The production of paper begins by breaking down logs into small pieces that are then placed into a boiler. The wood is boiled for several hours to produce a thick black liquid called black liquor. This liquid is high in ammonia and other chemicals, which are used in the next step of the process. The black liquor is then pumped into a large container called a digester, where it is mixed with chemicals and steam. The mixture is cooked under pressure for several hours to produce a thick pulp. The pulp is then washed and sent to a machine that removes any remaining water. The pulp is then fed through a series of rollers that press it into thin sheets. These sheets are then dried and wound into rolls. The finished product is then cut to size and shipped to customers.