|
Context: |
|
The advantages of soft nip calendering and supercalendering over hard nip calendering with respect to strength and surface characteristics were explained in Section 12.3. A negative aspect is that opacity and brightness decrease as a result of the heavier calendering and greater sheet densification achieved with soft nips (including supercalenders). Drops of 1 to 2% points for uncoated and lightly coated papers, and drops of 0.5 to 1.0% points for medium coated grades are typical over the common ranges of finishing conditions. |
|