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One sentence distinction:Initial adhesion refers to whether one can grasp it at the moment of attachment, while holding adhesion refers to whether it can be firmly held for several months.The adhesive packaging of books and magazines places more emphasis on adhesion, while high-speed sealing places more emphasis on initial adhesion. The two often have a trade-off in formula, so when selecting, it is necessary to first clarify the process rhythm.
| Comparison item | Initial tack | Adhesion force |
|---|---|---|
| Action time | Within 1-3 seconds after gluing | Months to years after the finished product leaves the factory |
| influencing factors | Opening time, melt viscosity, wax content | Molecular weight and cohesive strength of basic resin |
| Performance that does not meet the standards | The cardboard box rebounds and opens, and the book pages are not tightly pressed | The spine of the book cracked, and the cardboard box opened during transportation |
| Typical verification methods | Finger press for 3 seconds to tear open and see the fiber damage rate | Perform peel test after being stored at room temperature for 30 days |
Packaging factories pursue production line speed and tend to choose models with short opening times and extremely high initial adhesion. As a result, in winter, the adhesive layer becomes brittle, and cardboard boxes are opened in batches during the cold chain; On the contrary, book and magazine factories chose glue with high cohesive strength but long opening time to make the spine resistant to folding. As a result, the high-speed glue binding machine entered the next workstation before the book pages were fully formed, resulting in loose pages. This is not because the glue is not good, but because the indicators do not match the rhythm.
Sunlife Commercial Supply of Guangzhou Sunlifehot melt adhesiveThe factory report will simultaneously indicate four items: softening point, melt viscosity, opening time, and curing time. Customers can infer the bias between initial adhesion and holding adhesion based on this. For production lines with special rhythms, we recommend running a full shift of 25kg trial packs, verifying with real paper and real workshop temperature, and then determining the annual model.
Q: Is it better to have a higher initial adhesion force?
Answer: No. Excessive initial adhesion is often accompanied by a short opening time, and manual operation or long glue line equipment is more likely to break the glue.
Q: How to easily determine whether the adhesive strength is sufficient?
Answer: After placing the finished product for a week, manually tear it open. If the paper fibers are torn, it indicates that the adhesion is stronger than the paper itself, which is a qualified state.
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