Grease Proof Paper Bags Brown Takeaway Bags

Grease Proof paper is paper that is impermeable to oil or grease and is normally used in cooking or food packaging. Normally grease proof paper is produced by refining the paper stock and thus create a sheet with very low porosity. This sheet is supercalendered to further improve the density, creating a paper called glassine. The glassine is treated with starches, alginates or CMC in a size press to fill pores or treat the paper chemically to make it fat repellent.

Glassine is a smooth and glossy paper that is air, water and grease resistant. It is usually available in densities between 50–90 g/m². It is translucent unless dyes are added to color it or make it opaque. It is manufactured by supercalendering: after pressing and drying, the paper web is passed through a stack of alternating steel and fiber-covered rolls called a supercalender at the end of the paper machine such that the paper fibers flatten facing in the same direction.