Inspection checklist for hot melt adhesive particle sampling of book and magazine packaging: 7 items that must be checked before quantity release

What do we need to inspect when replacing the adhesive particles for book and magazine packaging and making samples?

Directly provide the list: When changing the glue or selecting a new supplier, a sample must be made and checked before formal productionAdhesive strength, page flipping flatness, appearance of book back, temperature resistance, opening time, odor, batch COAThese 7 items. Skipping sampling and directly getting on the machine is the most common reason for book and magazine factories to overturn. The following acceptance checklist is organized by Guangzhou Sunlife Trading and can be directly printed and pasted on the sampling station to check each item.

7 Acceptance Checklist

1. Adhesive strength (tear off test)Randomly draw books and forcefully flip them over. If the paper is torn and the glue seam cannot be opened, it is considered qualified; Overlapping pages directly results in disqualification.
2. Page flipping flatnessWhether the book can be spread flat and whether the flipping is tight directly affects the reading experience and customer complaints.
3. Book back appearanceWhether the adhesive layer is uniform, whether there is adhesive overflow or adhesion, and whether there are white spots or bubbles.
4. Temperature resistance testPlace the sample book in a 50 ℃ oven and refrigerate at -5 ℃ for 4 hours each to check for glue overflow or cracking.
5. Match opening hoursCheck if the speed of the glue binding machine matches, and do not dry before pressing.
6. odorWhether there is a pungent odor when turning on and writing books, especially for children’s textbooks with low odor.
7. Batch ConsistencyRequire suppliers to provide COA for each batch, such as Sunlife hot melt adhesive with accompanying testing data.

Parameter Quick Reference Table

Frequently Asked Questions

Q: How many samples are representative?
It is recommended to have at least 50 volumes and cover different paper and page thicknesses; The randomness of only trying three to five sets of data is too high.

Q: What if the sample is qualified but the page drops during mass production?
Mostly due to temperature or speed drift during mass production, check whether the glue application temperature and binding speed are consistent with the sampling. Sunlife hot melt adhesive can assist in on-site parameter adjustment.

According to this list of 7 items, each item will be inspected and accepted, and there will be basically no batch accidents when changing the glue for book and magazine packaging.