1.A great effect on the smoothness of PE film
When the solvent composite ripening temperature is greater than 40 ° C, it has a great effect on solvent-free composite film which has the inner layer of a PE film, and it is easy to appear the phenomenon that friction coefficient increases obviously. This is mainly because the higher the ripening temperature, the more intensely moved the molecular motion of the PE film, which is easy to migrate to the adhesive layer and the reaction is consumed, resulting in the increasing friction coefficient of the composite film.
2.Aluminum plating layer transfer
Aluminum plating film, especially a polyester plating aluminum film, is prone to aluminum transfer during the solvent-free composite, thereby causing insufficient strength of the composite film peeling.
3.Dissolve with ink
During the solventless composite, the phenomenon of adhesive and ink phase dissolution may occur, especially the dye-type ink.
4. Low peel strength of aluminum foil composite
At present, for the solventless composite of the aluminum foil, since the peel strength is not enough, it is still necessary to satisfy the heavy-duty packaging and requirements for cooking resistance.
5. Frequent replacement of solventless adhesive types
With the development of the solventless composite process, many solvent-free adhesive suppliers have introduced general solvent-free adhesives, cooking solvent-free adhesives, aluminum foil special solventless adhesive, low friction coefficient no solvent adhesive, etc. Although the diversification of the product can meet the composite requirements of different materials, the flexible packaging company also has to clean the gluing equipment and solventless machine according to the different composite materials. Not only it wastes time, human resource, financial, but also has low production efficiency.
https://www.sinstarsl.com/articles/detail/an-article-to-learn-the-advantages-problems-and-development-trend-of-solventless-adhesives.html
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