Woodfree uncoated paper

Woodfree uncoated paper (WFU) or uncoated fine papers are containing mainly chemical pulps and 5–25% fillers.^[1] Both softwood and hardwood chemical pulps are used and a minor part of mechanical pulp might be added (often of aspen or poplar). These paper grades are calendered.

Properties

Woodfree uncoated papers are of high quality and have a natural look and feel. The properties are good strength, high brightness and good archival characteristics.^[2] They provide a non-glare surface suitable for reading and writing.

Special types

Offset paper is a WFU paper with ISO brightness > 80% and a basis weight of 40–300 g/m². Surface strength and low linting are the main parameters, but brightness and opacity are also important.

Lightweight offset paper have basis weight of 25–40 g/m² and are normally used for bibles and dictionaries.

References

1. ^ The paper made without using mechanical pulp
2. ^ Paulapuro, Hannu (2000) "1" Paper and Board grades Papermaking Science and Technology 18 Finland: Fapet Oy pp. 35–37 ISBN 952-5216-18-7