The friction coefficient increases after solvent compounding, especially when the material is a composite film with a PE thickness of less than 45μ. What factors are related to the increase in friction coefficient? This article analyzes.
The current high-speed automatic packaging requires that the film has a small friction coefficient (for automatic packaging, it is precisely the friction coefficient between the composite film and the mechanical guide rollers, forming steel plates, rather than simply referring to the inner layer and inner layer of the composite film Coefficient of friction between layers) to reduce the transport resistance of the film.
However, according to the general reaction in the industry, there is a significant increase in the coefficient of friction of the solvent-free composite film after aging, especially the composite film with a PE thickness of less than 45μ. At the same time, the same PE inner membrane is compounded by the traditional dry method, but there is no similar problem.
Obviously, the increase in friction coefficient is related to the characteristics of solvent-free adhesives. There is a view that "MDI-type isocyanate compounds will gradually migrate to the surface through the inner film and react with water vapor to form polyurea anti-heat seal. The layer "slip agent migrates into the adhesive layer", it can be seen that the matching test of the specific adhesive model and the inner film is the key link to avoid similar quality problems.
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