Workers in this unit group prepare pulp for making paper. Their functions include: operating grinding machines to reduce logs to pulp; operating chipper machines to reduce logs to chips for making pulp; operating digesters to produce pulp from materials such as wood, rags, esparto, straw or waste paper; operating machines to bleach wood pulp, rags, esparto, straw or waste-paper pulp; operating machines which mix, beat and hydrate pulp and other ingredients to prepare stuff for making paper; performing related tasks.