Phenomenon of increased coefficient of friction of laminated products 2
The increase of friction coefficient of composite film often occurs in the composite structure with PE, CPP film as the heat sealing layer, especially when the heat sealing layer is thinner, it is more likely to occur, which also results in the result that the smoothness of composite film is not good after curing or affects the openness of the bag after making.
1. Causes
The heat sealing film material itself is not enough to add smooth agent, the film itself is not good smoothness.
Solvent-free adhesive contains a pre-polymer as a “polyether” component, it is in contact with the film, under certain conditions will react with the film in the smooth agent (the intensity of the reaction has a greater relationship with the temperature), excessive consumption of film in the smooth agent, resulting in an increase in the coefficient of friction of the composite film, smoothness is not good.
Smooth agent in the main component - amine and solvent-free adhesives in the NCO component (A glue) reaction (the formation of urea, and then the formation of polyurea), the film in the smooth agent is too much consumption, resulting in increased friction coefficient of the composite film.
2、Measures to prevent or improve the increase of friction coefficient of composite film
According to the order from easy to difficult, can use a variety of initiatives to solve or improve:
In order to meet the peel strength as well as to ensure that the premise of not out of the point, appropriate reduction in the amount of adhesive coating (close to the critical);.
Appropriately reduce the operating temperature and control the curing temperature (e.g., ordinary compounding 33 ~ 38 ℃), in the summer time can be considered room temperature curing;
Procurement of smoothness of better film (or blowing film to increase the amount of smooth agent added).
Choose a more suitable brand or model of adhesive.
Appropriately reduce the laminating film winding tension.
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