Photography Hardcover Book Printing in China: (1) A4 size, portrait format. (2) Smythe sewn binding. (3) Hardcover binding cloth over 3mm grey board as case with gold foil stamping, 157gsm glossy C2S for text, 120gsm white regular uncoated wood free paper as endpaper. (4) CMYK printing and alternative glossy varnish flood coating extra on text body. (5) Loose back, square or round back, H/T band.
When you want to know more about paper parameters during the process of designing a hardcover book, or try to match paper quality with last edition, you should get something more about these parameters. Here we would like to introduce some for your reference.
(1) For a hardcover book printing job, the grey board is needed. Here we list the converting between different weight and thickness systems.
(2) PPI means pages per inch, which is to define the thickness of paper. If you try to make your book thickness in certain range, you shall pay more attention to the PPI, which is useful for thin book printing jobs.
(3) There are three more systems of unit normally used to define paper thickness, gsm, pt and lb. PT is normally for paperboard, you can find the converting between pt and gsm for ardcard.
LB means one ream paper weight in size 25" x 38", such as 57lb paper is equal to 500sheets x 25" x 38" x 85gsm / 0.4536. Some normal useful converting formula is listed as below.
(4) Opacity and Brightness are two parameters to indicate paper quality. When the opacity is high, you can not find fiber grain from opposite side. Brightness is important to print wide range tones images, high brightness paper is helpful to perform shinny or heavy coverage ink.
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Here we paste two illustration pictures to show more information about hardcover book structure. Hope they can help to explain paper parameters further.