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What are the factors that affect the viscosity of hot melt adhesive films

date:28-09-2020
Summary:

Under normal circumstances, if a casting hot fusible fi […]

Under normal circumstances, if a casting hot fusible film  customer reports that the effect of proofing is not very good, we generally start to investigate the cause from the operation link. Because most of the people in this situation are new to hot-melt adhesive films, their use is still limited to written knowledge and lack of practical experience. It is easy for the hot melt adhesive film to be insufficiently melted due to the operating temperature is too low, the pressure is too small, and the time is too short.

 

Casting Hot Fusible Film

 

 

If this is the case, the bond is not strong, you only need to debug the equipment according to the operating temperature, time and pressure reference values ​​required in the technical specifications, and test according to the actual situation to determine the compound conditions. If you can eliminate the problem of the operation link, then you have to check whether the wrong hot melt adhesive film model is selected.

 

Under normal circumstances, different types of hot melt adhesive films are suitable for different bonding materials. This is what we often say about material compatibility. If it is because the wrong hot melt adhesive film model is selected, just replace it with the correct hot melt adhesive film. As mentioned above, when troubleshooting the operation link, the temperature is too low will cause the bond to be weak. In fact, too high a temperature can cause weak bonding.

 

If the operating temperature is too high, the glue molecules will be degraded and no longer sticky. The same goes for returning to room temperature in time. It's just that this kind of situation is relatively rare. Under normal circumstances, as long as the operating temperature does not exceed the melting point of the hot melt adhesive film by more than 60 degrees, there is no problem.

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