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The hot melt adhesive particles used for sealing can be initially cured in only 3-8 seconds from coating to reaching transportable strength, and fully cooled and set in about 20-30 seconds. Compared to water-based adhesive, it takes a few minutes to wait, which is why hot melt adhesive is irreplaceable on high-speed sealing lines. Below, use a checklist to clarify the key points at once.
| Scene | Initial solidification time | Suggested adhesive type |
|---|---|---|
| Automatic sealing of e-commerce small items | 2-4 seconds | Quick fix sealing box particles |
| Heavy duty corrugated stacking box | 5-8 seconds | High initial viscosity particles |
| Handmade framing of gift box heaven and earth cover | 8-15 seconds | Medium temperature universal particles |
Q: Does fast curing mean it sticks firmly?
Answer: Not necessarily. Fast initial solidification is beneficial for the production line rhythm, and the final fastness depends on the penetration and cohesive strength. Sunlife hot melt adhesive’s sealing particles balance both.
Q: Why does it solidify faster in summer and slower in winter?
Answer: Low temperature substrates absorb more heat, and the adhesive layer dissipates heat quickly but lacks penetration, resulting in “false solidification”, which requires insulation or fine adjustment of the adhesive temperature.
Q: Can it be re pressed and re bonded after curing?
Answer: The cooling of hot melt adhesive is irreversible, and when opened, it needs to be reheated and coated again. It cannot be repeatedly applied like tape.
Guangzhou Sunlife Trading can recommend Sunlife hot melt adhesive particles with corresponding curing speed according to your sealing cycle, and provide small samples for machine testing.
Matching principle in one sentence:The faster the machine speed, the faster the required curing and the shorter the opening time; If the machine speed is slow or the workpiece is large and needs to be aligned over a long distance, it should be fixed and opened slowly insteadChoosing the wrong direction is either due to […]
Answer directly UnopenedHot melt adhesive granulesIt can usually be stored for 12-24 months in a cool and dry place; Once opened, it is recommended to use it within 3-6 months. Whether it is sealed or not directly determines whether the rubber particles will absorb moisture, clump, and decrease in performance. Sealed storage vs open storage […]
Universal hot melt adhesive granulesCan be reluctantly shared in scenarios with small batch and low strength requirements through “gluing+sealing”However, when it comes to large-scale production, it is recommended to separate materials: the adhesive packaging of books and periodicals should have penetration and stiffness, and the sealing should have initial adhesion and tensile strength; Carrying a […]
The significance of surface treatment to the bonding strength of hot melt adhesives: The quality of surface treatment is often the key to determining the success or failure of a good adhesive joint. This is because the wettability of the adhesive to the surface of the adherend and the intermolecular forces at the interface (i.e., […]
