What are pressure sensitive hot melt adhesive particles suitable for? Comparison and evaluation with ordinary hot melt adhesive particles

The core feature of pressure sensitive hot melt adhesive granules (HMPSA) isAfter cooling, it still maintains long-term adhesion and can be bonded by finger pressure, and can be repositioned within a certain period of timeIt is mainly used in scenarios that require “re pasting” or “to be pasted”: sealing strips for express bags, easy to tear seals for cardboard boxes, label stickers, temporary fixing of gifts, attachment pasting of book and magazine pages, etc. And ordinary structural hot melt adhesive particles solidify upon cooling, and the bonding is irreversible, responsible for true load-bearing bonding, such as book and magazine backing adhesive, glue box, and box sealing.

Comparison of core differences

Explain each applicable scenario one by one

• Self adhesive sealing for express bags/document bagsThe mainstream method of e-commerce packaging is to apply release paper on top of the sealed flip cover, which can be peeled off by the user to bond.
• Easy to tear zipper strips on cardboard boxesIt needs to be easy to open the box and cannot be scattered during transportation. The combination of pressure-sensitive and structural partition has the best effect.
• Fixed book and magazine pages and giftsPostcards and sample bags in magazines are required to be removable without leaving any residue or damaging the paper surface.
• Labels and stickersThe conventional field of coated pressure-sensitive adhesives requires a high balance between initial adhesion and holding adhesion.
• Temporary binding of exhibition brochureIn situations where on-site page adjustment is required, pressure-sensitive adhesive provides rework space.

Three situations where pressure-sensitive type is not suitable

One is the bonding of load-bearing structuresFor parts that require long-term peeling force, such as spine and back glue, and hardcover book cases, pressure-sensitive adhesives will slowly creep and eventually detach.The second is the high temperature environmentDuring high temperature storage or vehicle transportation in summer, the pressure-sensitive adhesive layer is prone to displacement and oil leakage pollution.The third is finished products that have been stored for a long timePressure sensitive adhesives may undergo slight oxidation and viscosity degradation over time, making them unsuitable for products with long inventory cycles.

What indicators should be considered when selecting a model

• Initial adhesion (rolling ball method)Deciding on the “one press, stick” feel.
• Stick (holding force)The ability to determine long-term non slip often fluctuates with initial adhesion.
• 180 ° peel forceDeciding on the feel and residue of the adhesive when torn apart.
• Coating temperature and viscosityAffects the ability to apply glue normally on existing equipment.
• Migration resistanceWhether it will leak oil and turn yellow when applied on paper is particularly important for food packaging.

Frequently Asked Questions

Q: Can pressure-sensitive and regular types be interchangeable on the same device?
Answer: It is generally not recommended. The pressure-sensitive viscosity curve and coating temperature are different, and residual in the pot will contaminate the subsequent structural adhesive. It is best to use a dedicated machine or thoroughly clean the pot before switching.

Q: Will the stickiness of pressure-sensitive type disappear over time?
Answer: It will slowly decay, especially in high temperature and high humidity environments. It is recommended to follow the first in, first out principle by batch to avoid long-term inventory.

Question: How do I determine which product to use?
Answer: Just one question is enough – is this adhesive “to be torn apart” or “cannot be torn apart”. To tear open, choose pressure-sensitive type, not structural type. Guangzhou Sunlife Trading can match models from Sunlife’s hot melt adhesive product line and provide samples for actual testing based on specific packaging forms and tear off feel requirements.