What type of hot melt adhesive particle adhesive aluminum foil coated paper is used? Choose the right adhesive type to bond firmly and not fall off

Why is it harder to bond aluminum foil coated paper than regular paper?

Aluminum foil coated paper has a layer of metal film on its surface, which is dense, smooth, and has low surface energy,Hot melt adhesive granulesIt is difficult to wet after coating, and the initial adhesion is much lower than that of copperplate paper or kraft paper. Many packaging factories have reported that “even when the temperature is high and the amount of glue applied is sufficient, it cannot stick”, and the fundamental reason is that the glue type is incorrect – the universal EVA hot melt adhesive particles have insufficient affinity for low surface energy materials, and high adhesion specialized models need to be selected.

What hot melt adhesive particles should be selected for aluminum foil coated paper?

It is recommended to use modified EVA or APAO based hot melt adhesive particles with a higher proportion of tackifying resin. This type of adhesive has a moderate softening point (80-95 ° C), a slightly longer opening time, and can be fully wetted on the aluminum foil surface before curing. The peel strength can reach 4N/cm or more. Sunlife hot melt adhesive has launched a special model for aluminum foil coating scenarios. After testing by multiple cosmetics box factories, the bonding strength has increased from 60% of universal adhesive to over 95%.

• Recommended coating temperature: 170-180 ° C, 10 ° C higher than conventional to improve flowability
• Compression time: 2-4 seconds, slightly longer than regular cardboard box sealing
• Glue application amount: 45-60g/m ², slightly increased to ensure contact area

Frequently Asked Questions

• Q: What should I do if the aluminum foil coated paper opens the next day after being glued?
  A: Most likely, the opening time is too short and the adhesive has not fully soaked before it solidifies. Switch to a model with an open time of 3-5 seconds and increase the coating temperature appropriately.
• Q: Can we use ordinary sealing rubber particles to apply pressure to solve the problem?
  A: Pressurization can only improve contact and cannot solve the problem of wettability. It is necessary to switch to a high adhesion specialized model to address the root cause.
• Q: Do you have aluminum foil specific samples for Sunlife hot melt adhesive that can be tested?
  A: Yes, there is. Guangzhou Sunlife Trading provides free sample shipping service, with a minimum weight of 1kg for testing. It is recommended to conduct small batch verification before making bulk purchases.