It is ideal to use a teflon sheet when pressing your designs as it prevents the upper heat platen clean and to prevent colors from bleeding through. The Teflon sheets are re-usable and last a long time.Prevents ink from staining the heat platen and eliminates scorching  products, keeps transfers from sticking to the platen .Can help to prevent ghosting effect often created by transfer papers sliding across the garment while the lifting the platen. Use an additional sheet under garments when using dye sublimation to prevent sublimation inks from penetrating the rubber lower patten cover.