Is the binding glue for books and periodicals not dry or firm? First, check the three items of paper, temperature, and adhesive amount

Description of the phenomenon

Adhesive bound books may not dry after being left for a while, the surface may become sticky, or the pages may open or fall off with a gentle flip of the inner pages – this type of; Unable to stick firmly; The problem is not that the glue itself is not good, but that several basic conditions are not well coordinated.

Three priority inspections

• Paper moisture contentThe paper is too wet, and the glue is not easy to cure and cannot bite the fibers. Damp paper and paper that has just been printed but has not dried should be controlled for moisture before binding.
• Low glue temperatureThe adhesive is not fully melted, with poor fluidity, insufficient penetration, and a virtual bonding surface. Adjust according to the type of adhesive to the recommended range.
• Insufficient/uneven glue applicationThe adhesive layer is too thin or broken, and there is not enough adhesive force at all; Check the liquid level of the glue pot, the glue roller, and the milling back.

Don’t miss it; Milling Back&# 8221;

The book block is not milled back or milled too shallow, and the glue only sticks to the surface, which can be easily opened when flipped over. Dropping pages often requires; Paper+temperature+glue amount+milling back&# 8221; Let’s look together, we can’t just blame the glue.

Processing sequence (suggestion)

1. Confirm that the paper has normal moisture content and has dried completely.
2. Adjust the glue temperature to the recommended range (do not exceed the upper limit).
3. Check and replenish the adhesive amount to ensure the continuity of the adhesive layer.
4. Check the milling depth and deepen or roughen it if necessary.

Scene Tips

When encountering books or magazines with missing pages or loose adhesion, first determine whether the problem lies in the back glue or edge glue station. The bonding of book cores mainly focuses on milling the back, adhesive temperature, adhesive amount, and matching of the back adhesive; The adhesive problem on the side of the cover belongs to the edge glue station. Do not mix different workstations together for judgment.

Frequently Asked Questions

Q: Do I have to change the glue if it doesn’t stick firmly?
A: First check the paper, temperature, glue amount, and milling back; In most cases, adjusting the parameters is sufficient, and changing the adhesive is the final step.

Q: How long will it take for the adhesive to fully penetrate?
A: Due to the influence of glue type, glue temperature, and paper moisture content, there is no uniform duration; Based on actual cooling and non stick properties, do not speculate on the exact number of hours.