Does the direction of the threads on the adhesive paper affect the fastness of the hot melt adhesive particles? Comprehensive comparison between straight and horizontal threads

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.

Industry Status: The direction of silk threads is often predetermined during the typesetting stage

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 between straight and horizontal threads

How to quickly determine the direction of silk strands

• Tear off paper methodTearing in the direction of the thread is relatively straight, while tearing in the direction of the thread is hairy and curved.
• Nail scratch methodLightly swipe in two directions, and the side with obvious wrinkles is a horizontal thread.
• Moisturizing methodWhen one side of the paper sample is wet, it will curl in the direction of the silk strands.
• Look at the paper mill logoThe number of openings and threads are usually marked on the packaging of the whole paper, which is the most convenient to check when feeding.

It’s already a horizontal thread. How can we remedy it

• Choose hot melt adhesive particles with better toughness and higher elongation, so that the adhesive layer can rebound with the paper instead of being torn.
• Appropriately increase the width of the side adhesive to distribute the force to the cover.
• Control workshop humidity to reduce additional stress caused by paper moisture absorption and expansion.
• Increase the pressing time for the thick layer to fully shape the adhesive layer.

Suggestions for Sunlife Hot Melt Adhesive

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.

Frequently Asked Questions

Do we also need to pay attention to the direction of the threads when riding a horse stud?

The impact is smaller than that of glue binding, but the finished product bound along the thread is also smoother, especially for thicker booklets.

What will happen to the inner pages mixed with different threads?

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.