In a broad sense, greaseproof paper refers to paper that can prevent grease from absorbing and penetrating. In a narrow sense, it refers to a type of paper made from bleached, semi-bleached or unbleached chemical wood pulp through high-beating treatment. It also includes paper types that are produced by adding anti-oil agents in the pulp or coating the surface to resist oil penetration and absorption.
The basis weight of greaseproof paper can be as low as 20g/m2, depending on user requirements. It has a certain strength and higher smoothness, but has lower breathability. This kind of paper has many fiber bonding points due to the strong beating effect on the fibers. The porosity of the paper page is very low and the transparency is high. Therefore, the penetration and absorption of oil can be prevented.
It is made from chemical wood pulp that is highly viscous and beaten, and then made on a Fourdrinier paper machine, or it is coated with oil-resistant coatings (casein type, varnish type, hot melt or resin type, silicate type).
Greaseproof paper is widely used for packaging of hamburgers, baked bread, biscuits, and other foods and other oil-containing items.
