Creating a better wrapper
Coatings containing colloidal silica are used to enhance the function of plastic films, such as polypropylene, polyester, and other polyolefin. These films are often used for wrapping and protecting products, such as food and tobacco.
The plastic films industry uses a number of aqueous coatings that improve the functionality of oriented polypropylene (OPP) films. When coatings contain colloidal silica, some of the coatings’ drawbacks (e.g., poor block resistance) can be remedied.
Colloidal silica is commonly used as a “hot-slip agent” improving the movement of films over a heated surface, or platen, in a packaging machine. This enhancement is the result of increased coefficient of friction and better anti-blocking properties of the films.
When the coefficient of friction of plastic films is increased, their conveyance through various processing stations is easier. At the same time, thanks to the anti-blocking property of colloidal silica, films are less likely to adhere to hot surfaces, such as those found in filling machines.
Finally, colloidal silica can be used in latex emulsions to enhance the wettability and ink adhesion of water-based inks by controlling the hydrophilicity. This is particularly important because product labeling is often printed directly onto plastic films.
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We are here to help you to improve the efficiency of your plastic films. Please contact us for advice on which colloidal silica products are best for your applications.
|DID YOU KNOW?
Polypropylene is a commercial plastic that is tough and flexible; it can be made translucent, but it is not as transparent as other plastics.