subject: Famous Forum: The Thickness Of The Back Calculation And Design - Binding, Paperback, The Thickness [print this page] Work in the practice of publishing and printing, publishing and printing I often encountered the Design , And process the thickness of the back were asked the question, also see the back of some books there is not in the middle of the text or the phenomenon of small map. This shows that the accurate calculation of the thickness of the back, the design of the back side, there are still some problems are only in respect personal experience and understanding, some observations for your reference. I always thought there are two, one as far as possible to obtain accurate thickness of the back, one at the back are not accurate thickness of the case, as far as possible from the design to cover up and make up.
One, the back thickness of the theory of computation
1. General Paperback calculate the thickness of the back
Theory, the back of a book thickness is equivalent to the thickness of the book. The thickness of the book should be equal to the thickness of the book and all the pages. If this book is only printed the same paper, the book thickness of a sheet of paper thickness = value * the number of sheets (or page number / 2).
As assumptions: a book in a paper printed with 55 grams, the total page number is 512P, the thickness of each piece of paper is 0.08mm. Then, the thickness of the book A = 0.08mm * 512 / 2 = 20.48mm.
If two or more of the paper printing, put the thickness of various paper with the above formula are out, then you can add a variety of paper thickness.
Assuming a book B, ibid case of a body of paper, color paper insert with a 128 g copper, 160 page numbers, the thickness of each sheet of paper is 0.1. Then, the book thickness of B = 20.48 +0.1 * 160 / 2 = 20.48 +8 = 28.48mm.
2. Hardcover calculate the thickness of the back
1) side (flat) back back thickness = hardcover paperback book (the book center) thickness + thickness of the lining around the ring (the thickness of each ring mount * 4) + cardboard thickness (each cardboard thickness * 2) + book shell fabric thickness (the thickness of each fabric * 2). Suppose a book
C, the thickness of the book Heart Ibid cases B and lining around the ring with 180 g offset paper, each sheet of paper thickness is 0.15mm, 2mm thick book with a cardboard shell, shell fabric and coated book paper Each is the thickness of 0.3mm. So. This book is thick C = 28.48 +0.15 * 4 +2 * 2 +0.3 * 2 = 33.48mm.
2) the thickness of the round back hardcover book actually refers to the back of this hardcover book circle arc length value. This situation generally circular arc of 120 degrees, and the arc corresponding to the chord is a straight line this hardcover book thickness (the thickness of the back side), at this time and the arc chord ratio is 1:1.15. Suppose the example
C Zuocheng hardcover hardcover small round back, the small thickness of the book thickness of C = hardcover book * 1.15 = 33.48 * 1.15 = 38.5mm.
Second, the book value of the actual calculation of the thickness of the back
1. Theoretical data are consistent with the actual values, the key is the thickness of each sheet of paper manufacturing error with the theory. Awareness of this issue should be as follows:
1) paper developed countries and regions outside the standard of tolerance and the actual errors are small, but within the tolerance and the actual error are quite large.
2) page of a book a few more, then the entire book, the greater the accumulation of errors. So we can not provide the paper mill theoretical thickness of the subject, to the product measured. Is to actually measure the thickness of a single white sheet of paper thickness basis.
2. The actual measurement when white, should be small in big demand, reduce errors, such as the best measure 2 reams of paper, the measurement can be reduced 1000 times.
