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Direct answer: The impact is significant. The direction of the book page threads should be parallel to the spine (straight), so that the paper is less likely to arch along the spine, the adhesive layer is evenly stressed, and the folding life is significantly longer; Books bound with horizontal threads have high page turning resistance and a spine that is prone to waves. SimilarlyHot melt adhesive granulesThe fastness performance may differ by more than half.
The root cause of many page dropping problems is not in the binding workshop, but in pre press typesetting and paper opening. In order to save paper, the direction of the threads was reversed, and there was no problem in the previous process. It was only during the gluing process that the explosion occurred. The binding master can only rely on adding glue and pressure to remedy the situation, and the cost has increased, but the fastness is still unstable.
| Comparison item | Shun Si (silk strands parallel to the spine of a book) | Horizontal silk (silk strands perpendicular to the spine) |
|---|---|---|
| Flip feel | Smooth, can be spread evenly | The rebound is large, and it needs to be pressed firmly |
| Spine morphology | level | Easy to cause waves and bulges |
| Adhesive layer under stress | uniform distribution | Concentrated at the end of the crease |
| Moisture absorption deformation | Lateral expansion with minimal impact | Vertical expansion, directly on the spine of the book |
| Folding test | Usually stable through | Easy to open the adhesive at the end first |
When Guangzhou Sunlife Trading receives feedback that “the spine of the book swells and opens with just a few flips,” they usually ask the customer to confirm the direction of the threads first. If it is indeed a horizontal thread and cannot be adjusted in the short term, it is recommended to use Sunlife hot melt adhesive with better flexibility for transition. At the same time, it is recommended to correct the next batch from the paper opening stage – using adhesive to fill the process holes, which can partially fill, but not completely.
The impact is smaller than that of glue binding, but the finished product bound along the thread is also smoother, especially for thicker booklets.
The moisture absorption and expansion directions of different pages are not consistent, and the finished product is prone to wave deformation. It is recommended to keep the same direction on the pages of the same book.
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