BS ISO 16763:2016 pdf download – Graphic technology — Post-press — Requirements for bound products 4.5.1.2 Perfect binding In perfect binding, the folds of the gathered signatures shall be milled off. If single sheets are being bound, then they can be built up to form the block without the need to grind anything off. Depending on the paper thickness and the number of pages per signature, the depth of milling shall ensure the separation of the block into individual sheets. Notching and roughening may be applied to improve the adhesion. During all these processes the alignment of the signatures shall be kept. The milling shall be even across the spine. There should be no printing, varnishing or previously applied glue in the area reserved for gluing, which should also be free of dust. 4.5.1.3 Application of spine and side glue The coating layer of the adhesive should be bubble-free and uniform with a thickness in accordance with the technical specification of the glue manufacturer. The operating temperature of the adhesive and any other operational requirements shall be in accordance with the technical specification of the glue manufacturer. Glue penetration of more than 1,0 mm on a significant number of pages should be avoided. The thickness of the side glue should be kept as low as possible. Excess glue shall not be visible anywhere in the final product. 4.5.2 Thread sewing Thread sewing should be used for products of high durability, frequent usage and also for papers with a high basis weight. The thread used shall be stronger than the substrate. The stitches shall be evenly distributed on the spine fold. The stitching holes shall align with the centre fold with a deviation tolerance of ±0,5 mm. The tension in the thread should be such that the signatures are bound tightly together without there being any wrinkles or tearing. Any torn thread or missing stitches shall be avoided. Any signature of the thread sewn book block shall be aligned to the head with a tolerance of ±0,5 mm. For a good bonding of the signatures of a book block, the number of stitching groups should correspond to the spine length, the stitching arrangement in Table 2 is recommended. Staggered stitching should be used to avoid spine build-up, if necessary. The thread sewing process shall be followed by the process of gluing-off the spine. The requirements of 4.5.1.3 apply. 4.5.3 Thread sealing...
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