The degumming of hot melt adhesive when it meets water after bonding depends on the specific properties of the adhesive and the conditions in which it is used. Some hot melt adhesives may lose their bonding strength and degrade when exposed to water or high humidity, leading to degumming or delamination of the bonded materials. This is more likely to occur with adhesives that have poor water resistance or are not specifically designed for use in wet or humid environments.
Not like some TPU hot melt adhesives that are specifically formulated to have good water resistance and are suitable for use in wet or humid environments. These adhesives are typically made with materials that are more resistant to water and moisture, such as polyurethane or thermoplastic elastomers.
Comparison about PA, PUR, EVA type of adhesives / adhesives film Roll :
PA (Polyamide) Adhesives:
- High melting point and high viscosity, which can make them difficult to process
- May not be suitable for use in wet or humid environments due to poor water resistance
- Can sometimes be brittle and prone to cracking under stress
PUR (Polyurethane Reactive) Adhesives:
- Longer curing time and higher processing temperatures compared to some other adhesives
- May require specific environmental conditions, such as moisture, to initiate the curing process
- Can be more expensive than some other types of adhesives
EVA (Ethylene Vinyl Acetate) Adhesives:
- Lower bonding strength and durability compared to some other adhesives
- May not be suitable for high-stress applications
- Can be prone to yellowing over time due to UV exposure, which can affect the appearance of the bonded materials.
It’s important to note that When choosing an adhesive, it’s important to carefully consider the requirements of the application and to consult with the manufacturer or a knowledgeable expert to ensure that the adhesive will be suitable for the intended use.
To prevent degumming of hot melt adhesive when it meets water after bonding, it is important to choose the right adhesive for the specific application and to follow the manufacturer’s instructions for use and storage. It is also important to ensure that the bonded materials are clean and dry before applying the adhesive, and to allow sufficient time for the adhesive to cure and reach its full strength before exposing it to water or high humidity.