account the difficulties of processing and effect, causing all kinds of quality problems, some cases are listed below, please analyze.
1. Paper and paper book covers the core thickness of the poor
In order to decorate the appearance of books to improve the binding effect of books, there are now many books on the cover thickness and the core text of the book are significant differences between the quantitative paper, books, bound volumes, after pulling that much difference between the two, the wireless Adhesive set, the off cover Bian Jiang pulled off the first page of the book reveal the core rubber-soled or pull out pages, resulting in substandard goods, so that publishers and processing of those contradictions. When such products can be added between a quantitative one-liner or a moderate lining ring will be evenly distributed pull these problems can be solved, but publishers often do not do this considerations; In addition, the cover indentation , it will be more pressure could also be resolved this issue,
But it appears easy to press down, crush phenomenon.
2. Cover creases caused by improper design and choice of material fracture
Now the thickness of the book covers an increasingly large quantity in the paper 200g/m2 or 250g/m2 cardboard, folded to be increased in the design process before the mouth, and the results are: (1) The former mouth creases fracture, imprinting damage Lu paper at the end, undermine the quality of books now; (2) more than 200g/m2 paper basis weight in the mouth before the binding of the cover off a very difficult time, the machine is unable to accurately indentation, hand to scratch a picture and can not guarantee the quality, the results of Also caused by substandard materials are present.
3. The length of the book cover is shorter than the length of the core caused by dirty book
Publishing units in the design of the cover is usually longer than the book cover core length of about 7mm shorter, wireless Adhesive coated gum package provides cover when the back end of the book (gross gate) glue exposed when the package is delivered after the cover exposed The glue to stay in the conveyor belt or the next book will be written dirty board. Now publishing house design cover, 32 to open the following is basically double, and two cover designs with bridging Department did not leave the CD copies, an entire spare no pains to cover up and down. I do not know this practice in order to save paper, or do not understand binding process. If the design is given the length of hair the size of the book (each foot can be more 7mm), with a dirty, dirty book phenomenon can be fully resolved,
But the problem has continued for several years have fallen on deaf ears.
4. Designs spare no pains to cause irreversible process
Some of the United States prepared to design the cover of some larger version of color box, without considering the difficulties of binding, do not understand after the binding of the Indian national quality standards, resulting in binding when not produce the desired results. For example: to binding a paperback book (wireless glue stick set), thickness 12mm, spine part of the design for the whole white on black, front and back cover for the full version of black on Yu Bai, require longer working hours can not be Loubai Cover , the spine can not be black, this requirement is too difficult. CY/T288-1999 binding in accordance with national quality requirements and test methods - paperback 3,4,5 reads: "Spine word translation error to the book back centerline prevail
The book thickness of 10mm and 10mm back below the finished book, the word spine shift tolerance ≤ 1.Omm; book back thickness is greater than 20mm and less than or equal to 30mm of the finished book, the word spine shift tolerance of 2.5mm ";" crooked spine characters word translation of tolerance than that of the tolerance spine small 0.5mm ". according to the required thickness of 12mm the book back tolerance should be ≤ 1.2mm, but the design of such a black and white, for the processing of those" black is not on the white, white and black do not reveal "requirements, how can it do?
5. "Lu in blood" is more difficult to process by binding
There is a book called "Lu in blood", that is bookbinding processing finished cutting, the requested version of box-prints exposed at the incision lines, in the cut part of the formation of a straight line pattern. This process has to go through folding, stick, with, bag, cut, the exposed prints neatly in a straight line processing.
