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Direct answer: The width of the side glue for regular 16 open books and magazines is 4-6mm, for 32 open books it is 3-5mm, and for large 16 open or thick books (book spine exceeding 20mm) it can be relaxed to 6-8mm. The width of the side glue should be “able to effectively grasp the cover fold without affecting the page flipping and spreading”.
The main force of wireless adhesive packaging comes from the back adhesive, and the responsibility of the side adhesive is to connect the cover and the two sides of the inner book sticker, preventing the cover from separating from the book block and the spine from opening when flipping through. It bears tearing and peeling forces. If the width is insufficient, it will open, and if the width is too large, the book will be flipped over unevenly and words near the spine will be “eaten” in.
| Format/Specifications | Suggested width of side adhesive | Side adhesive thickness |
|---|---|---|
| 32 open booklets | 3–5mm | 0.2–0.3mm |
| 16 regular books and periodicals | 4–6mm | 0.2–0.4mm |
| Big 16 Open Album | 5–7mm | 0.3–0.4mm |
| Backbone>20mm thick book | 6–8mm | 0.3–0.5mm |
| Textbook teaching aids (high-frequency reading) | 5–7mm | 0.3–0.4mm |
Many people only adjust the side rubber wheel, but in fact, there are three equally crucial variables: first, the position of the cover crease, and the offset of the indentation line will narrow the actual effective side rubber area; The second is the viscosity of the adhesive used for the side glue. If the viscosity is too low, it will be squeezed open during compression, resulting in the actual width exceeding the standard; The third is the clamping position of the book block. If the clamping is too deep, it will reduce the contact area of the side rubber wheel.
Most production lines are the same, which is also the most convenient approach. But for high-frequency reading of textbooks, teaching aids, or picture books with cover film, it is recommended to choose models with higher initial adhesion for the side adhesive – the film surface has poor absorption, and ordinary back adhesive is prone to false adhesion on the side, such as “looking stuck and tearing off”. Sunlife hot melt adhesive provides specialized high initial adhesion grades for laminated covers, which can be used in conjunction with conventional backing adhesives.
Q: Is the wider the side glue, the stronger the book?
Answer: No. After exceeding 8mm, the strength improvement is extremely limited, but it will significantly sacrifice the page flipping experience, and picture books will also block cross page images.
Question: Is the curling of the spine at both ends due to insufficient side glue?
Answer: Possible, but the more common reasons are insufficient opening time or too short compression time of the adhesive backing. It is recommended to investigate these two issues first.
Q: How to determine the width of the side adhesive for small-scale on-demand printing?
Answer: The paper and thickness of the graphic and text fast printing scene vary greatly. It is recommended to set it uniformly to 5mm for the best compatibility, and adjust it separately for special thick editions.
Guangzhou Sunlife Trading provides side/back glue matching solutions and machine parameter suggestions for book binding and graphic fast printing customers. If you need samples, please feel free to contact us at any time.
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