What is Greaseproof Paper?
Greaseproof paper, as its name suggests, is paper that is impermeable to oil or grease. It is typically used in food packaging and handling due to its unique properties. However, it's important to note that greaseproof paper is not suitable for baking or high-temperature applications because it is not heat-resistant. Here's a closer look at its production process, characteristics, and versatile applications.
1. Production Process
Greaseproof paper is usually produced by refining the paper stock further. This refining process creates a sheet with very low porosity, making it highly resistant to absorbing fats and oils. The refined paper is then passed between hard pressure rollers (supercalendered) to further increase its density. This results in a paper called glassine, which is known for its smooth, glossy surface and high density.
To enhance its grease resistance, the glassine is treated with starches, alginates, or carboxymethyl cellulose (CMC) in a size press. This treatment fills pores or chemically alters the paper to make it fat repellent. The basis weights of greaseproof paper typically range from 30 to 50 grams per square meter, making it lightweight yet durable.
2. Grease Resistance Levels (Kit1-Kit7)
Greaseproof paper is categorized based on its grease resistance levels, ranging from Kit1 to Kit7. The higher the Kit number, the more resistant the paper is to grease and oil. This classification system allows chefs and food handlers to choose the right type of greaseproof paper for their specific needs, ensuring optimal performance and results.
3. Common Uses in Food Packaging
Due to its grease-resistant properties, greaseproof paper is frequently used in food packaging. It is ideal for wrapping sandwiches, burgers, and other greasy food items, as it prevents the food from soaking through the paper and making a mess. Additionally, it serves as an excellent barrier against moisture, further preserving the quality of the food.
4. Non-Culinary Applications
Despite its primary use in food packaging, greaseproof paper can also be found in other non-culinary applications. It is sometimes used as a protective layer in art and craft projects, particularly those involving paints or other potentially messy materials. Its ability to resist oil and grease makes it an ideal choice for these purposes, ensuring that the workspace remains clean and organized.
5. Important Note on Baking
It's crucial to note that greaseproof paper should not be used for baking or high-temperature applications. The paper is not heat-resistant and may become brittle or even catch fire if exposed to high temperatures. Therefore, it is not suitable for lining baking trays or oven dishes. Instead, parchment paper or silicone baking mats should be used for these purposes, as they are heat-resistant and can withstand high temperatures without compromising their integrity.
6. Availability and Sustainability
Greaseproof paper is widely accessible in most grocery stores, supermarkets, and online retail platforms. It is generally sold in rolls or sheets, making it easy to store and use as needed. Additionally, with the rise of eco-conscious consumers, many manufacturers are now offering biodegradable and compostable versions of greaseproof paper, making it a more sustainable choice for the environmentally aware consumer.
In conclusion, greaseproof paper is a versatile and indispensable tool in food packaging and handling. Its ability to resist oil and grease, coupled with its various grease resistance levels (Kit1-Kit7), makes it an excellent choice for wrapping food items and other non-culinary applications. However, it's important to remember that greaseproof paper is not suitable for baking or high-temperature applications due to its lack of heat resistance. So, the next time you're in the kitchen or preparing food for packaging, make sure to choose the right type of paper for your needs to ensure optimal performance and safety.